Company: FRT-PC
Filing Date: 2025-03-28
Form Type: DEFA14A
Source: 0001193125-25-066332
Chunk: 0

Company: FEDERAL REALTY INVESTMENT TRUST
Filing Date: 2025-03-28
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒Filed by a party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 
 14a-6(e)(2))                                                       |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material Pursuant to §240.14a-12 |

FEDERAL REALTY INVESTMENT TRUST (Name of Registrant as Specified in its Charter) Not applicable. (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ |     | No fee required.                                                                                     |
| ☐ |     | Fee paid previously with preliminary materials.                                                      |
| ☐ |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |

Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting of FEDERAL REALTY INVESTMENT TRUST To Be Held On: May 7, 2025 at 9:00 a.m. https://web.lumiconnect.com/202329683 (password: federal2025)

| COMPANY NUMBER |
| ACCOUNT NUMBER |
| CONTROL NUMBER |

This communication presents only an overview of the more completed proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. If you want to receive a paper or e-mailcopy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before 04/28/25. Please visit http://www.federalrealty.com/shareholder-meeting, where the following is available for view:

|                      |     |                                                                                                              |     | • Annual Report/Form 10-K/Notice & Proxy Statement                                                                                                                          |
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