{"schema_version":"secwatch.filing_event.v1","accession":"0001680247-26-000091","form_type":"8-K","ticker":"PUMP","cik":"0001680247","company_name":"ProPetro Holding Corp.","filed_at":"2026-06-01T20:16:36+00:00","discovered_at":"2026-06-01T20:18:00.558374+00:00","generated_at":"2026-06-01T20:33:05.640104+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.3,"calibrated_materiality_score":0.3,"confidence":"high","headline":"Director Alex Volkov resigns from ProPetro board after Pioneer (Exxon) sells all shares","bullets":["Alex V. Volkov resigned from the Board on May 28, 2026; Board reduced from 8 to 7 directors.","Volkov was designated by Pioneer (Exxon subsidiary) under an Investor Rights Agreement.","Pioneer sold all its remaining ProPetro shares on May 20, 2026, ending its designation rights.","Resignation was not due to any disagreement with management or Board."],"urls":{"canonical":"https://secwatch.observer/filing/0001680247-26-000091","json":"https://secwatch.observer/filing/0001680247-26-000091.json","markdown":"https://secwatch.observer/filing/0001680247-26-000091.md","text":"https://secwatch.observer/filing/0001680247-26-000091.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1680247/000168024726000091/0001680247-26-000091-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1680247/000168024726000091/pump-20260528.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-01T20:33:05.640104+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"e25b0ae315","claim":"Alex V. Volkov resigned as Director at ProPetro Holding Corp..","evidence_excerpt":"On May 28, 2026, ProPetro Holding Corp. (the “Company”) announced the resignation of Alex V. 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(the “Company”) and a member of the Nominating and Corporate Governance Committee, notified the Company of her intention not to stand for re-election to the Board at the Company’s 2026 Annual Meeting of Stockholders (the “Meeting”) and to retire from the Board and all committees thereof, effective upon the date of the Meeting.","comparable_evidence_url":"https://www.sec.gov/Archives/edgar/data/1850902/000185090226000011/0001850902-26-000011-index.htm"}},{"accession":"0001213900-26-063573","ticker":"MZYX","company_name":"MOZAYYX Acquisition Corp.","filed_at":"2026-06-01T21:00:14+00:00","headline":"MOZAYYX Acquisition appoints Emma Rose Bienvenu as independent director","event_type":"leadership","sec_items":["5.02"],"materiality_score":0.3,"calibrated_materiality_score":0.3,"match_reasons":["same fact type: executive_change","same SEC item: 5.02","same event type: leadership","similar materiality"],"urls":{"canonical":"https://secwatch.observer/filing/0001213900-26-063573","json":"https://secwatch.observer/filing/0001213900-26-063573.json","markdown":"https://secwatch.observer/filing/0001213900-26-063573.md","edgar_index":"https://www.sec.gov/Archives/edgar/data/2097376/000121390026063573/0001213900-26-063573-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/2097376/000121390026063573/ea0292919-8k_moxayyx.htm"},"side_by_side_evidence":{"fact_type":"executive_change","source_excerpt":"On May 28, 2026, ProPetro Holding Corp. 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(the “Company”) (NYSE American: JOB) issued a press release announcing that Ms. Darla Moore, has resigned as a member of the Board of Directors (the “Board”) and from all committees of the Company’s Board effective June 1, 2026, due to the time requirements necessary for her existing and new business commitments.","comparable_evidence_url":"https://www.sec.gov/Archives/edgar/data/40570/000147793226003559/0001477932-26-003559-index.htm"}},{"accession":"0001534969-26-000028","ticker":"SERA","company_name":"SERA PROGNOSTICS, INC.","filed_at":"2026-06-01T20:44:21+00:00","headline":"Sera Prognostics director Jeff Elliott resigns ahead of annual meeting","event_type":"leadership","sec_items":["5.02","9.01"],"materiality_score":0.3,"calibrated_materiality_score":0.3,"match_reasons":["same fact type: executive_change","same SEC item: 5.02","same event type: leadership","similar materiality"],"urls":{"canonical":"https://secwatch.observer/filing/0001534969-26-000028","json":"https://secwatch.observer/filing/0001534969-26-000028.json","markdown":"https://secwatch.observer/filing/0001534969-26-000028.md","edgar_index":"https://www.sec.gov/Archives/edgar/data/1534969/000153496926000028/0001534969-26-000028-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1534969/000153496926000028/sera-20260526.htm"},"side_by_side_evidence":{"fact_type":"executive_change","source_excerpt":"On May 28, 2026, ProPetro Holding Corp. 