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As filed with the Securities and Exchange Commission on June 7, 2013

1933 Act File No. 333-181879

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-2

REGISTRATION STATEMENT

UNDER

GLADSTONE INVESTMENT CORPORATION

(Exact name of registrant as specified in charter)

1521 Westbranch Drive, Suite 200

McLean, VA 22102

(Address of principal executive offices)

Registrant’s telephone number, including area code: (703) 287-5800

David Gladstone

Chairman and Chief Executive Officer

Gladstone Investment Corporation

1521 Westbranch Drive, Suite 200

McLean, Virginia 22102

(Name and address of agent for service)

COPIES TO:

Helen W. Brown

Bass, Berry & Sims PLC

100 Peabody Place, Suite 900

Memphis, TN 38103

Tel: (901) 543-5918

Fax: 888-789-4123

Approximate date of proposed public offering: From time to time after the effective date of this registration statement.

If any securities being registered on this form will be offered on a delayed or continuous basis in reliance on Rule 415 under the Securities Act of 1933, as amended, other than securities offered in connection with a dividend reinvestment plan, check the following box.   x

It is proposed that this filing will become effective (check appropriate box)

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until this Registration Statement shall become effective on such date as the Commission, acting pursuant to Section 8(a), may determine.

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The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED JUNE 7, 2013

PROSPECTUS

$300,000,000

COMMON STOCK

PREFERRED STOCK

SUBSCRIPTION RIGHTS

WARRANTS

DEBT SECURITIES

We may offer, from time to time, up to $300,000,000 aggregate initial offering price of our common stock, $0.001 par value per share, preferred stock, $0.001 par value per share, subscription rights, warrants representing rights to purchase shares of our common stock, or debt securities, or a combined offering of these securities, which we refer to in this prospectus collectively as our Securities, in one or more offerings. The Securities may be offered at prices and on terms to be disclosed in one or more supplements to this prospectus. In the case of our common stock and warrants or rights to acquire such common stock hereunder, the offering price per share of our common stock by us, less any underwriting commissions or discounts, will not be less than the net asset value per share of our common stock at the time of the offering except (i) in connection with a rights offering to our existing stockholders, (ii) with the consent of the holders of the majority of our outstanding stock, or (iii) under such other circumstances as the U.S. Securities and Exchange Commission (“SEC”) may permit. You should read this prospectus and the applicable prospectus supplement carefully before you invest in our Securities.

We operate as a closed-end, non-diversified management investment company and have elected to be treated as a business development company under the Investment Company Act of 1940, as amended. For federal income tax purposes, we have elected to be treated as a regulated investment company under Subchapter M of the Internal Revenue Code of 1986, as amended. Our investment objectives are to: (1) achieve and grow current income by investing in debt securities of established businesses that we believe will provide stable earnings and cash flow to pay expenses, make principal and interest payments on our outstanding indebtedness and make distributions to stockholders that grow over time; and (2) provide our stockholders with long-term capital appreciation in the value of our assets by investing in equity securities of established businesses that we believe can grow over time to permit us to sell our equity investments for capital gains.

Our Securities may be offered directly to one or more purchasers, including existing stockholders in a rights offering, through agents designated from time to time by us, or to or through underwriters or dealers. The prospectus supplement relating to the offering will identify any agents or underwriters involved in the sale of our Securities, and will disclose any applicable purchase price, fee, commission or discount arrangement between us and our agents or underwriters or among our underwriters or the basis upon which such amount may be calculated. See “Plan of Distribution.” We may not sell any of our Securities through agents, underwriters or dealers without delivery of a prospectus supplement describing the method and terms of the offering of such Securities. Our common stock is traded on The NASDAQ Global Select Market (“NASDAQ”) under the symbol “GAIN.” As of June 5, 2013, the last reported sales price of our common stock was $7.32 and the net asset value per share of our common stock on March 31, 2013 (the last date prior to the date of this prospectus on which we determined our net asset value per share) was $9.10. Our 7.125% Series A Cumulative Term Preferred Stock is traded on NASDAQ under the symbol “GAINP.” As of June 5, 2013, the last reported sales price of our 7.125% Series A Cumulative Term Preferred Stock was $26.21.

This prospectus contains information you should know before investing, including information about risks. Please read it before you invest and keep it for future reference. Additional information about us, including our annual, quarterly and current reports, has been filed with the SEC. This information is available free of charge by calling us collect at (703) 287-5893 or on our corporate website located at http://www.gladstoneinvestment.com . See “Additional Information.” Information contained on our website is not incorporated by reference into this prospectus, and you should not consider that information to be part of this prospectus. The Securities and Exchange Commission also maintains a website at www.sec.gov that contains such information. This prospectus may not be used to consummate sales of securities unless accompanied by a prospectus supplement.

An investment in our Securities involves certain risks, including, among other things, risks relating to investments in securities of small, private and developing businesses. We describe some of these risks in the section entitled “ Risk Factors ,” which begins on page 9. Common shares of closed-end investment companies frequently trade at a discount to their net asset value per share and this may increase the risk of loss of purchasers of our Securities. You should carefully consider these risks together with all of the other information contained in this prospectus and any prospectus supplement before making a decision to purchase our Securities.

The Securities being offered have not been approved or disapproved by the Securities and Exchange Commission or any state securities commission nor has the Securities and Exchange Commission or any state securities commission passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.

                    , 2013

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We have not authorized any dealer, salesman or other person to give any information or to make any representation other than those contained in this prospectus or any accompanying supplement to this prospectus. You must not rely upon any information or representation not contained in this prospectus or the accompanying prospectus supplement as if we had authorized it. This prospectus and any prospectus supplement do not constitute an offer to sell or a solicitation of any offer to buy any security other than the registered securities to which they relate, nor do they constitute an offer to sell or a solicitation of an offer to buy any securities in any jurisdiction to any person to whom it is unlawful to make such an offer or solicitation in such jurisdiction. The information contained in this prospectus and any prospectus supplement is accurate as of the dates on their respective covers only. Our business, financial condition, results of operations and prospects may have changed since such dates.

This prospectus is part of a registration statement that we have filed with the Securities and Exchange Commission, or SEC, using the “shelf” registration process. Under the shelf registration process, we may offer, from time to time, up to $300,000,000 of our Securities on terms to be determined at the time of the offering. This prospectus provides you with a general description of the Securities that we may offer. Each time we use this prospectus to offer Securities, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. To the extent required by law, we will amend or supplement the information contained in this prospectus and any accompanying prospectus supplement to reflect any material changes to such information subsequent to the date of the prospectus and any accompanying prospectus supplement and prior to the completion of any offering pursuant to the prospectus and any accompanying prospectus supplement. Please carefully read this prospectus and any accompanying prospectus supplement together with the additional information described under “Available Information” and “Risk Factors” before you make an investment decision.

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RISK FACTORS

You should carefully consider the risks described below and all other information provided in this prospectus (or any prospectus supplement) before making a decision to purchase our Securities. The risks and uncertainties described below are not the only ones facing us. Additional risks and uncertainties not presently known to us, or not presently deemed material by us, may also impair our operations and performance.

If any of the following risks actually occur, our business, financial condition or results of operations could be materially adversely affected. If that happens, the trading price of our Securities could decline, and you may lose all or part of your investment.

Risks Related to the Economy

The uncertainty surrounding the strength of the U.S. economic recovery and the capital markets volatility in general increases the possibility of adverse effects on our financial position and results of operations. Continued economic adversity could impair our portfolio companies’ financial positions and operating results, affect the industries in which we invest, and reduce our volume of new investment activity, thereby harming our operating results. Continued adversity in the capital markets could impact our ability to raise capital and reduce our volume of new investments.

The U.S. is continuing to recover from the recession that largely began in late 2007. While economic conditions generally appear to be improving, we remain cautious about a long-term economic recovery. The recession in general, and the disruptions in the capital markets in particular, have impacted our liquidity options and increased our cost of debt and equity capital. As a result, we do not know if adverse conditions will again intensify, and we are unable to gauge the full extent to which the disruptions will continue to affect us. The longer these uncertain conditions persist, the greater the probability that these factors could continue to increase our costs of, and significantly limit our access to, debt and equity capital and, thus, have an adverse effect on our operations and financial results. Many of our portfolio companies and the companies we may invest in prospectively are also susceptible to these unstable economic conditions, which may affect the ability of one or more of our portfolio companies to repay our loans or engage in a liquidity event, such as a sale, recapitalization or initial public offering. These unstable economic conditions could also disproportionately impact some of the industries in which we invest, causing us to be more vulnerable to losses in our portfolio, which could cause the number of non-performing assets to increase and the fair value of our portfolio to decrease. The unstable economic conditions may also decrease the value of collateral securing some of our loans as well as the value of our equity investments, which would decrease our ability to borrow under our Credit Facility or raise equity capital, thereby further reducing our ability to make new investments.

The unstable economic conditions have affected the availability of credit generally. Our current credit facility limits our distributions to stockholders and, as a result, we decreased our monthly cash distribution rate by 50%, starting in April 2009, in an effort to more closely align our distributions to our net investment income, though we subsequently increased our distributions by 25% during the 2012 fiscal year and maintained that level of distributions through the 2013 fiscal year. We do not know when market conditions will stabilize, if adverse conditions will intensify or the full extent to which the disruptions will continue to affect us. Also, it is possible that persistent instability of the financial markets could have other unforeseen material effects on our business.

The downgrade of the United States credit rating and the ongoing economic crisis in Europe could negatively impact our liquidity, financial condition and earnings.

Recent U.S. debt ceiling and budget deficit concerns, together with signs of deteriorating sovereign debt conditions in Europe, have increased the possibility of additional credit-rating downgrades and economic slowdowns. Although U.S. lawmakers passed legislation to raise the federal debt ceiling, Standard & Poor’s Ratings Services lowered its long-term sovereign credit rating on the U.S. from “AAA” to “AA+” in August 2011. The impact of this or any further downgrades to the U.S. government’s sovereign credit rating, or its perceived creditworthiness, and the impact of the current crisis in Europe with respect to the ability of certain European Union countries to continue to service their sovereign debt obligations is inherently unpredictable and could adversely affect the U.S. and global financial markets and economic conditions. There can be no assurance that governmental or other measures to aid economic recovery will be effective. These fairly recent developments, and the government’s credit concerns in general, could cause interest rates and borrowing costs to rise, which may negatively impact our ability to access the debt markets on favorable terms. Continued adverse economic conditions could have a material adverse effect on our business, financial condition and results of operations.

