Company: MGRE
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042543
Chunk: 11

Company: AFFILIATED MANAGERS GROUP, INC.
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 11
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 the number of 
 warrants issued with each security;                                                                        |

| • |     | the date, if any, on and after which, if the warrants are issued as a unit with another security, the warrants 
 and the related security will be separately transferable;                                                      |

| • |     | the minimum or maximum number of warrants that may be exercised at any one time; |

| • |     | the date on which the right to exercise warrants will commence and the date on which the right will expire; |

| • |     | a discussion of United States federal income tax or other considerations applicable to the warrants; |

| • |     | anti-dilution provisions of the warrants, if any; |

| • |     | redemption or call provisions, if any, applicable to the warrants; and |

| • |     | any additional terms of the warrants, including terms, procedures, and limitations relating to the exchange and 
 exercise of the warrants.                                                                                       |

12

DESCRIPTION OF SUBSCRIPTION RIGHTS We may issue subscription rights to purchase debt securities, preferred stock, common stock, or other securities. These subscription rights may be issued independently or together with any other security offered hereby and may or may not be transferable by the stockholder receiving the subscription rights in such offering. In connection with any offering of subscription rights, we may enter into a standby arrangement with one or more underwriters or other purchasers pursuant to which the underwriters or other purchasers may be required to purchase any securities remaining unsubscribed for after such offering. The applicable prospectus supplement will describe the specific terms of any offering of subscription rights for which this prospectus is being delivered, including the following:

| • |     | the price, if any, for the subscription rights; |

| • |     | the exercise price payable for each share of debt securities, preferred stock, common stock, or other securities 
 upon the exercise of the subscription rights;                                                                    |

| • |     | the number of subscription rights issued to each stockholder; |

| • |     | the number and terms of the shares of debt securities, preferred stock, common stock, or other securities which 
 may be purchased per each subscription right;                                                                   |

| • |     | the extent to which the subscription rights are transferable; |

| • |     | any additional terms of the subscription rights, including terms, procedures, and limitations relating to the 
 exchange and exercise of the subscription rights;                                                             |

| • |     | the date on which the right to exercise the subscription rights will