CSGP

Costar Group, INC.

Insider trading activity for Costar Group, INC., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

+$2.2M

net buying

Bought(1 · 1 insiders): $2.5M
Sold(2 · 2 insiders): $253.1K

Past 6 months

+$4.8M

net buying

Bought(3 · 1 insiders): $5M
Sold(2 · 2 insiders): $253.1K

Past 12 months

+$8M

net buying

Bought(7 · 4 insiders): $8.5M
Sold(4 · 2 insiders): $534.3K

Transaction history

The 78 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Aug 7	Cann Cynthia Cammett	Chief Accounting Officer	SSELL	4,788	$30.78	$147.4K	-20.3%	Open the original filing on SEC.gov
Aug 5	Hill John W	Director	SSELL	3,500	$30.21	$105.7K	-13.2%	Open the original filing on SEC.gov
Aug 4	Florance Andrew C	Founder and CEO	PBUY↓	83,300	$29.89	$2.5M	+4.8%	Open the original filing on SEC.gov
Aug 1	Saint Frederick G.	President, Marketplaces	FTAX	1,436	$28.76	$41.3K	-0.5%	Open the original filing on SEC.gov
Aug 1	Cann Cynthia Cammett	Chief Accounting Officer	FTAX	1,077	$28.76	$31K	-4.4%	Open the original filing on SEC.gov
Jul 31	Rossmann Robin Jack	Chief Financial Officer	AGRANT◆	34,771	—	—	—	Open the original filing on SEC.gov
Jul 31	Cann Cynthia Cammett	Chief Accounting Officer	AGRANT◆	26,078	—	—	—	Open the original filing on SEC.gov
Jul 1	Lown Christian M.	Chief Financial Officer	FTAX	5,597	$29.36	$164.3K	-4.1%	Open the original filing on SEC.gov
Jun 23	Sams Louise S	Director	AGRANT	8,262	—	—	+40.5%	Open the original filing on SEC.gov
Jun 23	McCarthy Christine M	Director	AGRANT	8,262	—	—	+248.6%	Open the original filing on SEC.gov
Jun 23	Glaser Rachel C	Director	AGRANT	8,262	—	—	+198.8%	Open the original filing on SEC.gov
Jun 23	Musslewhite Robert W	Director	AGRANT	8,262	—	—	+45.2%	Open the original filing on SEC.gov
Jun 23	Hill John W	Director	AGRANT	8,262	—	—	+45.3%	Open the original filing on SEC.gov
Jun 23	Brunner Angelique G.	Director	AGRANT	8,262	—	—	+81.3%	Open the original filing on SEC.gov
Jun 23	Berisford John L	Director	AGRANT	8,262	—	—	+277.9%	Open the original filing on SEC.gov
Jun 15	Cann Cynthia Cammett	Chief Accounting Officer	FTAX	461	$32.04	$14.8K	-1.8%	Open the original filing on SEC.gov
May 1	Florance Andrew C	President and CEO	PBUY	3,100	$35.82	$111K	+0.2%	Open the original filing on SEC.gov
May 1	Florance Andrew C	President and CEO	PBUY↓	68,330	$35.17	$2.4M	+4.1%	Open the original filing on SEC.gov
Mar 15	Boxer Gene	General Counsel and…	FTAX↺	482	$43.63	$21K	-0.5%	Open the original filing on SEC.gov
Mar 15	Simuro Frank	Chief Technology Officer	FTAX	11,107	$43.63	$484.6K	-2.6%	Open the original filing on SEC.gov
Mar 15	Desmarais Michael J	Chief Human Resources…	FTAX	2,873	$43.63	$125.3K	-3.2%	Open the original filing on SEC.gov
Mar 15	Ruggles Lisa	Senior VP, Global…	FTAX	2,977	$43.63	$129.9K	-1.7%	Open the original filing on SEC.gov
Mar 15	Cann Cynthia Cammett	Chief Accounting Officer	FTAX	1,194	$43.63	$52.1K	-4.5%	Open the original filing on SEC.gov