We may experience fluctuations in our quarterly and annual results based on the impact of inflation in the United States.

The majority of our portfolio companies are in industries that are directly impacted by inflation, such as consumer goods and services and manufacturing. Our portfolio companies may not be able to pass on to customers increases in their costs of operations, which could greatly affect their operating results, impacting their ability to repay our loans. In addition, any projected future decreases in our portfolio companies’ operating results due to inflation could adversely impact the fair value of those investments. Any decreases in the fair value of our investments could result in future unrealized losses and therefore reduce our net assets resulting from operations.

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Risks Related to Our External Management

We are dependent upon our key management personnel and the key management personnel of the Adviser, particularly David Gladstone, Terry Lee Brubaker and David Dullum, and on the continued operations of the Adviser, for our future success.

We have no employees. Our chief executive officer, president, chief operating officer, chief financial officer and treasurer, and the employees of the Adviser, do not spend all of their time managing our activities and our investment portfolio. We are particularly dependent upon David Gladstone, Terry Lee Brubaker and David Dullum in this regard. Our executive officers and the employees of the Adviser allocate some, and in some cases a material portion, of their time to businesses and activities that are not related to our business. We have no separate facilities and are completely reliant on the Adviser, which has significant discretion as to the implementation and execution of our business strategies and risk management practices. We are subject to the risk of discontinuation of the Adviser’s operations or termination of the Advisory Agreement and the risk that, upon such event, no suitable replacement will be found. We believe that our success depends to a significant extent upon the Adviser and that discontinuation of its operations could have a material adverse effect on our ability to achieve our investment objectives.

The Adviser can resign on 60 days’ notice, and we may not be able to find a suitable replacement within that time, resulting in a disruption in our operations that could adversely affect our financial condition, business and results of operations.

The Adviser has the right to resign under the Advisory Agreement at any time upon not less than 60 days’ written notice, whether we have found a replacement or not. If the Adviser resigns, we may not be able to find a new investment adviser or hire internal management with similar expertise and ability to provide the same or equivalent services on acceptable terms within 60 days, or at all. If we are unable to do so quickly, our operations are likely to experience a disruption, our financial condition, business and results of operations as well as our ability to pay distributions are likely to be adversely affected and the market price of our shares may decline. In addition, the coordination of our internal management and investment activities is likely to suffer if we are unable to identify and reach an agreement with a single institution or group of executives having the expertise possessed by the Adviser and its affiliates. Even if we are able to retain comparable management, whether internal or external, the integration of such management and their lack of familiarity with our investment objective may result in additional costs and time delays that may adversely affect our business, financial condition, results of operations and cash flows.

Our incentive fee may induce the Adviser to make certain investments, including speculative investments.

The management compensation structure that has been implemented under the Advisory Agreement may cause the Adviser to invest in high-risk investments or take other risks. In addition to its management fee, the Adviser is entitled under the Advisory Agreement to receive incentive compensation based in part upon our achievement of specified levels of income. In evaluating investments and other management strategies, the opportunity to earn incentive compensation based on net income may lead the Adviser to place undue emphasis on the maximization of net income at the expense of other criteria, such as preservation of capital, maintaining sufficient liquidity, or management of credit risk or market risk, in order to achieve higher incentive compensation. Investments with higher yield potential are generally riskier or more speculative. This could result in increased risk to the value of our investment portfolio.

We may be obligated to pay the Adviser incentive compensation even if we incur a loss.

The Advisory Agreement entitles the Adviser to incentive compensation for each fiscal quarter in an amount equal to a percentage of the excess of our investment income for that quarter (before deducting incentive compensation, net operating losses and certain other items) above a threshold return for that quarter. When calculating our incentive compensation, our pre-incentive fee net investment income excludes realized and unrealized capital losses that we may incur in the fiscal quarter, even if such capital losses result in a net loss on our statement of operations for that quarter. Thus, we may be required to pay the Adviser incentive compensation for a fiscal quarter even if there is a decline in the value of our portfolio or we incur a net loss for that quarter. For additional information on incentive compensation under the Advisory Agreement with the Adviser, see “ Business — Ongoing Management of Investments and Portfolio Company Relationships — Investment Advisory and Management Agreement. ”

We may be required to pay the Adviser incentive compensation on income accrued, but not yet received in cash.

That part of the incentive fee payable by us that relates to our net investment income is computed and paid on income that may include interest that has been accrued but not yet received in cash, such as debt instruments with PIK interest. If a portfolio company defaults on a loan, it is possible that such accrued interest previously used in the calculation of the incentive fee will become uncollectible. Consequently, we may make incentive fee payments on income accruals that we may not collect in the future and with respect to which we do not have a clawback right against the Adviser.

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The Adviser’s failure to identify and invest in securities that meet our investment criteria or perform its responsibilities under the Advisory Agreement may adversely affect our ability for future growth.

Our ability to achieve our investment objectives will depend on our ability to grow, which in turn will depend on the Adviser’s ability to identify and invest in securities that meet our investment criteria. Accomplishing this result on a cost-effective basis will be largely a function of the Adviser’s structuring of the investment process, its ability to provide competent and efficient services to us, and our access to financing on acceptable terms. The senior management team of the Adviser has substantial responsibilities under the Advisory Agreement. In order to grow, the Adviser will need to hire, train, supervise, and manage new employees successfully. Any failure to manage our future growth effectively could have a material adverse effect on our business, financial condition, and results of operations.

There are significant potential conflicts of interest which could impact our investments and investment returns.

Our executive officers and directors, and the officers and directors of the Adviser, serve or may serve as officers, directors, or principals of entities that operate in the same or a related line of business as we do or of investment funds managed by our affiliates. Accordingly, they may have obligations to investors in those entities, the fulfillment of which might not be in the best interests of us or our stockholders. For example, Mr. Gladstone, our chairman and chief executive officer, is the chairman of the board and chief executive officer of the Adviser, Gladstone Investment, Gladstone Commercial and Gladstone Land. In addition, Mr. Brubaker, our vice chairman, chief operating officer, assistant secretary and a director, is the vice chairman, chief operating officer, assistant secretary and a director of the Adviser, Gladstone Capital, Gladstone Commercial and Gladstone Land. Mr. Dullum, our president and a director, is a director of Gladstone Capital and Gladstone Commercial. Moreover, the Adviser may establish or sponsor other investment vehicles which from time to time may have potentially overlapping investment objectives with ours and accordingly may invest in, whether principally or secondarily, asset classes we target. While the Adviser generally has broad authority to make investments on behalf of the investment vehicles that it advises, the Adviser has adopted investment allocation procedures to address these potential conflicts and intends to direct investment opportunities to the Gladstone affiliate with the investment strategy that most closely fits the investment opportunity. Nevertheless, the management of the Adviser may face conflicts in the allocation of investment opportunities to other entities managed by the Adviser. As a result, it is possible that we may not be given the opportunity to participate in certain investments made by other funds managed by the Adviser. Our Board of Directors approved a revision of our investment objectives and strategies that became effective on January 1, 2013, which may enhance the potential for conflicts in the allocation of investment opportunities to us and other entities managed by the Adviser.

In certain circumstances, we may make investments in a portfolio company in which one of our affiliates has or will have an investment, subject to satisfaction of any regulatory restrictions and, where required, the prior approval of our Board of Directors. As of March 31, 2013, our Board of Directors has approved the following types of co-investment transactions:

Certain of our officers, who are also officers of the Adviser, may from time to time serve as directors of certain of our portfolio companies. If an officer serves in such capacity with one of our portfolio companies, such officer will owe fiduciary duties to all stockholders of the portfolio company, which duties may from time to time conflict with the interests of our stockholders.

In the course of our investing activities, we will pay management and incentive fees to the Adviser and will reimburse the Administrator for certain expenses it incurs. As a result, investors in our common stock will invest on a “gross” basis and receive

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distributions on a “net” basis after expenses, resulting in, among other things, a lower rate of return than one might achieve through our investors themselves making direct investments. As a result of this arrangement, there may be times when the management team of the Adviser has interests that differ from those of our stockholders, giving rise to a conflict. In addition, as a BDC, we make available significant managerial assistance to our portfolio companies and provide other services to such portfolio companies. Although, neither we nor the Adviser currently receives fees in connection with managerial assistance, the Adviser and Gladstone Securities have, at various times, provided other services to certain of our portfolio companies and received fees for these other services.

The Adviser is not obligated to provide a waiver of the base management fee, which could negatively impact our earnings and our ability to maintain our current level of distributions to our stockholders.

The Advisory Agreement provides for a base management fee based on our gross assets. Since our 2008 fiscal year, our Board of Directors has accepted on a quarterly basis voluntary, unconditional and irrevocable waivers to reduce the annual 2.0% base management fee on senior syndicated loan participations to 0.5% to the extent that proceeds resulting from borrowings were used to purchase such syndicated loan participations, and any waived fees may not be recouped by the Adviser in the future. However, the Adviser is not required to issue these or other waivers of fees under the Advisory Agreement, and to the extent our investment portfolio grows in the future, we expect these fees will increase. If the Adviser does not issue these waivers in future quarters, it could negatively impact our earnings and may compromise our ability to maintain our current level of distributions to our stockholders, which could have a material adverse impact on our stock price.

Our business model is dependent upon developing and sustaining strong referral relationships with investment bankers, business brokers and other intermediaries and any change in our referral relationships may impact our business plan.

We are dependent upon informal relationships with investment bankers, business brokers and traditional lending institutions to provide us with deal flow. If we fail to maintain our relationship with such funds or institutions, or if we fail to establish strong referral relationships with other funds, we will not be able to grow our portfolio of investments and fully execute our business plan.

Our base management fee may induce our Adviser to incur leverage.

The fact that our base management fee is payable based upon our gross assets, which would include any investments made with proceeds of borrowings, may encourage our Adviser to use leverage to make additional investments. Under certain circumstances, the use of increased leverage may increase the likelihood of default, which would disfavor holders of our securities. Given the subjective nature of the investment decisions made by our Adviser on our behalf, we will not be able to monitor this potential conflict of interest.

Risks Related to Our External Financing

In addition to regulatory limitations on our ability to raise capital, our credit facility contains various covenants which, if not complied with, could accelerate our repayment obligations under the facility, thereby materially and adversely affecting our liquidity, financial condition, results of operations and ability to pay distributions.

