Exhibit 99.1

AMG Reports Financial and Operating Results

for the Fourth Quarter and Full Year 2016

Company Reports EPS of $2.67; Economic EPS of $3.80 for Fourth Quarter,

EPS of $8.57; Economic EPS of $12.84 for Full Year 2016;

Company Initiates Quarterly Cash Dividend

WEST PALM BEACH, FL, January 30, 2017 — Affiliated Managers Group, Inc. (NYSE: AMG) today reported its financial and operating results for the fourth quarter and full year 2016.

For the fourth quarter of 2016, diluted earnings per share were $2.67, compared to $2.67 for the same period of 2015, and Economic earnings per share (“Economic EPS”) were $3.80, compared to $3.59 for the same period of 2015. For the fourth quarter of 2016, Net income was $150.2 million, compared to $147.5 million for the same period of 2015. For the fourth quarter of 2016, Economic net income was $211.2 million, compared to $195.8 million for the same period of 2015. For the fourth quarter of 2016, Adjusted EBITDA was $289.7 million, compared to $263.1 million for the same period of 2015. For the fourth quarter of 2016, Revenue was $550.3 million, compared to $589.8 million for the same period of 2015. For the fourth quarter of 2016, Aggregate revenue, which includes revenue from consolidated Affiliates as well as Equity method revenue (which represents asset-based fees and performance fees earned by Affiliates accounted for under the equity method), was $1.3 billion, compared to $1.2 billion for the same period of 2015. (Economic EPS, Economic net income, and Adjusted EBITDA are defined in the attached tables, along with reconciliations to the most directly comparable GAAP measure.)

For the year ended December 31, 2016, diluted earnings per share were $8.57, compared to $9.17 for 2015, and Economic earnings per share were $12.84, compared to $12.47 for 2015. For the year ended December 31, 2016, Net income was $472.8 million, compared to $509.5 million for 2015. For the year ended December 31, 2016, Economic net income was $703.6 million, compared to $687.2 million for 2015. For the year ended December 31, 2016, Adjusted EBITDA was $945.5 million, compared to $942.2 million for 2015. For the year ended December 31, 2016, Revenue was $2.2 billion, compared to $2.5 billion for 2015, and Aggregate revenue was $4.3 billion, compared to $4.1 billion for 2015.

Net client cash flows for the fourth quarter of 2016 were $(4.1) billion, and for the full year were $7.4 billion. AMG’s aggregate assets under management were approximately $727 billion at December 31, 2016, pro forma for investments which have since closed.

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“AMG generated strong results for the fourth quarter and the full year 2016, including Economic earnings per share of $3.80 for the fourth quarter and $12.84 for the full year, both at record levels and representing earnings growth of 6% and 3% for each period, respectively,” stated Sean M. Healey, Chairman and Chief Executive Officer of AMG. “Against the backdrop of earnings declines across the asset management industry broadly, we continued to produce growth in our earnings, even with only a partial impact from investments closed during the second half of the year. With assets under management increasing 16% year-over-year to $727 billion, we enhanced the earnings power of our business through successful execution across all aspects of our growth strategy – including positive organic growth from net client cash flows in 2016, the long-term investment outperformance of our Affiliates, and the addition of outstanding new Affiliates during the year.”

“While we saw modest outflows in the fourth quarter, driven in large part by anticipated seasonal client redemptions and realization activity in private equity and similar strategies, our Affiliates generated positive net client cash flows of $7.4 billion for the full year across our diverse active equity and alternative product set, notwithstanding industry-wide net outflows in alpha-oriented product areas,” Mr. Healey continued. “Given increased dispersion of asset returns and post-election expectations for regulatory reform and economic growth, high-conviction active managers are positioned to outperform passive products. The best managers will distinguish themselves in this environment, which will benefit AMG across our broad array of industry-leading active equity and alternative strategies, given our Affiliates’ outstanding track records of investment outperformance.”

“We were pleased to add a number of excellent new Affiliates in 2016 through the continued successful execution of our new investments strategy, and the quality of these firms, including Winton, Capula, and Baring Asia, reflects AMG’s competitive position as the partner of choice for leading independent firms around the world,” Mr. Healey concluded. “Looking ahead, given the significant and growing scale of our business, we are confident in our ability to continue to generate meaningful earnings growth through accretive investments in outstanding new Affiliates, while also consistently returning capital to shareholders through share repurchases, and now a dividend. With this disciplined commitment to capital allocation, along with the organic growth of existing Affiliates, we are uniquely positioned to generate long-term shareholder value.”

