CoStar (CSGP) Founder/CEO Andrew Florance Buys 83,300 Shares

What Happened

Andrew C. Florance, Founder, CEO and Director of CoStar Group (CSGP), purchased 83,300 shares in open-market transactions on August 4, 2026 at an average price of $29.89, for a total reported cost of $2,489,837. This was a purchase (transaction code P), which retail investors often view as a direct insider buy.

Key Details

• Transaction date: 2026-08-04; Form 4 filed: 2026-08-05 (timely filing).
• Price reported: $29.89 per share (average); total value: $2,489,837.
• Footnote F1: the $29.89 average reflects multiple trades with prices ranging $29.57 to $29.99.
• Shares owned after the transaction: not specified in the provided filing excerpt.
• Transaction type: Open-market purchase (P). Not reported as part of a 10b5-1 plan or as a gift/option exercise in the excerpt.

Context

Open-market purchases by a company founder/CEO are generally viewed as a positive insider buy signal, but they don't guarantee future performance. This filing appears timely (filed the next day) and straightforward — a direct purchase of common stock rather than an option exercise or award.