Costar Group, Inc.
CSGP- Exchange
- Nasdaq
- Industry
- Services-Business Services, NEC
- SEC CIK
- 0001057352
In the last 90 days, Costar Group, Inc. insiders filed 1 open-market purchase and 2 sales; 760 institutions reported holding it in 13F filings for Q2 2026, worth $12.3B in total; superinvestors Akre Capital Management and Weitz Investment Management hold it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Costar Group, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 1 filing
- 1 insider, $2.49M in total
- Open-market sells
- 2 filings
- 2 insiders, $253.1K in total
- Insiders trading
- 3
- Net value
- +$2.24M
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Costar Group, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Cann Cynthia Cammett | Chief Accounting Officer | 18,822 | Aug 10, 2026 | 7 |
| Hill John W | Director | 22,993 | Aug 10, 2026 | 3 |
| Florance Andrew C | Founder and CEO | 1,806,165 | Aug 5, 2026 | 7 |
| Rossmann Robin Jack | Chief Financial Officer | – | Aug 4, 2026 | 1 |
| Saint Frederick G. | President, Marketplaces | 278,415 | Aug 4, 2026 | 5 |
| Lown Christian M. | Chief Financial Officer | 129,653 | Jul 6, 2026 | 3 |
| McCarthy Christine M | Director | 11,585 | Jun 24, 2026 | 1 |
| Musslewhite Robert W | Director | 26,539 | Jun 24, 2026 | 1 |
| Berisford John L | Director | 11,235 | Jun 24, 2026 | 1 |
| Glaser Rachel C | Director | 12,419 | Jun 24, 2026 | 2 |
| Brunner Angelique G. | Director | 18,428 | Jun 24, 2026 | 1 |
| Sams Louise S | Director | 28,671 | Jun 24, 2026 | 2 |
| Ruggles Lisa | Senior VP, Global Operations | 174,915 | Mar 17, 2026 | 4 |
| Boxer Gene | General Counsel and Secretary | 95,463 | Mar 17, 2026 | 3 |
| Desmarais Michael J | Chief Human Resources Officer | 87,725 | Mar 17, 2026 | 3 |
| Simuro Frank | Chief Technology Officer | 414,491 | Mar 17, 2026 | 4 |
| Klein Michael R | Director | 1,848,592 | Dec 12, 2024 | 0 |
| Nassetta Christopher J | Director | 229,715 | Dec 2, 2024 | 0 |
| Kaplan Laura Cox | Director | 17,835 | Aug 5, 2024 | 0 |
| Wheeler Scott T | Chief Financial Officer | 303,417 | Apr 30, 2024 | 0 |
| Glosserman Michael J | Director | 101,465 | Nov 1, 2023 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 10, 2026 (view filing)4:06 PM ET | Aug 7 | 3 days | Cann Cynthia CammettChief Accounting Officer | SSaleCommon Stock, par value $0.01 per share | −4.79K | $30.78 | −$147.4K | −20.3%18.8K after | |
| Aug 10, 2026 (view filing)4:06 PM ET | Aug 5 | 5 daysLate | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −3.50K | $30.21 | −$105.7K | −13.2%23.0K after | |
| Aug 5, 2026 (view filing)9:27 AM ET | Aug 4 | 1 day | Florance Andrew CFounder and CEO | PPurchaseCommon Stock, par value $0.01 per share | +83.3K | $29.89 | +$2.49M | +4.8%1.81M after | |
| May 4, 2026 (view filing) | May 1 | 3 days | Florance Andrew CPresident and CEO | PPurchaseCommon Stock, par value $0.01 per share | +71.4K | $35.20 | +$2.51M | +4.3%1.72M after | 2 lots |
| Mar 9, 2026 (view filing) | Mar 6 | 3 days | Sams Louise SDirector | PPurchaseCommon Stock, par value $0.01 per share | +1.00K | $48.36 | +$48.4K | +5.2%20.4K after | |
| Mar 3, 2026 (view filing) | Mar 2 | 1 day | Saint Frederick G.President, Marketplaces | PPurchaseCommon Stock, par value $0.01 per share | +20.0K | $45.33 | +$906.6K | +7.7%279.9K after | |
| Mar 3, 2026 (view filing) | Mar 2 | 1 day | Glaser Rachel CDirector | PPurchaseCommon Stock, par value $0.01 per share | +1.00K | $44.94 | +$44.9K | +31.7%4.16K after | |
| Mar 2, 2026 (view filing) | Feb 27 | 3 days | Florance Andrew CPresident and CEO | PPurchaseCommon Stock, par value $0.01 per share | +55.7K | $44.52 | +$2.48M | +3.6%1.59M after | |
