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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

Commission file number: 001-35826

(414) 390-6100

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þ No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes o No þ

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes þ No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

The aggregate market value of common equity held by non-affiliates of the registrant at June 29, 2018, which was the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $1,614,293,320 based on the closing price of $30.15 for one share of Class A common stock, as reported on the New York Stock Exchange on that date. For purposes of this calculation only, it is assumed that the affiliates of the registrant include only directors and executive officers of the registrant.

The number of outstanding shares of the registrant’s Class A common stock, par value $0.01 per share, Class B common stock, par value $0.01 per share, and Class C common stock, par value $0.01 per share, as of February 14, 2019 were 54,063,445, 8,645,249 and 14,226,435, respectively.

TABLE OF CONTENTS

Except where the context requires otherwise, in this report:

Forward-Looking Statements

This report contains, and from time to time our management may make, forward-looking statements within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. Statements regarding future events and our future performance, as well as management’s current expectations, beliefs, plans, estimates or projections relating to the future, are forward-looking statements within the meaning of these laws. In some cases, you can identify these statements by forward-looking words such as “may”, “might”, “will”, “should”, “expects”, “intends”, “plans”, “anticipates”, “believes”, “estimates”, “predicts”, “potential” or “continue”, the negative of these terms and other comparable terminology. Forward-looking statements are only predictions based on current expectations and projections about future events. Forward-looking statements are subject to a number of risks and uncertainties, and there are important factors that could cause actual results, level of activity, performance, actions or achievements to differ materially from the results, level of activity, performance, actions or achievements expressed or implied by the forward-looking statements. These factors include: the loss of key investment professionals or senior management, adverse market or economic conditions, poor performance of our investment strategies, change in the legislative and regulatory environment in which we operate, operational or technical errors or other damage to our reputation and other factors disclosed in the Company’s filings with the Securities and Exchange Commission, including those factors listed under the caption entitled “Risk Factors” in Item 1A of this Form 10-K. We undertake no obligation to publicly update any forward-looking statements in order to reflect events or circumstances that may arise after the date of this report, except as required by law.

Forward-looking statements include, but are not limited to, statements about:

Performance and Assets Under Management Information Used in this Report

We manage investments primarily through pooled investment funds and separate accounts. We serve as investment adviser to Artisan Funds and as investment manager of Artisan Global Funds. We refer to funds and other accounts that are managed by us with a broadly common investment objective and substantially in accordance with a single model account as being part of the same investment “strategy”.

We measure the results both of our individual funds and of our “composites”, which represent the aggregate performance of all discretionary client accounts, including funds, invested in the same strategy, except those accounts with respect to which we believe client-imposed investment restrictions (such as socially-based restrictions) may have a material impact on portfolio construction and those accounts managed in a currency other than U.S. dollars (the results of these excluded accounts, which represented approximately 11% of our assets under management at December 31, 2018, are maintained in separate composites, and are not presented in this report).

The performance of accounts with investment restrictions differs from the performance of accounts included in our principal composite for the applicable strategy because one or more securities may be omitted from the portfolio in order to comply with client restrictions and the weightings in the portfolio of other securities are correspondingly altered. The performance of non-U.S. dollar accounts differs from the performance of the principal composite for the applicable strategy because of the fluctuations in currency exchange rates between the currencies in which portfolio securities are traded and the currency in which the account is managed or U.S. dollars, respectively. Our assets under management in accounts with investment restrictions and non-U.S. dollar accounts represented approximately 2% and 9%, respectively, of our assets under management as of December 31, 2018. Results for any investment strategy described herein, and for different investment vehicles within a strategy, are affected by numerous factors, including: different material market or economic conditions; different investment management fee rates, brokerage commissions and other expenses; and the reinvestment of dividends or other earnings.

The returns for any strategy may be positive or negative, and past performance does not guarantee future results. In this report, we refer to the date on which we began tracking the performance of an investment strategy as that strategy’s “inception date”.

In this report, we present the average annual returns of our composites on a “gross” basis, which represent average annual returns before payment of fees payable to us by any portfolio in the composite and are net of commissions and transaction costs. We also present the average annual returns of certain market indices or “benchmarks” for the comparable period. The indices are unmanaged and have differing volatility, credit and other characteristics. You should not assume that there is any material overlap between the securities included in the portfolios of our investment strategies during these periods and those that comprise any of the strategy’s comparator index in this report. At times, this can cause material differences in relative performance. It is not possible to invest directly in any of the indices. The returns of these indices, as presented in this report, have not been reduced by fees and expenses associated with investing in securities, but do include the reinvestment of dividends.