We will have a continuing need for capital to finance our investments. As of March 31, 2013, we had $31.0 million in borrowings outstanding under our fourth amended and restated credit agreement, which provided for maximum borrowings of $60.0 million. On April 30, 2013, we, through our wholly owned subsidiary Gladstone Business Investment, LLC (“Business Investment”) entered into a fifth amended and restated credit agreement, which replaced the prior revolving line of credit, and increased the net commitment amount to $70.0 million and extended the maturity date approximately six months to April 30, 2016 (the “Credit Facility”). Our Credit Facility permits us to fund additional loans and investments as long as we are within the conditions set forth in the credit agreement. Our Credit Facility contains covenants that require Business Investment to maintain its status as a separate legal entity, prohibit certain significant corporate transactions (such as mergers, consolidations, liquidations or dissolutions) and restrict material changes to our credit and collection policies without lenders’ consent. The facility also limits payments as distributions to the aggregate net investment income for each of the twelve month periods ending March 31, 2014, 2015, 2016 and 2017. We are also subject to certain limitations on the type of loan investments we can make, including restrictions on geographic concentrations, sector concentrations, loan size, dividend payout, payment frequency and status, average life and lien property. The Credit Facility also requires us to comply with other financial and operational covenants, which obligate us to, among other things, maintain certain financial ratios, including asset and interest coverage, a minimum net worth and a minimum number of obligors required in the borrowing base of the credit agreement. Additionally, we are subject to a performance guaranty that requires us to maintain (i) a minimum net worth of $170.0 million plus 50% of all equity and subordinated debt raised after April 30, 2013, (ii) “asset coverage” with respect to “senior securities representing indebtedness” of at least 200%, in accordance with Section 18 of the 1940 Act and (iii) our status as a BDC under the 1940 Act and as a RIC under the Code. As of March 31, 2013, we were in compliance with the covenants under the fourth amended and restated credit agreement, and as of May 15, 2013, we were in compliance with the covenants under the Credit Facility; however, our continued compliance depends on many factors, some of which are beyond our control.

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Given the continued uncertainty in the capital markets, the cumulative unrealized depreciation in our portfolio may increase in future periods and threaten our ability to comply with the minimum net worth covenant and other covenants under our Credit Facility. Because of changes in our asset portfolio, in part due to significant sales of Non-Control/Non-Affiliate investments during fiscal year 2010, there is a significant possibility that we may not meet the asset diversification threshold under the Code’s rules applicable to a RIC at each of our future quarterly testing dates. In addition, our REIT status could be jeopardized if we make any new investments, including additional investments in our portfolio companies (such as advances under our outstanding lines of credit). For more information on our current RIC status, see “Material U.S. Federal Income Tax Considerations — RIC Status.” Our failure to satisfy applicable loan covenants could result in foreclosure by our lenders, which would accelerate our repayment obligations under the facility and thereby have a material adverse effect on our business, liquidity, financial condition, results of operations and ability to pay distributions to our stockholders.

Any inability to renew, extend or replace our Credit Facility on terms favorable to us, or at all, could adversely impact our liquidity and ability to fund new investments or maintain distributions to our stockholders.

The maturity date of our Credit Facility is April 30, 2016 (the “Maturity Date”) and, if not renewed or extended by the Maturity Date, all principal and interest will be due and payable on or before April 30, 2017 (one year after the Maturity Date). Subject to certain terms and conditions, the Credit Facility may be expanded to a total of $200 million through the addition of other lenders to the facility. However, if additional lenders are unwilling to join the facility on its terms, we will be unable to expand the facility and thus will continue to have limited availability to finance new investments under our Credit Facility. There can be no guarantee that we will be able to renew, extend or replace the Credit Facility upon its maturity in 2016 on terms that are favorable to us, if at all. Our ability to expand the Credit Facility, and to obtain replacement financing at the time of its maturity, will be constrained by then-current economic conditions affecting the credit markets. In the event that we are not able to expand the Credit Facility, or to renew, extend or refinance the Credit Facility at the time of its maturity, this could have a material adverse effect on our liquidity and ability to fund new investments, our ability to make distributions to our stockholders and our ability to qualify as a RIC under the Code.

If we are unable to secure replacement financing, we may be forced to sell certain assets on disadvantageous terms, which may result in realized losses, and such realized losses could materially exceed the amount of any unrealized depreciation on these assets as of our most recent balance sheet date, which would have a material adverse effect on our results of operations. In addition to selling assets, or as an alternative, we may issue equity in order to repay amounts outstanding under the Credit Facility. Based on the recent trading prices of our stock, such an equity offering may have a substantial dilutive impact on our existing stockholders’ interest in our earnings, assets and voting interest in us. If we are able to renew, extend or refinance our Credit Facility prior to maturity, any renewal, extension or refinancing of the Credit Facility will potentially result in significantly higher interest rates and related charges and may impose significant restrictions on the use of borrowed funds to fund investments or maintain distributions to stockholders.

Our business plan is dependent upon external financing, which is constrained by the limitations of the 1940 Act.

Although we completed an offering of our Term Preferred Stock in March 2012 and a common offering in October 2012, there can be no assurance that we will be able to raise capital through issuing equity in the near future. Our business requires a substantial amount of cash to operate and grow. We may acquire such additional capital from the following sources:

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We financed certain of our investments with borrowed money and capital from the issuance of Senior Securities, which will magnify the potential for gain or loss on amounts invested and may increase the risk of investing in us.

The following table illustrates the effect of leverage on returns from an investment in our common stock assuming various annual returns on our portfolio, net of expenses. The calculations in the table below are hypothetical, and actual returns may be higher or lower than those appearing in the table below.

Based on an aggregate outstanding indebtedness of $36.0 million at cost, excluding the short-term loan, as of March 31, 2013, the effective annual interest rate of 4.3% as of that date, and aggregate liquidation preference of our Term Preferred Stock of $40.0 million, our investment portfolio at fair value would have had to produce an annual return of at least 1.40% to cover annual interest payments on the outstanding debt and dividends on our Term Preferred Stock.

A change in interest rates may adversely affect our profitability and our hedging strategy may expose us to additional risks.

We anticipate using a combination of equity and long-term and short-term borrowings to finance our investment activities. As a result, a portion of our income will depend upon the difference between the rate at which we borrow funds and the rate at which we loan these funds. Higher interest rates on our borrowings will decrease the overall return on our portfolio.

Ultimately, we expect approximately 80% of the loans in our portfolio to be at variable rates determined on the basis of a LIBOR rate and approximately 20% to be at fixed rates. As of March 31, 2013, based on the total principal balance of debt outstanding, our portfolio consisted of approximately 80.1% of loans at variable rates with floors and 19.9% at fixed rates.

We currently hold one interest rate cap agreement. While hedging activities may insulate us against adverse fluctuations in interest rates, they may also limit our ability to participate in the benefits of lower interest rates with respect to the hedged portfolio. Adverse developments resulting from changes in interest rates or any future hedging transactions could have a material adverse effect on our business, financial condition and results of operations. Our ability to receive payments pursuant to an interest rate cap agreement is

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linked to the ability of the counter-party to that agreement to make the required payments. To the extent that the counter-party to the agreement is unable to pay pursuant to the terms of the agreement, we may lose the hedging protection of the interest rate cap agreement.

Risks Related to Our Investments

We operate in a highly competitive market for investment opportunities.

A large number of entities compete with us and make the types of investments that we seek to make in small and mid-sized companies. We compete with public and private buyout funds, commercial and investment banks, commercial financing companies, and, to the extent that they provide an alternative form of financing, hedge funds. Many of our competitors are substantially larger and have considerably greater financial, technical and marketing resources than we do. For example, some competitors may have a lower cost of funds and access to funding sources that are not available to us. In addition, some of our competitors may have higher risk tolerances or different risk assessments, which would allow them to consider a wider variety of investments and establish more relationships than us. Furthermore, many of our competitors are not subject to the regulatory restrictions that the 1940 Act imposes on us as a BDC. The competitive pressures we face could have a material adverse effect on our business, financial condition and results of operations. Also, as a result of this competition, we may not be able to take advantage of attractive investment opportunities from time to time and we can offer no assurance that we will be able to identify and make investments that are consistent with our investment objective. We do not seek to compete based on the interest rates we offer, and we believe that some of our competitors may make loans with interest rates that will be comparable to or lower than the rates we offer. We may lose investment opportunities if we do not match our competitors’ pricing, terms, and structure. However, if we match our competitors’ pricing, terms, and structure, we may experience decreased net interest income and increased risk of credit loss.

Our investments in small and medium-sized portfolio companies are extremely risky and could cause you to lose all or a part of your investment.

Investments in small and medium-sized portfolio companies are subject to a number of significant risks including the following:

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Because the loans we make and equity securities we receive when we make loans are not publicly traded, there is uncertainty regarding the value of our privately held securities that could adversely affect our determination of our NAV.

Our portfolio investments are, and we expect will continue to be, in the form of securities that are not publicly traded. The fair value of securities and other investments that are not publicly traded may not be readily determinable. Our Board of Directors has established an investment valuation policy and consistently applied valuation procedures used to determine the fair value of these securities quarterly. These procedures for the determination of value of many of our debt securities rely on the opinions of value submitted to us by SPSE or the use of internally developed discounted cash flow (“DCF”) methodologies or indicative bid prices (“IBP”) offered by the respective originating syndication agent’s trading desk, or secondary desk, specifically for our syndicated loans, or internal methodologies based on the total enterprise value (“TEV”) of the issuer used for certain of our equity investments. SPSE will only evaluate the debt portion of our investments for which we specifically request evaluation, and SPSE may decline to make requested evaluations for any reason in its sole discretion. However, to date, SPSE has accepted each of our requests for evaluation.

Our use of these fair value methods is inherently subjective and is based on estimates and assumptions of each security. In the event that we are required to sell a security, we may ultimately sell for an amount materially less than the estimated fair value calculated by SPSE, or utilizing the TEV, IBP or the DCF methodology.

Our procedures also include provisions whereby the Adviser will establish the fair value of any equity securities we may hold where SPSE or third-party agent banks are unable to provide evaluations. The types of factors that may be considered in determining the fair value of our debt and equity securities include some or all of the following:

Because such valuations, particularly valuations of private securities and private companies, are not susceptible to precise determination, may fluctuate over short periods of time, and may be based on estimates, our determinations of fair value may differ from the values that might have actually resulted had a readily available market for these securities been available.