Mar 10	Desmarais Michael J	Chief Human Resources…	AGRANT	17,676	—	—	+24.2%	Open the original filing on SEC.gov
Mar 10	Lown Christian M.	Chief Financial Officer	AGRANT	12,268	—	—	+10.0%	Open the original filing on SEC.gov
Mar 10	Cann Cynthia Cammett	Chief Accounting Officer	AGRANT	4,374	—	—	+19.9%	Open the original filing on SEC.gov
Mar 10	Florance Andrew C	President and CEO	AGRANT	124,162	—	—	+8.1%	Open the original filing on SEC.gov
Mar 10	Boxer Gene	General Counsel and…	AGRANT	21,920	—	—	+29.6%	Open the original filing on SEC.gov
Mar 6	Sams Louise S	Director	PBUY★	1,000	$48.36	$48.4K	+5.1%	Open the original filing on SEC.gov
Mar 2	Saint Frederick G.	President, Marketplaces	PBUY★	20,000	$45.33	$906.6K	+7.7%	Open the original filing on SEC.gov
Mar 2	Glaser Rachel C	Director	PBUY★	1,000	$44.94	$44.9K	+31.7%	Open the original filing on SEC.gov
Mar 1	Simuro Frank	Chief Technology Officer	FTAX	18,702	$44.63	$834.7K	-4.2%	Open the original filing on SEC.gov
Mar 1	Desmarais Michael J	Chief Human Resources…	FTAX	6,353	$44.63	$283.5K	-8.0%	Open the original filing on SEC.gov
Mar 1	Ruggles Lisa	Senior VP, Global…	FTAX	8,931	$44.63	$398.6K	-4.8%	Open the original filing on SEC.gov
Mar 1	Lown Christian M.	Chief Financial Officer	FTAX	7,175	$44.63	$320.2K	-5.5%	Open the original filing on SEC.gov
Mar 1	Saint Frederick G.	President, Marketplaces	FTAX	11,096	$44.63	$495.2K	-4.1%	Open the original filing on SEC.gov
Mar 1	Cann Cynthia Cammett	Chief Accounting Officer	FTAX	1,385	$44.63	$61.8K	-5.9%	Open the original filing on SEC.gov
Mar 1	Florance Andrew C	President and CEO	FTAX	59,593	$44.63	$2.7M	-3.8%	Open the original filing on SEC.gov
Mar 1	Boxer Gene	General Counsel and…	FTAX	4,547	$44.63	$202.9K	-5.8%	Open the original filing on SEC.gov
Feb 27	Florance Andrew C	President and CEO	PBUY★	55,720	$44.52	$2.5M	+3.6%	Open the original filing on SEC.gov
Feb 27	Simuro Frank	Chief Technology Officer	AGRANT◆	52,869	—	—	—	Open the original filing on SEC.gov
Feb 27	Desmarais Michael J	Chief Human Resources…	AGRANT◆	17,926	—	—	—	Open the original filing on SEC.gov
Feb 27	Ruggles Lisa	Senior VP, Global…	AGRANT◆	28,197	—	—	—	Open the original filing on SEC.gov
Feb 27	Lown Christian M.	Chief Financial Officer	AGRANT◆	39,652	—	—	—	Open the original filing on SEC.gov
Feb 27	Saint Frederick G.	President, Marketplaces	AGRANT◆	39,652	—	—	—	Open the original filing on SEC.gov
Feb 27	Cann Cynthia Cammett	Chief Accounting Officer	AGRANT◆	6,834	—	—	—	Open the original filing on SEC.gov
Feb 27	Florance Andrew C	President and CEO	AGRANT◆	83,708	—	—	—	Open the original filing on SEC.gov
Feb 27	Boxer Gene	General Counsel and…	AGRANT◆	26,888	—	—	—	Open the original filing on SEC.gov
Feb 19	Simuro Frank	Chief Technology Officer	FTAX	4,421	$49.07	$216.9K	-1.0%	Open the original filing on SEC.gov
Feb 19	Simuro Frank	Chief Technology Officer	DTOISS	30,727	—	—	-6.4%	Open the original filing on SEC.gov
Feb 19	Ruggles Lisa	Senior VP, Global…	FTAX	3,219	$49.07	$158K	-1.7%	Open the original filing on SEC.gov
