Florance Andrew C buys $2.4M of CSGP

The Transaction

CoStar Group, Inc. (market cap $14.3B) President and CEO Andrew Florance purchased 68,330 shares of CSGP for $2,403,166 at $35.17 per share on May 1, 2026, per a Form 4 filed with the U.S. Securities and Exchange Commission on May 4, 2026. The same SEC filing also disclosed a secondary, same-filing-day purchase of 3,100 shares at $35.82 per share for $111,042, bringing Florance’s total disclosed open-market share buys in the filing to approximately $2.51 million.

Insider Context

This marks Florance’s first reported open-market insider trades since March 17, 2026, when seven company officers and directors received in-kind stock grants. No insider selling activity was recorded in the 90 days prior to the May 4 filing, making this a net discretionary allocation of personal capital by the company’s chief executive. The only other insider transactions in the window were fixed in-kind grants: Chief Technology Officer Simuro Frank received 11,107 shares, while Senior Vice President of Global Operations Ruggles Lisa received 2,977 shares, both valued at $43.63 per share.

Cross-Reference with Analysts and Institutions

As of May 1, 2026—the date of Florance’s primary share purchase—CSGP’s analyst rating distribution remained unchanged from the prior month, with 4 Strong Buy, 10 Buy, 4 Hold, 1 Sell, and 0 Strong Sell ratings across 16 covering analysts. For institutional positioning, the most recent 13F filing (December 31, 2025) showed 878 institutional holders owning 98.3% of CSGP’s float, with total holdings valued at $27.8 billion. During that fourth quarter, 375 institutions increased their CSGP positions, 392 reduced positions, 101 opened new stakes, and 157 closed existing positions. CSGP also beat consensus quarterly EPS and revenue estimates in its April 28, 2026, report, posting $0.23 EPS vs. a $0.18 consensus and $897 million in revenue vs. a $896.7 million estimate.

What This Transaction Does NOT Signal

1. This purchase does not signal a near-term update to company forward guidance: Florance’s trade was executed on May 1, prior to the May 4 and May 6 Business Wire industry data releases, with no public guidance amendments filed in the days surrounding the transaction.

2. This does not reflect broad insider consensus: Only Florance made voluntary open-market share purchases, while all prior reported insider activity in the prior 90 days was mandatory in-kind equity grants, not discretionary investments by all officers or directors.

3. This does not indicate a shift in recent institutional positioning: The most current 13F data is three months old, and no post-December 2025 institutional flow data was provided to confirm a change in institutional sentiment ahead of the trade.