| $11M | ||
| $10M | ||
| $7M | ||
| $7M | ||
| $4M | ||
| $4M |
Buys | $8,484,600 | 6 | 60 |
Sells | $534,282 | 4 | 40 |
| FLORANCE ANDREW C | President and CEO | 3 | $7.48M | 0 | $0 | $7.48M |
| SAINT FREDERICK G. | President, Marketplaces | 1 | $906,600 | 0 | $0 | $906,600 |
| Sams Louise S | director | 1 | $48,360 | 0 | $0 | $48,360 |
| Glaser Rachel C | director | 1 | $44,940 | 0 | $0 | $44,940 |
| Hill John W | director | 0 | $0 | 2 | $260,265 | $-260,265 |
| Cann Cynthia Cammett | Chief Accounting Officer | 0 | $0 | 2 | $274,017 | $-274,017 |
CoStar Group, Inc. (CSGP) stands as a premier global provider of comprehensive information, sophisticated analytics, and dynamic online marketplace services. The company caters to professionals within the commercial real estate, hospitality, residential, and related industries, extending its reach across the United States, Canada, Europe, the Asia Pacific region, and Latin America. Its diverse suite of offerings encompasses powerful data platforms like CoStar Property, which meticulously catalogues an extensive inventory of various property …
Over the last 12 months, insiders at CoStar Group, Inc. have bought $8.48M and sold $534,282 worth of CoStar Group, Inc. stock.
On average, over the past 5 years, insiders at CoStar Group, Inc. have bought $4.79M and sold $17.95M worth of stock each year.
Highest buying activity among insiders over the last 12 months: FLORANCE ANDREW C (President and CEO) — $7.48M. SAINT FREDERICK G. (President, Marketplaces) — $906,600. Sams Louise S (director) — $48,360.
The last purchase of 83,300 shares for transaction amount of $2.49M was made by FLORANCE ANDREW C (Founder and CEO) on 2026‑08‑04.
| 2026-08-07 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 4,788 0.0012% | $30.78 | $147,375 | +2.91% | |
| 2026-08-05 | Sale | Hill John W | director | 3,500 0.0009% | $30.21 | $105,735 | +2.32% | |
| 2026-08-04 | FLORANCE ANDREW C | Founder and CEO | 83,300 0.0206% | $29.89 | $2.49M | +2.97% | ||
| 2026-05-01 | FLORANCE ANDREW C | President and CEO | 71,430 0.0177% | $35.20 | $2.51M | -12.21% | ||
| 2026-03-06 | Sams Louise S | director | 1,000 0.0002% | $48.36 | $48,360 | -33.84% | ||
| 2026-03-02 | SAINT FREDERICK G. | President, Marketplaces | 20,000 0.0048% | $45.33 | $906,600 | -29.00% | ||
| 2026-03-02 | Glaser Rachel C | director | 1,000 0.0002% | $44.94 | $44,940 | -29.00% | ||
| 2026-02-27 | FLORANCE ANDREW C | President and CEO | 55,720 0.0131% | $44.52 | $2.48M | -28.06% | ||
| 2025-11-13 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 1,841 0.0004% | $68.79 | $126,642 | -50.37% | |
| 2025-11-13 | Sale | Hill John W | director | 2,250 0.0005% | $68.68 | $154,530 | -50.37% | |
| 2025-08-28 | Sale | SAINT FREDERICK G. | President, Marketplaces | 25,000 0.0059% | $90.33 | $2.26M | -49.36% | |
| 2025-07-28 | Sale | SAINT FREDERICK G. | President, Marketplaces | 25,000 0.0059% | $93.23 | $2.33M | -34.13% | |
| 2025-07-28 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 2,033 0.0005% | $92.85 | $188,764 | -34.13% | |
| 2025-06-11 | Sale | SAINT FREDERICK G. | President, Marketplaces | 25,000 0.0059% | $81.10 | $2.03M | -17.80% | |
| 2025-03-10 | Sale | Cann Cynthia Cammett | Chief Accounting Officer | 1,749 0.0004% | $79.90 | $139,745 | -3.80% | |
| 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% |
| FLORANCE ANDREW C | Founder and CEO | 1806165 0.4489% | $56.57M | 4 | 43 | +5.06% |
| SAINT FREDERICK G. | President, Marketplaces | 279851 0.0696% | $8.76M | 1 | 6 | |
| Sams Louise S | director | 20409 0.0051% | $639,209.88 | 1 | 0 | |
| Glaser Rachel C | director | 4157 0.001% | $130,197.24 | 1 | 0 |
$11,114,501 | 8 | -20.81% | $1.69B | |
$400,335 | 5 | 3.01% | $94.41M | |
$103,732 | 2 | -93.41% | $166.24M | |
$319,387 | 2 | -11.53% | $9.08M | |
CoStar Group, Inc. (CSGP) | $1,099,966 | 1 | 5.06% | $12.6B |
| Increased Positions | 382 | +32.79% | 42M | +10.08% |
| Decreased Positions | 539 | -46.27% | 47M | -11.18% |
| New Positions | 100 | New | 8M | New |
| Sold Out Positions | 143 | Sold Out | 4M | Sold Out |
| Total Postitions | 1,008 | -13.48% | 416M | -1.11% |
| 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 |