{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-074119","form_type":"8-K","ticker":"CSGP","cik":"0001057352","company_name":"COSTAR GROUP, INC.","filed_at":"2025-04-07T23:59:59+00:00","discovered_at":"2026-05-14T18:02:47.350453+00:00","generated_at":"2026-05-23T19:23:37.413439+00:00","sec_items":["1.01","5.02","7.01","9.01"],"event_type":"leadership","sentiment":"positive","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"CoStar appoints Berisford, Glaser, McCarthy to board; Klein, Nassetta, Kaplan retire","bullets":["Board expands to eight directors, seven independent; Louise Sams named Chair.","Capital Allocation Committee formed, includes Florance (chair), Berisford, McCarthy, Musslewhite.","Support agreements with D.E. Shaw group and Third Point; standstill, voting, non-disparagement.","Company to review executive compensation programs to align with stockholder value.","Michael Klein, Christopher Nassetta, Laura Kaplan resign; no disagreement with company."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-074119","json":"https://secwatch.observer/filing/0001193125-25-074119.json","markdown":"https://secwatch.observer/filing/0001193125-25-074119.md","text":"https://secwatch.observer/filing/0001193125-25-074119.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/0001193125-25-074119-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/d937923d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-23T19:23:37.413439+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":"165ab54120","claim":"John Berisford was elected as Director at COSTAR GROUP, INC..","evidence_excerpt":"Effective as of April 6, 2025, the Board elected each of Christine M. McCarthy, John Berisford and Rachel C. Glaser to serve on the Board.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/0001193125-25-074119-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"elected"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"192781adf9","claim":"Rachel C. Glaser was elected as Director at COSTAR GROUP, INC..","evidence_excerpt":"Effective as of April 6, 2025, the Board elected each of Christine M. McCarthy, John Berisford and Rachel C. Glaser to serve on the Board.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/0001193125-25-074119-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"elected"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"32abd6fbe3","claim":"Christine M. McCarthy was elected as Director at COSTAR GROUP, INC..","evidence_excerpt":"Effective as of April 6, 2025, the Board elected each of Christine M. McCarthy, John Berisford and Rachel C. Glaser to serve on the Board.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/0001193125-25-074119-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"elected"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"5de724264d","claim":"Michael R. Klein resigned as Director at COSTAR GROUP, INC..","evidence_excerpt":"Effective as of April 6, 2025, each of Michael R. Klein, Christopher J. Nassetta and Laura C. Kaplan tendered their resignations from the Board, all applicable Board committees and, for Mr. Klein, from his role as Chairman of the Board, effective as of the election of the New Independent Appointees.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/0001193125-25-074119-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"9449d6080c","claim":"Laura C. Kaplan resigned as Director at COSTAR GROUP, INC..","evidence_excerpt":"Effective as of April 6, 2025, each of Michael R. Klein, Christopher J. Nassetta and Laura C. Kaplan tendered their resignations from the Board, all applicable Board committees and, for Mr. Klein, from his role as Chairman of the Board, effective as of the election of the New Independent Appointees.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/0001193125-25-074119-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"9861585015","claim":"Christopher J. Nassetta resigned as Director at COSTAR GROUP, INC..","evidence_excerpt":"Effective as of April 6, 2025, each of Michael R. Klein, Christopher J. Nassetta and Laura C. Kaplan tendered their resignations from the Board, all applicable Board committees and, for Mr. Klein, from his role as Chairman of the Board, effective as of the election of the New Independent Appointees.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1057352/000119312525074119/0001193125-25-074119-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}