The MSCI EAFE Index, the MSCI ACWI ex-US SMID Index, the MSCI ACWI Index, MSCI ACWI ex USA Small Cap Index, and the MSCI Emerging Markets Index are trademarks of MSCI Inc. MSCI Inc. is the owner of all copyrights relating to these indices and is the source of the performance statistics of these indices that are referred to in this report. MSCI makes no express or implied warranties or representations and shall have no liability whatsoever with respect to any MSCI data contained herein. The MSCI data may not be further redistributed or used to create indices or financial products. This document is not approved or produced by MSCI.

The Russell 2000^® Index, the Russell 2000^® Value Index, the Russell Midcap^® Index, the Russell Midcap^® Value Index, the Russell 1000^® Index, the Russell 1000^® Value Index, the Russell Midcap^® Growth Index, the Russell 1000^® Growth Index and the Russell 2000^® Growth Index are trademarks of Russell Investment Group. Russell Investment Group is the source and owner of the Russell Index data contained or reflected in this report and all trademarks and copyrights related thereto.

The S&P 500 Index is a product of S&P Dow Jones Indices LLC (S&P DJI) and/or its affiliates and has been licensed for use. Copyright^© 2017 S&P Dow Jones Indices LLC, a division of S&P Global, Inc. All rights reserved. Redistribution or reproduction in whole or in part are prohibited without written permission of S&P Dow Jones Indices LLC. S&P^® is a registered trademark of S&P Global and Dow Jones^® is a registered trademark of Dow Jones Trademark Holdings LLC (Dow Jones). None of S&P DJI, Dow Jones, their affiliates or third party licensors makes any representation or warranty, express or implied, as to the ability of any index to accurately represent the asset class or market sector that it purports to represent and none shall have any liability for any errors, omissions, or interruptions of any index or the data included therein.

The ICE BofAML US High Yield Master II Total Return Index is owned by ICE Data Indices, LLC, used with permission. ICE Data Indices, LLC permits use of the ICE BofAML indices and related data on an "as is" basis, makes no warranties regarding same, does not guarantee the suitability, quality, accuracy, timeliness, and/or completeness of the ICE BofAML indices or any data included in, related to, or derived therefrom, assumes no liability in connection with the use of the foregoing, and does not sponsor, endorse, or recommend Artisan Partners or any of its products or services.

In this report, we present ratings from Morningstar, Inc., for the series of Artisan Funds. The Morningstar Rating^TM for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds, and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods. The ratings which form the basis for the information reflected in this report, and the fund categories in which they are rated, relating to each Fund’s Investor Share Class are: Artisan Emerging Markets Fund—Diversified Emerging Markets; Artisan Global Equity Fund—World Stock; Artisan Global Opportunities Fund—World Stock; Artisan Global Value Fund—World Stock; Artisan High Income Fund—High Yield Bond; Artisan International Fund—Foreign Large Blend; Artisan International Small-Mid Fund—Foreign Small/Mid Growth; Artisan International Value Fund—Foreign Large Blend; Artisan Mid Cap Fund—Mid-Cap Growth; Artisan Mid Cap Value Fund—Mid-Cap Value; Artisan Small Cap Fund—Small Growth; Artisan Value Fund—Large Value. Morningstar ratings are initially given on a fund’s three year track record and change monthly.

Throughout this report, we present historical information about our assets under management, including information about changes in our assets under management due to gross client cash inflows and outflows, market appreciation and depreciation and transfers between investment vehicles (e.g., pooled investment vehicles and separate accounts). Gross client cash inflows and outflows represent client fundings, terminations and client initiated contributions and withdrawals (which could be in cash or in securities). Market appreciation (depreciation) represents realized gains and losses, the change in unrealized gains and losses, net income and certain miscellaneous items, immaterial in the aggregate, which may include payment of Artisan’s management fees or payment of custody expenses to the extent a client causes these fees to be paid from the account we manage. The effect of translating into U.S. dollars the value of portfolio securities denominated in currencies other than the U.S. dollar is included in market appreciation (depreciation). We also present information about our average assets under management for certain periods.

We use our information management systems to track our assets under management, the components of market appreciation and depreciation, and client inflows and outflows, and we believe the information set forth in this report regarding our assets under management, market appreciation and depreciation, and client inflows and outflows is accurate in all material respects. We also present information regarding the amount of our assets under management and client inflows and outflows sourced through particular investment vehicles and distribution channels. The allocation of assets under management and client flows sourced through particular distribution channels involves estimates because precise information on the sourcing of assets invested in Artisan Funds or Artisan Global Funds through intermediaries is not available on a complete or timely basis and involves the exercise of judgment because the same assets, in some cases, might fairly be said to have been sourced from more than one distribution channel. We have presented the information on our assets under management and client inflows and outflows sourced by distribution channel in the way in which we prepare and use that information in the management of our business. Data on our assets under management sourced by distribution channel and client inflows and outflows are not subject to our internal controls over financial reporting.

None of the information in this report constitutes either an offer or a solicitation to buy or sell any fund securities, nor is any such information a recommendation for any fund security or investment service.