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Of the 10 tracked institutions holding CSTL, 4 have a 3-year clone track record — 4 of them beat the S&P. Average holder's clone alpha: +5.9pt. It's a gauge of who owns the name, not just how many.
Among the 10 tracked institutional investors we monitor, CSTL (CASTLE BIOSCIENCES INC) is held with a combined value of $206.74M across 7,135,366 shares. The largest holder is VANGUARD GROUP INC with a position worth $85.57M. Magnetar Financial LLC opened a new position in the most recent quarter. 7 funds increased their holdings. 2 funds reduced their position.
Total Institutional Value
$206.74M
Total Shares Held
7,135,366
Institutional Holders
10
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $85.57M | 0.00% | +1.3% |
| 2 | BlackRock, Inc. | $73.23M | 0.00% | -3.9% |
| 3 | STATE STREET CORP | $18.88M | 0.00% | +4.4% |
| 4 | RENAISSANCE TECHNOLOGIES LLC | $13.08M | 0.02% | +8.1% |
| 5 | MILLENNIUM MANAGEMENT LLC | $8.67M | 0.00% | +14.4% |
| 6 | CITADEL ADVISORS LLC | $2.97M | 0.00% | -67.0% |
| 7 | AQR CAPITAL MANAGEMENT LLC | $1.59M | 0.00% | +1.6% |
| 8 | FMR LLC | $1.24M | 0.00% | +19.2% |
| 9 | PRICE T ROWE ASSOCIATES INC /MD/ | $928.00K | 0.00% | +10.7% |
| 10 | Magnetar Financial LLC | $572.80K | 0.01% | New |
As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of CSTL with a position worth $85.57M, representing 0.00% of their portfolio. In total, 10 institutional investors hold CSTL with a combined value of $206.74M.
In the most recent quarter, 1 fund opened a new position in CSTL. Additionally, 7 increased their holdings and 2 reduced their positions.
Institutional investors hold $206.74M worth of CSTL stock across 10 positions. The largest institutional holder is VANGUARD GROUP INC with $85.57M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For CSTL, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their CSTL positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Last Close
$24.68
2026-07-24
YTD
-35.9%
35% of 52-week range
