COSTAR GROUP, INC. (CSGP)

Latest Insider Confidence Score

2026Q1

42.9
Bearish

Company insider confidence (by quarter)

2010Q3 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Klein Michael R Director 1,848,592 Dec 12, 2024
Florance Andrew C CEO 1,672,832.03 Mar 7, 2025
Simuro Frank Chief Technology Officer 483,599 Mar 18, 2025
Bonderman David — 294,277 Sep 15, 2014
Saint Frederick G. President 293,103 Sep 2, 2025

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Mar 1, 2026 Mar 3, 2026 LOWN CHRISTIAN M. CFO Sell 20.0 -7,175 -5.51% ✗ $320.2K
Feb 27, 2026 Mar 3, 2026 SAINT FREDERICK G. President Neutral 52.5 - 0.00% ✗ -
Mar 1, 2026 Mar 3, 2026 FLORANCE ANDREW C CEO Sell 17.5 -59,593 -3.76% ✗ $2.7M
Mar 1, 2026 Mar 3, 2026 Boxer Gene General Counsel and Secretary Sell 22.5 -4,547 -5.79% ✗ $202.9K
Mar 1, 2026 Mar 3, 2026 DESMARAIS MICHAEL J Chief Human Resources Officer Sell 20.0 -6,353 -8.01% ✗ $283.5K
Mar 1, 2026 Mar 3, 2026 Cann Cynthia Cammett Chief Accounting Officer Sell 22.5 -1,385 -5.93% ✗ $61.8K
Mar 1, 2026 Mar 3, 2026 Ruggles Lisa Senior VP, Global Operations Sell 20.0 -8,931 -4.78% ✗ $398.6K
Mar 1, 2026 Mar 3, 2026 SIMURO FRANK Chief Technology Officer Sell 20.0 -18,702 -4.21% ✗ $834.7K
Mar 2, 2026 Mar 3, 2026 Glaser Rachel C Director Buy 91.3 +1,000 31.68% ✗ $44.9K
Mar 1, 2026 Mar 3, 2026 SAINT FREDERICK G. President Buy 90.0 +8,904 3.29% ✗ $411.4K
Feb 27, 2026 Mar 2, 2026 FLORANCE ANDREW C CEO Buy 92.5 +55,720 3.64% ✗ $2.5M
Feb 19, 2026 Feb 23, 2026 SIMURO FRANK Chief Technology Officer Sell 22.5 -35,148 -7.33% ✗ $216.9K
Feb 19, 2026 Feb 23, 2026 SAINT FREDERICK G. President Sell 22.5 -19,732 -6.79% ✗ $105.5K
Feb 19, 2026 Feb 23, 2026 FLORANCE ANDREW C CEO Sell 20.0 -124,204 -7.50% ✗ $943.2K
Feb 19, 2026 Feb 23, 2026 Ruggles Lisa Senior VP, Global Operations Sell 22.5 -20,802 -10.02% ✗ $158K
Feb 15, 2026 Feb 18, 2026 SIMURO FRANK Chief Technology Officer Sell 32.5 -4,151 -0.86% ✗ $186.8K
Feb 15, 2026 Feb 18, 2026 FLORANCE ANDREW C CEO Sell 20.0 -17,482 -1.05% ✗ $786.5K
Feb 15, 2026 Feb 18, 2026 Ruggles Lisa Senior VP, Global Operations Sell 22.5 -3,576 -1.69% ✗ $160.9K
Feb 15, 2026 Feb 18, 2026 SAINT FREDERICK G. President Sell 32.5 -2,424 -0.83% ✗ $109.1K
Nov 13, 2025 Nov 17, 2025 Hill John W Director Sell 22.5 -2,250 -10.99% ✗ $154.5K
Nov 13, 2025 Nov 17, 2025 Cann Cynthia Cammett Chief Accounting Officer Sell 22.5 -1,841 -7.35% ✗ $126.6K
