RISK FACTORS

Investing in our common stock involves a significant degree of risk. Before deciding to invest in our common stock, you should carefully consider the risks described below, together with all other information contained in this prospectus, including our historical financial statements and accompanying notes. Any of the following risks, as well as risks that we do not know of or currently deem immaterial, could materially and adversely affect our business, financial condition, results of operations, cash flows and growth prospects. As a result, the trading price of our common stock could decline, and you could lose all or part of your investment. Further, to the extent that any of the information in this prospectus constitutes forward-looking statements, the risk factors below also are cautionary statements identifying important factors that could cause actual results to differ materially from those expressed in any forward-looking statements made by us or on our behalf. See “Special Note Regarding Forward-Looking Statements” beginning on page 32.

Risks Related to our Business

Our business strategy includes the continuation of growth plans, and our financial condition and results of operations could be negatively affected if we fail to grow or fail to manage our growth effectively.

We have grown our business largely through the acquisition of other financial institutions and through de novo branching. Since June 14, 2006, we have opened six de novo branches and acquired South Louisiana Business Bank (“SLBB”) and First Community Bank (“FCB”) by merger. We intend to continue pursuing a growth strategy for our business through de novo branching and to evaluate attractive acquisition opportunities that are presented to us. Our growth prospects must be considered in light of the risks, expenses and difficulties frequently encountered by companies when expanding their franchise, including the following:

14

Table of Contents

Failure to successfully address these issues could have a material adverse effect on our financial condition and results of operations, and could adversely affect our ability to successfully implement our business strategy. Also, if our growth occurs more slowly than anticipated or declines, our operating results could be materially adversely affected.

Our success depends significantly on our management team, and the loss of our senior executive officers or other key employees and our inability to recruit or retain suitable replacements could adversely affect our business, results of operations and growth prospects.

Our success depends significantly on the continued service and skills of our existing executive management team, particularly John J. D’Angelo, our President and Chief Executive Officer, Travis M. Lavergne, our Chief Credit Officer, Ryan P. Finnan, our Chief Operations Officer, Rachel P. Cherco, our Chief Financial Officer, Randolf F. Kassmeier, our General Counsel, and Christopher L. Hufft, our Chief Accounting Officer (whom the Bank hired on February 24, 2014). The implementation of our business and growth strategies also depends significantly on our ability to retain employees with experience and business relationships within their respective market areas, as well as on our ability to attract, motivate and retain highly qualified senior and middle management. We do not have employment agreements with any of our executive officers, and our officers may terminate their employment with us at any time. Competition for employees is intense, and we could have difficulty replacing such officers with personnel with the combination of skills and attributes required to execute our business and growth strategies and who have ties to the communities within our market areas. The loss of any of our key personnel could therefore have a material adverse effect on our business, financial condition, results of operations and growth prospects.

Our business is concentrated in southern Louisiana, and a regional or local economic downturn affecting southern Louisiana may magnify the adverse effects and consequences to us.

We conduct our operations almost exclusively in southern Louisiana, and more specifically, in the Baton Rouge, New Orleans, Lafayette and Hammond metropolitan areas. At March 31, 2014, approximately 98.41% of the secured loans in our loan portfolio are secured by properties and other collateral located in Louisiana, while approximately 73.82% of the loans in our loan portfolio (measured by dollar amount) were made to borrowers who live or work in either the Baton Rouge or New Orleans metropolitan area. This geographic concentration imposes a greater risk to us than to our competitors in the area who maintain significant operations outside of southern Louisiana. Accordingly, any regional or local economic downturn, or natural or man-made disaster, that affects southern Louisiana or existing or prospective property or borrowers in such area may affect us and our profitability more significantly and more adversely than our more geographically diversified competitors.

More particularly, much of our business development and marketing strategy is directed toward fulfilling the banking and financial services needs of small to medium-sized businesses. Such businesses generally have fewer financial resources in terms of capital or borrowing capacity than larger entities. If general economic conditions negatively impact our markets or the Louisiana market generally and these businesses are adversely affected, our financial condition and results of operations may be negatively affected.

We have a significant number of loans secured by real estate, and a downturn in the real estate market could result in losses and negatively impact our profitability.

At March 31, 2014, approximately 66.43% of our total loan portfolio had real estate as a primary or secondary component of the collateral securing the loan. The real estate provides an alternate source of repayment in the event of a default by the borrower and may deteriorate in value during the time the credit is extended. Real estate values in southern Louisiana declined in the aftermath of Hurricane Katrina in August, 2005. These values started to improve in 2006 and 2007. However, in connection with the national recession, real estate values nationally declined severely in 2008 and 2009, including in our markets. Recently, real estate values both nationally and in our markets have shown improvement. Future declines in real estate values in our southern

15

Table of Contents

Louisiana markets could significantly impair the value of the particular collateral securing our loans and our ability to sell the collateral upon foreclosure for an amount necessary to satisfy the borrower’s obligations to us. Furthermore, in a declining real estate market, we often will need to further increase our allowance for loan losses to address the deterioration in the value of the real estate securing our loans. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

Commercial real estate loans may expose us to greater risks than 1-4 family real estate loans.

Our loan portfolio includes non-owner-occupied commercial real estate loans for individuals and businesses for various purposes, which are secured by commercial properties, as well as real estate construction and development loans. As of March 31, 2014, our non-owner-occupied commercial real estate loans totaled $80.0 million, or 14.46% of our total loan portfolio. All of our non-owner-occupied commercial real estate loans were performing as of March 31, 2014.

Commercial real estate loans typically depend on cash flows from the property to service the debt. Cash flows, either in the form of rental income or the proceeds from sales of commercial real estate, may be affected significantly by general economic conditions. These loans expose a lender to greater credit risk than loans secured by residential real estate because the collateral securing these loans typically cannot be liquidated as easily as residential real estate. If we foreclose on these loans, our holding period for the collateral typically is longer than for a 1-4 family residential property because there are fewer potential purchasers of the collateral. Additionally, non-owner-occupied commercial real estate loans generally involve relatively large balances to single borrowers or related groups of borrowers. Accordingly, charge-offs on non-owner-occupied commercial real estate loans may be larger on a per loan basis than those incurred with our residential or consumer loan portfolios. Unexpected deterioration in the credit quality of our commercial real estate loan portfolio would require us to increase our provision for loan losses, which would reduce our profitability and could materially adversely affect our business, financial condition, results of operations and growth prospects.

