---
schema_version: "secwatch.filing_event.v1"
accession: "0001057352-26-000008"
form_type: "8-K"
ticker: "CSGP"
cik: "0001057352"
company_name: "COSTAR GROUP, INC."
filed_at: "2026-02-13T23:59:59+00:00"
generated_at: "2026-05-16T02:42:24.271874+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# CoStar amends severance plan, removes director-change clause to avoid activist litigation

## Summary
- Removed the 'director clause' from Change in Control definition in Executive Severance Plan.
- Clause was meant to protect management continuity; removed due to threatened proxy contests by Third Point and D.E. Shaw.
- Board and Compensation Committee unanimously approved original clause but agreed to removal at management's request.
- All other terms of the Amended Severance Plan remain unchanged and in effect.
- Company sought to avoid cost and distraction of an opportunistic Delaware lawsuit.

## SEC filing metadata
- accession: 0001057352-26-000008
- form_type: 8-K
- ticker: CSGP
- cik: 0001057352
- company_name: COSTAR GROUP, INC.
- filed_at: 2026-02-13T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1057352/000105735226000008/0001057352-26-000008-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1057352/000105735226000008/csgp-20260213.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001057352-26-000008
- JSON: https://secwatch.observer/filing/0001057352-26-000008.json
- Plain text: https://secwatch.observer/filing/0001057352-26-000008.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.