Sep 9, 2025 Sep 11, 2025 McCarthy Christine M Director Neutral 90.0 +2,973 100.00% ✗ -
Sep 9, 2025 Sep 11, 2025 Sams Louise S Director Neutral 90.0 +3,291 20.42% ✗ -
Sep 9, 2025 Sep 11, 2025 BERISFORD JOHN L Director Neutral 90.0 +2,973 100.00% ✗ -
Sep 9, 2025 Sep 11, 2025 Hill John W Director Neutral 90.0 +3,177 18.36% ✗ -
Sep 9, 2025 Sep 11, 2025 Musslewhite Robert W Director Neutral 90.0 +3,121 20.59% ✗ -
Sep 9, 2025 Sep 11, 2025 Glaser Rachel C Director Neutral 90.0 +3,143 100.00% ✗ -
Sep 9, 2025 Sep 11, 2025 Brunner Angelique G. Director Neutral 90.0 +3,143 44.75% ✗ -
Aug 28, 2025 Sep 2, 2025 SAINT FREDERICK G. President Sell 17.5 -25,000 -7.86% ✗ $2.3M
Aug 1, 2025 Aug 5, 2025 Cann Cynthia Cammett Chief Accounting Officer Sell 22.5 -719 -2.79% ✗ $68.4K
Aug 1, 2025 Aug 5, 2025 SAINT FREDERICK G. President Sell 40.0 -1,436 -0.45% ✗ $136.7K
Jul 28, 2025 Jul 29, 2025 SAINT FREDERICK G. President Sell 17.5 -25,000 -7.26% ✗ $2.3M
Jul 28, 2025 Jul 29, 2025 Cann Cynthia Cammett Chief Accounting Officer Sell 22.5 -2,033 -7.31% ✗ $188.8K
Jul 1, 2025 Jul 2, 2025 LOWN CHRISTIAN M. CFO Sell 20.0 -4,666 -3.46% ✗ $375.1K
Jun 15, 2025 Jun 17, 2025 Cann Cynthia Cammett Chief Accounting Officer Sell 26.3 -461 -1.63% ✗ $37.4K
Jun 11, 2025 Jun 12, 2025 SAINT FREDERICK G. President Sell 17.5 -25,000 -6.77% ✗ $2M
Jun 1, 2025 Jun 3, 2025 Ruggles Lisa Senior VP, Global Operations Sell 52.5 -12 -0.01% ✗ $882.7
Apr 14, 2025 BERISFORD JOHN L Director Neutral 52.5 - 0.00% ✗ -
Apr 14, 2025 Glaser Rachel C Director Neutral 52.5 - 0.00% ✗ -
Apr 14, 2025 McCarthy Christine M Director Neutral 52.5 - 0.00% ✗ -
Mar 15, 2025 Mar 18, 2025 Ruggles Lisa Senior VP, Global Operations Sell 32.5 -1,958 -0.92% ✗ $154.2K
Mar 15, 2025 Mar 18, 2025 Cann Cynthia Cammett Chief Accounting Officer Sell 22.5 -1,191 -4.04% ✗ $93.8K
Mar 15, 2025 Mar 18, 2025 Boxer Gene General Counsel and Secretary Sell 36.3 -481 -0.61% ✗ $37.9K
Mar 15, 2025 Mar 18, 2025 DESMARAIS MICHAEL J Chief Human Resources Officer Sell 20.0 -3,641 -4.40% ✗ $286.7K
Mar 15, 2025 Mar 18, 2025 SIMURO FRANK Chief Technology Officer Sell 20.0 -5,700 -1.16% ✗ $448.8K
Jul 31, 2024 Mar 14, 2025 Cann Cynthia Cammett Chief Accounting Officer Sell 20.0 -4,259 -4.84% ✗ $334.3K
Mar 5, 2025 Mar 7, 2025 Cann Cynthia Cammett Chief Accounting Officer Neutral 82.5 +1,498 4.65% ✗ -