A portion of our assets are, and will continue to be, comprised of equity securities that are valued based on internal assessment using our own valuation methods approved by our Board of Directors, without the input of SPSE or any other third-party evaluator. We believe that our equity valuation methods reflect those regularly used as standards by other professionals in our industry who value equity securities. However, determination of fair value for securities that are not publicly traded, whether or not we use the recommendations of an independent third-party evaluator, necessarily involves the exercise of subjective judgment. Our NAV could be adversely affected if our determinations regarding the fair value of our investments were materially higher than the values that we ultimately realize upon the disposal of such securities.

The lack of liquidity of our privately held investments may adversely affect our business.

We will generally make investments in private companies whose securities are not traded in any public market. Substantially all of the investments we presently hold and the investments we expect to acquire in the future are, and will be, subject to legal and other restrictions on resale and will otherwise be less liquid than publicly-traded securities. The illiquidity of our investments may make it

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difficult for us to quickly obtain cash equal to the value at which we record our investments if the need arises. This could cause us to miss important investment opportunities. In addition, if we are required to liquidate all or a portion of our portfolio quickly, we may record substantial realized losses upon liquidation. We may also face other restrictions on our ability to liquidate an investment in a portfolio company to the extent that we, the Adviser, or our respective officers, employees or affiliates have material non-public information regarding such portfolio company.

Due to the uncertainty inherent in valuing these securities, our determinations of fair value may differ materially from the values that could be obtained if a ready market for these securities existed. Our NAV could be materially affected if our determinations regarding the fair value of our investments are materially different from the values that we ultimately realize upon our disposal of such securities.

Our financial results could be negatively affected if a significant portfolio investment fails to perform as expected.

Our total investment in companies may be significant individually or in the aggregate. As a result, if a significant investment in one or more companies fails to perform as expected, our financial results could be more negatively affected and the magnitude of the loss could be more significant than if we had made smaller investments in more companies. Our five largest investments represented 50.2% of the fair value of our total portfolio as of March 31, 2013, compared to 52.9% as of March 31, 2012. Any disposition of a significant investment in one or more companies may negatively impact our net investment income and limit our ability to pay distributions.

When we are a debt or minority equity investor in a portfolio company, we may not be in a position to control the entity, and its management may make decisions that could decrease the value of our investment.

We anticipate that some of our investments will continue to be either debt or minority equity investments in our portfolio companies. Therefore, we are and will remain subject to risk that a portfolio company may make business decisions with which we disagree, and the shareholders and management of such company may take risks or otherwise act in ways that do not serve our best interests. As a result, a portfolio company may make decisions that could decrease the value of our portfolio holdings. In addition, we will generally not be in a position to control any portfolio company by investing in its debt securities.

We typically invest in transactions involving acquisitions, buyouts and recapitalizations of companies, which will subject us to the risks associated with change in control transactions.

Our strategy, in part, includes making debt and equity investments in companies in connection with acquisitions, buyouts and recapitalizations, which subjects us to the risks associated with change in control transactions. Change in control transactions often present a number of uncertainties. Companies undergoing change in control transactions often face challenges retaining key employees and maintaining relationships with customers and suppliers. While we hope to avoid many of these difficulties by participating in transactions where the management team is retained and by conducting thorough due diligence in advance of our decision to invest, if our portfolio companies experience one or more of these problems, we may not realize the value that we expect in connection with our investments, which would likely harm our operating results and financial condition.

Our portfolio companies may incur debt that ranks equally with, or senior to, our investments in such companies.

We invest in debt securities issued by our portfolio companies. In some cases portfolio companies will be permitted to have other debt that ranks equally with, or senior to, the debt securities in which we invest. By their terms, such debt instruments may provide that the holders thereof are entitled to receive payment of interest and principal on or before the dates on which we are entitled to receive payments in respect of the debt securities in which we invest. Also, in the event of insolvency, liquidation, dissolution, reorganization, or bankruptcy of a portfolio company, holders of debt instruments ranking senior to our investment in that portfolio company would typically be entitled to receive payment in full before we receive any distribution in respect of our investment. After repaying such senior creditors, such portfolio company may not have any remaining assets to use for repaying its obligation to us. In the case of debt ranking equally with debt securities in which we invest, we would have to share on an equal basis any distributions with other creditors holding such debt in the event of an insolvency, liquidation, dissolution, reorganization, or bankruptcy of a portfolio company.

Prepayments of our investments by our portfolio companies could adversely impact our results of operations and reduce our return on equity.

In addition to risks associated with delays in investing our capital, we are also subject to the risk that investments we make in our portfolio companies may be repaid prior to maturity. We will first use any proceeds from prepayments to repay any borrowings outstanding on our Credit Facility. In the event that funds remain after repayment of our outstanding borrowings, then we will generally reinvest these proceeds in government securities, pending their future investment in new debt and/or equity securities. These government securities will typically have substantially lower yields than the debt securities being prepaid and we could experience significant delays in reinvesting these amounts. As a result, our results of operations could be materially adversely affected if one or more of our portfolio companies elect to prepay amounts owed to us. Additionally, prepayments could negatively impact our return on equity, which could result in a decline in the market price of our common stock.

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Higher taxation of our portfolio companies may impact our quarterly and annual operating results.

The recession’s adverse effect on federal, state and municipality revenues may induce these government entities to raise various taxes to make up for lost revenues. Additional taxation may have an adverse affect on our portfolio companies’ earnings and reduce their ability to repay our loans to them, thus affecting our quarterly and annual operating results.

Our portfolio is concentrated in a limited number of companies and industries, which subjects us to an increased risk of significant loss if any one of these companies does not repay us or if the industries experience downturns.

As of March 31, 2013, we had investments in 21 portfolio companies, of which there were three investments, Venyu, SOG and Acme that comprised approximately $101.1 million or 35.3% of our total investment portfolio, at fair value. A consequence of a limited number of investments is that the aggregate returns we realize may be substantially adversely affected by the unfavorable performance of a small number of such loans or a substantial write-down of any one investment. Beyond our regulatory and income tax diversification requirements, we do not have fixed guidelines for industry concentration and our investments could potentially be concentrated in relatively few industries. In addition, while we do not intend to invest 25% or more of our total assets in a particular industry or group of industries at the time of investment, it is possible that as the values of our portfolio companies change, one industry or a group of industries may comprise in excess of 25% of the value of our total assets. As of March 31, 2013, our largest industry concentration was in chemicals, plastics, and rubber representing 20.7% of our total investments, at fair value. As a result, a downturn in an industry in which we have invested a significant portion of our total assets could have a materially adverse effect on us.

Our investments are typically long term and will require several years to realize liquidation events.

Since we generally make five to seven year term loans and hold our loans and related warrants or other equity positions until the loans mature, you should not expect realization events, if any, to occur over the near term. In addition, we expect that any warrants or other equity positions that we receive when we make loans may require several years to appreciate in value and we cannot give any assurance that such appreciation will occur.

The disposition of our investments may result in contingent liabilities.

Currently, all of our investments involve private securities. In connection with the disposition of an investment in private securities, we may be required to make representations about the business and financial affairs of the underlying portfolio company typical of those made in connection with the sale of a business. We may also be required to indemnify the purchasers of such investment to the extent that any such representations turn out to be inaccurate or with respect to certain potential liabilities. These arrangements may result in contingent liabilities that ultimately yield funding obligations that must be satisfied through our return of certain distributions previously made to us.

There may be circumstances where our debt investments could be subordinated to claims of other creditors or we could be subject to lender liability claims.

Even though we have structured some of our investments as senior loans, if one of our portfolio companies were to go bankrupt, depending on the facts and circumstances, including the extent to which we actually provided managerial assistance to that portfolio company, a bankruptcy court might re-characterize our debt investments and subordinate all, or a portion, of our claims to that of other creditors. Holders of debt instruments ranking senior to our investments typically would be entitled to receive payment in full before we receive any distributions. After repaying such senior creditors, such portfolio company may not have any remaining assets to use to repay its obligation to us. We may also be subject to lender liability claims for actions taken by us with respect to a borrower’s business or in instances in which we exercised control over the borrower. It is possible that we could become subject to a lender’s liability claim, including as a result of actions taken in rendering significant managerial assistance.

Portfolio company litigation could result in additional costs and the diversion of management time and resources.

In the course of providing significant managerial assistance to certain of our portfolio companies, our executive officers sometimes serve as directors on the boards of such companies. To the extent that litigation arises out of our investments in these companies, such executive officers may be named as defendants in such litigation, which could result in additional costs and the diversion of management time and resources.

We may not realize gains from our equity investments and other yield enhancements.

When we make a subordinated loan, we may receive warrants to purchase stock issued by the borrower or other yield enhancements, such as success fees. Our goal is to ultimately dispose of these equity interests and realize gains upon our disposition of such interests. We expect that, over time, the gains we realize on these warrants and other yield enhancements will offset any losses we experience on loan defaults. However, any warrants we receive may not appreciate in value and, in fact, may decline in value and any other yield enhancements, such as success fees, may not be realized. Accordingly, we may not be able to realize gains from our equity interests or other yield enhancements and any gains we do recognize may not be sufficient to offset losses we experience on our loan portfolio.

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During the fiscal year ended March 31, 2013, we recorded a realized gain of $0.8 million relating to post-closing adjustments on our previous investment exit of A. Strucki, and during the fiscal year ended March 31, 2012, we recapitalized our investment in Cavert II Holdings Corp (“Cavert”), receiving $8.5 million in proceeds and realizing a gain of $5.5 million. Additionally, during the fiscal year ended March 31, 2011, we achieved realized gains of $23.5 million in aggregate with the sale of A. Stucki Holding Corp. (“A. Stucki”) in June 2010 and Chase II Holding Corp. (“Chase”) in December 2010. These were the first management-supported buyout liquidity events since our inception in 2005. There can be no guarantees that such realized gains can be achieved in future periods and the impact of such sales on our results of operations for the fiscal years 2013, 2012 and 2011 should not be relied upon as being indicative of performance in future periods.

Any unrealized depreciation we experience on our investment portfolio may be an indication of future realized losses, which could reduce our income available for distribution.

