Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in CSGP held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | VANGUARD PORTFOLIO MANAGEMENT LLC | 37.9M | $1.07B | -0.8% | 9.357% | 0.05% |
| 2 | BlackRock, Inc. | 33.8M | $957.6M | +0.0% | 8.345% | 0.01% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 26.7M | $755.7M | -2.7% | 6.585% | 0.02% |
| 4 | BAMCO INC /NY/ | 21.6M | $612.5M | +32.6% | 5.337% | 0.92% |
| 5 | STATE STREET CORP | 18.4M | $521.4M | -1.3% | 4.544% | 0.01% |
| 6 | Capital International Investors | 16.6M | $471.3M | +7.3% | 4.107% | 0.10% |
| 7 | BAILLIE GIFFORD & CO | 13.2M | $372.5M | -3.4% | 3.246% | 0.34% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 12.2M | $343.3M | -2.3% | 3.003% | 0.02% |
| 9 | AKRE CAPITAL MANAGEMENT LLC | 11.7M | $331.3M | +13.1% | 2.887% | 6.47% |
| 10 | POLEN CAPITAL MANAGEMENT LLC | 8.8M | $248.1M | -30.3% | 2.162% | 2.14% |
| 11 | AQR CAPITAL MANAGEMENT LLC | 8.4M | $239.2M | +568.8% | 2.084% | 0.08% |
| 12 | Jupiter Topco LLC | 7.8M | $221.8M | β | 1.933% | 0.09% |
| 13 | Invesco Ltd. | 6.8M | $192.8M | -22.7% | 1.680% | 0.02% |
| 14 | EdgePoint Investment Group Inc. | 6.0M | $168.5M | β | 1.468% | 1.27% |
| 15 | NORGES BANK | 5.9M | $168.5M | β | 1.468% | 0.02% |
| 16 | MORGAN STANLEY | 5.5M | $155.4M | +1.4% | 1.354% | 0.01% |
| 17 | Meritage Group LP | 5.4M | $152.8M | +62.0% | 1.331% | 5.89% |
| 18 | JPMORGAN CHASE & CO | 4.9M | $145.4M | +167.1% | 1.219% | 0.01% |
| 19 | GOLDMAN SACHS GROUP INC | 5.1M | $145.3M | -44.6% | 1.266% | 0.01% |
| 20 | FEDERATED HERMES, INC. | 4.4M | $125.4M | +241.0% | 1.093% | 0.18% |
| 21 | Capital Research Global Investors | 4.2M | $118.8M | -4.1% | 1.035% | 0.02% |
| 22 | PRINCIPAL FINANCIAL GROUP INC | 3.8M | $107.4M | -78.6% | 0.935% | 0.05% |
| 23 | NORTHERN TRUST CORP | 3.4M | $97.7M | +0.5% | 0.851% | 0.01% |
| 24 | Qube Research & Technologies Ltd | 3.2M | $91.1M | β | 0.794% | 0.08% |
| 25 | BNP Paribas Asset Management Holding S.A. | 3.1M | $88.9M | +17.2% | 0.774% | 0.09% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in CSGP β a direct measure of their conviction.
Filings activity in CSGP during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 761 | 3.9% | 101.98% | +1.44 pp | $11.57B | 28% |
| Q1 2026 | 792 | 5.6% | 100.54% | 0.65 pp | $16.11B | 39% |
| Q4 2025 | 839 | 4.7% | 101.19% | 0.80 pp | $26.61B | 21% |
| Q3 2025 | 880 | +3.4% | 101.99% | 2.01 pp | $33.86B | +3.7% |
| Q2 2025 | 851 | +2.3% | 104.00% | 95.99 pp | $32.64B | 58% |
| Q1 2025 | 832 | +8.5% | 199.99% | +101.56 pp | $78.35B | +187% |
| Q4 2024 | 767 | +3.6% | 98.43% | +2.18 pp | $27.27B | 3.5% |
| Q3 2024 | 740 | β | 96.25% | β | $28.26B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as a key fundamental indicator because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| May 1, 2026 | FLORANCE ANDREW C | Buy | 68K | $35.17 | $2.4M |
Quick answers to the most common questions about buying CSGP stock.
Based on Q2 2026 13F filings, institutional ownership of CoStar Group, Inc. stands at 102.0%, held across 761 reporting institutions.
VANGUARD PORTFOLIO MANAGEMENT LLC is the largest reported institutional holder of CSGP, with approximately 37,914,844 shares worth $1.07B as of Q2 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of CSGP, including AKRE CAPITAL MANAGEMENT LLC.
Our composite Smart Money Score for CSGP is 49 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
102 institutions opened new positions in CSGP during Q2 2026, while 139 fully exited. 162 added to existing positions and 474 trimmed.
CSGP institutional ownership rose by 1.44 percentage points quarter-over-quarter, with a net change of -31 holders.
The top 10 institutions account for 49.2% of all reported 13F value in CSGP, and the top 25 account for 68.3%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
CoStar Group, Inc. (CSGP) Institutional Ownership