We are exposed to consumer credit risk.

We originate a significant number of consumer installment loans, particularly with respect to automobile finance. We are subject to credit risk resulting from defaults in payment or performance by customers for our loans, as well as loans that we sell to third parties but retain servicing rights. A weak economic environment and high unemployment rates could exert pressure on our auto loan customers resulting in higher delinquencies, repossessions and losses. There can be no assurances that our monitoring of our credit risk as it affects the value of these loans and the underlying collateral will be sufficient to prevent an effect on our profitability and financial condition.

There are also risks with respect our auto lending in particular. First, as an indirect auto lender, all of our auto loans are originated by dealerships with which we have relationships. As a result, we do not have relationships directly with the borrowers and are dependent on the relationships these dealerships have with their customers to make a determination on whether or not there are factors that would cause an otherwise qualified customer to not repay the loan. In addition, federal and state laws may prohibit, limit, or delay our repossession and sale of vehicles on defaulted automobile loan contracts, which will impair our ability to recover losses on these loans. Additional factors that may affect our ability to recoup the full amount due on an indirect auto loan include, among other things, our failure to perfect our security interest in the relevant vehicle, depreciation, obsolescence, damage or loss to the vehicle and the impact of federal and state bankruptcy and insolvency laws. Furthermore, proceeds from the sale of repossessed vehicles can fluctuate significantly based upon market conditions. A deterioration in general economic conditions could result in a greater loss in the sale of repossessed vehicles than we have historically experienced.

16

Table of Contents

Our allowance for loan losses may prove to be insufficient to absorb losses inherent in our loan portfolio, and we may be required to further increase our provision for loan losses.

Although we endeavor to diversify our loan portfolio in order to minimize the effect of economic conditions within a particular industry, management also maintains an allowance for loan losses, which is a reserve established through a provision for loan losses charged to expense, to absorb probable credit losses inherent in the entire loan portfolio. We maintain our allowance for loan losses at a level considered adequate by management to absorb probable loan losses, including collateral impairment, based on our analysis of our portfolio and market environment, using relevant information available to us. Among other considerations in establishing the allowance for loan losses, management considers economic conditions reflected within industry segments, the unemployment rate in our markets, loan segmentation and historical losses that are inherent in the loan portfolio.

As of March 31, 2014, our allowance for loan losses as a percentage of total loans, net of unearned income, was 0.67% and as a percentage of total nonperforming loans was 206%. The determination of the appropriate level of the allowance is inherently subjective and requires us to make significant estimates of current credit risks and future trends, all of which are subject to material changes. In addition, loans acquired in connection with business combination transactions are measured at fair value, based on management’s estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows. Because fair value measurements incorporate assumptions regarding credit risk, no allowance for loan losses related to the acquired loans is recorded on the acquisition date.

Inaccurate management assumptions, including with respect to the fair value of acquired loans, continuing deterioration of economic conditions affecting borrowers, new information regarding existing loans, identification of additional problem loans and other factors, both within and outside of our control, may require us to increase our allowance for loan losses. In addition, bank regulatory agencies periodically review the allowance for loan losses and may require an increase in the provision for loan losses or the recognition of further loan charge-offs, based on judgments different than those of management. Finally, if actual charge-offs in future periods exceed the allowance for loan losses, we will need additional provisions to increase the allowance for loan losses. Any increases in the allowance for loan losses will result in a decrease in net income and, possibly, capital and may have a material adverse effect on our business, financial condition, results of operations and growth prospects.

Lack of seasoning of our loan portfolio could increase the risk of future credit defaults.

As a result of our growth over the past three years, a large portion of loans in our loan portfolio and of our lending relationships are of relatively recent origin. In general, loans do not begin to show signs of credit deterioration or default until they have been outstanding for some period of time, a process referred to as “seasoning.” As a result, a portfolio of older loans will usually behave more predictably than a newer portfolio. Because a large portion of our portfolio is relatively new, the current level of delinquencies and defaults may not represent the level that may prevail as the portfolio becomes more seasoned. If delinquencies and defaults increase, we may be required to increase our provision for loan losses, which could materially adversely affect our business, financial condition, results of operations and growth prospects.

We are subject to interest rate risk.

The majority of our banking assets are monetary in nature and subject to risk from changes in interest rates. Our earnings, like that of most financial institutions, are significantly dependent on our net interest income, which is the difference between our interest income on interest-earning assets, such as loans and investment securities, and our interest expense on interest-bearing liabilities, such as deposits and borrowings. We expect that we will periodically experience “gaps” in the interest rate sensitivities of our assets and liabilities, meaning that either our interest-bearing liabilities will be more sensitive to changes in market interest rates than our interest-earning assets, or vice versa. In either event, if market interest rates should move contrary to our

17

Table of Contents

position, this “gap” will negatively impact our earnings. At March 31, 2014, our interest sensitivity profile was somewhat liability sensitive, meaning that our net interest expense would increase more from rising interest rates than from falling interest rates.