As a BDC we are required to carry our investments at market value or, if no market value is ascertainable, at fair value as determined in good faith by or under the direction of our Board of Directors. We will record decreases in the market values or fair values of our investments as unrealized depreciation. Since our inception, we have, at times, incurred a cumulative net unrealized depreciation of our portfolio. Any unrealized depreciation in our investment portfolio could result in realized losses in the future and ultimately in reductions of our income available for distribution to stockholders in future periods.

Risks Related to Our Regulation and Structure

We currently do not meet the 50% threshold of the asset diversification test applicable to RICs under the Code. If we make any additional investment in the future, including advances under outstanding lines of credit to our portfolio companies, and remain below this threshold as of June 30, 2013, or any subsequent quarter end, we would lose our RIC status unless we are able to cure such failure within 30 days of the quarter end.

In order to maintain RIC status under the Code, in addition to other requirements, as of the close of each quarter of our taxable year, we must meet the asset diversification test, which requires that at least 50% of the value of our assets consist of cash, cash items, U.S. government securities, the securities of other RICs and other securities to the extent such other securities of any one issuer do not represent more than 5% of our total assets or more than 10% of the voting securities of such issuer. As a result of changes in the makeup of our assets during 2009, we have not continuously exceeded the 50% threshold. As of March 31, 2013, as with each quarterly measurement since June 30, 2009, we satisfied the 50% threshold through the purchase of short-term qualified securities, which was funded primarily through a short-term loan agreement. Subsequent to the March 31 measurement date, the short-term qualified securities matured, and we repaid the short-term loan, at which time we again fell below the 50% threshold. Until the composition of our assets is continuously above the required 50% threshold, we will continue to seek to deploy similar purchases of qualified securities using short-term loans that would allow us to satisfy the asset diversification test, thereby allowing us to make new or additional investments. There can be no assurance, however, that we will be able to acquire short-term qualified securities in the future on reasonable terms, if at all. Failure to meet this threshold alone however, may not result in the loss of our RIC status. In circumstances where the failure to meet the 50% threshold as of a quarterly measurement date is the result of fluctuations in the value of assets, including in our case as a result of the sale of assets, we are still deemed under the rules to have satisfied the asset diversification test and, therefore, maintain our RIC status, as long as we have not made any new investments, including additional investments in our portfolio companies (such as advances under outstanding lines of credit), since the time that we fell below the 50% threshold. Thus, while we currently qualify as a RIC despite our current inability to continuously meet the 50% threshold and potential inability to do so in the future, if we make any new or additional investments before regaining compliance with the asset diversification test, our RIC status will be threatened. Because, in most circumstances, we are contractually required to advance funds on outstanding lines of credit upon the request of our portfolio companies, we may have a limited ability to avoid adding to existing investments in a manner that would cause us to fail the asset diversification test as of future quarterly measurement dates.

If we were to make a new or additional investment before regaining continuous compliance with the 50% threshold, and we were not in compliance prior to the next quarterly measurement date following such investment, we would have thirty days to “cure” our failure to meet the 50% threshold at such quarterly measurement date to avoid our loss of RIC status. Potential cures for failure of the asset diversification test include raising additional equity or debt capital as we have done, or changing the composition of our assets, which could include full or partial divestitures of investments, such that we would once again meet or exceed the 50% threshold at such quarterly measurement date. Our ability to implement any of these cures would be subject to market conditions and a number of risks and uncertainties that would be, in part, beyond our control. Accordingly, we cannot guarantee you that we would be successful in curing any failure of the asset diversification test, which would subject us to corporate level tax. For additional information about the consequences of failing to satisfy the RIC qualification requirements, see “—We will be subject to corporate-level tax if we are unable to satisfy Code requirements for RIC qualification.”

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We will be subject to corporate-level tax if we are unable to satisfy Code requirements for RIC qualification.

To maintain our qualification as a RIC, we must meet income source, asset diversification and annual distribution requirements. The annual distribution requirement is satisfied if we distribute at least 90% of our ordinary income and the excess of our net short-term capital gains over our net long-term capital losses to our stockholders on an annual basis. Because we use leverage, we are subject to certain asset coverage ratio requirements under the 1940 Act and could, under certain circumstances, be restricted from making distributions necessary to qualify as a RIC. Warrants we receive with respect to debt investments will create “original issue discount,” which we must recognize as ordinary income, increasing the amounts we are required to distribute to maintain RIC status. Because such warrants will not produce distributable cash for us at the same time as we are required to make distributions in respect of the related original issue discount, we will need to use cash from other sources to satisfy such distribution requirements. The asset diversification requirements must be met at the end of each calendar quarter. If we fail to meet these tests, we may need to quickly dispose of certain investments to prevent the loss of RIC status. Since most of our investments will be illiquid, such dispositions, if even possible, may not be made at prices advantageous to us and, in fact, may result in substantial losses. If we fail to qualify as a RIC for any reason and become fully subject to corporate income tax, the resulting corporate taxes could substantially reduce our net assets, the amount of income available for distribution, and the actual amount distributed. Such a failure would have a material adverse effect on us and our shares. For additional information regarding asset coverage ratio and RIC requirements, see “Material U.S. Federal Income Tax Considerations—RIC Status.”

From time to time, some of our debt investments may include success fees that would generate payments to us if the business is ultimately sold. Because the satisfaction of these success fees, and the ultimate payment of these fees, is uncertain, we do not recognize them as income until we have received payment. We sought and received approval for a change in accounting method from the IRS related to our tax treatment for success fees. As a result, we, in effect, will continue to account for the recognition of income from the success fees upon receipt, or when the amounts become fixed. Prior to January 1, 2011, we treated the success fee amounts as a capital gain for tax characterization purposes. However, beginning January 1, 2011, the success fee amounts are characterized as ordinary income for tax purposes. The approved change in accounting method does not require us to retroactively change the capital gains treatment of the success fees received prior to January 1, 2011. As a result, we are required to distribute such amounts to our stockholders in order to maintain RIC status for success fees we receive after January 1, 2011.

Changes in laws or regulations governing our operations, or changes in the interpretation thereof, and any failure by us to comply with laws or regulations governing our operations may adversely affect our business.

We and our portfolio companies are subject to regulation by laws at the local, state and federal levels. These laws and regulations, as well as their interpretation, may be changed from time to time. Accordingly, any change in these laws or regulations, or their interpretation, or any failure by us or our portfolio companies to comply with these laws or regulations may adversely affect our business. For additional information regarding the regulations to which we are subject, see “Material U.S. Federal Income Tax Considerations—RIC Status” and “Regulation as a Business Development Company.”

Provisions of the Delaware General Corporation Law and of our certificate of incorporation and bylaws could restrict a change in control and have an adverse impact on the price of our common stock.

We are subject to provisions of the Delaware General Corporation Law that, in general, prohibit any business combination with a beneficial owner of 15% or more of our common stock for three years unless the holder’s acquisition of our stock was either approved in advance by our Board of Directors or ratified by the Board of Directors and stockholders owning two-thirds of our outstanding stock not owned by the acquiring holder. Although we believe these provisions collectively provide for an opportunity to receive higher bids by requiring potential acquirers to negotiate with our Board of Directors, they would apply even if the offer may be considered beneficial by some stockholders.

We have also adopted other measures that may make it difficult for a third party to obtain control of us, including provisions of our certificate of incorporation classifying our Board of Directors in three classes serving staggered three-year terms, and provisions of our certificate of incorporation authorizing our Board of Directors to induce the issuance of additional shares of our stock. These provisions, as well as other provisions of our certificate of incorporation and bylaws, may delay, defer, or prevent a transaction or a change in control that might otherwise be in the best interests of our stockholders.

Risks Related to an Investment in Our Common or Preferred Stock

We may experience fluctuations in our quarterly and annual operating results.

We may experience fluctuations in our quarterly and annual operating results due to a number of factors, including, among others, variations in our investment income, the interest rates payable on the debt securities we acquire, the default rates on such securities, the level of our expenses, variations in and the timing of the recognition of realized and unrealized gains or losses, the level of our expenses, the degree to which we encounter competition in our markets, and general economic conditions, including the impacts of inflation. The majority of our portfolio companies are in industries that are directly impacted by inflation, such as manufacturing and consumer goods and services. Our portfolio companies may not be able to pass on to customers increases in their costs of production

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which could greatly affect their operating results, impacting their ability to repay our loans. In addition, any projected future decreases in our portfolio companies’ operating results due to inflation could adversely impact the fair value of those investments. Any decreases in the fair value of our investments could result in future realized and unrealized losses and therefore reduce our net assets resulting from operations. As a result of these factors, results for any period should not be relied upon as being indicative of performance in future periods.

There is a risk that you may not receive distributions or that distributions may not grow over time.

Our current intention is to distribute at least 90% of our ordinary income and short-term capital gains to our stockholders on a quarterly basis by paying monthly distributions. We expect to retain some or all net realized long-term capital gains by first offsetting them with realized capital losses, and, secondly, through a “deemed distribution” to supplement our equity capital and support the growth of our portfolio, although our Board of Directors may determine in certain cases to distribute these gains to our common stockholders. In addition, our Credit Facility restricts the amount of distributions we are permitted to make. We cannot assure you that we will achieve investment results or maintain a tax status that will allow or require any specified level of cash distributions.

Distributions to our stockholders have included and may in the future include a return of capital.

Our Board of Directors declares monthly distributions based on estimates of taxable income for each fiscal year, which may differ, and in the past have differed, from actual results. Because our distributions are based on estimates of taxable income that may differ from actual results, future distributions payable to our stockholders may also include a return of capital. Moreover, to the extent that we distribute amounts that exceed our accumulated earnings and profits, these distributions constitute a return of capital. A return of capital represents a return of a stockholder’s original investment in shares of our stock and should not be confused with a distribution from earnings and profits. Although return of capital distributions may not be taxable, such distributions may increase an investor’s tax liability for capital gains upon the sale of our shares by reducing the investor’s tax basis for such shares. Such returns of capital reduce our asset base and also adversely impact our ability to raise debt capital as a result of the leverage restrictions under the 1940 Act, which could have a material adverse impact on our ability to make new investments.

The market price of our shares may fluctuate significantly.

The trading price of our common stock and our preferred stock may fluctuate substantially. The extreme volatility and disruption that have affected the capital and credit markets over the past few years, we have experienced greater than usual stock price volatility.

