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See how Context works →On the price, the facts of the public record■Insider buy□Insider sell●Results filed
With an account, also○dividends▲splits◌next earningswith an account
End-of-day prices provided by Twelve Data · One close per session; the series does not update during the trading day.
Latest on record
The most recent facts, as filed.
Up to three of the most recent, checkable facts already loaded on this page, each linked to its source.
- Aug 21, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
- Aug 7, 2026Reported sale · Form 4Cynthia Cammett Cann, Chief Accounting Officer · $147.4KOpen the filing ↗
- Aug 5, 2026Reported sale · Form 4John W Hill · $105.7KOpen the filing ↗
In numbers
What this profile holds, counted.
Closes · 1 year250
SEC filings on record1,4335 flagged findings
Reported transactions (Form 4)74since Feb 14, 2023 · and 10 other holdings
Corporate events (8-K)30since Oct 25, 2017
What the record says
Description, identity and filings, each with its source.
Every block cites its source. The colour of a finding marks its category — which document, who filed it — not how much it matters.
What the company does
CoStar Group, Inc. is an American provider of information, analytics, and marketing services to the commercial property industry in North America and Europe. Founded in 1987 by Andrew C. Florance and based in Arlington, Virginia, the company operates the CoStar online database and news website and several online marketplaces, including Apartments.com and Homes.com.
Source: Wikipedia (CC BY-SA 4.0) · copied on Sep 3, 2026 · may not reflect recent changes.
The 25 most recent filings (of 1,433)
Every SEC filing, newest first, with what it is. Below, each type with its own explanation.
- Oct 16, 26Form 4 ↗Insider transaction new
- Aug 21, 268-K ↗Current report · Communication to the market
- Aug 14, 26SCHEDULE 13G ↗Passive stake · Baron Capital Group, Inc. · 5.3% · event on Jun 30, 26
- Aug 5, 26Form 144 ↗Notice of proposed sale
- Aug 4, 26Form 3 ↗Insider transaction
- Jul 29, 2610-Q ↗Quarterly report
- Jul 28, 268-K ↗Current report · Results
- Jul 13, 268-K ↗Current report · A senior executive left or was appointed
- Jul 6, 26Form 4 ↗Insider transaction
- Jun 25, 268-K ↗Current report · A senior executive left or was appointed
Insider transaction · 8 Form 4 filingsshow all 8hide
- May 29, 268-K ↗Current report · Entered a material agreement
1,433 filings on record, the oldest from Jul 16, 98.
Listing the 25 most recent filings of the 1,433 on record.
15630
- Jul 13, 26A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Jun 25, 26A senior executive left or was appointed+3 more in the same filing8-K 5.02 ↗
- May 29, 26Entered a material agreement+2 more in the same filing8-K 1.01 ↗
4 senior executive changes2025 – 2026show all 4hide
- Mar 16, 26A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Feb 13, 26A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Jan 7, 26A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Jun 27, 25A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- May 9, 25Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- Apr 7, 25Entered a material agreement+3 more in the same filing8-K 1.01 ↗
- Feb 28, 25Completed an acquisition or disposal+2 more in the same filing8-K 2.01 ↗
- Jul 11, 24A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Jun 18, 24A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- May 31, 24Took on a new financial obligation+2 more in the same filing8-K 2.03 ↗
- Apr 22, 24Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- Feb 20, 24A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
12 older filings not shown · The record reaches back to Nov 29, 04.
Stress disclosures older than the timeline above. They are individual events from the record, not a complete timeline: there may be more between them.
- Jul 21, 05Restructuring plan with committed costs+1 more in the same filing8-K 2.05 ↗
The full record holds 1 stress filing.
Corporate events are tracked from 2004-08-23, when the SEC renumbered 8-K items. Earlier filings use an incompatible numbering and are not classified here.
Schedule 13G: short-form filing
The short form, for holders who meet specific requirements: institutional investors, passive investors without a control purpose, or exempt investors. Asset managers and index funds usually file it.
- Vanguard Portfolio Management9.1%Mar 31, 26SCHEDULE 13G ↗
- Vanguard Capital Management7.5%Mar 31, 26SCHEDULE 13G ↗
- BlackRock, Inc.7.5%Mar 31, 25SCHEDULE 13G/A ↗
- Baron Capital Group, Inc.5.3%Jun 30, 26SCHEDULE 13G ↗4 co-filers on this document — the figure is the largest single stake, not their sum.
Structured 13D/G data starts 2023-12, when the SEC moved these filings to a machine-readable format. Earlier filings exist but are not parsed here.
Sale intention announced
On Aug 5, Hill John W filed notice of intent to sell up to $106K.
