X0609 4 2026-08-17 0000906107 VIVMARK RESIDENTIAL VMRK 0001862706 Howard Christopher B. false 4040 WILSON BLVD., SUITE 1000 ARLINGTON VA 22203 1 0 Common Shares Of Beneficial Interest 2026-08-18 4 S 0 8486 64.00 D 12730 D Restricted Units 2026-08-17 4 A 0 2710 .50 A 2036-08-17 Common Shares Of Beneficial Interest 2710 2710 D The price represents the weighted average price of the shares sold. The shares were sold within a range of $64.00 to $64.04. The reporting person will provide, upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares sold at each separate price. On August 17, 2026, the reporting person elected to receive a grant of Series 2026I restricted limited partnership interests ("RUs") in ERP Operating Limited Partnership (the "OP"), the operating partnership of Vivmark Residential (the "Company"), in connection with the Company's grant of long-term compensation for prospective service from August 17, 2026 to the 2027 Annual Meeting of Shareholders. RUs are a class of partnership interest that automatically convert into an equal number of limited partnership interests of the OP ("OP Units") when the capital account related to the RUs reaches a specified target for federal income tax purposes (provided such target is reached within ten years of issuance). Subject to the vesting requirements of the grant and certain other restrictions, OP Units are exchangeable by the holder for common shares of the Company on a one-for-one basis or the cash value of such shares, at the Company's option. The RUs reflected in this report also include any OP Units into which such RUs automatically convert. The RUs are scheduled to vest on August 17, 2027. In addition, the RUs (including any OP Units into which they may automatically convert) are subject to a holding restriction until August 17, 2028. /s/ Samantha Thompson, Attorney-in-fact 2026-08-19