Mar 5, 2025 Mar 7, 2025 Boxer Gene General Counsel and Secretary Neutral 90.0 +12,492 18.77% ✗ -
Mar 5, 2025 Mar 7, 2025 FLORANCE ANDREW C CEO Neutral 82.5 +76,232 4.77% ✗ -
Mar 5, 2025 Mar 7, 2025 DESMARAIS MICHAEL J Chief Human Resources Officer Neutral 90.0 +9,026 12.24% ✗ -
Mar 1, 2025 Mar 3, 2025 Ruggles Lisa Senior VP, Global Operations Sell 20.0 -7,410 -3.36% ✗ $565K
Feb 27, 2025 Mar 3, 2025 DESMARAIS MICHAEL J Chief Human Resources Officer Sell 97.5 +14,935 25.40% ✗ $296.8K
Mar 1, 2025 Mar 3, 2025 SAINT FREDERICK G. President Sell 20.0 -8,252 -2.18% ✗ $629.2K
Feb 27, 2025 Mar 3, 2025 Cann Cynthia Cammett Chief Accounting Officer Sell 95.0 +3,222 11.11% ✗ $62K
Feb 27, 2025 Mar 3, 2025 Boxer Gene General Counsel and Secretary Sell 97.5 +23,253 53.69% ✗ $277.9K
Mar 1, 2025 Mar 3, 2025 FLORANCE ANDREW C CEO Sell 17.5 -41,296 -2.52% ✗ $3.1M
Mar 1, 2025 Mar 3, 2025 SIMURO FRANK Chief Technology Officer Sell 20.0 -12,432 -2.48% ✗ $947.9K
Feb 20, 2025 Feb 24, 2025 LOWN CHRISTIAN M. CFO Neutral 90.0 +97,600 262.20% ✗ -
Feb 13, 2025 Feb 24, 2025 FLORANCE ANDREW C CEO Sell 100.0 +389,033 31.15% ✗ $2.5M
Feb 13, 2025 Feb 24, 2025 Ruggles Lisa Senior VP, Global Operations Sell 97.5 +51,507 30.46% ✗ $548.1K
Feb 13, 2025 Feb 24, 2025 SIMURO FRANK Chief Technology Officer Sell 97.5 +116,712 30.31% ✗ $547.8K
Feb 13, 2025 Feb 24, 2025 SAINT FREDERICK G. President Sell 97.5 +84,546 28.83% ✗ $483.7K
Feb 15, 2025 Feb 19, 2025 SIMURO FRANK Chief Technology Officer Sell 20.0 -5,485 -1.40% ✗ $406.2K
Feb 15, 2025 Feb 19, 2025 Ruggles Lisa Senior VP, Global Operations Sell 20.0 -3,531 -2.05% ✗ $261.5K
Feb 15, 2025 Feb 19, 2025 FLORANCE ANDREW C CEO Sell 17.5 -14,235 -1.13% ✗ $1.1M
Feb 15, 2025 Feb 19, 2025 SAINT FREDERICK G. President Sell 32.5 -2,349 -0.79% ✗ $174K
Dec 10, 2024 Dec 12, 2024 Hill John W Director Sell 22.5 -2,930 -14.48% ✗ $209.9K
Dec 10, 2024 Dec 12, 2024 KLEIN MICHAEL R Director Neutral 27.5 -64,909 -3.39% ✗ -
Nov 27, 2024 Dec 2, 2024 NASSETTA CHRISTOPHER J Director Sell 32.5 -1,681 -0.61% ✗ $135.1K
Nov 26, 2024 Nov 27, 2024 DESMARAIS MICHAEL J Chief Human Resources Officer Sell 20.0 -5,500 -8.55% ✗ $439.3K
Oct 25, 2024 Oct 28, 2024 KLEIN MICHAEL R Director Sell 16.3 -77,505 -3.89% ✗ $5.4M
Oct 25, 2024 Oct 28, 2024 FLORANCE ANDREW C CEO Buy 87.5 +14,731 1.18% ✗ $1.1M
Jul 17, 2024 Aug 5, 2024 KLEIN MICHAEL R Director Neutral 55.0 +3,781 0.19% ✗ -