Feb 19	Ruggles Lisa	Senior VP, Global…	DTOISS	17,583	—	—	-8.5%	Open the original filing on SEC.gov
Feb 19	Saint Frederick G.	President, Marketplaces	FTAX	2,149	$49.07	$105.5K	-0.8%	Open the original filing on SEC.gov
Feb 19	Saint Frederick G.	President, Marketplaces	DTOISS	17,583	—	—	-6.0%	Open the original filing on SEC.gov
Feb 19	Florance Andrew C	President and CEO	FTAX	19,221	$49.07	$943.2K	-1.2%	Open the original filing on SEC.gov
Feb 19	Florance Andrew C	President and CEO	DTOISS	104,983	—	—	-6.3%	Open the original filing on SEC.gov
Feb 15	Simuro Frank	Chief Technology Officer	FTAX	4,151	$44.99	$186.8K	-0.9%	Open the original filing on SEC.gov
Feb 15	Ruggles Lisa	Senior VP, Global…	FTAX	3,576	$44.99	$160.9K	-1.7%	Open the original filing on SEC.gov
Feb 15	Saint Frederick G.	President, Marketplaces	FTAX	2,424	$44.99	$109.1K	-0.8%	Open the original filing on SEC.gov
Feb 15	Florance Andrew C	President and CEO	FTAX	17,482	$44.99	$786.5K	-1.1%	Open the original filing on SEC.gov
Nov 13, 2025	Hill John W	Director	SSELL	2,250	$68.68	$154.5K	-11.0%	Open the original filing on SEC.gov
Nov 13, 2025	Cann Cynthia Cammett	Chief Accounting Officer	SSELL	1,841	$68.79	$126.6K	-7.3%	Open the original filing on SEC.gov
Sep 9, 2025	Sams Louise S	Director	AGRANT	3,291	—	—	+20.4%	Open the original filing on SEC.gov
Sep 9, 2025	Glaser Rachel C	Director	AGRANT	3,143	—	—	—	Open the original filing on SEC.gov
Sep 9, 2025	Musslewhite Robert W	Director	AGRANT	3,121	—	—	+20.6%	Open the original filing on SEC.gov
Sep 9, 2025	Hill John W	Director	AGRANT	3,177	—	—	+18.4%	Open the original filing on SEC.gov
Sep 9, 2025	McCarthy Christine M	Director	AGRANT	2,973	—	—	—	Open the original filing on SEC.gov
Sep 9, 2025	Brunner Angelique G.	Director	AGRANT	3,143	—	—	+44.8%	Open the original filing on SEC.gov
Sep 9, 2025	Berisford John L	Director	AGRANT	2,973	—	—	—	Open the original filing on SEC.gov
Aug 28, 2025	Saint Frederick G.	President, Marketplaces	SSELL	25,000	$90.33	$2.3M	-7.9%	Open the original filing on SEC.gov
Aug 1, 2025	Saint Frederick G.	President, Marketplaces	FTAX	1,436	$95.19	$136.7K	-0.4%	Open the original filing on SEC.gov
Aug 1, 2025	Cann Cynthia Cammett	Chief Accounting Officer	FTAX	719	$95.19	$68.4K	-2.8%	Open the original filing on SEC.gov
Jul 28, 2025	Saint Frederick G.	President, Marketplaces	SSELL	25,000	$93.23	$2.3M	-7.3%	Open the original filing on SEC.gov
Jul 28, 2025	Cann Cynthia Cammett	Chief Accounting Officer	SSELL	2,033	$92.85	$188.8K	-7.3%	Open the original filing on SEC.gov
Jul 1, 2025	Lown Christian M.	Chief Financial Officer	FTAX	4,666	$80.40	$375.1K	-3.5%	Open the original filing on SEC.gov
Jun 15, 2025	Cann Cynthia Cammett	Chief Accounting Officer	FTAX	461	$81.16	$37.4K	-1.6%	Open the original filing on SEC.gov
Jun 11, 2025	Saint Frederick G.	President, Marketplaces	SSELL	25,000	$81.10	$2M	-6.8%	Open the original filing on SEC.gov
Jun 1, 2025	Ruggles Lisa	Senior VP, Global…	FTAX	12	$73.56	$883	<0.1%	Open the original filing on SEC.gov