A notice is not a sale: it may not go ahead, may happen in part, or at a different price.
After the notice, they sold $106K on Aug 5, per their Form 4. That is 100% of the shares announced so far, and the window is still open.
- Aug 7, 26Sell$147KCynthia Cammett CannChief Accounting Officer↗
- Aug 5, 26Sell$106KJohn W Hill↗
- Aug 4, 26Buy$2.5MANDREW C FLORANCEFounder and CEO↗
- May 1, 26Buy$2.4MANDREW C FLORANCEPresident and CEO↗
- May 1, 26Buy$111KANDREW C FLORANCEPresident and CEO↗
- Mar 6, 26Buy$48KLouise S Sams↗
- Mar 2, 26Buy$45KRachel C Glaser↗
- Mar 2, 26Buy$907KFREDERICK G. SAINTPresident, Marketplaces↗
- Feb 27, 26Buy$2.5MANDREW C FLORANCEPresident and CEO↗
Stock compensation, tax and giftsshow the 31 other transactionshide
Stock compensation, tax withholding, option exercises and gifts. They are listed separately and are not included in the purchase and sale totals. The type describes the transaction, not the filer's intent.
- Oct 15, 26Tax$24KRobin Jack RossmannChief Financial Officer↗
- Aug 1, 26Tax$31KCynthia Cammett CannChief Accounting Officer↗
- Aug 1, 26Tax$41KFREDERICK G. SAINTPresident, Marketplaces↗
- Jul 1, 26Tax$164KCHRISTIAN M. LOWNChief Financial Officer↗
- Jun 23, 26Compensationamount n/aJohn W Hill↗
- Jun 23, 26Compensationamount n/aRobert W Musslewhite↗
- Jun 23, 26Compensationamount n/aJOHN L BERISFORD↗
- Jun 23, 26Compensationamount n/aRachel C Glaser↗
- Jun 23, 26Compensationamount n/aChristine M McCarthy↗
- Jun 23, 26Compensationamount n/aAngelique G. Brunner↗
- Jun 23, 26Compensationamount n/aLouise S Sams↗
- Jun 15, 26Tax$15KCynthia Cammett CannChief Accounting Officer↗
- Mar 15, 26Tax$52KCynthia Cammett CannChief Accounting Officer↗
- Mar 15, 26Tax$130KLisa RugglesSenior VP, Global Operations↗
- Mar 15, 26Tax$21KGene BoxerGeneral Counsel and Secretary↗
- Mar 15, 26Tax$125KMICHAEL J DESMARAISChief Human Resources Officer↗
- Mar 15, 26Tax$485KFRANK SIMUROChief Technology Officer↗
- Mar 10, 26Compensationamount n/aANDREW C FLORANCEPresident and CEO↗
- Mar 10, 26Compensationamount n/aCynthia Cammett CannChief Accounting Officer↗
- Mar 10, 26Compensationamount n/aCHRISTIAN M. LOWNChief Financial Officer↗
- Mar 10, 26Compensationamount n/aGene BoxerGeneral Counsel and Secretary↗
- Mar 10, 26Compensationamount n/aMICHAEL J DESMARAISChief Human Resources Officer↗
- Mar 1, 26Tax$2.7MANDREW C FLORANCEPresident and CEO↗
- Mar 1, 26Tax$62KCynthia Cammett CannChief Accounting Officer↗
- Mar 1, 26Tax$495KFREDERICK G. SAINTPresident, Marketplaces↗
- Mar 1, 26Tax$320KCHRISTIAN M. LOWNChief Financial Officer↗
- Mar 1, 26Tax$399KLisa RugglesSenior VP, Global Operations↗
- Mar 1, 26Tax$203KGene BoxerGeneral Counsel and Secretary↗
- Mar 1, 26Tax$284KMICHAEL J DESMARAISChief Human Resources Officer↗
- Mar 1, 26Tax$835KFRANK SIMUROChief Technology Officer↗
- Feb 19, 26Otheramount n/aANDREW C FLORANCEPresident and CEO↗
The full record holds 249 transactions and goes back to Oct 28, 22.
Its sector and its market
CoStar Group, Inc. among Real Estate companies
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- 250 clean closes in the period.
- SEC records
- 1,433 documents on file, from Jul 16, 1998 to Oct 16, 2026.
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- Wikipedia, read on Sep 3, 2026.
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- Generated on Oct 19, 2026; refreshed through the day.
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Those filed with the SEC by the company, its insiders and its major shareholders, within our coverage: periodic reports (10-K, 10-Q, 20-F), material events (8-K), proposed sale notices (Form 144), insider transactions (Form 4) and stakes above 5% (13D/13G). Each links to the original on EDGAR.
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