Costar Group, Inc. 13F holders
Of the 44 funds followed here, 10 reported a position in Costar Group, Inc. in a 13F for the quarter ended 30 June 2026. The largest: Baillie Gifford, 13.2 million shares worth $372.5 million, 0.3% of its reported book. Sold out: Tiger Global Management.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| Baillie Gifford | 13,154,165 | $372.5 million | 0.3% | -456,757 | trimmed | 30 June 2026 | 13F |
| Geode Capital Management | 12,166,469 | $343.3 million | 0.0% | -282,183 | trimmed | 30 June 2026 | 13F |
| Akre Capital Management | 11,699,396 | $331.3 million | 6.5% | +1,351,123 | added | 30 June 2026 | 13F |
| Norges Bank | 5,949,912 | $168.5 million | 0.0% | held | 30 June 2026 | 13F | |
| Capital Research Global Investors | 4,193,733 | $118.8 million | 0.0% | -179,973 | trimmed | 30 June 2026 | 13F |
| FMR LLC | 2,474,902 | $70.1 million | 0.0% | -356,622 | trimmed | 30 June 2026 | 13F |
| Citadel Advisors | 1,237,898 | $35.1 million | 0.0% | -471,306 | trimmed | 30 June 2026 | 13F |
| Two Sigma Investments | 1,200,150 | $34.0 million | 0.0% | +787,546 | added | 30 June 2026 | 13F |
| Millennium Management | 870,595 | $24.7 million | 0.0% | +658,605 | added | 30 June 2026 | 13F |
| Point72 Asset Management | 151,316 | $4.3 million | 0.0% | +115,416 | added | 30 June 2026 | 13F |
| Tiger Global Management | 0 | $0 | 0.0% | -1,500,000 | exited | 30 June 2026 | 13F |
Value is what the fund reported. Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.
Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 14 August 2026 | 13G | Bamco Inc /Ny/ and 7 others | 21.6 million | 5.3% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 29 April 2026 | 13G | Vanguard Portfolio Management and 1 other | 38.3 million | 9.1% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 29 April 2026 | 13G | Vanguard Capital Management and 1 other | 31.6 million | 7.5% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 26 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder. Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short.
Fails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 31 August 2026 | 62,865 | $32.22 | SEC |
| 26 August 2026 | 5,560 | $32.81 | SEC |
| 19 August 2026 | 1 | $31.38 | SEC |
| 11 August 2026 | 4,200 | $31.48 | SEC |
| 3 August 2026 | 81 | $28.76 | SEC |
| 28 July 2026 | 400 | $29.17 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period. Largest in the window: 62,865 on 31 August 2026. A fail is an operational fact about settlement, not a position.
Source
Each fund's 13F-HR on EDGAR, linked per row; positions matched to CSGP by CUSIP from the SEC's own fails-to-deliver files; Schedule 13D and 13G from the company's own filing index, each read to confirm the company is the issuer named.
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