---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-246361"
form_type: "8-K"
ticker: "CSGP"
cik: "0001057352"
company_name: "COSTAR GROUP, INC."
filed_at: "2026-05-29T12:05:09+00:00"
generated_at: "2026-05-29T12:09:40.957681+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# CoStar Group acquires Zonda for $800M cash; expands into new home construction data and marketplaces

## Summary
- Acquisition of Zonda, a new home data and software provider, for $800M in cash; not subject to financing condition.
- Zonda serves over 3,000 customers; 104% net customer retention on subscription-based revenue.
- Deal expected to close in H2 2026; accretive to adjusted EPS in first full year of ownership.
- CoStar plans cross-sell across commercial, residential, multifamily, lending; pairs Zonda's Envision with Matterport's spatial tech.
- Termination provision allows either party to exit if not closed by May 28, 2027.

## SEC filing metadata
- accession: 0001193125-26-246361
- form_type: 8-K
- ticker: CSGP
- cik: 0001057352
- company_name: COSTAR GROUP, INC.
- filed_at: 2026-05-29T12:05:09+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 1.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1057352/000119312526246361/0001193125-26-246361-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1057352/000119312526246361/d91732d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-246361
- JSON: https://secwatch.observer/filing/0001193125-26-246361.json
- Plain text: https://secwatch.observer/filing/0001193125-26-246361.txt

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