SEC FORM 3

SEC FORM 3SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Birenbaum Matthew H.

(Last)

(First)

(Middle)

4040 WILSON BLVD., SUITE 1000

(Street)

ARLINGTON

VIRGINIA

22203

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
08/17/2026

3. Issuer Name and Ticker or Trading Symbol
VIVMARK RESIDENTIAL [ VMRK ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Executive Vice President & CDO

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Shares Of Beneficial Interest	238,203⁽¹⁾⁽²⁾⁽³⁾	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Non-qualified Stock Option (Right to Buy)	03/01/2023	02/25/2031	Common Shares Of Beneficial Interest	48,760⁽⁴⁾	$64.57⁽⁴⁾	D

Explanation of Responses:

1. 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"), Vivmark Residential (f/k/a Equity Residential), a Maryland real estate investment trust ("VMRK"), ERP Operating Limited Partnership, an Illinois limited partnership (the "Operating Partnership"), and Canopy Merger Sub LLC, a Maryland limited liability company ("Merger Sub"), AVB and VMRK 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 VMRK (the "Merger"). Merger Sub subsequently merged with and into the Operating Partnership, with the Operating Partnership continuing as the surviving entity.

2. At the effective time of the Merger (the "Effective Time"), each issued and outstanding share of common stock, par value $0.01 per share (the "AVB Common Stock"), of AVB held by the Reporting Person was automatically converted into the right to receive 2.793 (the "Exchange Ratio") common shares of beneficial interest, $0.01 par value per share ("VMRK Common Shares"), of VMRK, plus the right to receive cash in lieu of fractional VMRK Common Shares, if any, into which such AVB Common Stock would have been converted.

3. Total reflects the Reporting Person's shares of AVB Common Stock that were converted into VMRK Common Shares pursuant to the Merger and includes restricted shares of VMRK scheduled to vest in the future.

4. Pursuant to the Merger Agreement, effective as of the Effective Time, the Reporting Person's options to acquire AVB Common Stock that were outstanding at the Effective Time were converted into the right to receive options to acquire VMRK Common Shares, where the number of VMRK Common Shares subject to such converted option is equal to (i) the number of shares of AVB Common Stock subject to the corresponding AVB option award immediately prior to the Effective Time multiplied by (ii) the Exchange Ratio (rounded down to the nearest whole number of shares), and the exercise price of each converted option award is equal to (A) the exercise price of the corresponding AVB option award immediately prior to the Effective Time divided by (B) the Exchange Ratio (rounded up to the nearest whole cent).

	/s/ Samantha Thompson, Attorney-in-fact	08/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)