Interest rates are highly sensitive to many factors that are beyond our control, including governmental monetary policies, inflation, recession, changes in unemployment, the money supply, international disorder and instability in domestic and foreign financial markets. Changes in monetary policy, including changes in interest rates, could influence not only the interest we receive on loans and securities and the interest we pay on deposits and borrowings, but such changes could also affect our ability to originate loans and obtain deposits, the fair value of our financial assets and liabilities and the average duration of our assets. Any substantial, unexpected, prolonged change in market interest rates could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

In addition, as interest rates increase, the ability of borrowers to repay their current loan obligations could be negatively impacted, which would adversely affect our results of operations. These circumstances could not only result in increased loan defaults, foreclosures and charge-offs but also necessitate further increases to the allowance for loan losses. At the same time, the marketability of the property securing a loan may be adversely affected by any reduced demand resulting from higher interest rates. Further, when we place a loan on nonaccrual status, we reverse any accrued but unpaid interest receivable, which decreases interest income, but we continue to have a cost to fund the loan, which is reflected as interest expense, without any interest income to offset the associated funding expense. Thus, an increase in the amount of nonperforming assets would have an adverse impact on net interest income. On the other hand, in a declining interest rate environment, there may be an increase in prepayments on loans as borrowers refinance their loans at lower rates.

If short-term interest rates remain at their historically low levels for a prolonged period, and assuming longer term interest rates fall further, we could experience net interest margin compression as our interest earning assets would continue to reprice downward while our interest-bearing liability rates could fail to decline in tandem. Such an occurrence would have a material adverse effect on our net interest income and our results of operations.

If we fail to maintain an effective system of internal control over financial reporting, we may not be able to accurately report our financial results. As a result, current and potential shareholders could lose confidence in our financial reporting which would harm our business and the trading price of our securities.

As a public company, our management is responsible for establishing and maintaining adequate internal control over financial reporting and for evaluating and reporting on that system of internal control. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. We are currently in the process of establishing a system of internal control over financial reporting that will enable us to comply with our obligations under the federal securities laws and other applicable legal requirements. As an emerging growth company, we are exempt from the requirement under the Sarbanes-Oxley Act of 2002 to obtain an attestation report from our auditors on management’s assessment of our internal control over financial reporting, and we have not received such a report.

In connection with the preparation of our financial statements for the year ended December 31, 2013, we identified significant deficiencies in our internal control over financial reporting related to complex accounting transactions and financial closing matters. A significant deficiency is a deficiency, or a combination of deficiencies, in internal control over financial reporting that is less severe than a material weakness yet important enough to merit attention by those responsible for oversight of our financial reporting. At the direction of our senior management, we have taken what we believe are the appropriate actions to remediate these significant deficiencies, including, among other things, hiring additional accounting personnel, using outside accountants and consultants to supplement our internal staff and improving our internal control procedures. We will continue

18

Table of Contents

to periodically test and update our internal control systems, including our financial reporting controls, but we can give no assurances that our actions will be sufficient to result in an effective internal control environment.

If we are unable to implement and maintain our system of internal control over financial reporting free from material weaknesses or are otherwise unable to comply in a timely manner with the requirements under federal law and regulations with respect our internal control over financial reporting, we may not be able to report our financial results accurately and timely. As a result, investors, counterparties and customers may lose confidence in the accuracy and completeness of our financial reports. In addition, we could become subject to investigations by the stock exchange on which our securities are listed, the SEC or other regulatory authorities, which could require additional financial and management resources. As a result of these investigations, we could be required to implement expensive and time-consuming remedial measures, including the potential delisting of our securities from the Nasdaq Global Market. Any of these events could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

Hurricanes or other adverse weather conditions, as well as man-made disasters, could negatively affect our local markets or disrupt our operations, which may adversely affect our business and results of operations.

Our business is concentrated in southern Louisiana, and in the Baton Rouge, New Orleans, Lafayette and Hammond metropolitan areas in particular. Southern Louisiana is susceptible to major hurricanes, floods, tropical storms and other natural disasters and adverse weather. These natural disasters can disrupt our operations, cause widespread property damage and severely depress the local economies in which we operate. For example, Hurricane Gustav in 2008 severely impacted our headquarters city of Baton Rouge, with power in many areas of the city not being restored for nearly three weeks after the hurricane. The 2010 Deepwater Horizon oil spill in the Gulf of Mexico illustrates that man-made disasters can also adversely affect economic activity in the markets in which we operate. Any economic decline as a result of a natural disaster, adverse weather, oil spill or other man-made disaster can reduce the demand for loans and our other products and services.

Such events could also affect the stability of our deposit base, impair the ability of borrowers to repay outstanding loans (resulting in increased delinquencies, foreclosures and loan losses), impair the value of collateral securing such loans, cause significant property damage, result in loss of revenue and/or cause us to incur additional expenses. The occurrence of any such event could, therefore, result in decreased revenue and loan losses that have a material adverse effect on our business, financial condition, results of operations and growth prospects.

We are subject to a variety of risks in connection with any sale of loans we may conduct.

As discussed elsewhere in this prospectus, we sell certain mortgage loans that we originate as well as pools of our auto loans. In connection with these sales, we are typically required to make representations and warranties to the purchaser about the loans sold and the procedures under which those loans have been originated. If these representations and warranties are incorrect, we may be required to indemnify the purchaser for its losses or we may be required to repurchase part or all of the affected loans. Borrower fraud may also cause us to have to repurchase loans that we have sold. If we are required to make any indemnity payments or repurchases and do not have a remedy available to us against a solvent counterparty, we may not be able to recover our losses resulting from these indemnity payments and repurchases. Consequently, our results of operations may be adversely affected.

Federal Reserve quantitative easing and other government programs designed to support the economy could result in inflation and other adverse effects on the economy in general and financial institutions in particular.

It is currently a matter of significant debate among economists, governmental banking agencies and others regarding the likelihood of significant inflation across some or all asset classes, both in the United States and in the global economy. Some policymakers have taken the position that an increase in inflation will be beneficial, rather than harmful, to the U.S. economy. If governmental policies or general market factors result in an increase

19

Table of Contents

in inflation, such increase could significantly affect our profitability and operations. We expect the Board of Governors of the Federal Reserve System, or the Federal Reserve, to continue to support the growth of the money supply in the United States by keeping the Federal funds rate low and by continuing to purchase a substantial amount of U.S. Treasuries and other debt securities (referred to as “quantitative easing”), although the level of purchases has begun to be gradually reduced. If the U.S. economy continues to demonstrate weakness or only sluggish growth in upcoming periods, it seems likely that at least some level of monetary easing will continue for a protracted period. If this occurs, an increase in inflation will become more likely, and any such increase will place significant pressure on bank deposit levels, which may have a material adverse effect on all financial institutions, including the Bank.