The market price and marketability of our shares may from time to time be significantly affected by numerous factors, including many over which we have no control and that may not be directly related to us. These factors include, but are not limited to, the following:

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Fluctuations in the trading prices of our shares may adversely affect the liquidity of the trading market for our shares and, if we seek to raise capital through future equity financings, our ability to raise such equity capital.

The issuance of subscription rights to our existing stockholders may dilute the ownership and voting powers of existing stockholders in our common stock, dilute the NAV of their shares and have a material adverse effect on the trading price of our common stock.

In April 2008, we completed an offering of transferable rights to subscribe for additional shares of our common stock, or subscription rights. We raised equity in this manner primarily due to the capital raising constraints applicable to us under the 1940 Act when our common stock is trading below its NAV per share, as it was at the time of the rights offering. In the event that we again issue subscription rights to our existing stockholders, there is a significant possibility that the rights offering will dilute the ownership interest and voting power of stockholders who do not fully exercise their subscription rights. Stockholders who do not fully exercise their subscription rights should expect that they will, upon completion of the rights offering, own a smaller proportional interest in the Company than would otherwise be the case if they fully exercised their subscription rights. In addition, because the subscription price of the rights offering is likely to be less than our most recently determined NAV per share, our common stockholders are likely to experience an immediate dilution of the per share NAV of their shares as a result of the offer. As a result of these factors, any future rights offerings of our common stock, or our announcement of our intention to conduct a rights offering, could have a material adverse impact on the trading price of our common stock.

Shares of closed-end investment companies frequently trade at a discount from NAV.

Shares of closed-end investment companies frequently trade at a discount from NAV. Since our inception, our common stock has at times traded above NAV, and at times traded below NAV. During the past year, our common stock has consistently, and at times significantly, traded below NAV. Subsequent to March 31, 2013, our common stock has traded at discounts of up to 29.6% of our NAV per share, which was $9.10 as of March 31, 2013. This characteristic of shares of closed-end investment companies is separate and distinct from the risk that our NAV per share will decline. As with any stock, the price of our shares will fluctuate with market conditions and other factors. If shares are sold, the price received may be more or less than the original investment. Whether investors will realize gains or losses upon the sale of our shares will not depend directly upon our NAV, but will depend upon the market price of the shares at the time of sale. Since the market price of our shares will be affected by such factors as the relative demand for and supply of the shares in the market, general market and economic conditions and other factors beyond our control, we cannot predict whether the shares will trade at, below or above our NAV. Under the 1940 Act, we are generally not able to issue additional shares of our common stock at a price below NAV per share to purchasers other than our existing stockholders through a rights offering without first obtaining the approval of our common stockholders and our independent directors. Additionally, at times when our common stock is trading below its NAV per share, our dividend yield may exceed the weighted average returns that we would expect to realize on new investments that would be made with the proceeds from the sale of such stock, making it unlikely that we would determine to issue additional shares in such circumstances. Thus, for as long as our common stock trades below NAV we will be subject to significant constraints on our ability to raise capital through the issuance of common stock. Additionally, an extended period of time in which we are unable to raise capital may restrict our ability to grow and adversely impact our ability to increase or maintain our distributions.

Stockholders may incur dilution if we sell shares of our common stock in one or more offerings at prices below the then current NAV per share of our common stock.

At our most recent annual meeting, our stockholders approved a proposal designed to allow us to access the capital markets in a way that absent stockholder approval, we are generally unable to due to restrictions applicable to BDCs under the 1940 Act. Specifically, our stockholders approved a proposal that authorizes us to sell shares of our common stock below the then current NAV per share of our common stock in one or more offerings for a period of one year, subject to certain conditions (including, but not limited to, that the number of common shares issued and sold pursuant to such authority does not exceed 25% of our then outstanding common stock immediately prior to each such sale).

We exercised this right with Board of Director approval in October 2012, when we completed a public offering of 4.4 million shares of our common stock at a public offering price of $7.50 per share, which was below our then current NAV of $8.65 per share. Gross proceeds totaled $33.0 million and net proceeds, after deducting underwriting discounts and offering expenses borne by us, were $31.0 million. The net dilutive effect of the issuance of common stock, net of expenses, below NAV was $0.31 per share of common stock.

At the upcoming annual stockholders meeting scheduled for August 8, 2013, our stockholders will again be asked to vote in favor of renewing this proposal for another year. During the past year, our common stock has consistently, and at times significantly, traded below NAV. Any decision to sell shares of our common stock below the then current NAV per share of our common stock would be subject to the determination by our Board of Directors that such issuance is in our and our stockholders’ best interests.

If we were to sell shares of our common stock below NAV per share, such sales would result in an immediate dilution to the NAV per share. This dilution would occur as a result of the sale of shares at a price below the then current NAV per share of our common stock

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and a proportionately greater decrease in a stockholder’s interest in our earnings and assets and voting interest in us than the increase in our assets resulting from such issuance. The greater the difference between the sale price and the NAV per share at the time of the offering, the more significant the dilutive impact would be. Because the number of shares of common stock that could be so issued and the timing of any issuance is not currently known, the actual dilutive effect, if any, cannot be currently predicted. However, if, for example, we sold an additional 10% of our common stock at a 5% discount from NAV, a stockholder who did not participate in that offering for its proportionate interest would suffer NAV dilution of up to 0.5% or $5 per $1,000 of NAV.

If we fail to pay dividends on our Term Preferred Stock for two years, the holders of our Term Preferred Stock will be entitled to elect a majority of our directors.

The terms of our Term Preferred Stock provide for annual dividends in the amount of $1.7813 per outstanding share of Term Preferred Stock. In accordance with the terms of our Term Preferred Stock, if dividends thereon are unpaid in an amount equal to at least two years of dividends, the holders of Term Preferred Stock will be entitled to elect a majority of our Board of Directors.

Our Term Preferred Stock magnifies the potential for gain or loss for our holders of common stock and the risks of investing in our common stock in the same way as our borrowings.

Preferred stock, which is another form of leverage, has the same risks to our common stockholders as borrowings because the dividends on any preferred stock we issue must be cumulative. Payment of such dividends and repayment of the liquidation preference of such preferred stock must take preference over any dividends or other payments to our common stockholders, and preferred stockholders are less subject to our expenses or losses and are not entitled to participate in any income or appreciation in excess of their stated preference.

An investment in Term Preferred Stock with a fixed interest rate bears interest rate risk.

Our Term Preferred Stock, in general, pays dividends at a fixed dividend rate of 7.125% per year. Prices of fixed income investments generally vary inversely with changes in market yields. The market yields on securities comparable to the Term Preferred Stock may increase, which would likely result in a decline in the secondary market price of the Term Preferred Stock prior to the term redemption date. This risk may be even more significant in light of the low nature of the currently prevailing market interest rates.

A liquid secondary trading market for our Term Preferred Stock may not develop.

Although our Term Preferred Stock is listed for trading on the NASDAQ Global Select Market (“NASDAQ”), such shares are thinly traded, and the market for such shares is relatively illiquid compared to the market for other types of securities, with the spread between the bid and ask prices considerably greater than the spreads of other securities with comparable terms and features.

The Term Preferred Stock is not rated.

We have not had the Term Preferred Stock rated by any rating agency. Unrated securities usually trade at a discount to similar rated securities. As a result, there is a risk that the shares of our Term Preferred Stock may trade at a price that is lower than they might otherwise trade if they were rated by a rating agency.

The Term Preferred Stock bear a risk of early redemption by us.

We may voluntarily redeem some or all of the Term Preferred Stock on or after February 28, 2016, which is one year prior to its mandatory redemption date of February 28, 2017. We also may be forced to redeem some or all of the Term Preferred Stock to meet regulatory requirements and the asset coverage requirements of such shares, and any such redemption may occur at a time that is unfavorable to holders of the Term Preferred Stock. We may have an incentive to redeem the Term Preferred Stock voluntarily before the mandatory redemption date if market conditions allow us to issue other preferred stock or debt securities at a rate that is lower than the fixed dividend rate on the Term Preferred Stock.

Claims of holders of our Term Preferred Stock are subject to a risk of subordination relative to holders of our debt instruments.

Rights of holders of our Term Preferred Stock are subordinated to the rights of holders of our indebtedness. Therefore, dividends, distributions and other payments to holders of Term Preferred Stock in liquidation or otherwise may be subject to prior payments due to the holders of our indebtedness. In addition, under some circumstances the 1940 Act may provide debt holders with voting rights that are superior to the voting rights of holders of the Term Preferred Stock.

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Holders of our Term Preferred Stock are subject to inflation risk.

Inflation is the reduction in the purchasing power of money resulting from the increase in the price of goods and services. Inflation risk is the risk that the inflation-adjusted, or “real,” value of an investment in Term Preferred Stock or the income from that investment will be worth less in the future. As inflation occurs, the real value of the Term Preferred Stock and dividends payable on such shares declines.

Holders of our Term Preferred Stock bear reinvestment risk.

Given the five-year term and potential for early redemption of the Term Preferred Stock, holders of such shares may face an increased reinvestment risk, which is the risk that the return on an investment purchased with proceeds from the sale or redemption of the Term Preferred Stock may be lower than the return previously obtained from the investment in such shares.

Holders of our Term Preferred Stock bear dividend risk.

We may be unable to pay dividends on the Term Preferred Stock under some circumstances. The terms of our indebtedness preclude the payment of dividends in respect of equity securities, including the Term Preferred Stock, under certain conditions.

There is a risk of delay in our redemption of our Term Preferred Stock, and we may fail to redeem such securities as required by their terms.

We will generally make investments in private companies whose securities are not traded in any public market. Substantially all of the investments we presently hold and the investments we expect to acquire in the future are, and will be, subject to legal and other restrictions on resale and will otherwise be less liquid than publicly-traded securities. The illiquidity of our investments may make it difficult for us to obtain cash equal to the value at which we record our investments quickly if a need arises. If we are unable to obtain sufficient liquidity prior to the term redemption date, we may be forced to engage in a partial redemption or to delay a required redemption. If such a partial redemption or delay were to occur, the market price of the Term Preferred Stock might be adversely affected.

Other Risks

We could face losses and potential liability if intrusion, viruses or similar disruptions to our technology jeopardize our confidential information, whether through breach of our network security or otherwise.

Maintaining our network security is of critical importance because our systems store highly confidential financial models and portfolio company information. Although we have implemented, and will continue to implement, security measures, our technology platform is and will continue to be vulnerable to intrusion, computer viruses or similar disruptive problems caused by transmission from unauthorized users. The misappropriation of proprietary information could expose us to a risk of loss or litigation.

