Castle Biosciences Inc
CSTL- Exchange
- Nasdaq
- Industry
- Services-Medical Laboratories
- SEC CIK
- 0001447362
In the last 90 days, Castle Biosciences Inc insiders filed 0 open-market purchases and 20 sales; 176 institutions reported holding it in 13F filings for Q2 2026, worth $653.8M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Castle Biosciences Inc as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 186
- −7 vs. Q4 2025
- Shares held
- 27.6M
- +2.50M (+10.0%) vs. Q4 2025
- Total value
- $677.8M
- −$298.6M (−30.6%) vs. Q4 2025
- New holders
- 29
- 72 more added
- Sold out
- 36
- 61 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting CSTL on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 176 | $653.8M |
| Q1 2026 | 186 | $677.8M |
| Q4 2025 | 195 | $1.06B |
| Q3 2025 | 173 | $608.3M |
| Q2 2025 | 152 | $541.8M |
| Q1 2025 | 180 | $516.3M |
| Q4 2024 | 197 | $706.4M |
| Q3 2024 | 185 | $736.9M |
| Q2 2024 | 159 | $549.4M |
| Q1 2024 | 151 | $553.2M |
| Q4 2023 | 153 | $515.4M |
| Q3 2023 | 135 | $391.0M |
| Q2 2023 | 130 | $316.6M |
| Q1 2023 | 148 | $501.9M |
| Q4 2022 | 153 | $522.0M |
| Q3 2022 | 157 | $569.8M |
| Q2 2022 | 146 | $495.0M |
| Q1 2022 | 160 | $1.02B |
| Q4 2021 | 159 | $918.6M |
| Q3 2021 | 188 | $1.42B |
| Q2 2021 | 182 | $1.52B |
| Q1 2021 | 175 | $1.46B |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Castle Biosciences Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Quantbot Technologies LP | 22,060 | $541.6K | 0.02% | +22,013+46,836.2% | Added |
| Legal & General Group Plc | 23,184 | $569.2K | 0.00% | −6,551−22.0% | Reduced |
| Magnetar Financial LLC | 23,332 | $572.8K | 0.01% | +23,332 | New |
| Y-Intercept (Hong Kong) Ltd | 23,501 | $577.0K | 0.01% | +10,255+77.4% | Added |
| Truist Financial Corp | 23,781 | $583.8K | 0.00% | +153+0.6% | Added |
| Deutsche Bank AG | 24,164 | $593.2K | 0.00% | +1,780+8.0% | Added |
| STRS Ohio | 25,000 | $613.8K | 0.00% | +12,400+98.4% | Added |
| Fox Run Management, L.L.C. | 26,247 | $618.1K | 0.11% | +4,363+19.9% | Added |
| Harbor Capital Advisors, Inc. | 25,614 | $629.0K | 0.05% | +12,182+90.7% | Added |
| Barclays PLC | 26,810 | $658.2K | 0.00% | −45,339−62.8% | Reduced |
| Arrowstreet Capital, Limited Partnership | 27,142 | $666.3K | 0.00% | +20,113+286.1% | Added |
| California State Teachers Retirement System | 27,513 | $675.4K | 0.00% | −212−0.8% | Reduced |
| CI Private Wealth, LLC | 31,870 | $782.4K | 0.00% | +31,870 | New |
| ExodusPoint Capital Management, LP | 32,608 | $800.5K | 0.01% | +32,608 | New |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 34,387 | $844.2K | 0.00% | +5,030+17.1% | Added |
| Algert Global LLC | 34,778 | $853.8K | 0.01% | +15,800+83.3% | Added |
| SEI Investments Co | 35,046 | $860.4K | 0.00% | −4,681−11.8% | Reduced |
| Nomura Holdings Inc | 35,748 | $877.6K | 0.01% | +35,748 | New |
| KBC Group NV | 36,932 | $907.0K | 0.00% | +36,932 | New |
| Price T Rowe Associates Inc | 37,792 | $928.0K | 0.00% | +3,654+10.7% | Added |
| Rhumbline Advisers | 38,378 | $942.2K | 0.00% | −90−0.2% | Reduced |
| Alliancebernstein L.P. | 25,270 | $983.0K | 0.00% | 00.0% | Unchanged |
| Schonfeld Strategic Advisors LLC | 42,413 | $1.04M | 0.01% | +20,937+97.5% | Added |
| Jane Street Group, LLC | 42,562 | $1.04M | 0.00% | −126,084−74.8% | Reduced |
| Quantinno Capital Management LP | 45,476 | $1.12M | 0.00% | +36,144+387.3% | Added |
| Formula Growth Ltd | 46,000 | $1.13M | 0.51% | +46,000 | New |
| Man Group plc | 47,138 | $1.16M | 0.00% | +35,553+306.9% | Added |
| UBS Group AG | 49,163 | $1.21M | 0.00% | −92,710−65.3% | Reduced |
| FMR LLC | 50,412 | $1.24M | 0.00% | +8,126+19.2% | Added |
| Swiss National Bank | 57,300 | $1.41M | 0.00% | 00.0% | Unchanged |
| Invesco Ltd. | 61,012 | $1.50M | 0.00% | −74,449−55.0% | Reduced |
