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Costar Group, Inc. (CSGP)

Costar Group, Inc. (CSGP) Insider Trading

Directors, officers and holders of more than 10% of CSGP report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 132 transactions on file: 7 with code P, 2 with code S and 41 with other codes.

DateInsiderCodeShares
Oct 15, 2026Rossmann Robin JackF Tax Payment756
Aug 7, 2026Cann Cynthia CammettS Sale4,788
Aug 5, 2026Hill John WS Sale3,500
Aug 4, 2026FLORANCE ANDREW CP Purchase83,300
Aug 1, 2026Cann Cynthia CammettF Tax Payment1,077
Aug 1, 2026SAINT FREDERICK G.F Tax Payment1,436
Jul 31, 2026Cann Cynthia CammettA Award26,078
Jul 31, 2026Rossmann Robin JackA Award34,771
Jul 1, 2026LOWN CHRISTIAN M.F Tax Payment5,597
Jun 23, 2026Brunner Angelique G.A Award8,262
Jun 23, 2026Hill John WA Award8,262
Jun 23, 2026Musslewhite Robert WA Award8,262
Jun 23, 2026Glaser Rachel CA Award8,262
Jun 23, 2026McCarthy Christine MA Award8,262
Jun 23, 2026BERISFORD JOHN LA Award8,262
Jun 23, 2026Sams Louise SA Award8,262
Jun 15, 2026Cann Cynthia CammettF Tax Payment461
May 1, 2026FLORANCE ANDREW CP Purchase3,100
May 1, 2026FLORANCE ANDREW CP Purchase68,330
Mar 15, 2026Boxer GeneF Tax Payment482
Mar 15, 2026Ruggles LisaF Tax Payment2,977
Mar 15, 2026SIMURO FRANKF Tax Payment11,107
Mar 15, 2026Boxer GeneF Tax Payment428
Mar 15, 2026DESMARAIS MICHAEL JF Tax Payment2,873
Mar 15, 2026Cann Cynthia CammettF Tax Payment1,194
Mar 10, 2026FLORANCE ANDREW CA Award124,162
Mar 10, 2026LOWN CHRISTIAN M.A Award12,268
Mar 10, 2026Cann Cynthia CammettA Award4,374
Mar 10, 2026DESMARAIS MICHAEL JA Award17,676
Mar 10, 2026Boxer GeneA Award21,920
Mar 6, 2026Sams Louise SP Purchase1,000
Mar 2, 2026SAINT FREDERICK G.P Purchase20,000
Mar 2, 2026Glaser Rachel CP Purchase1,000
Mar 1, 2026SAINT FREDERICK G.F Tax Payment11,096
Mar 1, 2026LOWN CHRISTIAN M.F Tax Payment7,175
Mar 1, 2026FLORANCE ANDREW CF Tax Payment59,593
Mar 1, 2026Boxer GeneF Tax Payment4,547
Mar 1, 2026SIMURO FRANKF Tax Payment18,702
Mar 1, 2026DESMARAIS MICHAEL JF Tax Payment6,353
Mar 1, 2026Cann Cynthia CammettF Tax Payment1,385
Mar 1, 2026Ruggles LisaF Tax Payment8,931
Feb 27, 2026LOWN CHRISTIAN M.A Award39,652
Feb 27, 2026SIMURO FRANKA Award52,869
Feb 27, 2026FLORANCE ANDREW CP Purchase55,720
Feb 27, 2026DESMARAIS MICHAEL JA Award17,926
Feb 27, 2026Cann Cynthia CammettA Award6,834
Feb 27, 2026SAINT FREDERICK G.A Award39,652
Feb 27, 2026FLORANCE ANDREW CA Award83,708
Feb 27, 2026Boxer GeneA Award26,888
Feb 27, 2026Ruggles LisaA Award28,197

The full Form 4 history is on the CSGP company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.