Terrorist attacks, acts of war, or national disasters may affect any market for our common stock, impact the businesses in which we invest, and harm our business, operating results, and financial conditions.

Terrorist acts, acts of war, or national disasters have created, and continue to create, economic and political uncertainties and have contributed to global economic instability. Future terrorist activities, military or security operations, or national disasters could further weaken the domestic/global economies and create additional uncertainties, which may negatively impact the businesses in which we invest directly or indirectly and, in turn, could have a material adverse impact on our business, operating results, and financial condition. Losses from terrorist attacks and national disasters are generally uninsurable.

Pending legislation may allow us to incur additional leverage.

As a BDC, we are generally not permitted to incur indebtedness (which include senior securities representing indebtedness and senior securities that are stock) unless immediately after such borrowing we have asset coverage (as defined in Section 18(h) of the 1940 Act) of at least 200% (i.e. the amount of borrowings may not exceed 50% of the value of our assets). Pending legislation in the U.S. House of Representatives, if passed, would modify this section of the 1940 Act and increase the amount of such indebtedness that business development companies may incur by modifying the percentage from 200% to 150%. As a result, we may be able to incur additional indebtedness in the future and therefore your risk of an investment in us may increase. Our Term Preferred Stock is a senior security that is stock and so for this 200% asset coverage threshold is included as total indebtedness.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

All statements contained herein or in any accompanying prospectus supplement, other than historical facts, may constitute “forward-looking statements.” These statements may relate to, among other things, future events or our future performance or financial condition. In some cases, you can identify forward-looking statements by terminology such as “may,” “might,” “believe,” “will,” “provide,” “anticipate,” “future,” “could,” “growth,” “plan,” “intend,” “expect,” “should,” “would,” “if,” “seek,” “possible,” “potential,” “likely” or the negative of such terms or comparable terminology. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward-looking statements. Such factors include, among others: (1) further adverse changes in the economy and the capital markets; (2) risks associated with negotiation and consummation of pending and future transactions; (3) the loss of one or more of our executive officers, in particular David Gladstone, Terry Lee Brubaker or David Dullum; (4) changes in our business strategy; (5) availability, terms and deployment of capital; (6) changes in our industry, interest rates, exchange rates or the general economy; (7) the degree and nature of our competition; and (8) those factors described in the “Risk Factors” section of this prospectus and any accompanying prospectus supplement. We caution readers not to place undue reliance on any such forward-looking statement.

We have based the forward-looking statements on information available to us on the date of this prospectus. Except as required by the federal securities laws, we undertake no obligation to revise or update any forward-looking statements, whether as a result of new information, future events or otherwise. You are advised to review any additional disclosures that we may make directly to you or through reports that we in the future may file with the SEC, including annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

USE OF PROCEEDS

Unless otherwise specified in any prospectus supplement accompanying this prospectus, we intend to use the net proceeds from the sale of the Securities first to pay down existing short-term debt, then to make investments in small and mid-sized businesses in accordance with our investment objectives, with any remaining proceeds to be used for other general corporate purposes. Indebtedness under our Credit Facility currently accrues interest at the rate of approximately 4% and matures on April 30, 2016. We anticipate that substantially all of the net proceeds of any offering of Securities will be utilized in the manner described above within three months of the completion of such offering. Pending such utilization, we intend to invest the net proceeds of any offering of Securities primarily in cash, cash equivalents, U.S. government securities, and other high-quality debt investments that mature in one year or less from the date of investment, consistent with the requirements for continued qualification as a RIC for federal income tax purposes.

PRICE RANGE OF COMMON STOCK AND DISTRIBUTIONS

We currently intend to distribute in the form of cash dividends, a minimum of 90% of our ordinary income and short-term capital gains, if any, on a quarterly basis to our stockholders in the form of monthly dividends. We intend to retain long-term capital gains and treat them as deemed distributions for tax purposes. We report the estimated tax characteristics of each distribution when declared while the actual tax characteristics of distributions are reported annually to each stockholder on IRS Form 1099—DIV. There is no assurance that we will achieve investment results or maintain a tax status that will permit any specified level of cash distributions or year-to-year increases in cash distributions. At the option of a holder of record of common stock, all cash distributions can be reinvested automatically under our dividend reinvestment plan in additional whole and fractional shares. A stockholder whose shares are held in the name of a broker or other nominee should contact the broker or nominee regarding participation in our dividend reinvestment plan on the stockholder’s behalf. See “Risk Factors—Risks Related to Our Business and Structure—We will be subject to corporate-level tax if we are unable to satisfy Code requirements for RIC qualification;” “Dividend Reinvestment Plan;” and “Material U.S. Federal Income Tax Considerations.”

Our common stock is traded on the NASDAQ under the symbol “GAIN.” The following table reflects, by quarter, the high and low sales prices per share of our common stock on the NASDAQ, the sales prices as a percentage of NAV and quarterly distributions declared per share for each fiscal quarter during the last two fiscal years and the current fiscal year through June 5, 2013.

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Common shares of closed-end investment companies frequently trade at a discount to their NAV. The possibility that our shares may trade at such discount to our NAV is separate and distinct from the risk that our NAV per share may decline. We cannot predict whether our shares will trade above, at or below NAV, although during the past three years, our common stock has consistently traded, and at times significantly, below NAV.

As of May 31, 2013, there were approximately 25 record owners of our common stock.

The following are our outstanding classes of securities as of March 31, 2013.

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For purposes of computing the ratios, fixed charges include interest expense on borrowings, dividend expense on mandatorily redeemable preferred stock and amortization of deferred financing fees.

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CONSOLIDATED SELECTED FINANCIAL AND OTHER DATA

The following consolidated selected financial data as of and for the fiscal years ended March 31, 2013, 2012, 2011, 2010, and 2009, are derived from our audited consolidated financial statements. The other data included at the bottom of the table is unaudited. The data should be read in conjunction with our consolidated financial statements and notes thereto and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included elsewhere in this prospectus.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS

(dollar amounts in thousands, except per share data and as otherwise indicated)

The following analysis of our financial condition and results of operations should be read in conjunction with our consolidated financial statements and the notes thereto contained elsewhere herein.

OVERVIEW

General

We are an externally managed, closed-end, non-diversified management investment company that has elected to be regulated as a business development company under the 1940 Act. In addition, for U.S. federal income tax purposes, we have elected to be treated as a RIC under Subchapter M of the Code. As a business development company and a RIC, we are also subject to certain constraints, including limitations imposed by the 1940 Act and the Code.

We were incorporated under the General Corporation Law of the State of Delaware on February 18, 2005. We were established for the purpose of investing in debt and equity securities of established private businesses in the United States (“U.S.”). Debt investments primarily come in the form of three types of loans: senior term loans, senior subordinated loans and junior subordinated debt. Equity investments take the form of preferred or common equity (or warrants or options to acquire the foregoing), often in connection with buyouts and other recapitalizations. To a much lesser extent, we also invest in senior and subordinated syndicated loans. Our investment objectives are (a) to achieve and grow current income by investing in debt securities of established businesses that we believe will provide stable earnings and cash flow to pay expenses, make principal and interest payments on our outstanding indebtedness and make distributions to stockholders that grow over time and (b) to provide our stockholders with long-term capital appreciation in the value of our assets by investing in equity securities of established businesses that we believe can grow over time to permit us to sell our equity investments for capital gains. We aim to maintain a portfolio consisting of approximately 80% debt investment and 20% equity investment, at cost.

We focus on investing in small and medium-sized private U.S. businesses that meet certain criteria, including some but not all of the following: the potential for growth in cash flow, adequate assets for loan collateral, experienced management teams with a significant ownership interest in the borrower, profitable operations based on the borrower’s cash flow, reasonable capitalization of the borrower (usually by leveraged buyout funds or venture capital funds) and the potential to realize appreciation and gain liquidity in our equity position, if any. We anticipate that liquidity in our equity position will be achieved through a merger or acquisition of the borrower, a public offering of the borrower’s stock or by exercising our right to require the borrower to repurchase our warrants, though there can be no assurance that we will always have these rights. We lend to borrowers that need funds to finance growth, restructure their balance sheets or effect a change of control. We invest by ourselves or jointly with other funds and/or management of the portfolio company, depending on the opportunity. If we are participating in an investment with one or more co-investors, our investment is likely to be smaller than if we were investing alone.

Our common stock and Term Preferred Stock are traded on the NASDAQ Global Select Market (“NASDAQ”) under the symbols “GAIN” and “GAINP,” respectively.

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Business Environment

The strength of the global economy, and the U.S. economy in particular, continues to be uncertain and volatile, and we remain cautious about a long-term economic recovery. The recession in general, and the disruptions in the capital markets in particular, have impacted our liquidity options and increased the cost of debt and equity capital. Many of our portfolio companies, as well as those that we evaluate for possible investments, are impacted by these economic conditions. If these conditions persist, it may affect their ability to repay our loans or engage in a liquidity event, such as a sale, recapitalization or initial public offering.

Capital Raising Efforts

Despite the challenges in these uncertain economic times, over the past year and a half, we have been able to extend and increase the size of our revolving line of credit (our “Credit Facility”) and complete public offerings of preferred and common stock. In October 2012, we extended the maturity date on our Credit Facility an additional year to 2015 and subsequently, in April 2013, we extended the maturity date another six months into 2016 and increased the commitment amount from $60 million to $70 million. In March 2012, we issued 1.6 million shares of 7.125% Series A Cumulative Term Preferred Stock (our “Term Preferred Stock”) for gross proceeds of $40.0 million. In October 2012, we issued 4.4 million shares of common stock for gross proceeds of $33.0 million. We discuss each of the foregoing in detail below under “ Recent Developments .”

Despite our public offering of common stock during the fiscal year, market conditions continue to affect the trading price of our common stock and thus our ability to finance new investments through the issuance of equity. On May 10, 2013, the closing market price of our common stock was $7.25, which represented a 20.3% discount to our March 31, 2013, net asset value (“NAV”) per share of $9.10. When our stock trades below NAV, our ability to issue equity is constrained by provisions of the Investment Company Act of 1940 (the “1940 Act”), which generally prohibits the issuance and sale of our common stock at an issuance price below the then current NAV per share without stockholder approval other than through sales to our then-existing stockholders pursuant to a rights offering.

