CSGP
CoStar Group, Inc.
CoStar Group, Inc. insider trading
Every time one of CSGP's executives or directors buys or sells the stock, the filing appears here the moment it reaches the SEC — with grants and option exercises set apart from the trades that cost the insider their own money.
SEC Form 4 data, Q3 2024 to Q2 2026
CSGP insider trading by quarter
Between Jul 01, 2024 and Jun 30, 2026, 9 insiders traded CSGP on the open market: 7 purchases worth $7.1M and 14 sales worth $13.7M. In the last four quarters alone: 6 purchases ($6M) and 5 sales ($5.1M), by 6 insiders.
| Quarter | Bought | Sold | Insiders |
|---|---|---|---|
| Q2 2026 | +$2.5M2 buys | — | |
| Q1 2026 | +$3.5M4 buys | — | |
| Q4 2025 | — | −$281.2K2 sales | |
| Q3 2025 | — | −$4.8M3 sales | |
| Q2 2025 | — | −$2M1 sale | |
| Q1 2025 | — | −$139.7K1 sale | |
| Q4 2024 | +$1.1M1 buy | −$6.2M5 sales | |
| Q3 2024 | — | −$197.4K2 sales |
- Largest purchase
- +$2.5M of CSGP by Florance Andrew C (President and CEO · Director) on Feb 27, 2026.
- Largest sale
- −$5.4M of CSGP by Klein Michael R (Director) on Oct 25, 2024.
Open-market transactions through Jun 30, 2026most recent first
Florance Andrew C
President and CEO · Director
+$2.4M
May 01, 2026
68,330 sh · $35.17
Florance Andrew C
President and CEO · Director
+$111K
May 01, 2026
3,100 sh · $35.82
Sams Louise S
Director
+$48.4K
Mar 06, 2026
1,000 sh · $48.36
Saint Frederick G.
President, Marketplaces
+$906.6K
Mar 02, 2026
20,000 sh · $45.33
Glaser Rachel C
Director
+$44.9K
Mar 02, 2026
1,000 sh · $44.94
Florance Andrew C
President and CEO · Director
+$2.5M
Feb 27, 2026
55,720 sh · $44.52
Hill John W
Director
−$154.5K
Nov 13, 2025
2,250 sh · $68.68
Cann Cynthia Cammett
Chief Accounting Officer
−$126.6K
Nov 13, 2025
1,841 sh · $68.79
Saint Frederick G.
President, Marketplaces
−$2.3M
Aug 28, 2025
25,000 sh · $90.33
Saint Frederick G.
President, Marketplaces
−$2.3M
Jul 28, 2025
25,000 sh · $93.23
Cann Cynthia Cammett
Chief Accounting Officer
−$188.8K
Jul 28, 2025
2,033 sh · $92.85
Saint Frederick G.
President, Marketplaces
−$2M
Jun 11, 2025
25,000 sh · $81.10
Cann Cynthia Cammett
Chief Accounting Officer
−$139.7K
Mar 10, 2025
1,749 sh · $79.90
Hill John W
Director
−$209.9K
Dec 10, 2024
2,735 sh · $76.76
Nassetta Christopher J
Director
−$135.1K
Nov 27, 2024
1,681 sh · $80.39
| Date | Insider | Shares | Price | Value |
|---|---|---|---|---|
| May 01, 2026 | Florance Andrew CPresident and CEO · Director | 68,330 | $35.17 | +$2.4M |
| May 01, 2026 | Florance Andrew CPresident and CEO · Director | 3,100 | $35.82 | +$111K |
| Mar 06, 2026 | Sams Louise SDirector | 1,000 | $48.36 | +$48.4K |
| Mar 02, 2026 | Saint Frederick G.President, Marketplaces | 20,000 | $45.33 | +$906.6K |
| Mar 02, 2026 | Glaser Rachel CDirector | 1,000 | $44.94 | +$44.9K |
| Feb 27, 2026 | Florance Andrew CPresident and CEO · Director | 55,720 | $44.52 | +$2.5M |
| Nov 13, 2025 | Hill John WDirector | 2,250 | $68.68 | −$154.5K |
| Nov 13, 2025 | Cann Cynthia CammettChief Accounting Officer | 1,841 | $68.79 | −$126.6K |
| Aug 28, 2025 | Saint Frederick G.President, Marketplaces | 25,000 | $90.33 | −$2.3M |
| Jul 28, 2025 | Saint Frederick G.President, Marketplaces | 25,000 | $93.23 | −$2.3M |
| Jul 28, 2025 | Cann Cynthia CammettChief Accounting Officer | 2,033 | $92.85 | −$188.8K |
| Jun 11, 2025 | Saint Frederick G.President, Marketplaces | 25,000 | $81.10 | −$2M |
| Mar 10, 2025 | Cann Cynthia CammettChief Accounting Officer | 1,749 | $79.90 | −$139.7K |
| Dec 10, 2024 | Hill John WDirector | 2,735 | $76.76 | −$209.9K |
| Nov 27, 2024 | Nassetta Christopher JDirector | 1,681 | $80.39 | −$135.1K |
From SEC's quarterly Form 3, 4 and 5 data sets: code P purchases and code S sales of common stock, by the date the trade happened. Where a fund and the people who control it each report the same block, it is counted once. Trades made in the last days of Q2 2026 but filed after it closed arrive with SEC's next quarterly release.
After insiders bought CSGP
What the stock actually did in the 90 days following each open-market purchase
Don't check CSGP — let it ping you
Get told the moment an insider moves on CSGP
Pro watches CoStar Group, Inc. for you and sends a Telegram ping within moments of a Form 4 clearing EDGAR — a C-suite open-market buy, a cluster, a 10b5-1 regime break — long before it reaches the press. Add CSGP to a watchlist, see each mover's benchmark-measured track record and which legendary funds hold it, and read the full filing history instead of the last 72 hours.
The live dashboard is free to open. Alerts, watchlists, full filing history and each mover's benchmark-measured track record are Pro. Monitoring, not advice.
How to read CSGP insider activity
- Open-market purchase (code P)
- An insider spending their own money at market price. This is the only buy code that reliably carries signal — it is a decision, not compensation.
- Grants and option exercises (codes A, M)
- Scheduled compensation. Most "insider buying" headlines are really this, which is why InsiderPulse weights it at a fraction of a real purchase.
- Cluster buy
- Two or more different insiders buying on the open market in the same window. One executive buying can mean anything; three is much harder to explain away.
Other Real Estate tickers
Questions
- How much CSGP stock have insiders bought and sold in the last two years?
- Between Jul 01, 2024 and Jun 30, 2026, 9 CoStar Group, Inc. insiders made 7 open-market purchases worth $7.1M and 14 sales worth $13.7M. In the four quarters to Jun 30, 2026: 6 purchases ($6M) and 5 sales ($5.1M). The largest purchase was Florance Andrew C buying $2.5M on Feb 27, 2026. The largest sale was Klein Michael R selling $5.4M on Oct 25, 2024.
- Where does CSGP insider trading data come from?
- From the Form 4 filings CoStar Group, Inc.'s officers, directors and 10% owners must send the SEC within two business days of a trade. Each row on this page links to its original filing on SEC EDGAR. Share grants and option exercises are kept apart from open-market purchases and sales, because only the latter cost the insider their own money.
Get the free Insider Brief
Each weekday evening: the day's biggest open-market insider buys, cluster formations and 10b5-1 plan breaks — in plain English, with grants and routine vesting stripped out. Honest about what the data can and cannot say.