--- schema_version: "secwatch.filing_event.v1" accession: "0001140361-26-033377" form_type: "8-K" ticker: null cik: "0000931182" company_name: "ERP OPERATING LTD PARTNERSHIP" filed_at: "2026-08-17T20:01:49+00:00" generated_at: "2026-08-17T20:03:38.653587+00:00" event_type: "m_and_a" sentiment: "neutral" materiality_score: 1.0 calibrated_materiality_score: 1.0 confidence: "high" source: SEC EDGAR --- # Equity Residential closes AvalonBay merger, renames to Vivmark Residential, ticker VMRK ## Summary - Merger closed Aug 17, 2026; AvalonBay shareholders receive 2.793 Vivmark shares per share; ~400M shares issued. - Company renamed Vivmark Residential; ticker changes to VMRK on NYSE effective Aug 18, 2026. - Board expanded to 14 trustees, 7 from each legacy board; Stephen E. Sterrett named Chairman. - Benjamin W. Schall (ex-AvalonBay CEO) becomes President & CEO; CFO Kevin P. O'Shea, COO Sean J. Breslin, CDO Matthew H. Birenbaum from AvalonBay. - AvalonBay audited and unaudited financial statements and pro forma financials included as exhibits. ## SEC filing metadata - accession: 0001140361-26-033377 - form_type: 8-K - cik: 0000931182 - company_name: ERP OPERATING LTD PARTNERSHIP - filed_at: 2026-08-17T20:01:49+00:00 - event_type: m_and_a - sentiment: neutral - materiality_score: 1.0 - calibrated_materiality_score: 1.0 - confidence: high - sec_items: 2.01, 3.03, 5.03, 5.02, 7.01, 9.01, 1.01 - EDGAR index: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - EDGAR primary document: https://www.sec.gov/Archives/edgar/data/906107/000114036126033377/ef20080318_8k.htm ## Machine-readable alternates - HTML: https://secwatch.observer/filing/0001140361-26-033377 - JSON: https://secwatch.observer/filing/0001140361-26-033377.json - Plain text: https://secwatch.observer/filing/0001140361-26-033377.txt ## Key facts - Executive change Mark J. Parrell resigned as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: resigned - Role: Trustee source text: prior to the Effective Time, each of Tahsinul Zia Huque, Mark J. Parrell and Mark S. Shapiro tendered resignations to the Board, effective as of immediately prior to the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Stephen E. Sterrett was appointed as Chairman of the Board at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Chairman of the Board source text: In addition, effective as of the Effective Time, Mr. Sterrett was appointed as Chairman of the Board. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Terry S. Brown was appointed as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Trustee source text: Each of Terry S. Brown, Conor C. Flynn, Christopher B. Howard, Charles E. Mueller, Jr., Timothy J. Naughton, Benjamin W. Schall and Susan Swanezy (collectively, the “New Trustees”) were directors of the AvalonBay board of directors prior to the Effective Time and were appointed to the Board, effective as of the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Susan Swanezy was appointed as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Trustee source text: Each of Terry S. Brown, Conor C. Flynn, Christopher B. Howard, Charles E. Mueller, Jr., Timothy J. Naughton, Benjamin W. Schall and Susan Swanezy (collectively, the “New Trustees”) were directors of the AvalonBay board of directors prior to the Effective Time and were appointed to the Board, effective as of the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Tahsinul Zia Huque resigned as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: resigned - Role: Trustee source text: prior to the Effective Time, each of Tahsinul Zia Huque, Mark J. Parrell and Mark S. Shapiro tendered resignations to the Board, effective as of immediately prior to the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Mark S. Shapiro resigned as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: resigned - Role: Trustee source text: prior to the Effective Time, each of Tahsinul Zia Huque, Mark J. Parrell and Mark S. Shapiro tendered resignations to the Board, effective as of immediately prior to the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Charles E. Mueller, Jr. was appointed as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Trustee source text: Each of Terry S. Brown, Conor C. Flynn, Christopher B. Howard, Charles E. Mueller, Jr., Timothy J. Naughton, Benjamin W. Schall and Susan Swanezy (collectively, the “New Trustees”) were directors of the AvalonBay board of directors prior to the Effective Time and were appointed to the Board, effective as of the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Christopher B. Howard was appointed as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Trustee source text: Each of Terry S. Brown, Conor C. Flynn, Christopher B. Howard, Charles E. Mueller, Jr., Timothy J. Naughton, Benjamin W. Schall and Susan Swanezy (collectively, the “New Trustees”) were directors of the AvalonBay board of directors prior to the Effective Time and were appointed to the Board, effective as of the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Conor C. Flynn was appointed as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Trustee source text: Each of Terry S. Brown, Conor C. Flynn, Christopher B. Howard, Charles E. Mueller, Jr., Timothy J. Naughton, Benjamin W. Schall and Susan Swanezy (collectively, the “New Trustees”) were directors of the AvalonBay board of directors prior to the Effective Time and were appointed to the Board, effective as of the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Benjamin W. Schall was appointed as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Trustee source text: Each of Terry S. Brown, Conor C. Flynn, Christopher B. Howard, Charles E. Mueller, Jr., Timothy J. Naughton, Benjamin W. Schall and Susan Swanezy (collectively, the “New Trustees”) were directors of the AvalonBay board of directors prior to the Effective Time and were appointed to the Board, effective as of the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm - Executive change Timothy J. Naughton was appointed as Trustee at ERP OPERATING LTD PARTNERSHIP. - Action: appointed - Role: Trustee source text: Each of Terry S. Brown, Conor C. Flynn, Christopher B. Howard, Charles E. Mueller, Jr., Timothy J. Naughton, Benjamin W. Schall and Susan Swanezy (collectively, the “New Trustees”) were directors of the AvalonBay board of directors prior to the Effective Time and were appointed to the Board, effective as of the Effective Time. evidence_url: https://www.sec.gov/Archives/edgar/data/931182/000114036126033377/0001140361-26-033377-index.htm This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.