SEC Form 4
CoStar Group Inc (CSGP) insider trading
In the 12 months to Oct 30, 2026, 2 CSGP insiders reported open-market sales of $534.3K across 4 filings; 4 insiders bought $8.5M.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $534.3K
- 4 filings · 2 insiders
- Open-market purchases
- $8.5M
- 6 filings
Who traded CSGP, and when
- Purchase
- Sale
CSGP daily close from Oct 30, 2025 to Oct 29, 2026, between $26.95 and $70.44, last $28.14. 4 sale and 6 purchase filings by 6 insiders, marked at their filing dates. Andrew C. Florance, President and CEO → Founder and CEO: bought $7.5M across 3 filings, first filed Mar 2, 2026, last Aug 5, 2026. Frederick G. Saint, President, Marketplaces: bought $906.6K across 1 filing, first filed Mar 3, 2026, last Mar 3, 2026. Cynthia Cammett Cann, Chief Accounting Officer: sold $274.0K across 2 filings, first filed Nov 17, 2025, last Aug 10, 2026. John W. Hill, Director: sold $260.3K across 2 filings, first filed Nov 17, 2025, last Aug 10, 2026. Louise S. Sams, Director: bought $48.4K across 1 filing, first filed Mar 9, 2026, last Mar 9, 2026. Rachel C. Glaser, Director: bought $44.9K across 1 filing, first filed Mar 3, 2026, last Mar 3, 2026.
Largest mark · tap a row for others
Andrew C. Florance · President and CEO
Purchase $2,514,208
71,430 shares at $35.20 avg
Filed May 4, 2026 · traded May 1
Close on filing date $35.38
Andrew C. Florance · President and CEO → Founder and CEO
President and CEO → Founder and CEO
$7.5M boughtFrederick G. Saint · President, Marketplaces
President, Marketplaces
$906.6K boughtCynthia Cammett Cann · Chief Accounting Officer
Chief Accounting Officer
$274.0K soldJohn W. Hill · Director
Director
$260.3K soldLouise S. Sams · Director
Director
$48.4K boughtRachel C. Glaser · Director
Director
$44.9K boughtOpen-market trades
10 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Andrew C. Florance | President and CEO → Founder and CEO | — | $7.5M | 3 | — | |
| Frederick G. Saint | President, Marketplaces | — | $906.6K | 1 | — | |
| Cynthia Cammett Cann | Chief Accounting Officer | $274.0K | — | 2 | — | |
| John W. Hill | Director | $260.3K | — | 2 | — | |
| Louise S. Sams | Director | — | $48.4K | 1 | — | |
| Rachel C. Glaser | Director | — | $44.9K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | John W. Hill Director | Sale | 3,500 | $30.21 | $105.7K | 22,993 | |
traded | Cynthia Cammett Cann Chief Accounting Officer | Sale | 4,788 | $30.78 | $147.4K | 18,822 | |
traded | Andrew C. Florance Founder and CEO | Purchase | 83,300 | $29.89 | $2.5M | 1,806,165 | |
traded | Andrew C. Florance President and CEO | Purchase | 71,430 | $35.20 | $2.5M | 1,719,765 | |
traded | Louise S. Sams Director | Purchase | 1,000 | $48.36 | $48.4K | 20,409 | |
traded | Rachel C. Glaser Director | Purchase | 1,000 | $44.94 | $44.9K | 4,157 | |
traded | Frederick G. Saint President, Marketplaces | Purchase | 20,000 | $45.33 | $906.6K | 279,851 | |
traded | Andrew C. Florance President and CEO | Purchase | 55,720 | $44.52 | $2.5M | 1,586,866 | |
traded | Cynthia Cammett Cann Chief Accounting Officer | Sale | 1,841 | $68.79 | $126.6K | 23,211 | |
traded | John W. Hill Director | Sale | 2,250 | $68.68 | $154.5K | 18,231 |
GET /stocks/filings/vX/form-4?tickers=CSGP&filing_date.gte=2025-10-30&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CSGP"
],
"issuer_cik": "0001057352",
"owner_cik": "0001351689",
"accession_number": "0001351689-26-000005",
"form_type": "4",
"filing_date": "2026-08-10",
"period_of_report": "2026-08-05",
"issuer_name": "COSTAR GROUP, INC.",
"issuer_trading_symbol": "CSGP",
"owner_name": "Hill John W",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock, par value $0.01 per share",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-05",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 3500,
"transaction_price_per_share": 30.21,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 22993,
"transaction_value": 105735,
"not_subject_to_section_16": false,
"direct_or_indirect": "D"
},
{
"tickers": [
"CSGP"
],
"issuer_cik": "0001057352",
"owner_cik": "0001472762",
"accession_number": "0001472762-26-000012",
"form_type": "4",
"filing_date": "2026-08-10",
"period_of_report": "2026-08-07",
"issuer_name": "COSTAR GROUP, INC.",
"issuer_trading_symbol": "CSGP",
"owner_name": "Cann Cynthia Cammett",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Accounting Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock, par value $0.01 per share",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-07",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 4788,
"transaction_price_per_share": 30.78,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 18822,
"transaction_value": 147374.64,
"not_subject_to_section_16": false,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 42 records
- Tax withholding26 records
- Grants and awards12 records
- Other4 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Role
- The title on each filing. Someone whose title changed shows more than one.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has CoStar Group Inc's CEO sold stock?
No. Andrew C. Florance (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is CSGP’s insider data?
These are CSGP Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
Build with AI
Track CSGP insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for CSGP every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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