Sean Thomas Willson - 17 Aug 2026 Form 4 Insider Report for AVALONBAY COMMUNITIES INC (AVB)

Footnote F1

Represents the deemed acquisition of common stock, par value $0.01 per share ("AVB Common Stock"), of AvalonBay Communities, Inc., a Maryland corporation ("AVB"), pursuant to restricted stock units that were subject to performance-based vesting conditions (each, a "PSU"), which were previously granted to the Reporting Person. The number of PSUs reflects deemed achievement at the greater of actual performance and the target level for each respective award, as determined by the Compensation Committee of AVB effective as of the Effective Time (as defined below), and the PSUs converted into the right to receive restricted shares of Equity Residential, a Maryland real estate investment trust ("EQR") or limited partnership interests in ERP Operating Limited Partnership, an Illinois limited partnership ("ERP OP"), the operating partnership of EQR, in each case, subject to the same time-based vesting conditions that were previously applicable to the PSUs.

Footnote F2

Pursuant to the Agreement and Plan of Merger, dated as of May 20, 2026 (the "Merger Agreement"), by and among AVB, EQR, ERP OP, 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.

Footnote F3

At the effective time of the Merger (the "Effective Time"), each issued and outstanding share of AVB Common Stock 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 ("EQR Common Shares"), of EQR, plus 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.

Footnote F4

This total includes shares of AVB Common Stock, restricted shares, PSUs deemed to have been earned as of the Effective Time and shares acquired through AVB's Employee Stock Purchase Plan.