CSGP
COSTAR GROUP, INC. · Services · Market cap $13.3B
Insiders bought $2.2M net in the last 90 days ·2 sellers, 1 buyer· latest Form 4 filed Aug 10, 2026
Insider Buying
$8.5M
reported purchases (SEC code P)
Insider Selling
$534K
reported sales (SEC code S)
Unique Insiders
6
in the rolling window
Latest filing
Oct 16, 2026
Hill John W
COSTAR GROUP, INC. (CSGP) has 48 SEC Form 4 filings (54 transaction rows) in the rolling window, disclosed by 6 distinct insiders. Most recent filing: Oct 16, 2026.
Inside the rolling window, 6 insiders at COSTAR GROUP, INC. reported 6 open-market purchases totaling $8.5M and 4 open-market sales totaling $534K. The most active filer is Founder and CEO FLORANCE ANDREW C with 3 filings. Insiders have net bought $4.8M over the trailing 6 months. The largest single insider purchase in this window was $2.5M by President and CEO FLORANCE ANDREW C on May 1, 2026. The most recent open-market filing is a sale of 3,500 shares by Director Hill John W, dated Aug 5, 2026, worth $106K.
- Industry:Real Estate - Services
- CEO:Andrew C. Florance
- Employees:8,441
- HQ:Arlington, VA, US
- IPO:1998-07-01
| Source | |||||||
|---|---|---|---|---|---|---|---|
Hill John WFirst in 9 months | Director | Sale | 3,500 | $106K | Aug 10 | +4.5% | SEC ↗ |
Cann Cynthia CammettFirst in 9 months | Chief Accounting Officer | Sale | 4,788 | $147K | Aug 10 | +4.5% | SEC ↗ |
FLORANCE ANDREW CFirst in 3 months | Founder and CEO | Purchase | 83,300 | $2.5M | Aug 5 | +8.9% | SEC ↗ |
| President and CEO | Purchase | 71,430 | $2.5M | May 4 | -7.0% | SEC ↗ | |
Sams Louise SFirst filing | Director | Purchase | 1,000 | $48K | Mar 9 | -32.1% | SEC ↗ |
SAINT FREDERICK G.First filing | President, Marketplaces | Purchase | 20,000 | $907K | Mar 3 | -29.7% | SEC ↗ |
Glaser Rachel CFirst filing | Director | Purchase | 1,000 | $45K | Mar 3 | -29.7% | SEC ↗ |
FLORANCE ANDREW CFirst filing | President and CEO | Purchase | 55,720 | $2.5M | Mar 2 | -27.2% | SEC ↗ |
Hill John WFirst filing | Director | Sale | 2,250 | $155K | Nov 17 | -50.9% | SEC ↗ |
Cann Cynthia CammettFirst filing | Chief Accounting Officer | Sale | 1,841 | $127K | Nov 17 | — | SEC ↗ |
Earnings: last 7 quarters
Congress trading CSGP 66 all-time
- DRep. Gilbert CisnerosPurchase$1,001 - $15,0002026-08-19
- DRep. Gilbert CisnerosSale$1,001 - $15,0002026-04-14
- DRep. Gilbert Ray CisnerosSale$1,001 - $15,0002026-04-14
- DRep. Gilbert Ray CisnerosSale$1,001 - $15,0002026-04-14
- DRep. Gilbert Ray CisnerosPurchase$1,001 - $15,0002026-03-13
- DRep. Gilbert Ray CisnerosPurchase$1,001 - $15,0002026-01-28
STOCK Act disclosures are filed up to 45 days after the trade. Amount is a disclosed range, not an exact figure.
Frequently asked questions
How many SEC Form 4 insider filings does CSGP have?
COSTAR GROUP, INC. (CSGP) has 48 SEC Form 4 filings (54 transaction rows) in the rolling 365-day window, disclosed by 6 distinct insiders. Most recent filing: Oct 16, 2026.
When was the most recent SEC Form 4 filing for CSGP?
The most recent Form 4 filing for CSGP on Tracefour is dated Oct 16, 2026.
Who is the most active insider at CSGP?
The most active SEC Form 4 filer at CSGP in the rolling window is Founder and CEO FLORANCE ANDREW C, with 3 filings.
What is the net insider flow at CSGP over the last 6 months?
Over the trailing 180 days, insiders at CSGP have net bought $4.8M based on SEC Form 4 disclosures.
What was the largest insider purchase at CSGP?
The largest single insider open-market purchase at CSGP in the rolling window was $2.5M by President and CEO FLORANCE ANDREW C on 2026-05-01.
What is the total insider buy and sell value at CSGP in the current window?
Inside the rolling window, insiders at CSGP bought $8.5M and sold $534K based on SEC Form 4 filings.
Can I get alerts for CSGP insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at COSTAR GROUP, INC. (CSGP). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
COSTAR GROUP, INC. is in the Services sector.