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Who owns Castle Biosciences (CSTL) stock

170 funds reported Castle Biosciences (CSTL) shares in their latest 13F filings, worth $726M in all. The largest holder is Vanguard Group ($85.6M). Last quarter 87 funds added to their stakes and 82 cut them.

Largest holders of CSTL (13F)Largest holders of CSTL (13F)Vanguard Group$85.6MBlackRock$78.5MRTW Investments, LP$66.3MPrincipal Financial Group$41.2MVanguard Capital Management LLC$29.3MAcadian Asset Management LLC$21.9MAllianz Asset Management GmbH$21.0MMackenzie Financial$20.2MVanguard Portfolio Management LLC$20.1MSummit Partners Public Asset Mana…$19.7M

Largest holders (13F)

FundSharesValueChangeQuarter
Vanguard Group2,199,829$85.6Mincrease2025-12-31
BlackRock3,291,963$78.5Mincrease2026-06-30
RTW Investments, LP2,778,335$66.3Mincrease2026-06-30
Principal Financial Group1,726,648$41.2Mdecrease2026-06-30
Vanguard Capital Management LLC1,226,497$29.3Mincrease2026-06-30
Acadian Asset Management LLC918,668$21.9Mincrease2026-06-30
Allianz Asset Management GmbH879,258$21.0Mincrease2026-06-30
Mackenzie Financial568,440$20.2Mdecrease2026-09-30
Vanguard Portfolio Management LLC840,785$20.1Mdecrease2026-06-30
Summit Partners Public Asset Management, LLC824,872$19.7Mdecrease2026-06-30
State Street822,079$19.6Mincrease2026-06-30
Geode Capital Management, LLC795,912$19.0Mincrease2026-06-30
Dimensional Fund Advisors LP791,085$18.9Mdecrease2026-06-30
Jefferies Financial Group647,391$15.4Mnew2026-06-30
Qube Research & Technologies589,300$14.1Mincrease2026-06-30

Castle Biosciences' latest quarter

Castle Biosciences, Q3 2026: revenue $103M (+24% year over year), operating margin -2.7%, net loss $4.1M, operating cash flow $19.7M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most CSTL stock?

By the latest 13F filings: Vanguard Group ($85.6M); BlackRock ($78.5M); RTW Investments, LP ($66.3M); Principal Financial Group ($41.2M); Vanguard Capital Management LLC ($29.3M).

What is the short interest in CSTL?

2,016,505 shares were sold short at the 2026-10-15 settlement, 0.84% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.