| Nov 17, 2025 (view filing) | Nov 13 | 4 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −2.25K | $68.68 | −$154.5K | −11.0%18.2K after | |
| Nov 17, 2025 (view filing) | Nov 13 | 4 days | Cann Cynthia CammettChief Accounting Officer | SSaleCommon Stock, par value $0.01 per share | −1.84K | $68.79 | −$126.6K | −7.3%23.2K after | |
| Sep 2, 2025 (view filing) | Aug 28 | 5 days | Saint Frederick G.President, Marketplaces | SSaleCommon Stock, par value $0.01 per share | −25.0K | $90.33 | −$2.26M | −7.9%293.1K after | |
| Jul 29, 2025 (view filing) | Jul 28 | 1 day | Saint Frederick G.President, Marketplaces | SSaleCommon Stock, par value $0.01 per share | −25.0K | $93.23 | −$2.33M | −7.3%319.5K after | |
| Jul 29, 2025 (view filing) | Jul 28 | 1 day | Cann Cynthia CammettChief Accounting Officer | SSaleCommon Stock, par value $0.01 per share | −2.03K | $92.85 | −$188.8K | −7.3%25.8K after | |
| Jun 12, 2025 (view filing) | Jun 11 | 1 day | Saint Frederick G.President, Marketplaces | SSaleCommon Stock, par value $0.01 per share | −25.0K | $81.10 | −$2.03M | −6.8%344.5K after | |
| Mar 14, 2025 (view filing) | Jul 31, 2024-Mar 10, 2025 | 226 daysLate | Cann Cynthia CammettChief Accounting Officer | SSaleCommon Stock, par value $0.01 per share | −4.26K | $78.48 | −$334.3K | −12.6%29.5K after | 3 lots |
| Dec 12, 2024 (view filing) | Dec 10 | 2 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −2.73K | $76.76 | −$209.9K | −13.5%17.5K after | |
| Dec 2, 2024 (view filing) | Nov 27 | 5 days | Nassetta Christopher JDirector | SSaleCommon Stock, par value $0.01 per share | −1.68K | $80.39 | −$135.1K | −0.7%229.7K after | |
| Nov 27, 2024 (view filing) | Nov 26 | 1 day | Desmarais Michael JChief Human Resources Officer | SSaleCommon Stock, par value $0.01 per share | −5.50K | $79.88 | −$439.3K | −8.6%58.8K after | |
| Oct 28, 2024 (view filing) | Oct 25 | 3 days | Klein Michael RDirector | SSaleCommon Stock, par value $0.01 per share | −71.6K | $74.69 | −$5.35M | −3.6%1.91M after | |
| Oct 28, 2024 (view filing) | Oct 25 | 3 days | Florance Andrew CPresident and CEO | PPurchaseCommon Stock, par value $0.01 per share | +14.7K | $74.67 | +$1.10M | +1.2%1.26M after | |
| Aug 1, 2024 (view filing) | Jul 30 | 2 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −1.32K | $78.16 | −$103.6K | −7.4%16.5K after | |
| May 17, 2024 (view filing) | May 16 | 1 day | Saint Frederick G.President, Marketplaces | SSaleCommon Stock, par value $0.01 per share | −2.50K | $88.43 | −$221.1K | −0.9%282.9K after | |
| May 10, 2024 (view filing) | May 9 | 1 day | Ruggles LisaSenior VP, Global Operations | SSaleCommon Stock, par value $0.01 per share | −20.0K | $91.15 | −$1.82M | −10.4%172.6K after | |
| Apr 30, 2024 (view filing) | Apr 26 | 4 days | Desmarais Michael JChief Human Resources Officer | SSaleCommon Stock, par value $0.01 per share | −3.80K | $92.67 | −$352.1K | −5.6%64.1K after | |
| Apr 30, 2024 (view filing) | Apr 26 | 4 days | Wheeler Scott TChief Financial Officer | SSaleCommon Stock, par value $0.01 per share | −122.7K | $92.61 | −$11.4M | −28.8%303.4K after | |
| Nov 29, 2023 (view filing) | Nov 28 | 1 day | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −3.02K | $84.07 | −$253.9K | −14.5%17.9K after | |
| Nov 9, 2023 (view filing) | Nov 8 | 1 day | Nassetta Christopher JDirector | SSaleCommon Stock, par value $0.01 per share | −1.50K | $77.86 | −$116.8K | −0.5%273.6K after | |
| Jun 30, 2023 (view filing) | Jun 28 | 2 days | Wheeler Scott TChief Financial Officer | SSaleCommon Stock, par value $0.01 per share | −21.5K | $89.30 | −$1.92M | −6.2%324.7K after | |
| Jun 30, 2023 (view filing) | Jun 30 | Same day | Ruggles LisaSenior VP, Global Research | SSaleCommon Stock, par value $0.01 per share | −30.5K | $91.42 | −$2.79M | −16.3%156.2K after | |