Factors outside our control could result in impairment of or losses with respect to our investment securities.

There are many factors beyond our control that can significantly influence, and adversely change, the fair value of the securities in our portfolio. Factors include, for example, rating agency downgrades of the securities, defaults by the issuer or continued instability in the capital markets. Any of these factors, among others, could cause other-than-temporary impairments and realized and/or unrealized losses in future periods and declines in other comprehensive income, which could materially and adversely affect our business, results of operations, financial condition and growth prospects. The process for determining whether impairment of a security is other-than-temporary usually requires difficult, subjective judgments about the future financial performance and liquidity of the issuer and any collateral underlying the security in order to assess the probability of receiving all contractual principal and interest payments on the security.

We may need to raise additional capital in the future to execute our business strategy.

In addition to the liquidity that we require to conduct our day-to-day operations, the Company, on a consolidated basis, and Investar Bank, on a stand-alone basis, must meet certain regulatory capital requirements. With the implementation of certain new regulatory requirements, such as the Basel III accord and the capital requirements enacted under the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, or the Dodd-Frank Act, financial institutions may be required to establish higher tangible capital requirements. Also, we may need capital to finance acquisitions.

Our ability to raise additional capital depends on conditions in the capital markets, economic conditions and a number of other factors, including investor perceptions regarding the banking industry, market conditions and governmental activities, and on our financial condition and performance. Accordingly, we cannot assure you that we will be able to raise additional capital if needed or on terms acceptable to us. If we fail to maintain capital to meet regulatory requirements, our business, financial condition, results of operations and growth prospects could be materially and adversely affected.

Competition in our industry is intense, which could adversely affect our growth and profitability.

We face substantial competition in all areas of our operations from a variety of different competitors, many of which are larger and have substantially greater resources than we have, including higher total assets and capitalization, a more extensive and established branch network, greater access to capital markets and a broader offering of financial services. Such competitors primarily include national, regional and community banks within the various markets in which we operate. Because of their scale, many of these competitors can be more aggressive than we can on loan and deposit pricing. We also face competition from many other types of financial institutions, including savings and loans, credit unions, finance companies, brokerage firms, insurance companies, factoring companies and other financial intermediaries. Many of these entities have fewer regulatory constraints and may have lower cost structures than we do.

Our industry could become even more competitive as a result of legislative and regulatory changes as well as continued consolidation. The increased regulatory requirements imposed on financial institutions as well as the economic downturn in the United States have already resulted in the consolidation of a number of financial

20

Table of Contents

institutions, in addition to acquisitions of failed institutions. We expect additional consolidation to occur. Finally, technology has lowered barriers to entry and made it possible for non-banks to offer products and services traditionally provided by banks, such as automatic transfer and automatic payment systems. If we are unable to successfully compete, our business, financial condition, results of operations and growth prospects will be materially adversely affected.

We may fail to realize the anticipated benefits of our recent acquisitions.

The success of our recent acquisitions of SLBB and FCB will depend on a number of factors, including, as to each acquisition, the following:

If we are not able to successfully achieve these objectives, the anticipated benefits of the acquisitions may not be realized fully or at all or may take longer to realize than expected. For example, we may experience increased credit costs or need to take additional markdowns and make additional provisions to the allowance for loan losses on the loans acquired from SLBB and FCB, which would reduce the benefits of the applicable acquisition. Additionally, we have made fair value estimates of certain assets and liabilities in recording each acquisition. Actual values of these assets and liabilities could differ from our estimates, which could result in our not achieving the anticipated benefits of the particular acquisition.

Any of these factors could adversely affect our financial condition and results of operations in the future.

If the goodwill that we recorded in connection with a business acquisition becomes impaired, it could require charges to earnings, which would have a negative impact on our financial condition and results of operations.

Goodwill represents the amount by which the cost of an acquisition exceeded the fair value of net assets we acquired in connection with the purchase of another financial institution. We review goodwill for impairment at least annually, or more frequently if events or changes in circumstances indicate that the carrying value of the asset might be impaired.

We determine impairment by comparing the implied fair value of the reporting unit goodwill with the carrying amount of that goodwill. If the carrying amount of the reporting unit goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to that excess. Any such adjustments are reflected in our results of operations in the periods in which they become known. As of March 31, 2014, our goodwill totaled $2.7 million. While we have not recorded any such impairment charges since we initially recorded the goodwill, there can be no assurance that our future evaluations of goodwill will not result in findings of impairment and related write-downs, which may have a material adverse effect on our financial condition and results of operations.

We may face risks with respect to future acquisitions.

When we attempt to expand our business in Louisiana and other states through mergers and acquisitions, we seek targets that are culturally similar to us, have experienced management and possess either significant market presence or have potential for improved profitability through economies of scale or expanded services. In addition to the general risks associated with our growth plans highlighted above, acquiring other banks, businesses or branches involves various risks commonly associated with acquisitions, including, among other things:

21

Table of Contents

With respect to the risks particularly associated with the integration of an acquired business, we may encounter a number of difficulties, such as:

In addition to the risks posed by the integration process itself, the focus of management’s attention and effort on integration may result in a lack of sufficient management attention to other important issues, causing harm to our business. Also, general market and economic conditions or governmental actions affecting the financial industry generally may inhibit our successful integration of an acquired business.

We expect to continue to evaluate merger and acquisition opportunities that are presented to us and conduct due diligence activities related to possible transactions with other financial institutions. As a result, merger or acquisition discussions and, in some cases, negotiations may take place and future mergers or acquisitions involving cash, debt or equity securities may occur at any time. Historically, acquisitions of non-failed financial institutions involve the payment of a premium over book and market values, and, therefore, some dilution of our book value and net income per share may occur in connection with any future transaction. Failure to realize the expected revenue increases, cost savings, increases in geographic or product presence and/or other projected benefits from an acquisition could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

The obligations associated with being a public company will require significant resources and management attention, which will increase our costs of operations and may divert focus from our business operations.

