COSTAR GROUP, INC. (CSGP) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-07-06

COSTAR GROUP, INC. (CSGP) has filed 10 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-06. 4 Form 8-K material event filings were reported by CSGP in the last 90 days. InsiderAlpha tracks every CSGP SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About COSTAR GROUP, INC. (CSGP)

SEC CIK0001057352

90-Day SEC Filing Activity

Form 4 filings (90d)10
Form 8-K filings (90d)4
Latest Form 4 filing2026-07-06

Recent CSGP Insider Transactions (Form 4)

DateInsiderRoleTransactionSharesPriceValueFiling
LOWN CHRISTIAN M.Chief Financial OfficerF — Tax withholding / forfeiture5.6K$29.36$164KSEC
Brunner Angelique G.DirectorA — Grant or award8.3K$0.00—SEC
Hill John WDirectorA — Grant or award8.3K$0.00—SEC
Glaser Rachel CDirectorA — Grant or award8.3K$0.00—SEC
Sams Louise SDirectorA — Grant or award8.3K$0.00—SEC
Musslewhite Robert WDirectorA — Grant or award8.3K$0.00—SEC
McCarthy Christine MDirectorA — Grant or award8.3K$0.00—SEC
BERISFORD JOHN LDirectorA — Grant or award8.3K$0.00—SEC
Cann Cynthia CammettChief Accounting OfficerF — Tax withholding / forfeiture461$32.04$15KSEC
FLORANCE ANDREW CPresident and CEOP — Open-market purchase68.3K$35.17$2.40MSEC
FLORANCE ANDREW CPresident and CEOP — Open-market purchase3.1K$35.82$111KSEC
Cann Cynthia CammettChief Accounting OfficerF — Tax withholding / forfeiture1.2K$43.63$52KSEC
DESMARAIS MICHAEL JChief Human Resources OfficerF — Tax withholding / forfeiture2.9K$43.63$125KSEC
Ruggles LisaSenior VP, Global OperationsF — Tax withholding / forfeiture3.0K$43.63$130KSEC
Boxer GeneGeneral Counsel and SecretaryF — Tax withholding / forfeiture428$43.63$19KSEC

All transactions sourced from SEC EDGAR Form 4 filings for COSTAR GROUP, INC. (CSGP). Updated in real time as new filings are submitted to the SEC.

Most-Active CSGP Insiders — Last 90 Days

InsiderForm 4 filingsTotal transaction value
FLORANCE ANDREW C2$2.51M
LOWN CHRISTIAN M.1$164K
Cann Cynthia Cammett1$15K
Hill John W1—
Musslewhite Robert W1—

Recent CSGP Form 8-K Material Events

Recent Insider Filings

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in CSGP insider filings:

POpen-market purchase by the insider
SOpen-market sale by the insider
AGrant, award, or other acquisition from the issuer
MExercise or conversion of derivative security (e.g. options)
FPayment of exercise price or tax liability via share withholding
GBona-fide gift of securities
DDisposition to the issuer (e.g. share buyback participation)
JOther acquisition or disposition
XExercise of in-the-money or at-the-money derivative security
CConversion of derivative security
VTransaction voluntarily reported earlier than required

CSGP Insider Trading — FAQ

What is the latest insider trade for CSGP?
COSTAR GROUP, INC. (CSGP) had 10 insider filings in the last 90 days, with the most recent on 2026-07-06. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying CSGP stock?
0 insider purchases of CSGP were filed in the last 90 days.
How many insiders are selling CSGP stock?
0 insider sales of CSGP were filed in the last 90 days.
Where can I see CSGP SEC filings (Form 4, 10-K, 10-Q, 8-K)?
InsiderAlpha aggregates every CSGP SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

Learn More

Open the live CSGP dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.