SSELL$147.4K

Cann Cynthia Cammett · Chief Accounting…Aug 7

4,788 sh @ $30.78 · -20.3% own

SSELL$105.7K

Hill John W · DirectorAug 5

3,500 sh @ $30.21 · -13.2% own

PBUY↓$2.5M

Florance Andrew C · Founder and CEOAug 4

83,300 sh @ $29.89 · +4.8% own

FTAX$41.3K

Saint Frederick G. · President, Marketp…Aug 1

1,436 sh @ $28.76 · -0.5% own

FTAX$31K

Cann Cynthia Cammett · Chief Accounting…Aug 1

1,077 sh @ $28.76 · -4.4% own

AGRANT◆—

Rossmann Robin Jack · Chief Financial…Jul 31

34,771 sh

AGRANT◆—

Cann Cynthia Cammett · Chief Accounting…Jul 31

26,078 sh

FTAX$164.3K

Lown Christian M. · Chief Financial…Jul 1

5,597 sh @ $29.36 · -4.1% own

AGRANT—

Sams Louise S · DirectorJun 23

8,262 sh · +40.5% own

AGRANT—

McCarthy Christine M · DirectorJun 23

8,262 sh · +248.6% own

AGRANT—

Glaser Rachel C · DirectorJun 23

8,262 sh · +198.8% own

AGRANT—

Musslewhite Robert W · DirectorJun 23

8,262 sh · +45.2% own

AGRANT—

Hill John W · DirectorJun 23

8,262 sh · +45.3% own

AGRANT—

Brunner Angelique G. · DirectorJun 23

8,262 sh · +81.3% own

AGRANT—

Berisford John L · DirectorJun 23

8,262 sh · +277.9% own

FTAX$14.8K

Cann Cynthia Cammett · Chief Accounting…Jun 15

461 sh @ $32.04 · -1.8% own

PBUY$111K

Florance Andrew C · President and CEOMay 1

3,100 sh @ $35.82 · +0.2% own

PBUY↓$2.4M

Florance Andrew C · President and CEOMay 1

68,330 sh @ $35.17 · +4.1% own

FTAX↺$21K

Boxer Gene · General Counsel…Mar 15

482 sh @ $43.63 · -0.5% own

FTAX$484.6K

Simuro Frank · Chief Technology…Mar 15

11,107 sh @ $43.63 · -2.6% own

FTAX$125.3K

Desmarais Michael J · Chief Human…Mar 15

2,873 sh @ $43.63 · -3.2% own

FTAX$129.9K

Ruggles Lisa · Senior VP, Global…Mar 15

2,977 sh @ $43.63 · -1.7% own

FTAX$52.1K

Cann Cynthia Cammett · Chief Accounting…Mar 15

1,194 sh @ $43.63 · -4.5% own

AGRANT—

Desmarais Michael J · Chief Human…Mar 10

17,676 sh · +24.2% own

AGRANT—

Lown Christian M. · Chief Financial…Mar 10

12,268 sh · +10.0% own

AGRANT—

Cann Cynthia Cammett · Chief Accounting…Mar 10

4,374 sh · +19.9% own

AGRANT—

Florance Andrew C · President and CEOMar 10

124,162 sh · +8.1% own

AGRANT—

Boxer Gene · General Counsel…Mar 10

21,920 sh · +29.6% own

PBUY★$48.4K

Sams Louise S · DirectorMar 6

1,000 sh @ $48.36 · +5.1% own

PBUY★$906.6K

Saint Frederick G. · President, Marketp…Mar 2

20,000 sh @ $45.33 · +7.7% own

PBUY★$44.9K

Glaser Rachel C · DirectorMar 2

1,000 sh @ $44.94 · +31.7% own

FTAX$834.7K

Simuro Frank · Chief Technology…Mar 1

18,702 sh @ $44.63 · -4.2% own

FTAX$283.5K

Desmarais Michael J · Chief Human…Mar 1

6,353 sh @ $44.63 · -8.0% own

FTAX$398.6K

Ruggles Lisa · Senior VP, Global…Mar 1

8,931 sh @ $44.63 · -4.8% own

FTAX$320.2K

Lown Christian M. · Chief Financial…Mar 1

7,175 sh @ $44.63 · -5.5% own

FTAX$495.2K

Saint Frederick G. · President, Marketp…Mar 1

11,096 sh @ $44.63 · -4.1% own

FTAX$61.8K

Cann Cynthia Cammett · Chief Accounting…Mar 1

1,385 sh @ $44.63 · -5.9% own

FTAX$2.7M

Florance Andrew C · President and CEOMar 1

59,593 sh @ $44.63 · -3.8% own

FTAX$202.9K

Boxer Gene · General Counsel…Mar 1

4,547 sh @ $44.63 · -5.8% own

PBUY★$2.5M

Florance Andrew C · President and CEOFeb 27