We have not been required in the past to file periodic reports with the Securities and Exchange Commission, or the SEC, or to have our consolidated financial statements completed, reviewed or audited and filed prior to a specified deadline. As a publicly traded company following completion of this offering, we will be required to file periodic reports containing our consolidated financial statements with the SEC within a specified time following the completion of quarterly and annual periods. There are also significant financial, legal, accounting,

22

Table of Contents

insurance and other expenses associated with being a public company in addition to the costs associated with complying with the SEC’s reporting requirements. Not only will meeting our obligations as a public company result in our incurrence of additional costs, but they will also occupy a material portion of management’s time that would have been used to implement our growth strategy and other strategic initiatives and otherwise manage our day-to-day operations. Although we cannot predict or estimate the amount of additional costs we may incur in order to comply with our obligations as a public company, we anticipate that these costs will materially increase our general and administrative expenses.

As a business operating in the financial services industry, our business and operations may be adversely affected by current economic conditions.

General business and economic conditions in the United States and abroad can materially affect our business and operations. A weak U.S. economy is likely to cause uncertainty about the federal fiscal policymaking process, the medium and long-term fiscal outlook of the federal government and future tax rates. In addition, economic conditions in foreign countries, including uncertainty over the stability of the euro currency, could affect the stability of global financial markets, which could hinder U.S. economic growth.

Weak economic conditions are characterized by deflation, fluctuations in debt and equity capital markets, a lack of liquidity and/or depressed prices in the secondary market for mortgage loans, increased delinquencies on mortgage, consumer and commercial loans, residential and commercial real estate price declines and lower home sales and commercial activity. The current economic environment in the United States is also characterized by interest rates at historically low levels, which impacts our ability to attract deposits and to generate attractive earnings through our investment portfolio. All of these factors are detrimental to our business, and the interplay between these factors can be complex and unpredictable. Our business is also significantly affected by monetary and related policies of the U.S. federal government and its agencies. Changes in any of these policies are influenced by macroeconomic conditions and other factors that are beyond our control. Adverse economic conditions and government policy responses to such conditions could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

A lack of liquidity could adversely affect our ability to fund operations and meet our obligations as they become due.

Liquidity is essential to our business. Liquidity risk is the potential that we will be unable to meet our obligations as they come due because of an inability to liquidate assets or obtain adequate funding. The primary source of the Bank’s funds are customer deposits and loan repayments, while borrowings are a secondary source of liquidity. Our access to deposits and other funding sources in adequate amounts and on acceptable terms is affected by a number of factors, including rates paid by competitors, returns available to customers on alternative investments and general economic conditions. Any decline in available funding could adversely impact our ability to originate loans, invest in securities, meet our expenses, pay dividends to our shareholders, or to fulfill obligations such as repaying our borrowings or meeting deposit withdrawal demands, any of which could have a material adverse impact on our business, financial condition, results of operations and growth prospects.

We rely on information technology and telecommunications systems and third party vendors, and our failure to effectively implement new technology or a breach, computer virus or disruption of service could adversely affect our operations and financial condition.

Our industry is undergoing rapid technological changes with frequent introductions of new technology-driven products and services. We believe that improved technology allows us to serve our customers in a more efficient and less costly manner. Our ability to compete successfully to some extent depends on whether we can implement new technologies to provide products and services to our customers while avoiding significant operational challenges that increase our costs or delay full implementation of technology enhancements or new products, especially relative to our peers (many of which have greater resources to devote to technological improvements).

23

Table of Contents

Although new technologies enable us to enhance the products and services we offer our customers, this technology exposes us to certain risks. First, the successful and uninterrupted functioning of our information technology and telecommunications systems is critical to our business. We outsource many of our major systems, such as data processing, loan servicing and deposit processing. If one of these third-party service providers terminates their relationship with us or fails to provide services to us for any reason or provides such services poorly, our business will be negatively affected. In addition, we may be forced to replace such vendor, which could interrupt our operations and result in a higher cost to us.

Another risk associated with our reliance on technology is our potential vulnerability to security breaches, denial of service attacks, viruses, worms and other disruptive problems caused by hackers as well as to damage from physical theft, fire, power loss, telecommunications failure or a similar catastrophic event. We have attempted to address these concerns by backing up our systems as well as retaining qualified third party vendors to test and audit our network. However, there can be no guarantees that our efforts will continue to be successful in avoiding problems with our information technology and telecommunications systems. If our efforts are unsuccessful, security breaches, viruses and other technology disruptions could expose us to claims, regulatory scrutiny, litigation and other possible liabilities, in addition to a loss of the confidence of our existing customers in the reliability of our systems.

We are subject to environmental liability risk associated with our lending activities.

A significant portion of our loan portfolio is secured by real property. Also, in the ordinary course of business, we may foreclose on and take title to properties securing certain loans or purchase real estate to expand our facilities. In doing so, there is a risk that hazardous or toxic substances could be found on these properties. If hazardous or toxic substances are found, we may be liable for remediation costs, as well as for personal injury and property damage. Environmental laws may require us to incur substantial expenses and may materially reduce the affected property’s value or limit our ability to use or sell the affected property. The remediation costs and any other financial liabilities associated with an environmental hazard could have a material adverse effect on our business, financial condition, results of operations and growth prospects. In addition, future laws or more stringent interpretations or enforcement policies with respect to existing laws may increase our exposure to environmental liability. Although management has policies and procedures to perform an environmental review before the loan is recorded and before initiating any foreclosure action on real property, these reviews may not be sufficient to detect all potential environmental hazards.

Risks Related to Our Industry

We operate in a highly regulated environment, which could restrain our growth and profitability.

