AVALONBAY COMMUNITIES INC

As announced by the Company on February 13, 2024, W. Edward Walter, a director on the Company’s Board of Directors (the “Board”), has decided to retire from the Board at the time of our 2024 Annual Meeting of Stockholders. Promptly following his departure, Mr. Walter will receive shares of common stock of the Company in respect of all of his vested deferred stock units received pursuant to our Directors’ Deferred Compensation Program. On February 28, 2024, Mr. Walter adopted a Rule 10b5-1 trading arrangement (the “10b5-1 Plan”) intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). The 10b5-1 Plan is effective from May 29, 2024 until December 31, 2024 and covers the sale of up to 12,177 shares of common stock to be received by Mr. Walter in respect of his deferred stock units (plus any shares of common stock received from dividend equivalents on such units). None of the Company’s other directors or officers (as defined in Rule 16a-1(f) of the Exchange Act)adopted, terminated or modified a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K) during the three months ended March 31, 2024.