Research Open Terminal →

← Unusual insider activity · Company hub

CSGP CoStar Group Inc

Insider figures are trailing 90 days, open-market Form 4 only. Institutional figures are the latest reported quarter. These windows are not simultaneous.

$2.2M net buying - trailing 90 days

1 buyers - 2 unique sellers

Historical context: No open-market activity in Sep 2026 — insiders traded in 12 of the last 24 months

6 accumulating - 6 trimming - 1 unchanged

13 comparable institutions - Q2 2026

open-market Form 4 only - grants, exercises, tax withholding excluded. ~ derived from SEC-reported shares x price.

Insider net $ (monthly)open-market Form 4 only - grants, exercises, tax withholding excluded$5.0M$2.5M$0-$2.5M-$5.0M2024-10 -$4.3M2024-11 -$675K2024-12 -$210K2025-01 $02025-02 $02025-03 -$140K2025-04 $02025-05 $02025-06 -$2.0M2025-07 -$2.5M2025-08 -$2.3M2025-09 $02025-10 $02025-11 -$281K2025-12 $02026-01 $02026-02 $2.5M2026-03 $1000K2026-04 $02026-05 $2.5M2026-06 $02026-07 $02026-08 $2.2M2026-09 $0Institutional shares (majority-gated quarters)200.0M100.0M02025-Q4 139.0M sh2026-Q1 82.9M sh2026-Q2 83.2M shOct 24Dec 24Feb 25Apr 25Jun 25Aug 25Oct 25Dec 25Feb 26Apr 26Jun 26Aug 26Q4 2025Q1 2026Q2 2026~ derived from SEC-reported shares x price. Hatched: excluded (implausible price) or unpriced.

Who is responsible

Insider Role Net activity Rows
FLORANCE ANDREW C Founder and CEO ~$2.5M 1
Cann Cynthia Cammett Chief Accounting Officer -~$0.1M 1
Hill John W — -~$0.1M 1

Transactions

Date Insider Role Type Shares Price Value
August 7, 2026 Cann Cynthia Cammett Chief Accounting Officer S -4788 30.78 ~$0.1M
August 5, 2026 Hill John W — S -3500 30.21 ~$0.1M
August 4, 2026 FLORANCE ANDREW C Founder and CEO P 83300 29.89 ~$2.5M
May 1, 2026 FLORANCE ANDREW C President and CEO 2 reported purchase rows 71430 — ~$2.5M
March 6, 2026 Sams Louise S — P 1000 48.36 ~$48K
March 2, 2026 SAINT FREDERICK G. President, Marketplaces P 20000 45.33 ~$0.9M
March 2, 2026 Glaser Rachel C — P 1000 44.94 ~$45K
February 27, 2026 FLORANCE ANDREW C President and CEO P 55720 44.52 ~$2.5M
November 13, 2025 Cann Cynthia Cammett Chief Accounting Officer S -1841 68.79 ~$0.1M
November 13, 2025 Hill John W — S -2250 68.68 ~$0.2M
August 28, 2025 SAINT FREDERICK G. President, Marketplaces S -25000 90.33 ~$2.3M
July 28, 2025 Cann Cynthia Cammett Chief Accounting Officer S -2033 92.85 ~$0.2M
July 28, 2025 SAINT FREDERICK G. President, Marketplaces S -25000 93.23 ~$2.3M
June 11, 2025 SAINT FREDERICK G. President, Marketplaces S -25000 81.1 ~$2.0M
March 10, 2025 Cann Cynthia Cammett Chief Accounting Officer S -1749 79.9 ~$0.1M
December 10, 2024 Hill John W — S -2735 76.76 ~$0.2M
November 27, 2024 NASSETTA CHRISTOPHER J — S -1681 80.39 ~$0.1M
November 26, 2024 DESMARAIS MICHAEL J Chief Human Resources Officer S -5500 79.88 ~$0.4M
November 11, 2024 Cann Cynthia Cammett Chief Accounting Officer S -1310 76.85 ~$0.1M
October 25, 2024 FLORANCE ANDREW C President and CEO P 14731.03 74.67 ~$1.1M
October 25, 2024 KLEIN MICHAEL R — S -71633 74.69 ~$5.4M
July 31, 2024 Cann Cynthia Cammett Chief Accounting Officer S -1200 78.2 ~$94K