| $17M | ||
| $8M | ||
| $8M | ||
| $6M | ||
| $6M | ||
| $5M |
Buys | $3,432,194 | 3 | 30 |
Sells | $7,226,182 | 7 | 70 |
| FLORANCE ANDREW C | President and CEO | 1 | $2.48M | 0 | $0 | $2.48M |
| SAINT FREDERICK G. | President, Marketplaces | 1 | $906,600 | 3 | $6.62M | $-5.71M |
| Glaser Rachel C | director | 1 | $44,940 | 0 | $0 | $44,940 |
| Hill John W | director | 0 | $0 | 1 | $154,530 | $-154,530 |
| Cann Cynthia Cammett | Chief Accounting Officer | 0 | $0 | 3 | $455,152 | $-455,152 |
CoStar Group, Inc. provides information, analytics, and online marketplace services to the commercial real estate, hospitality, residential, and related professionals industries in the United States, Canada, Europe, the Asia Pacific, and Latin America. It offers CoStar Property that provides inventory of office, industrial, retail, multifamily, hospitality, and student housing properties and land; CoStar COMPS, a robust database of comparable commercial real estate sales transactions; CoStar Market Analytics to view and report on aggregated market and submarket trends; and CoStar Tenant, an online business-to-business prospecting and analytical tool that provides tenant information. The company also provides Lease Comps and Analysis, a tool to capture, manage, and maintain lease data; CoStar Lease Analysis; Public Record, a searchable database of commercially-zoned parcels; CoStar Real Estate Manager, a real estate lease administration, portfolio management, and lease accounting compliance software solution; and CoStar Risk Analytics and CoStar Investment. In addition, it offers apartment marketing sites, such as ApartmentFinder.com, ForRent.com, ApartmentHomeLiving.com, WestsideRentals.com, AFTER55.com, CorporateHousing.com, ForRentUniversity.com, Apartamentos.com, and Off Campus Partners; LoopNet Premium Lister; LoopNet Diamond, Platinum, and Gold Ads; LandsofAmerica.com, LandAndFarm.com, and LandWatch.com for rural land for-sale; BizBuySell.com, BizQuest.com, and FindaFranchise.com for operating businesses and franchises for-sale; Ten-X, an online auction platform for commercial real estate; and HomeSnap, an online and mobile software platform, as well as Homes.com, a homes for sale listings site. CoStar Group, Inc. was founded in 1987 and is headquartered in Washington, the District of Columbia.
Over the last 12 months, insiders at CoStar Group, Inc. have bought $3.43M and sold $7.23M worth of CoStar Group, Inc. stock.
On average, over the past 5 years, insiders at CoStar Group, Inc. have bought $2.27M and sold $24.09M worth of stock each year.
Highest buying activity among insiders over the last 12 months: FLORANCE ANDREW C (President and CEO) — $2.48M. SAINT FREDERICK G. (President, Marketplaces) — $906,600. Glaser Rachel C (director) — $44,940.
The last purchase of 1,000 shares for transaction amount of $44,940 was made by Glaser Rachel C (director) on 2026‑03‑02.
| 2026-03-02 | SAINT FREDERICK G. | President, Marketplaces | 20,000 0.0048% | $45.33 | $906,600 | +4.98% | ||
| 2026-03-02 | Glaser Rachel C | director | 1,000 0.0002% | $44.94 | $44,940 | +4.98% | ||
| 2026-02-27 | FLORANCE ANDREW C | President and CEO | 55,720 0.0131% | $44.52 | $2.48M | +4.84% | ||
| 2025-11-13 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 1,841 0.0004% | $68.79 | $126,642 | -5.40% | |
| 2025-11-13 | Sale | Hill John W | director | 2,250 0.0005% | $68.68 | $154,530 | -5.40% | |
| 2025-08-28 | Sale | SAINT FREDERICK G. | President, Marketplaces | 25,000 0.0059% | $90.33 | $2.26M | -24.92% | |
| 2025-07-28 | Sale | SAINT FREDERICK G. | President, Marketplaces | 25,000 0.0059% | $93.23 | $2.33M | -26.45% | |
| 2025-07-28 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 2,033 0.0005% | $92.85 | $188,764 | -26.45% | |
| 2025-06-11 | Sale | SAINT FREDERICK G. | President, Marketplaces | 25,000 0.0059% | $81.10 | $2.03M | -8.07% | |
| 2025-03-10 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 1,749 0.0004% | $79.90 | $139,745 | -3.70% | |
| 2024-12-10 | Sale | Hill John W | director | 2,735 0.0007% | $76.76 | $209,939 | +1.65% | |