At our annual meeting of stockholders held on August 9, 2012, our stockholders approved a proposal which authorizes us to sell shares of our common stock at a price below our then current NAV per share, subject to certain limitations, including that the number of shares issued and sold pursuant to such authority does not exceed 25% of our then outstanding common stock immediately prior to each such sale, provided that our Board of Directors makes certain determinations prior to any such sale. This proposal is in effect for one year from the date of stockholder approval. With our Board of Directors’ approval, we issued shares of our common stock in October and November 2012 at a price per share below the then current NAV per share. The resulting proceeds, in part, have and will allow us to grow the portfolio by making new investments, generate additional income through these new investments, provide us additional equity capital to help ensure continued compliance with regulatory tests and allow us to increase our debt capital while still complying with our applicable debt to equity ratios. At our next annual meeting of stockholders, scheduled to take place in August 2013, we expect to ask our stockholders to vote in favor of this proposal again so that it may be in effect for another year.

New Investments

While conditions remain challenging, we are seeing an increase in the number of new investment opportunities consistent with our investing strategy of providing a combination of debt and equity in support of management and sponsor-led buyouts of small and medium-sized companies in the U.S. These opportunities and the aforementioned capital raising efforts have allowed us to invest approximately $201.4 million into 11 new proprietary debt and equity deals since October 2010. During the fiscal year ended March 31, 2013, we invested a total of $69.0 million in four new deals. Subsequent to March 31, 2013, we invested $17.7 million in Jackrabbit, Inc. (“Jackrabbit”), a manufacturer of nut harvesting equipment.

Each of these new investments, as well as the majority of our debt securities in our portfolio has a success fee component, which enhances the yield on our debt investment. Unlike paid in kind (“PIK”) income, we do not recognize the fee into income until it is received in cash. As a result, as of March 31, 2013, we had an off-balance sheet success fee receivable of $12.9 million, or approximately $0.49 per common share. Due to their contingent nature, there are no guarantees that we will be able to collect all of these success fees or know the timing of such collections.

Regulatory Compliance

Due to the limited number of investments in our portfolio, our asset composition may affect our ability to satisfy certain requirements of the Internal Revenue Code of 1986, as amended (the “Code”), for maintenance of our status as a regulated investment company (“RIC”) under subchapter M of the Code. To maintain our status as a RIC, in addition to other requirements, as of the close of each quarter of our taxable year, we must meet the asset diversification test, which requires that at least 50% of the value of our assets consist of cash, cash items, U.S. government securities or certain other qualified securities (the “50% threshold”).

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Failure to meet the 50% threshold alone, however, may not result in our loss of RIC status. In circumstances where the failure to meet the 50% threshold is the result of fluctuations in the value of our assets, including as a result of the sale of assets, we will still be deemed to have satisfied the 50% threshold and, therefore, maintain our RIC status, provided that we have not made any new investments, including additional investments in our existing portfolio companies (such as advances under outstanding lines of credit), since the time that we fell below the 50% threshold. As of March 31, 2013, we satisfied the 50% threshold primarily through the purchase of short-term qualified securities, which was funded through a short-term loan agreement. Subsequent to the March 31, 2013, measurement date, the short-term qualified securities matured and we repaid the short-term loan. See “ —Recent Developments— Short-Term Loan ” for more information regarding this transaction. As of the date of this filing, we are once again below the 50% threshold.

Thus, while we currently qualify as a RIC despite our recent inability to continuously meet the 50% threshold and potential inability to do so in the future, if we make any new or additional investments before regaining continuous compliance with the asset diversification test, our RIC status could be threatened. If we make a new or additional investment and fail to regain compliance with the 50% threshold on the next quarterly measurement date following such investment, we will be in non-compliance with the RIC rules and will have thirty days to “cure” our failure to meet the 50% threshold to avoid the loss of our RIC status. Potential cures for failure of the asset diversification test include raising additional equity or debt capital, or changing the composition of our assets, which could include full or partial divestitures of investments, such that we would once again exceed the 50% threshold on a consistent basis.

Until the composition of our assets satisfies the required 50% threshold on a consistent basis, we will continue to seek to employ similar purchases of qualified securities using short-term loans that would allow us to satisfy the 50% threshold at each quarterly measurement date, thereby allowing us to make additional investments. There can be no assurance, however, that we will be able to enter into such a transaction on reasonable terms, if at all. We also continue to explore a number of other strategies, including changing the composition of our assets, which could include full or partial divestitures of investments, and raising additional equity or debt capital, such that we would once again exceed the 50% threshold on a consistent basis. Our ability to implement any of these strategies will be subject to market conditions and a number of risks and uncertainties that are, in part, beyond our control.

Our ability to seek external debt financing, to the extent that it is available under current market conditions, is further subject to the asset coverage limitations of the 1940 Act, which require us to have an asset coverage ratio (as defined in Section 18(h) of the 1940 Act), of at least 200% on our senior securities representing indebtedness and our senior securities that are stock, which we refer to collectively as “senior securities.” As of March 31, 2013, our asset coverage ratio was 272%. The ratio is impacted, in part, by our need to obtain a short-term loan at quarter end to acquire short-term securities in order to satisfy the 50% threshold at each quarterly measurement date to maintain our RIC status. Between the quarter end measurement dates, when we do not have a short-term loan outstanding, our leverage and asset coverage ratio improve. However, until the composition of our assets is continuously above the required 50% threshold on a consistent basis, we will have to continue to obtain short-term loans on a quarterly basis. This strategy, while allowing us to satisfy the 50% threshold for our RIC status, limits our ability to use increased debt capital to make new investments, due to our asset coverage ratio limitations under the 1940 Act. Our October 2012 common stock offering, was completed, in part, to provide us additional equity capital to help ensure continued compliance with the 200% asset coverage ratio.

Investment Highlights

During the fiscal year ended March 31, 2013, we disbursed $68.0 million in new debt and equity investments and extended $15.5 million of investments to existing portfolio companies through revolver draws or additions to term notes. From our initial public offering in June 2005 through March 31, 2013, we have made 192 investments in 98 companies for a total of approximately $800.0 million, before giving effect to principal repayments on investments and divestitures.

Investment Activity

During our fiscal year ended March 31, 2013, the following significant transactions occurred:

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Recent Developments

Credit Facility Extension and Expansion

On April 30, 2013, we, through our wholly-owned subsidiary Gladstone Business Investment, LLC (“Business Investment”) entered into a fifth amended and restated credit agreement providing for a $70.0 million revolving line of credit (the “Credit Facility”) arranged by Key Equipment Finance Inc. (“KEF”) as administrative agent. Branch Banking and Trust Company (“BB&T”) also joined the Credit Facility as a lender. The fifth amended and restated agreement increased the net commitment amount from $60.0 million to $70.0 million and extended the maturity date approximately six months to April 30, 2016 (the “Maturity Date”) and, if not renewed or extended by the Maturity Date, all principal and interest will be due and payable on or before April 30, 2017 (one year after the Maturity Date). In addition, there are two one-year extension options to be agreed upon by all parties, which may be exercised on or before April 30, 2014 and 2015, as applicable. Subject to certain terms and conditions, the Credit Facility may be expanded to a total $200.0 million through the addition of other lenders to the facility. Advances under the Credit Facility will generally bear interest at the 30-day London Interbank Offered Rate (“LIBOR”), plus 3.75% per annum, with an unused fee of 0.50% on undrawn amounts.

Common Stock Offering

On October 5, 2012, we completed a public offering of 4.0 million shares of our common stock at a public offering price of $7.50 per share, which was below our then current NAV per share. Gross proceeds totaled $30.0 million and net proceeds, after deducting underwriting discounts and offering expenses borne by us, were $28.3 million, which we used to repay borrowings under our Credit Facility. In connection with the offering, the underwriters exercised their option to purchase an additional 395,825 shares at the public offering price to cover over-allotments, which resulted in gross proceeds of $3.0 million and net proceeds, after deducting underwriting discounts, of $2.8 million.

Term Preferred Stock Offering

On March 6, 2012, we completed an offering of 1.4 million shares of Term Preferred Stock at a public offering price of $25.00 per share under our previous shelf registration statement on Form N-2 (File No. 333-160720). Net proceeds of the offering, after deducting underwriting discounts and offering expenses borne by us, were approximately $33.2 million, a portion of which was used to repay borrowings under our Credit Facility, with the remaining proceeds being held to make additional investments and for general corporate purposes. On March 13, 2012, the underwriters purchased an additional 0.2 million of our Term Preferred Stock to cover over-allotments, for which we received net proceeds, after deducting underwriting discounts, of $4.8 million.

Short-Term Loan

For each quarter end since December 31, 2009 (the “measurement dates”), we satisfied the 50% threshold to maintain our status as a RIC, in part, through the purchase of short-term qualified securities, which were funded primarily through a short-term loan agreement. Subsequent to each of the measurement dates, the short-term qualified securities matured, and we repaid the short-term loan, at which time we again fell below the 50% threshold.

For the March 31, 2013 measurement date, we purchased $65.0 million of short-term United States Treasury Bills (“T-Bills”) through Jefferies & Company, Inc. (“Jefferies”) on March 28, 2013. The T-Bills were purchased on margin using $7.0 million in cash and the proceeds from a $58.0 million short-term loan from Jefferies with an effective annual interest rate of approximately 1.42%. On April 4, 2013, when the T-Bills matured, we repaid the $58.0 million loan from Jefferies and received the $7.0 million margin payment sent to Jefferies to complete the transaction.

Co-Investment Order

In an order dated July 26, 2012, the SEC granted us the relief sought in the exemptive application we had previously filed with the SEC that expands our ability to co-invest with certain affiliates by permitting us, under certain circumstances, to co-invest with Gladstone Capital Corporation and any future business development company or closed-end management investment company that is advised by our Adviser (or sub-advised by the Adviser if it controls the fund) or any combination of the foregoing.

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Modification to Investment Objectives and Strategies

On September 21, 2012, our Board of Directors approved limited revisions to our investment objectives and strategies, which went into effect on January 1, 2013. All of our portfolio investments fit within the scope of our revised objectives and strategies, and no changes were made to our portfolio as a result of the revision.

Departure of Executive Officer and Director

On November 27, 2012, George Stelljes III informed the Company that he intended to resign as chief investment officer and co-vice chairman of the Board of Directors of the Company. Subsequently, his resignation became effective January 31, 2013.

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