Why CoStar Group, Inc. (CSGP) stock fell 14.0% on Wednesday, October 28, 2026
CoStar Group, Inc. (CSGP) closed at $27.54, down 13.96% on Wednesday, October 28, 2026, on volume of 18,295,448 shares (2.8× its 3-month average); market value about $11.20B.
What happened: primary sources
Events Nexqual found for CSGP on Wednesday, October 28, 2026 or the trading day before (October 27, 2026):
- Oct 27, 2026: Reported Q3 2026 results: adjusted EPS $0.38 vs consensus $0.34 (beat), revenue $952.0M vs consensus $959.4M (miss). Guidance: Full-year 2026 revenue guidance increased to $3.75 billion to $3.77 billion. source
- Oct 27, 2026: SEC 8-K: Entered a material agreement source
Quoted from the filing: “On October 27, 2026, CoStar Group, Inc. ("CoStar Group" or the "Company"), through its wholly owned subsidiaries, CoStar Realty Information, Inc., a Delaware corporation and Velocity Merger Sub, Inc, a Delaware corporation, entered into an Agreement and Plan of Merger (the "Merger Agreement") with Vexcel Group, Inc. a Delaware corporation (together with its subsidiaries, "Vexcel"), and Fortis Advisors LLC, a Delaware limited liability company, solely in its capacity as the stockholder representative, to acquire…” - Oct 28, 2026: JP Morgan: Target lowered, Overweight, price target $52 → $44
- Oct 28, 2026: Wells Fargo: Target raised, Underweight, price target $25 → $26
- Oct 28, 2026: Needham: Reiterated, Buy, price target $40
- Oct 28, 2026: BTIG: Target lowered, Buy, price target $42 → $35
These are listed as context. A filing or rating change on the same day is not proof that it caused the move; read the source.
More on CSGP
CSGP stock page: price, SEC financials, insider trades, superinvestor holders, analyst estimates and options. Other big moves that day: October 28, 2026.
Sources: SEC EDGAR, Nexqual Earnings Flash, analyst rating changes, Nexqual market data. Built October 28, 2026 at 22:04 UTC. Not investment advice.
Data source: Nexqual. Last updated: October 28, 2026 at 22:04 UTC. This page is informational and not investment advice.
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