CSGP Congressional Stock Trades & Insider Buying (2026)

CSGP insider buying and selling over the past year

Over the past year COSTAR GROUP, INC. insiders filed 6 open-market Form 4 trades — 4 purchases worth $3.48M and 2 sales worth $281.2K — which makes them net buyers by $3.20M.

None of the 2 sales were flagged as Rule 10b5-1 plan trades, meaning each one was a discretionary decision at the time of filing. Activity clustered in 2026-03 (3 trades) and 2025-11 (2 trades); the latest filing in this window is dated 2026-03-06. The average open-market sale price was $68.73; the last close of $32.31 is 53.0% below that level, so sellers exited above the current price. The single largest trade was a purchase of 55,720 shares worth $2.48M on 2026-02-27. Since the most recent filing the stock has moved -33.2%, from $48.38. Insiders paid an average of $44.78 per share for their open-market purchases; against the last close of $32.31 that cost basis is under water at -27.9%.

Where CSGP trades relative to its one-year range

COSTAR GROUP, INC. closed at $32.31 on 2026-10-16, inside a one-year range of $26.95 to $78.23. That puts the stock near the bottom of its range, at 10.5% of the distance from low to high. Over one year the share price moved -56.5%, and over roughly three months +8.5%. Average daily volume over the last month was about 6,085,095 shares.

Across 209 companies in the same SEC industry group (SIC 73) with a full year of prices in Gemral Edge, the median one-year return was -10.2%. CSGP is behind that median and beat 7% of that peer group on this measure.

Members of Congress who traded CSGP

STOCK Act disclosures show 45 trades in CSGP by 8 members of Congress over five years (29 purchases, 16 sales), most recently on 2026-09-25. The most active traders were Ro Khanna (D-CA), 23 trades; Gilbert Ray Cisneros, Jr. (D-CA), 13 trades; Lisa C. McClain (R-MI), 3 trades; Jefferson Shreve (R-IN), 2 trades; Daniel S. Goldman (D-NY), 1 trade.

By party the trades split 39 by Democrats, 6 by Republicans; by chamber, 45 from the House.

Compare CSGP with indexed peers from the same industry group

These peers have full Gemral Edge dossiers and the closest one-year price move to CSGP:

• CRWV one-year return -56.7%
• APP one-year return -56.1%
• ORCL one-year return -59.0%
• FISV one-year return -59.7%
• FICO one-year return -52.4%

Sources and method

Every figure above is computed from public filings stored in Gemral Edge, not estimated. Insider figures count only open-market purchases and sales reported on SEC Form 4; option exercises, grants and gifts are excluded because they do not reflect a decision to buy or sell at market prices.

• SEC EDGAR Form 4 (edge_insider_trades, codes P/S open-market only) — as of 2026-03-06
• edge_prices_eod (end-of-day close) — as of 2026-10-16
• House PTR / Senate eFD disclosures (edge_congress_trades) — as of 2026-09-25

CSGP data questions

Are CSGP insiders buying or selling stock?

Over the past year COSTAR GROUP, INC. insiders filed 6 open-market Form 4 trades — 4 purchases worth $3.48M and 2 sales worth $281.2K — which makes them net buyers by $3.20M.

What is the one-year price range for CSGP?

Based on end-of-day closes through 2026-10-16, CSGP traded between $26.95 and $78.23, last closing at $32.31.

Has any member of Congress traded CSGP stock?

Yes. 8 members disclosed 45 trades in CSGP over five years; the most recent disclosed trade date is 2026-09-25.