We are subject to extensive regulation and supervision that governs almost all aspects of our operations, including, among other things, our lending practices, capital structure, investment practices, dividend policy, operations and growth. These laws and regulations, and the supervisory framework that oversees the administration of these laws and regulations, are primarily intended to protect consumers, depositors, the Deposit Insurance Fund and the banking system as a whole, and not shareholders and counterparties. Furthermore, new proposals for legislation continue to be introduced in the U.S. Congress that could further substantially increase regulation of the financial services industry, impose restrictions on our operations and our ability to conduct business consistent with historical practices, including in the areas of compensation, interest rates, financial product offerings and disclosures, and have an effect on bankruptcy proceedings with respect to consumer residential real estate mortgages, among other things. Finally, after the completion of this offering, we will be subject to additional laws, regulations and standards relating to corporate governance and public disclosure, including the Sarbanes-Oxley Act of 2002 and SEC regulations.

Our efforts to comply with these additional laws, regulations and standards are likely to result in increased expenses and a diversion of management time and attention. The information under the heading Supervision and

24

Table of Contents

Regulation beginning on page 87 of this prospectus provides more information regarding the regulatory environment in which we and Investar Bank operate.

Financial reform legislation enacted by Congress will, among other things, tighten capital standards and result in new laws and regulations that likely will increase our costs of operations.

The Dodd-Frank Act was signed into law on July 21, 2010. This law significantly changed the then-existing bank regulatory structure and affected the lending, deposit, investment, trading and operating activities of financial institutions and their holding companies. The Dodd-Frank Act changes the regulatory structure to which we are subject in numerous ways, including, but not limited to, the following:

Our management continues to assess the impact on our operations of the Dodd-Frank Act and its regulations, many of which have yet to be proposed or adopted or are to be phased-in over the next several months and years. Because the impact of many of the regulations adopted pursuant to the Dodd-Frank Act’s may not be known for some time, it is difficult to predict at this time what specific impact the Dodd-Frank Act will have on us. However, it is expected that at a minimum our operating and compliance costs will increase, and our interest expense could increase.

In addition to the foregoing, the Dodd-Frank Act established the Bureau of Consumer Financial Protection (the “CFPB”) as an independent entity within the Federal Reserve. The CFPB has broad rulemaking, supervisory and enforcement authority over consumer financial products and services, including deposit products, residential mortgages, home-equity loans and credit cards, as well as with respect to certain mortgage-related matters, such as steering incentives, determinations as to a borrower’s ability to repay and prepayment penalties. In March, 2013, the CFPB issued a bulletin indicating its intention to review the policies and practices of indirect auto lenders with regard to pricing activities and advising auto lenders to take appropriate steps to ensure compliance with the fair lending provision of the Equal Credit Opportunity Act, or the ECOA. Additionally, the CFPB has begun investigating indirect auto lenders over the sale and financing of extended warranties and other add-on products. Although we believe our auto lending practices comply with existing law and regulation, new rulemaking by the CFPB as well enforcement actions it brings to enforce the ECOA or other laws within its jurisdiction, if applicable to the Bank, could require us to cease or alter our auto lending practices, which in turn could have a material adverse effect on our business, results of operations, financial condition and growth prospects.

Federal and state regulators periodically examine our business, and we may be required to remediate adverse examination findings.

The Federal Reserve, the FDIC and the Louisiana Office of Financial Institutions, or the OFI, periodically examine our business, including our compliance with laws and regulations. If, as a result of an examination, a

25

Table of Contents

federal banking agency were to determine that our financial condition, capital resources, asset quality, earnings prospects, management, liquidity or other aspects of any of our operations had become unsatisfactory, or that we were in violation of any law or regulation, it may take a number of different remedial actions as it deems appropriate. These actions include the power to enjoin “unsafe or unsound” practices, to require affirmative action to correct any conditions resulting from any violation or practice, to issue an administrative order that can be judicially enforced, to direct an increase in our capital, to restrict our growth, to assess civil monetary penalties against our officers or directors, to remove officers and directors and, if it is concluded that such conditions cannot be corrected or there is an imminent risk of loss to depositors, to terminate our deposit insurance and place us into receivership or conservatorship. If we become subject to any regulatory actions, it could have a material adverse effect on our business, results of operations, financial condition and growth prospects.

We may be required to pay significantly higher FDIC deposit insurance premiums in the future.

The deposits of Investar Bank are insured by the FDIC up to legal limits and, accordingly, subject it to the payment of FDIC deposit insurance assessments. A bank’s regular assessments are determined by its risk classification, which is based on its regulatory capital levels and the level of supervisory concern that it poses. Recent insured depository institution failures, as well as deterioration in banking and economic conditions generally, have significantly increased the losses of the FDIC, resulting in a decline in the designated reserve ratio of the FDIC to historical lows. To restore this reserve ratio and bolster its funding position, the FDIC imposed a special assessment on depository institutions and also increased deposit insurance assessment rates. Further increases in assessment rates are possible in the future, especially if there are additional bank failures. Any increase in deposit insurance assessment rates, or any future special assessment, could materially and adversely affect our business, results of operations, financial condition and growth prospects.

The short-term and long-term impact of the new regulatory capital rules is uncertain.

In July 2013, each of the U.S. federal banking agencies adopted final rules implementing the recommendations of the International Basel Committee on Bank Supervision to strengthen the regulatory capital requirements of all banking organizations in the United States. The new capital framework, referred to as Basel III, will replace the existing regulatory capital rules for all banks, savings associations and U.S. bank holding companies with greater than $500 million in total assets, and all savings and loan holding companies. The final Basel III rules became effective on January 1, 2014, although the Company and Investar Bank will not be required to be in compliance with the final Basel III rules until January 1, 2015, and the rules will not be fully phased-in until January 1, 2019.

Basel III creates a new regulatory capital standard based on tier 1 common equity and increases the minimum leverage and risk-based capital ratios applicable to all banking organizations. Basel III also changes how a number of the regulatory capital components are calculated. We cannot predict whether the proposed rules will be adopted in the form proposed or if they will be modified in any material way during the rulemaking process. Consequently, the ultimate timing and scope of any U.S. implementation of Basel III remains uncertain. However, any significant increase in our capital requirement could reduce our growth and profitability and materially adversely affect our business, financial condition, results of operations and growth prospects.