| 2024-11-27 | Sale | NASSETTA CHRISTOPHER J | director | 1,681 0.0004% | $80.39 | $135,136 | -4.70% | |
| 2024-11-26 | Sale | DESMARAIS MICHAEL J | Chief Human Resources Officer | 5,500 0.0013% | $79.88 | $439,340 | -2.21% | |
| 2024-11-11 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 1,310 0.0003% | $76.85 | $100,674 | +3.12% | |
| 2024-10-25 | Sale | KLEIN MICHAEL R | director | 71,633 0.017% | $74.69 | $5.35M | +5.06% | |
| 2024-10-25 | FLORANCE ANDREW C | President and CEO | 14,731.03 0.0035% | $74.67 | $1.1M | +5.06% | ||
| 2024-07-31 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 1,200 0.0003% | $78.20 | $93,840 | -1.48% | |
| 2024-07-30 | Sale | Hill John W | director | 1,325 0.0003% | $78.16 | $103,562 | -2.06% | |
| 2024-05-16 | Sale | SAINT FREDERICK G. | President, Marketplaces | 2,500 0.0006% | $88.43 | $221,075 | -13.50% | |
| 2024-05-09 | Sale | Ruggles Lisa | Senior VP, Global Operations | 20,000 0.0049% | $91.15 | $1.82M | -16.44% |
| FLORANCE ANDREW C | President and CEO | 1586866 0.3744% | $77.61M | 2 | 43 | +5.06% |
| SAINT FREDERICK G. | President, Marketplaces | 279851 0.066% | $13.69M | 1 | 6 | |
| Cann Cynthia Cammett | Chief Accounting Officer | 23211 0.0055% | $1.14M | 0 | 5 | |
| Hill John W | director | 18231 0.0043% | $891,678.21 | 0 | 16 | |
| Glaser Rachel C | director | 4157 0.001% | $203,318.87 | 1 | 0 | |
| KLEIN MICHAEL R | director | 1913501 0.4515% | $93.59M | 0 | 19 | |
| Wheeler Scott T | Chief Financial Officer | 303417 0.0716% | $14.84M | 0 | 12 | |
| SIMURO FRANK | Chief Technology Officer | 264483 0.0624% | $12.94M | 0 | 2 | |
| NASSETTA CHRISTOPHER J | director | 229715 0.0542% | $11.24M | 0 | 11 | |
| Ruggles Lisa | Senior VP, Global Operations | 172616 0.0407% | $8.44M | 0 | 5 | |
| HABER WARREN H | director | 116733 0.0275% | $5.71M | 0 | 2 | |
| DESMARAIS MICHAEL J | Chief Human Resources Officer | 58798 0.0139% | $2.88M | 0 | 6 | |
| Radecki Brian J | Chief Financial Officer | 41473 0.0098% | $2.03M | 0 | 14 | |
| Marples Paul | Managing Director, CoStar UK | 28632 0.0068% | $1.4M | 0 | 10 | |
| SCHAFFEL DAVID M | Chief Information Officer | 25327 0.006% | $1.24M | 0 | 1 | |
| Kitchen Jennifer | Sr. Vice President, Research | 22220 0.0052% | $1.09M | 0 | 6 | |
| CARCHEDI FRANCIS | Executive VP, Corp. Dev. | 21329 0.005% | $1.04M | 0 | 21 | |
| Linnington Matthew | Executive VP, Sales | 19766 0.0047% | $966,755.06 | 0 | 8 | |
| Stanfill John L | Sr. VP-Sales, Customer Service | 15334 0.0036% | $749,985.94 | 0 | 9 | |
| Glosserman Michael J | director | 7232 0.0017% | $353,717.12 | 0 | 1 | |
| Kaplan Laura Cox | director | 7139 0.0017% | $349,168.49 | 0 | 3 | |
| Steinberg David Jay | director | 6456 0.0015% | $315,762.96 | 0 | 2 | |
| FARRINGTON CRAIG | Vice President, Research | 3800 0.0009% | $185,858.00 | 0 | 4 |
$5,986,165 | 5 | -18.81% | $3.97B | |
$400,335 | 5 | 3.01% | $109.65M | |
$103,732 | 2 | -93.42% | $42.28M | |
$1,000,000 | 1 | 7.56% | $3.66M | |
CoStar Group, Inc. (CSGP) | $1,099,966 | 1 | 5.06% | $20.73B |
| Increased Positions | 378 | +32.34% | 42M | +9.98% |
| Decreased Positions | 541 | -46.28% | 47M | -11.19% |
| New Positions | 97 | New | 8M | New |
| Sold Out Positions | 144 | Sold Out | 4M | Sold Out |
| Total Postitions | 1,006 | -13.94% | 415M | -1.21% |
| Vanguard Group Inc | $4.6M | 16.52% | 70.06M | +1M | +1.76% | 2025-09-30 |
| Blackrock, Inc. | $2.37M | 8.52% | 36.13M | +1M | +3.12% | 2025-09-30 |
| Bamco Inc /Ny/ | $1.26M | 4.54% | 19.26M | -424,369 | -2.16% | 2025-09-30 |
| Principal Financial Group Inc | $1.22M | 4.39% | 18.62M | -23,279 | -0.13% | 2025-09-30 |
| State Street Corp | $1.2M | 4.31% | 18.28M | +551,160 | +3.11% | 2025-09-30 |
| Geode Capital Management, Llc | $827,790.00 | 2.97% | 12.6M | +243,615 | +1.97% | 2025-09-30 |
| Akre Capital Management Llc | $611,343.00 | 2.2% | 9.31M | -2,747 | -0.03% | 2025-09-30 |
| Morgan Stanley | $561,191.00 | 2.02% | 8.54M | +1M | +15.27% | 2025-09-30 |
| Baillie Gifford & Co | $541,393.00 | 1.94% | 8.24M | -298,727 | -3.5% | 2025-09-30 |
| Massachusetts Financial Services Co /Ma/ | $486,552.00 | 1.75% | 7.41M | +821,111 | +12.47% | 2025-09-30 |