| Jun 28, 2023 (view filing) | Jun 27 | 1 day | Simuro FrankChief Technology Officer | SSaleCommon Stock, par value $0.01 per share | −92.3K | $89.65 | −$8.27M | −25.9%264.5K after | |
| Jun 28, 2023 (view filing) | Jun 26 | 2 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −1.50K | $86.57 | −$129.9K | −8.1%16.9K after | |
| Jun 14, 2023 (view filing) | Jun 12 | 2 days | Wheeler Scott TChief Financial Officer | SSaleCommon Stock, par value $0.01 per share | −24.7K | $80.68 | −$1.99M | −6.7%346.2K after | |
| Jun 9, 2023 (view filing) | Jun 7 | 2 days | Saint Frederick G.President, Marketplaces | SSaleCommon Stock, par value $0.01 per share | −30.0K | $80.24 | −$2.41M | −11.2%237.9K after | |
| May 2, 2023 (view filing) | Apr 28 | 4 days | Florance Andrew CPresident and CEO | SSaleCommon Stock, par value $0.01 per share | −360.5K | $76.77 | −$27.7M | −27.0%974.3K after | |
| Apr 4, 2023 (view filing) | Mar 31 | 4 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −2.30K | $68.50 | −$157.6K | −11.1%18.4K after | |
| Mar 9, 2023 (view filing) | Mar 8 | 1 day | Desmarais Michael JChief Human Resources Officer | SSaleCommon Stock, par value $0.01 per share | −5.60K | $70.36 | −$394.0K | −11.1%44.8K after | |
| Mar 3, 2023 (view filing) | Mar 1 | 2 days | Simuro FrankChief Technology Officer | SSaleCommon Stock, par value $0.01 per share | −35.2K | $70.09 | −$2.47M | −9.4%337.6K after | |
| Nov 4, 2022 (view filing) | Nov 3 | 1 day | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −3.65K | $78.92 | −$288.1K | −15.0%20.7K after | |
| Oct 31, 2022 (view filing) | Oct 28 | 3 days | Desmarais Michael JChief Human Resources Officer | SSaleCommon Stock, par value $0.01 per share | −1.30K | $82.81 | −$107.3K | −3.4%36.9K after | |
| Aug 11, 2022 (view filing) | Aug 10 | 1 day | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −1.40K | $74.49 | −$104.3K | −6.4%20.6K after | |
| Aug 9, 2022 (view filing) | Aug 5 | 4 days | Klein Michael RDirector | SSaleCommon Stock, par value $0.01 per share | −150.0K | $72.42 | −$10.9M | −6.7%2.07M after | |
| Aug 5, 2022 (view filing) | Aug 3 | 2 days | Desmarais Michael JChief Human Resources Officer | SSaleCommon Stock, par value $0.01 per share | −2.00K | $72.51 | −$145.0K | −4.8%39.6K after | |
| May 26, 2022 (view filing) | May 24 | 2 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −1.75K | $57.07 | −$99.9K | −7.4%22.0K after | |
| May 4, 2022 (view filing) | May 2 | 2 days | Desmarais Michael JChief Human Resources Officer | SSaleCommon Stock, par value $0.01 per share | −1.00K | $63.14 | −$63.1K | −2.3%41.6K after | |
| Mar 3, 2022 (view filing) | Mar 2 | 1 day | Ruggles LisaSenior VP, Global Research | SSaleCommon Stock, par value $0.01 per share | −21.6K | $59.88 | −$1.30M | −11.8%161.6K after | |
| Nov 15, 2021 (view filing) | Nov 11 | 4 days | Wheeler Scott TChief Financial Officer | SSaleCommon Stock, par value $0.01 per share | −85 | $81.72 | −$6.95K | −11.6%645 after | |
| Nov 12, 2021 (view filing) | Nov 10 | 2 days | Nassetta Christopher JDirector | SSaleCommon Stock, par value $0.01 per share | −2.12K | $83.21 | −$176.4K | −0.8%267.2K after | |
| Nov 8, 2021 (view filing) | Nov 5 | 3 days | Kaplan Laura CoxDirector | SSaleCommon Stock, par value $0.01 per share | −4.04K | $83.29 | −$336.5K | −36.1%7.14K after | |
| Nov 2, 2021 (view filing) | Oct 29 | 4 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −9.23K | $86.97 | −$803.2K | −27.9%23.9K after | |
| Aug 11, 2021 (view filing) | Aug 9 | 2 days | Hill John WDirector | SSaleCommon Stock, par value $0.01 per share | −6.16K | $85.77 | −$528.3K | −16.9%30.2K after |