We are subject to numerous laws designed to protect consumers, including the Community Reinvestment Act and fair lending laws, and failure to comply with these laws could lead to a wide variety of sanctions.

The Community Reinvestment Act, or CRA, the ECOA, the Fair Housing Act and other fair lending laws and regulations impose nondiscriminatory lending requirements on financial institutions. The Department of Justice and other federal agencies enforce these laws and regulations, but private parties may also have the ability to challenge an institution’s performance under fair lending laws in private class action litigation. If an institution’s performance under the Community Reinvestment Act or fair lending laws and regulations is found

26

Table of Contents

to be deficient, the institution could be subject to damages and civil money penalties, injunctive relief, restrictions on mergers and acquisitions activity, restrictions on expansion and restrictions on entering new business lines, among other sanctions. In addition, the FDIC’s assessment of our compliance with CRA provisions is taken into account when evaluating any application we submit for, among other things, approval of the acquisition or establishment of a branch or other deposit facility, an office relocation, a merger or the acquisition of another financial institution. Our failure to satisfy our CRA obligations could, at a minimum, result in the denial of such applications and limit our growth.

We face a risk of noncompliance and enforcement action with the Bank Secrecy Act and other anti-money laundering statutes and regulations.

The Bank Secrecy Act, the USA PATRIOT Act of 2001, and other laws and regulations require financial institutions, among other duties, to institute and maintain an effective anti-money laundering program and file suspicious activity and currency transaction reports as appropriate. The federal Financial Crimes Enforcement Network is authorized to impose significant civil money penalties for violations of those requirements and has recently engaged in coordinated enforcement efforts with the individual federal banking regulators, as well as the U.S. Department of Justice, Drug Enforcement Administration and Internal Revenue Service. We are also subject to increased scrutiny of compliance with the rules enforced by the Office of Foreign Assets Control. If our policies, procedures and systems are deemed deficient, we would be subject to liability, including fines and regulatory actions, which may include restrictions on our ability to pay dividends and the necessity to obtain regulatory approvals to proceed with certain aspects of our business plan, including our acquisition plans. Failure to maintain and implement adequate programs to combat money laundering and terrorist financing could also have serious reputational consequences for us. Any of these results could materially and adversely affect our business, financial condition, results of operations and growth prospects.

Risks Related to an Investment in our Common Stock

An active, liquid market for our common stock may not develop or be sustained following the offering, and you may not be able to sell your common stock when or in the amounts you wish to.

Prior to this offering, there has been no established public trading market for our common stock. We have applied to list our common stock on the Nasdaq Global Market, but our application may not be approved. Even if approved, an active trading market for shares of our common stock may not develop or be sustained following the offering. A public trading market having the desired characteristics of depth, liquidity and orderliness depends upon the presence in the marketplace and willing buyers and sellers of our common stock, over which we have no control. If an active market does not develop, shareholders may not be able to sell their shares at the volume, prices and times desired. The initial public offering price for our common stock will be determined by negotiations between us and the representative of the underwriters. The price may not be indicative of prices that will prevail in the open market after this offering. The market price of our common stock may decline below the initial offering price, and you may not be able to sell your common stock at or above the price you paid in this offering, or at all. An inactive market may also impair our ability to raise capital by selling our common stock and may impair our ability to expand our business by using our common stock as consideration.

The market price of our common stock may be volatile following this offering, and our stock price may fall below the initial public offering price at the time you desire to sell your shares of our common stock, resulting in a loss on your investment.

The market price of our common stock may fluctuate substantially due to a variety of factors, many of which are beyond our control, including, without limitation:

27

Table of Contents

The stock market and, in particular, the market for financial institution stocks have experienced significant fluctuations in recent years. In many cases, these changes have been unrelated to the operating performance and prospects of particular companies. In addition, significant fluctuations in the trading volume in our common stock may cause significant price variations to occur. Increased market volatility may materially and adversely affect the market price of our common stock, which may make it difficult for you to resell your shares at the volume, prices and times desired.

We are an “emerging growth company,” and we cannot be certain if the reduced reporting requirements applicable to emerging growth companies will make our common stock less attractive to investors.

We are an “emerging growth company,” as defined in the JOBS Act. While we retain this status, we intend to take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies, including reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. See Implications of Being an Emerging Growth Company on page 1 of this prospectus. We cannot predict if investors will find our common stock less attractive because we may rely on these exemptions, or if we choose to rely on additional exemptions in the future. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be more volatile.

Investors in this offering will experience immediate dilution as a result of this offering.

If you purchase common stock in this offering, you will pay more for your shares than the tangible book value per share of our common stock immediately following this offering. As a result, you will experience immediate dilution in tangible book value per share in relation to the price that you paid for your shares. We expect the dilution as a result of the offering to be $ — per share, based on an assumed initial offering price of $ —  per share (the midpoint of the range set forth on the cover page of this prospectus) and our pro forma net tangible book value of $ — per share as of March 31, 2014. This represents — % dilution from the initial public offering price. For a further discussion of the dilution you will experience immediately after this offering, see the Dilution section beginning on page 37 of this prospectus.

28

Table of Contents

Shares eligible for future sale could have a dilutive effect.

Shares of our common stock eligible for future sale, including those that may be issued in any other private or public offering of our common stock for cash or as incentives under incentive plans, could have a dilutive effect on the market for our common stock and could adversely affect market prices. All of the shares of common stock sold in this offering (including — additional shares if the underwriters exercise their purchase option in full) will be freely tradable, except that any shares purchased by “affiliates” (as that term is defined in Rule 144 under the Securities Act of 1933, as amended, or the Securities Act) may be sold publicly only in compliance with the limitations described under the heading Shares Eligible For Future Sale beginning on page 119 of this prospectus. The remaining — million outstanding shares of our common stock, or — % of our outstanding shares, will be deemed to be “restricted securities” as that term is defined in Rule 144, and may be sold in the market over time in private transactions or future public offerings. We also intend to file a registration statement on Form S-8 under the Securities Act to register an aggregate of approximately — million shares of common stock issued or reserved for future issuance under our Equity Incentive Plan. We may issue all of these shares without any action or approval by our shareholders, and these shares, once issued (including upon exercise of outstanding options), will be available for sale into the public market, subject to the restrictions described above, if applicable, for affiliate holders.

