SEC INSIDER TRANSACTIONS

COSTAR GROUP, INC. (CSGP) Insider Transactions

Explore official ownership filings, with every record linked to its source.

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CSGP · COSTAR GROUP, INC.

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Roles: director,officer,ten_percent_owner,otherOwner nameOfficer titleOwnership: D, I, unknownoriginal or amendedTransaction fromTransaction throughFiled fromFiled throughMinimum quantityMaximum quantityMinimum priceMaximum priceMinimum calculated valueMaximum calculated valueResults per page (1–100)

OR within codes/roles; AND between categories. Roles apply to buyers and sellers. Owner predicates match the same owner. Missing values fail numeric/date filters. Value is quantity × reported price for non-derivative rows only; derivative values are unknown. Amendments stay separate; joint owners do not duplicate rows.

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Stale snapshot · Covered: filings 2026-10-15 to 2026-10-27 · 1 filings · fetched 2026-10-27T16:38:28Z

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Recent reported activity

0purchase rows on this page

0sale rows on this page

1matching filing rows

Purchases and sales count original non-derivative P and S rows. Awards, gifts, exercises, derivatives and amendments are shown separately and are not described as market purchases.

Transaction / filed	Reporting owner(s)	Code / security	Quantity	Price as filed	Ownership	Source
2026-10-15Filed 2026-10-16	Rossmann Robin JackOfficer · Chief Financial Officer Filing context Reported filing row; may be amended. Do not sum filings blindly. References:	F WithholdingCommon Stock, par value $0.01 per share · Non-derivative	756D	32	Direct	Form 4 ↗0001628280-26-066186

Imported instruments only. Joint owners do not multiply transactions. Amendments are separate filing rows, not additional trades. No aggregate trade totals are implied.