About AMG

AMG is a global asset management company with equity investments in leading boutique investment management firms. AMG’s innovative partnership approach allows each Affiliate’s management team to own significant equity in their firm while maintaining operational autonomy. AMG’s strategy is to generate growth through the internal growth of existing Affiliates, as well as through investments in new Affiliates, and additional investments in existing Affiliates. In addition, AMG provides centralized assistance to its Affiliates in strategic matters, marketing, distribution, product development, and operations. As of December 31, 2016, AMG’s aggregate assets under management were approximately $727 billion, pro forma for investments which have since closed, in more than 500 investment products across a broad range of active, return-oriented strategies. For more information, please visit the Company’s website at www.amg.com.

Certain matters discussed in this press release may constitute forward-looking statements within the meaning of the federal securities laws. These statements include, but are not limited to, statements related to our expectations regarding the performance of our business, our financial results, our liquidity and capital resources and other non-historical statements. You can identify these forward-looking statements by the use of words such as “outlook,” “guidance,” “believes,” “expects,” “potential,” “continues,” “may,” “will,” “should,” “seeks,” “approximately,” “predicts,” “projects,” “intends,” “plans,” “estimates,” “pending investments,” “anticipates” or the negative version of these words or other comparable words. Actual results and the timing of certain events could differ materially

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from those projected in or contemplated by the forward-looking statements due to a number of factors, including changes in the securities or financial markets or in general economic conditions, the availability of equity and debt financing, competition for acquisitions of interests in investment management firms, the ability to close pending investments, the investment performance and growth rates of our Affiliates and their ability to effectively market their investment strategies, the mix of Affiliate contributions to our earnings and other risks, uncertainties and assumptions, including those described under the section entitled “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2015, as such factors may be updated from time to time in our periodic filings with the SEC, which are accessible on the SEC’s website at www.sec.gov. These factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in this release and in our filings with the SEC. We undertake no obligation to publicly update or review any forward-looking statements, whether as a result of new information, future developments or otherwise, except as required by applicable law. We have presented certain non-GAAP and operating performance measures in this press release, which are provided in addition to, but not as a substitute for, GAAP measures of performance. These operating measures include Aggregate revenue, which includes the revenue from consolidated Affiliates as well as Equity method revenue, and is used by management to evaluate operational trends across all Affiliates, regardless of accounting treatment. Additional information is provided in the attached tables.

From time to time, AMG may use its website as a distribution channel of material Company information. AMG routinely posts financial and other important information regarding the Company in the Investor Relations section of its website at www.amg.com and encourages investors to consult that section regularly.

Financial Tables Follow

A teleconference will be held with AMG’s management at 8:30 a.m. Eastern time today. Parties interested in listening to the teleconference should dial 1-877-407-8291 (U.S. calls) or 1-201-689-8345 (non-U.S. calls) starting at 8:15 a.m. Eastern time. Those wishing to listen to the teleconference should dial the appropriate number at least ten minutes before the call begins.

The teleconference will also be available for replay beginning approximately one hour after the conclusion of the call. To hear a replay of the call, please dial 1-877-660-6853 (U.S. calls) or 1-201-612-7415 (non-U.S. calls) and provide conference ID 13653857. The live call and replay of the session, and additional financial information referenced during the teleconference, can also be accessed via AMG’s website at http://www.amg.com/InvestorRelations/.

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AMG

Financial and Operating Highlights

(in millions, except as noted and per share data)

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AMG

Financial and Operating Highlights

(in millions, except as noted and per share data)

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AMG

Reconciliations of Earnings Per Share Calculation

(in millions, except per share data)

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AMG

Reconciliations of Average Shares Outstanding

(in millions)

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AMG

Operating Results

Assets under Management

(in billions)

Statement of Changes – Quarter to Date

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AMG

Reconciliations of Performance Measures

(in millions, except per share data)

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AMG

Consolidated Statements of Income

(in millions, except per share data)

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AMG

Consolidated Balance Sheets

(in millions)

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AMG

Notes

(in millions, except per share data)

The tables below show the effect of correcting the misstatement on our Consolidated Statements of Income, Performance Measures and Consolidated Balance Sheet. The revision had no impact on Income before income taxes or Total stockholders’ equity.

We add back intangible amortization and impairments attributable to acquired client relationships because these expenses do not correspond to the changes in the value of these assets, which do not diminish predictably over time. The portion of deferred taxes generally attributable to intangible assets (including goodwill) is added back because we believe it is unlikely these accruals will be used to settle material tax obligations. We add back non-cash imputed

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AMG

Notes (continued)

(in millions, except per share data)

interest and reductions or increases in contingent payment arrangements because it better reflects our contractual interest obligations. We add back non-cash expenses relating to certain transfers of equity between Affiliate partners when these transfers have no dilutive effect to shareholders.

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AMG

Notes (continued)

(in millions, except per share data)

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