Our management will have broad discretion in the use of the net proceeds from this offering, and the use of such proceeds may not yield a favorable return on your investment.

We expect to use the net proceeds of this offering for general working capital and other corporate purposes, which may include, among other things, funding loans and purchasing investment securities through the Bank. We may also use the net proceeds to fund acquisition opportunities, although we have no present plans in that regard. You may not agree with how our management ultimately decides to use the proceeds of this offering. In addition, we may not use the proceeds of this offering effectively or in a manner that increases our market value or enhances our profitability. There is no set timetable for when we will deploy the proceeds, and we cannot predict this timetable. Investing the offering proceeds in securities until we are able to deploy the proceeds will provide lower margins than we generally earn on loans, potentially adversely affecting shareholder returns, including earnings per share, return on assets and return on equity. See the Use of Proceeds section on page 33 of this prospectus.

Our dividend policy may change without notice, and our future ability to pay dividends is subject to restrictions.

Holders of our common stock are entitled to receive only such cash dividends as our board of directors may declare out of funds legally available for the payment of dividends. Although prior to the Share Exchange Investar Bank paid dividends to its shareholders over the past two years and after the Share Exchange the Company paid a dividend to its shareholders on January 31, 2014, we have no obligation to continue paying dividends, and we may change our dividend policy at any time without notice to our shareholders. As of the date of this prospectus, our intention is to pay a quarterly cash dividend after the offering.

Since the Company’s primary asset is its stock of Investar Bank, we are dependent upon dividends from the Bank to pay our operating expenses, satisfy our obligations and to pay dividends on the Company’s common stock. Accordingly, any declaration and payment of dividends on common stock will substantially depend upon the Bank’s earnings and financial condition, liquidity and capital requirements, the general economic and regulatory climate and other factors deemed relevant by our board of directors. Furthermore, consistent with our strategic plans, growth initiatives, capital availability, projected liquidity needs, and other factors, we have made, and will continue to make, capital management decisions and policies that could adversely impact the amount of dividends, if any, paid to our shareholders.

In addition, there are numerous laws and banking regulations that limit our and Investar Bank’s ability to pay dividends. For Investar Bank, federal and state statutes and regulations require, among other things, that the

29

Table of Contents

Bank maintain certain levels of capital in order to pay a dividend. Further, state and federal banking authorities have the ability to restrict the payment of dividends by supervisory action. At the holding company level, the Federal Reserve Board has indicated that bank holding companies should carefully review their dividend policy in relation to the organization’s overall asset quality, level of current and prospective earnings and level, composition and quality of capital. The guidance requires that a company inform and consult with the Federal Reserve Board prior to declaring and paying a dividend that exceeds earnings for the period for which the dividend is being paid or that could result in an adverse change to its capital structure.

For additional information, refer to the information under the heading Dividend Policy beginning on page 34 of this prospectus.

Our Restated Articles of Incorporation and By-laws, and certain banking laws applicable to us, could have an anti-takeover effect that decreases our chances of being acquired, even if our acquisition is in our shareholders’ best interests.

Certain provisions of our restated articles of incorporation and by-laws, and federal banking laws, including regulatory approval requirements, could make it more difficult for a third party to acquire control of our organization or conduct a proxy contest, even if those events were perceived by many of our shareholders as beneficial to their interests. These provisions, and the corporate and banking laws and regulations applicable to us:

These provisions may discourage potential acquisition proposals and could delay or prevent a change in control, including circumstances in which our shareholders might otherwise receive a premium over the market price of our shares.

Our issuance of preferred stock could adversely affect holders of our common stock and discourage a takeover.

Our shareholders authorized our board of directors to issue up to 5,000,000 shares of preferred stock without any further action on the part of our shareholders. The board also has the power, without shareholder approval, to set the terms of any series of preferred stock that may be issued, including voting rights, dividend rights, preferences over our common stock with respect to dividends or in the event of a dissolution, liquidation or winding up and other terms. In the event that we issue preferred stock in the future that has preference over our common stock with respect to payment of dividends or upon our liquidation, dissolution or winding up, or if we issue preferred stock with voting rights that dilute the voting power of our common stock, the rights of the holders of our common stock or the market price of our common stock could be adversely affected. In addition, the ability of our board of directors to issue shares of preferred stock without any action on the part of our shareholders may impede a takeover of us and prevent a transaction perceived to be favorable to our shareholders.

30

Table of Contents

Holders of the junior subordinated debentures have rights that are senior to those of our common shareholders.

We assumed junior subordinated debentures in connection with the FCB acquisition. At March 31, 2014, we had trust preferred securities and accompanying junior subordinated debentures with a carrying value of $3.6 million. Payments of the principal and interest on the trust preferred securities of these trusts are conditionally guaranteed by us. Further, the junior subordinated debentures we issued to the trusts are senior to our shares of common stock. As a result, we must make payments on the junior subordinated debentures before any dividends can be paid on our common stock and, in the event of our bankruptcy, dissolution or liquidation, the holders of the junior subordinated debentures must be satisfied before any distributions can be made on our common stock. We have the right to defer distributions on our junior subordinated debentures (and the related trust preferred securities) for up to five years, during which time no dividends may be paid on our common stock.

An investment in our common stock is not an insured deposit and is subject to risk of loss.

Your investment in our common stock will not be a bank deposit and will not be insured or guaranteed by the FDIC or any other government agency. Your investment will be subject to investment risk, and you must be capable of affording the loss of your entire investment.

31

Table of Contents