Company: MGRE
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042543
Chunk: 3

Company: AFFILIATED MANAGERS GROUP, INC.
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 3
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 add, update, or change the information contained or incorporated by reference in this prospectus and also will describe the specific manner in which we will offer these securities.

The applicable prospectus supplement may also contain important information about United States federal income tax consequences and, in
certain circumstances, consequences under other countries’ tax laws to which you may become subject if you acquire the securities being offered by that prospectus supplement. You should read carefully both this prospectus and any prospectus
supplement together with the additional information described under the heading “Where You Can Find More Information.”

We are
responsible for the information contained or incorporated by reference in this prospectus and the applicable prospectus supplement. We have not authorized any other person to provide you with different information, and we take no responsibility for
any other information that others may give you. We are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus or incorporated by
reference herein is accurate only as of the date on the front of this prospectus or the respective dates of filing of the incorporated documents. Our business, financial condition, results of operations, and prospects may have changed since that
date.

Unless otherwise indicated or unless the context requires otherwise, all references in this prospectus to “AMG,”
“we,” “us,” the “Company,” and “our” refer to Affiliated Managers Group, Inc. and not our Affiliates (as defined later in this prospectus) or other subsidiaries.

1

RISK FACTORS

Before you invest in any of our securities, in addition to the other information in this prospectus and any applicable prospectus supplement
or free writing prospectus, you should carefully read and consider the risk factors under the heading “Risk Factors” contained in Part I, Item 1A in our most recent Annual Report on Form 10-K, which
is incorporated by reference into this prospectus, as well as any risk factors contained in our subsequent Quarterly Reports on Form 10-Q and any applicable prospectus supplement, as the same may be updated
from time to time by our future filings under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Each of the risks described in these documents could materially and adversely affect our business, financial condition,
liquidity, results of operations, and prospects, and could result in a partial or complete loss of your investment.

2

FORWARD-LOOKING STATEMENTS