Who owns CSGP?
Institutional ownership of CoStar Group Inc. from Form 13F, Q2 2026
757 institutional managers reported holding CoStar Group Inc. (CSGP) in Form 13F filings for Q2 2026, with 413,924,382 shares worth $11.7B. The largest reported holder was Vanguard Portfolio Management LLC. Managers that filed both quarters added a net 6,797,597 shares (+1.7%). 108 opened new positions and 140 sold out.
- Funds holding
- 757
- Value held
- $11.7B
- New / sold out
- 108 / 140
- Net shares, same filers
- +1.7%
Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
Largest holders of CSGP
| Fund | Value | Share of 13F holdings | Shares | Move |
|---|---|---|---|---|
| Vanguard Portfolio Management LLC | $1.1B | 9.2% | 37,914,844 | Trimmed |
| BlackRock, Inc. | $958M | 8.2% | 33,813,969 | Unchanged |
| Vanguard Capital Management LLC | $756M | 6.4% | 26,683,792 | Trimmed |
| Bamco Inc | $612M | 5.2% | 21,626,763 | Added |
| State Street Corp | $521M | 4.4% | 18,410,876 | Trimmed |
| Capital International Investors | $471M | 4.0% | 16,643,016 | Added |
| Baillie Gifford & Co | $373M | 3.2% | 13,154,165 | Trimmed |
| Geode Capital Management, LLC | $343M | 2.9% | 12,166,469 | Trimmed |
| Akre Capital Management LLC | $331M | 2.8% | 11,699,396 | Added |
| Polen Capital Management LLC | $248M | 2.1% | 8,759,314 | Trimmed |
| AQR Capital Management LLC | $239M | 2.0% | 8,445,474 | Added |
| Jupiter Topco LLC | $222M | 1.9% | 7,832,860 | First report |
| Invesco Ltd. | $193M | 1.6% | 6,808,377 | Trimmed |
| EdgePoint Investment Group Inc. | $169M | 1.4% | 5,950,002 | New |
| Norges Bank | $169M | 1.4% | 5,949,912 | New |
| Morgan Stanley | $155M | 1.3% | 5,485,870 | Added |
| Meritage Group LP | $153M | 1.3% | 5,394,164 | Added |
| JPMorgan Chase & Co | $145M | 1.2% | 4,939,994 | Added |
| Goldman Sachs Group Inc | $145M | 1.2% | 5,129,484 | Trimmed |
| Federated Hermes, Inc. | $125M | 1.1% | 4,426,727 | Added |
| Capital Research Global Investors | $119M | 1.0% | 4,193,733 | Trimmed |
| Principal Financial Group Inc | $107M | 0.9% | 3,790,794 | Trimmed |
| Northern Trust Corp | $97.7M | 0.8% | 3,448,839 | Added |
| Qube Research & Technologies Ltd | $91.1M | 0.8% | 3,218,369 | New |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $88.9M | 0.8% | 3,136,727 | Added |
Share of 13F holdings is each fund's shares as a share of the 413,924,382 CSGP shares all 13F filers reported, not of shares outstanding.
Biggest buyers in Q2 2026
- AQR Capital Management LLC Added+$203M
- EdgePoint Investment Group Inc. New+$169M
- Norges Bank New+$169M
- Bamco Inc Added+$150M
- Qube Research & Technologies Ltd New+$91.1M
- JPMorgan Chase & Co Added+$90.9M
- Federated Hermes, Inc. Added+$88.6M
- Meritage Group LP Added+$58.5M
- Massachusetts Financial Services Co Added+$57.4M
- Spyglass Capital Management LLC Added+$44.8M
Biggest sellers in Q2 2026
- Principal Financial Group Inc Trimmed-$394M
- D. E. Shaw & Co., Inc. Trimmed-$138M
- Goldman Sachs Group Inc Trimmed-$117M
- Polen Capital Management LLC Trimmed-$108M
- Tiger Global Management LLC Sold out-$60.5M
- Greenhouse Funds LLLP Sold out-$55.6M
- Capitolis Liquid Global Markets LLC Sold out-$54.7M
- Mackenzie Financial Corp Trimmed-$42.0M
- Legal & General Group Plc Trimmed-$38.0M
- Tremblant Capital Group Trimmed-$36.2M
The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $2.0B and sold $1.9B; 297 added and 261 trimmed.
Schedule 13D and 13G filings on CSGP
Owners of more than 5% must file within days, so these can be newer than the 13F data.
- 2026-08-14BAMCO INC /NY/ SCHEDULE 13G filed by CoStar Group Inc.Schedule 13G
- 2026-04-29VANGUARD CAPITAL MANAGEMENT LLC SCHEDULE 13G filed by CoStar Group Inc.Schedule 13G
Questions about CSGP ownership
- Who owns CSGP stock?
- 757 institutional investment managers reported CSGP positions in their Form 13F filings for Q2 2026, holding 413,924,382 shares worth $11.7B in total. Vanguard Portfolio Management LLC reported the largest position.
- Are funds buying or selling CSGP?
- In Q2 2026, 108 managers opened new CSGP positions, 297 added, 261 trimmed and 140 sold out. Managers that filed in both quarters added a net 6,797,597 shares.
- How current is this CSGP institutional ownership data?
- It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to CSGP by CUSIP. Options are left out. CSGP news and filings · CSGP insider trades · Top funds