FLORANCE ANDREW C 4

What Happened
Andrew C. Florance, President, CEO and a director of CoStar Group (CSGP), made two open-market purchases on May 1, 2026 (transaction code P). He bought 68,330 shares at $35.17 each for $2,403,166 and 3,100 shares at $35.82 each for $111,042 — about 71,430 shares for a combined ~$2,514,208. These were purchases (acquisitions), which are commonly viewed as a direct insider buy.

Key Details

• Transaction date: 2026-05-01 (open-market purchases, code P)
• Prices and amounts: 68,330 shares @ $35.17 ($2,403,166); 3,100 shares @ $35.82 ($111,042)
• Total purchased: 71,430 shares for ~ $2.51 million
• Shares owned after transaction: Not specified in the Form 4 excerpt provided
• Footnotes in the filing: F1 — "Average based on sales prices ranging from $34.67 to $35.67." F2 — "Average based on sales prices ranging from $35.68 to $36.00." (These appear in the filing; they reference average prices used elsewhere in the report.)
• Filing timeliness: Form filed 2026-05-04 for a 2026-05-01 transaction (filed within the SEC’s typical two business-day window)

Context
Open-market purchases are straightforward acquisitions of stock (no option exercise or award). Purchases by CEOs are often watched by investors as a positive signal, but they do not by themselves explain motivation. No 10b5-1 plan, gift, or derivative exercise was indicated in the provided details.