MUELLER CHARLES E JR

SEC source: 0000906107-26-000059 · form4.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,084

F1 · price: The price represents the weighted average price of the shares sold. The shares were sold within a range of $63.85 to $63.97. 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.

SEC source: 0001193125-26-354185 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · kind: Pursuant to the Agreement and Plan of Merger, dated as of May 20, 2026 (the "Merger Agreement"), by and among AvalonBay Communities, Inc., a Maryland corporation ("AVB"), Equity Residential, a Maryland real estate investment trust ("EQR"), ERP Operating Limited Partnership, an Illinois limited partnership, and Canopy Merger Sub LLC, a Maryland limited liability company ("Merger Sub"), AVB and EQR combined in a merger of equals on August 17, 2026, with AVB merging with and into Merger Sub, with Merger Sub surviving as a wholly owned subsidiary of EQR (the "Merger"). In connection with the Merger, EQR changed its name to Vivmark Residential.

F2 · kind: At the effective time of the Merger (the "Effective Time"), each issued and outstanding share of common stock, par value $0.01 per share ("AVB Common Stock"), of AVB and deferred stock unit held by the Reporting Person, respectively, was automatically converted into the right to receive 2.793 (the "Exchange Ratio") common shares of beneficial interest, $0.01 par value per share ("EQR Common Shares"), of EQR, plus, in the case of AVB Common Stock, the right to receive cash in lieu of fractional EQR Common Shares, if any, into which such AVB Common Stock would have been converted. On August 14, 2026, the closing price of AVB Common Stock was $184.06 per share and the closing price of EQR Common Shares was $65.97 per share.

F3 · shares: This total includes shares of AVB Common Stock and deferred stock units.

F1 · price: Pursuant to the Agreement and Plan of Merger, dated as of May 20, 2026 (the "Merger Agreement"), by and among AvalonBay Communities, Inc., a Maryland corporation ("AVB"), Equity Residential, a Maryland real estate investment trust ("EQR"), ERP Operating Limited Partnership, an Illinois limited partnership, and Canopy Merger Sub LLC, a Maryland limited liability company ("Merger Sub"), AVB and EQR combined in a merger of equals on August 17, 2026, with AVB merging with and into Merger Sub, with Merger Sub surviving as a wholly owned subsidiary of EQR (the "Merger"). In connection with the Merger, EQR changed its name to Vivmark Residential.

F2 · price: At the effective time of the Merger (the "Effective Time"), each issued and outstanding share of common stock, par value $0.01 per share ("AVB Common Stock"), of AVB and deferred stock unit held by the Reporting Person, respectively, was automatically converted into the right to receive 2.793 (the "Exchange Ratio") common shares of beneficial interest, $0.01 par value per share ("EQR Common Shares"), of EQR, plus, in the case of AVB Common Stock, the right to receive cash in lieu of fractional EQR Common Shares, if any, into which such AVB Common Stock would have been converted. On August 14, 2026, the closing price of AVB Common Stock was $184.06 per share and the closing price of EQR Common Shares was $65.97 per share.

SEC source: 0000906107-26-000059 · form4.xml · derivative · entry 2

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,710

Underlying: Common Shares Of Beneficial Interest · 2,710 shares

Expires 2036-08-17

F2 · security: 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.

F3 · derivative.exercise_price: 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.

F4 · derivative.exercise_date: 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.

SEC source: 0001193125-26-252144 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,556.4718

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's 2026 Equity Incentive Plan, which Units are subject to vesting requirements. The Units will convert into common stock on a one to one basis after the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0001193125-26-234644 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,474.4718

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis after the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0001193125-26-092198 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,237.6834

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis after the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0001193125-25-306698 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,001.3506

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis after the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-25-113075 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,769.171

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-25-080479 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,551.8693

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan, which Units are subject to vesting requirements. The Units will convert into common stock on a one to one basis after the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-25-076395 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,580.8693

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-25-033738 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,389.9397

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-24-133247 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,215.9662

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-24-103994 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,050.1284

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-24-065405 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,876.941

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan, which Units are subject to vesting requirements. The Units will convert into common stock on a one to one basis after the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-24-061781 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,896.941

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-24-026099 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,748.734

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0000950170-23-068382 · ownership.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,588.5789

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one basis when the reporting person ceases to be a director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, which may be subject to vesting requirements.

SEC source: 0001209191-23-048324 · doc4.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,429.6829

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one bases when the reporting person ceases to be an employee or director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, some of which may be subject to vesting requirements.

SEC source: 0001209191-23-034512 · doc4.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,275.634

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan, which Units are subject to vesting requirements. The Units will convert into common stock on a one to one basis when the reporting person ceases to be an employee or director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, including Units, some of which may be subject to vesting requirements.

SEC source: 0001209191-23-032186 · doc4.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,285.634

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one bases when the reporting person ceases to be an employee or director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, some of which may be subject to vesting requirements.

SEC source: 0001209191-23-015356 · doc4.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,135.546

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one bases when the reporting person ceases to be an employee or director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, some of which may be subject to vesting requirements.

SEC source: 0001209191-22-059307 · doc4.xml · nonDerivative · entry 2

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,981

F3 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan pursuant to an election previously made by the reporting person to receive Units in lieu of the quarterly cash director's fee otherwise due. The Units will convert into common stock on a one for one bases when the reporting person ceases to be an employee or director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, some of which may be subject to vesting requirements.

SEC source: 0001209191-22-059307 · doc4.xml · nonDerivative · entry 1

MUELLER CHARLES E JR · CIK 0001195976 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,934

F1 · shares: Reflects grant of Deferred Stock Units ("Units") under the issuer's Second Amended and Restated 2009 Equity Incentive Plan, which Units are subject to vesting requirements. The Units will convert into common stock on a one to one basis when the reporting person ceases to be an employee or director of the issuer.

F2 · balance_after: The amount of securities owned following the reported transaction reflects direct ownership of all shares of common stock, some of which may be subject to vesting requirements.