Who owns Costar Group Inc (CSGP)?
340 US mutual funds and ETFs from 158 fund families reported a position in CSGP for the quarter ending 2026-06-30. Against their own report a quarter earlier, 91 raised shares, 36 opened a new position, 144 cut and 69 sold out.
Largest fund families
| Fund family | Funds | Share of fund-held shares |
|---|---|---|
| Vanguard Index Funds | 8 | 35.0% |
| Baron Select Funds | 2 | 14.3% |
| Ishares Trust | 16 | 11.3% |
| Janus Investment Fund | 1 | 4.7% |
| American Funds Fundamental Investors | 1 | 4.6% |
| Select Sector Spdr Trust | 1 | 2.9% |
Tracked managers holding CSGP
| Investor | Book weight |
|---|---|
| Chuck Akre · Akre Capital | 6.5% |
Source: SEC Form N-PORT, which funds file about 60 days after quarter end, and the latest 13F filings. Share counts, not trades: a change can reflect fund inflows or outflows rather than a decision about CSGP. A record of holdings, not a forecast and not investment advice. See all owner pages or the forecast board for the names our model ranks.
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