Jul 17, 2024 Aug 5, 2024 Brunner Angelique G. Director Neutral 90.0 +3,491 98.84% ✗ -
Jul 17, 2024 Aug 5, 2024 Sams Louise S Director Neutral 90.0 +3,491 27.65% ✗ -
Jul 17, 2024 Aug 5, 2024 Musslewhite Robert W Director Neutral 90.0 +3,293 27.76% ✗ -
Jul 17, 2024 Aug 5, 2024 Kaplan Laura Cox Director Neutral 90.0 +3,452 24.00% ✗ -
Jul 17, 2024 Aug 5, 2024 Hill John W Director Neutral 90.0 +3,689 22.30% ✗ -
Aug 5, 2024 LOWN CHRISTIAN M. CFO Neutral 52.5 - 0.00% ✗ -
Jul 17, 2024 Aug 5, 2024 NASSETTA CHRISTOPHER J Director Neutral 77.5 +3,781 1.38% ✗ -
Jul 30, 2024 Aug 1, 2024 Hill John W Director Sell 22.5 -1,325 -7.41% ✗ $103.6K
Jul 26, 2024 Jul 30, 2024 Cann Cynthia Cammett Chief Accounting Officer Neutral 90.0 +9,553 49.14% ✗ -
Jul 26, 2024 Jul 30, 2024 SAINT FREDERICK G. President Neutral 82.5 +12,738 4.50% ✗ -
Jul 27, 2024 Jul 30, 2024 KLEIN MICHAEL R Director Neutral 37.5 -16,500 -0.82% ✗ -
Jul 18, 2024 Cann Cynthia Cammett Chief Accounting Officer Neutral 52.5 - 0.00% ✗ -
Jul 1, 2024 Jul 3, 2024 LOWN CHRISTIAN M. CFO Neutral 90.0 +33,839 100.00% ✗ -
Jul 3, 2024 LOWN CHRISTIAN M. CFO Neutral 52.5 - 0.00% ✗ -
Jun 1, 2024 Jun 4, 2024 Ruggles Lisa Senior VP, Global Operations Sell 52.5 -11 -0.01% ✗ $859.9
May 16, 2024 May 17, 2024 SAINT FREDERICK G. President Sell 32.5 -2,500 -0.88% ✗ $221.1K
May 9, 2024 May 10, 2024 Ruggles Lisa Senior VP, Global Operations Sell 17.5 -20,000 -10.38% ✗ $1.8M
May 7, 2024 May 9, 2024 NASSETTA CHRISTOPHER J Director Neutral 52.5 - 0.00% ✗ -
Apr 26, 2024 Apr 30, 2024 DESMARAIS MICHAEL J Chief Human Resources Officer Sell 20.0 -3,800 -5.60% ✗ $352.1K
Apr 26, 2024 Apr 30, 2024 Wheeler Scott T CFO Sell 15.0 -122,736 -28.42% ✗ $11.4M
Mar 15, 2024 Mar 19, 2024 DESMARAIS MICHAEL J Chief Human Resources Officer Sell 22.5 -2,267 -3.23% ✗ $199.2K
Mar 15, 2024 Mar 19, 2024 SIMURO FRANK Chief Technology Officer Sell 20.0 -5,128 -1.30% ✗ $450.6K
Mar 15, 2024 Mar 19, 2024 Wheeler Scott T CFO Sell 20.0 -8,444 -2.66% ✗ $742K
Mar 15, 2024 Mar 19, 2024 Ruggles Lisa Senior VP, Global Operations Sell 40.0 -666 -0.34% ✗ $58.5K
Mar 15, 2024 Mar 19, 2024 Boxer Gene General Counsel and Secretary Sell 36.3 -372 -0.85% ✗ $32.7K
Mar 12, 2024 Mar 14, 2024 Wheeler Scott T CFO Neutral 52.5 - 0.00% ✗ -
Mar 1, 2024 Mar 5, 2024 FLORANCE ANDREW C CEO Sell 17.5 -24,228 -1.90% ✗ $2.1M