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Mullins to Board of Directors effective June 1, 2026","event_type":"leadership","sec_items":["5.02","7.01","9.01"],"materiality_score":0.25,"calibrated_materiality_score":0.25,"match_reasons":["same fact type: executive_change","same SEC item: 5.02","same event type: leadership","similar materiality"],"urls":{"canonical":"https://secwatch.observer/filing/0001681459-26-000035","json":"https://secwatch.observer/filing/0001681459-26-000035.json","markdown":"https://secwatch.observer/filing/0001681459-26-000035.md","edgar_index":"https://www.sec.gov/Archives/edgar/data/1681459/000168145926000035/0001681459-26-000035-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1681459/000168145926000035/fti-20260529.htm"},"side_by_side_evidence":{"fact_type":"executive_change","source_excerpt":"On May 28, 2026, ProPetro Holding Corp. (the “Company”) announced the resignation of Alex V. Volkov from the Company’s Board of Directors (the “Board”).","source_evidence_url":"https://www.sec.gov/Archives/edgar/data/1680247/000168024726000091/0001680247-26-000091-index.htm","comparable_excerpt":"the Board elected Eric Mullins to the Board and appointed Mr. Mullins to the Audit Committee of the Board, effective June 1, 2026.","comparable_evidence_url":"https://www.sec.gov/Archives/edgar/data/1681459/000168145926000035/0001681459-26-000035-index.htm"}},{"accession":"0001193125-26-251548","ticker":"MCRB","company_name":"Seres Therapeutics, Inc.","filed_at":"2026-06-01T20:30:55+00:00","headline":"Seres Therapeutics board member Hans-Juergen Woerle resigns, effective May 31, 2026","event_type":"leadership","sec_items":["5.02"],"materiality_score":0.25,"calibrated_materiality_score":0.25,"match_reasons":["same fact type: executive_change","same SEC item: 5.02","same event type: leadership","similar materiality"],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-251548","json":"https://secwatch.observer/filing/0001193125-26-251548.json","markdown":"https://secwatch.observer/filing/0001193125-26-251548.md","edgar_index":"https://www.sec.gov/Archives/edgar/data/1609809/000119312526251548/0001193125-26-251548-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1609809/000119312526251548/d100982d8k.htm"},"side_by_side_evidence":{"fact_type":"executive_change","source_excerpt":"On May 28, 2026, ProPetro Holding Corp. (the “Company”) announced the resignation of Alex V. Volkov from the Company’s Board of Directors (the “Board”).","source_evidence_url":"https://www.sec.gov/Archives/edgar/data/1680247/000168024726000091/0001680247-26-000091-index.htm","comparable_excerpt":"On May 30, 2026, Hans-Juergen Woerle, M.D., Ph.D. resigned from his position as a member of the board of directors of Seres Therapeutics, Inc. 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(the “Company”) announced the resignation of Alex V. Volkov from the Company’s Board of Directors (the “Board”).","source_evidence_url":"https://www.sec.gov/Archives/edgar/data/1680247/000168024726000091/0001680247-26-000091-index.htm","comparable_excerpt":"On May 26, 2026, Dmitri Stockton notified the Board of Directors (the “Board”) of Deere & Company (the “Company”) that he would not stand for re-election as a director at the 2027 annual meeting of stockholders.","comparable_evidence_url":"https://www.sec.gov/Archives/edgar/data/315189/000110465926068930/0001104659-26-068930-index.htm"}}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}