55,720 sh @ $44.52 · +3.6% own

AGRANT◆—

Simuro Frank · Chief Technology…Feb 27

52,869 sh

AGRANT◆—

Desmarais Michael J · Chief Human…Feb 27

17,926 sh

AGRANT◆—

Ruggles Lisa · Senior VP, Global…Feb 27

28,197 sh

AGRANT◆—

Lown Christian M. · Chief Financial…Feb 27

39,652 sh

AGRANT◆—

Saint Frederick G. · President, Marketp…Feb 27

39,652 sh

AGRANT◆—

Cann Cynthia Cammett · Chief Accounting…Feb 27

6,834 sh

AGRANT◆—

Florance Andrew C · President and CEOFeb 27

83,708 sh

AGRANT◆—

Boxer Gene · General Counsel…Feb 27

26,888 sh

FTAX$216.9K

Simuro Frank · Chief Technology…Feb 19

4,421 sh @ $49.07 · -1.0% own

DTOISS—

Simuro Frank · Chief Technology…Feb 19

30,727 sh · -6.4% own

FTAX$158K

Ruggles Lisa · Senior VP, Global…Feb 19

3,219 sh @ $49.07 · -1.7% own

DTOISS—

Ruggles Lisa · Senior VP, Global…Feb 19

17,583 sh · -8.5% own

FTAX$105.5K

Saint Frederick G. · President, Marketp…Feb 19

2,149 sh @ $49.07 · -0.8% own

DTOISS—

Saint Frederick G. · President, Marketp…Feb 19

17,583 sh · -6.0% own

FTAX$943.2K

Florance Andrew C · President and CEOFeb 19

19,221 sh @ $49.07 · -1.2% own

DTOISS—

Florance Andrew C · President and CEOFeb 19

104,983 sh · -6.3% own

FTAX$186.8K

Simuro Frank · Chief Technology…Feb 15

4,151 sh @ $44.99 · -0.9% own

FTAX$160.9K

Ruggles Lisa · Senior VP, Global…Feb 15

3,576 sh @ $44.99 · -1.7% own

FTAX$109.1K

Saint Frederick G. · President, Marketp…Feb 15

2,424 sh @ $44.99 · -0.8% own

FTAX$786.5K

Florance Andrew C · President and CEOFeb 15

17,482 sh @ $44.99 · -1.1% own

SSELL$154.5K

Hill John W · DirectorNov 13, 2025

2,250 sh @ $68.68 · -11.0% own

SSELL$126.6K

Cann Cynthia Cammett · Chief Accounting…Nov 13, 2025

1,841 sh @ $68.79 · -7.3% own

AGRANT—

Sams Louise S · DirectorSep 9, 2025

3,291 sh · +20.4% own

AGRANT—

Glaser Rachel C · DirectorSep 9, 2025

3,143 sh

AGRANT—

Musslewhite Robert W · DirectorSep 9, 2025

3,121 sh · +20.6% own

AGRANT—

Hill John W · DirectorSep 9, 2025

3,177 sh · +18.4% own

AGRANT—

McCarthy Christine M · DirectorSep 9, 2025

2,973 sh

AGRANT—

Brunner Angelique G. · DirectorSep 9, 2025

3,143 sh · +44.8% own

AGRANT—

Berisford John L · DirectorSep 9, 2025

2,973 sh

SSELL$2.3M

Saint Frederick G. · President, Marketp…Aug 28, 2025

25,000 sh @ $90.33 · -7.9% own

FTAX$136.7K

Saint Frederick G. · President, Marketp…Aug 1, 2025

1,436 sh @ $95.19 · -0.4% own

FTAX$68.4K

Cann Cynthia Cammett · Chief Accounting…Aug 1, 2025

719 sh @ $95.19 · -2.8% own

SSELL$2.3M

Saint Frederick G. · President, Marketp…Jul 28, 2025

25,000 sh @ $93.23 · -7.3% own

SSELL$188.8K

Cann Cynthia Cammett · Chief Accounting…Jul 28, 2025

2,033 sh @ $92.85 · -7.3% own

FTAX$375.1K

Lown Christian M. · Chief Financial…Jul 1, 2025

4,666 sh @ $80.40 · -3.5% own

FTAX$37.4K

Cann Cynthia Cammett · Chief Accounting…Jun 15, 2025

461 sh @ $81.16 · -1.6% own

SSELL$2M

Saint Frederick G. · President, Marketp…Jun 11, 2025

25,000 sh @ $81.10 · -6.8% own

FTAX$883

Ruggles Lisa · Senior VP, Global…Jun 1, 2025

12 sh @ $73.56 · <0.1% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

All 63 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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