Who owns CASTLE BIOSCIENCES INC?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of CSTL from SEC Form 13F filings across 176 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 176 institutions disclosed 27.3M shares of CASTLE BIOSCIENCES INC worth $651.9M — about 89.9% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
176
13F holders
$651.9M
value, 2026 filers
89.9%
of shares outstanding (27.3M sh)
23
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of CSTL's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 3.3M | $78.5M | 0.0% | 10.8% | +10.4% |
| 2 | RTW INVESTMENTS, LP | 2.8M | $66.3M | 0.6% | 9.1% | +0.7% |
| 3 | PRINCIPAL FINANCIAL GROUP INC | 1.7M | $41.2M | 0.0% | 5.7% | -2.4% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.2M | $29.3M | 0.0% | 4% | +4.2% |
| 5 | ACADIAN ASSET MANAGEMENT LLC | 918,668 | $21.9M | 0.0% | 3% | +89.6% |
| 6 | Allianz Asset Management GmbH | 879,258 | $21.0M | 0.0% | 2.9% | +8.4% |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | 840,785 | $20.1M | 0.0% | 2.8% | -2.4% |
| 8 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 824,872 | $19.7M | 0.3% | 2.7% | -12.3% |
| 9 | STATE STREET CORP | 822,079 | $19.6M | 0.0% | 2.7% | +6.9% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 795,912 | $19.0M | 0.0% | 2.6% | +9.3% |
| 11 | MACKENZIE FINANCIAL CORP | 793,507 | $18.9M | 0.0% | 2.6% | +970.7% |
| 12 | DIMENSIONAL FUND ADVISORS LP | 791,085 | $18.9M | 0.0% | 2.6% | -23.9% |
| 13 | Jefferies Financial Group Inc.NEW | 647,391 | $15.4M | 0.1% | 2.1% | new |
| 14 | Qube Research & Technologies Ltd | 589,300 | $14.1M | 0.0% | 1.9% | +5.3% |
| 15 | AIGH Capital Management LLC | 545,101 | $13.0M | 0.8% | 1.8% | -7.7% |
| 16 | RENAISSANCE TECHNOLOGIES LLC | 371,200 | $8.9M | 0.0% | 1.2% | -30.3% |
| 17 | GOLDMAN SACHS GROUP INC | 358,397 | $8.5M | 0.0% | 1.2% | +5.0% |
| 18 | Point72 Asset Management, L.P.NEW | 357,317 | $8.5M | 0.0% | 1.2% | new |
| 19 | KENNEDY CAPITAL MANAGEMENT LLCNEW | 348,371 | $8.3M | 0.1% | 1.1% | new |
| 20 | Connor, Clark & Lunn Investment Management Ltd. | 331,727 | $7.9M | 0.0% | 1.1% | -12.0% |
| 21 | MORGAN STANLEY | 329,684 | $7.9M | 0.0% | 1.1% | -23.1% |
| 22 | Portolan Capital Management, LLC | 328,818 | $7.8M | 0.3% | 1.1% | -75.6% |
| 23 | PANAGORA ASSET MANAGEMENT INC | 301,040 | $7.2M | 0.0% | 1% | +35.4% |
| 24 | Allspring Global Investments Holdings, LLC | 292,470 | $7.0M | 0.0% | 1% | +82.0% |
| 25 | NORTHERN TRUST CORP | 285,158 | $6.8M | 0.0% | 0.9% | +4.4% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.