| Envestnet Asset Management Inc | 61,865 | $1.52M | 0.00% | −101−0.2% | Reduced |
| AQR Capital Management LLC | 64,880 | $1.59M | 0.00% | +999+1.6% | Added |
| UBS Asset Management Americas Inc | 64,964 | $1.59M | 0.00% | −4,664−6.7% | Reduced |
| SummitTX Capital, L.P. | 67,033 | $1.65M | 0.05% | +49,623+285.0% | Added |
| Bank of America Corp | 67,810 | $1.66M | 0.00% | −195,209−74.2% | Reduced |
| Mackenzie Financial Corp | 74,111 | $1.82M | 0.00% | +36,794+98.6% | Added |
| Brinker Capital Investments, LLC | 74,896 | $1.84M | 0.02% | +243+0.3% | Added |
| American Century Companies Inc | 79,107 | $1.94M | 0.00% | +1,339+1.7% | Added |
| JPMorgan Chase & Co | 88,771 | $2.09M | 0.00% | −1,261−1.4% | Reduced |
| Bank of New York Mellon Corp | 88,654 | $2.18M | 0.00% | +1,670+1.9% | Added |
| Franklin Resources Inc | 90,909 | $2.23M | 0.00% | +10,306+12.8% | Added |
| Citadel Advisors LLC | 120,977 | $2.97M | 0.00% | −245,379−67.0% | Reduced |
| BNP Paribas Arbitrage, SA | 122,156 | $3.00M | 0.00% | −27,855−18.6% | Reduced |
| Parkman Healthcare Partners LLC | 126,150 | $3.10M | 0.32% | −24,408−16.2% | Reduced |
| Trexquant Investment LP | 130,434 | $3.20M | 0.02% | +65,829+101.9% | Added |
| Empowered Funds, LLC | 132,184 | $3.25M | 0.02% | +10,264+8.4% | Added |
| Campbell & CO Investment Adviser LLC | 148,824 | $3.65M | 0.21% | +148,824 | New |
| Allspring Global Investments Holdings, LLC | 160,663 | $3.94M | 0.01% | +1,492+0.9% | Added |
| Vanguard Fiduciary Trust Co | 188,211 | $4.62M | 0.00% | +188,211 | New |
| D. E. Shaw & Co., Inc. | 211,966 | $5.20M | 0.00% | +52,257+32.7% | Added |
| Panagora Asset Management Inc | 222,353 | $5.46M | 0.02% | +176,358+383.4% | Added |
| Tudor Investment Corp Et Al | 222,982 | $5.47M | 0.03% | +55,804+33.4% | Added |
| New York State Common Retirement Fund | 233,046 | $5.72M | 0.01% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 241,880 | $5.94M | 0.00% | −655−0.3% | Reduced |
| SG Americas Securities, LLC | 244,886 | $6.01M | 0.01% | +223,624+1,051.8% | Added |
| Advisors Capital Management, LLC | 248,376 | $6.10M | 0.07% | −2,301−0.9% | Reduced |
| Two Sigma Investments, LP | 248,840 | $6.11M | 0.01% | +164,774+196.0% | Added |
| Bridgeway Capital Management, LLC | 255,184 | $6.26M | 0.13% | +8,264+3.3% | Added |
| Kornitzer Capital Management Inc | 264,396 | $6.49M | 0.14% | −3,337−1.2% | Reduced |
| Silvercrest Asset Management Group LLC | 268,535 | $6.59M | 0.05% | +63,533+31.0% | Added |
| Northern Trust Corp | 273,101 | $6.70M | 0.00% | +10,858+4.1% | Added |
| Schroder Investment Management Group | 298,941 | $7.04M | 0.01% | −193,220−39.3% | Reduced |
| Goldman Sachs Group Inc | 341,171 | $8.38M | 0.00% | +53,936+18.8% | Added |
| Millennium Management LLC | 353,319 | $8.67M | 0.01% | +44,405+14.4% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 377,082 | $9.26M | 0.02% | −11,409−2.9% | Reduced |
| Eventide Asset Management, LLC | 386,425 | $9.49M | 0.16% | +81,425+26.7% | Added |
| Morgan Stanley | 428,934 | $10.5M | 0.00% | +225,357+110.7% | Added |
| Wasatch Advisors Inc | 455,036 | $11.2M | 0.07% | −82,205−15.3% | Reduced |
| Acadian Asset Management LLC | 484,441 | $11.9M | 0.02% | +94,035+24.1% | Added |
| Nuveen, LLC | 522,127 | $12.8M | 0.00% | −2,554−0.5% | Reduced |
| Renaissance Technologies LLC | 532,800 | $13.1M | 0.02% | +39,700+8.1% | Added |
| Palisade Capital Management LLC | 535,884 | $13.2M | 0.44% | −31,893−5.6% | Reduced |
| Qube Research & Technologies Ltd | 559,583 | $13.7M | 0.02% | +324,065+137.6% | Added |
| AIGH Capital Management LLC | 590,601 | $14.5M | 2.97% | −34,118−5.5% | Reduced |
| Geode Capital Management, LLC | 728,100 | $17.9M | 0.00% | +13,187+1.8% | Added |
| State Street Corp | 769,079 | $18.9M | 0.00% | +32,625+4.4% | Added |
| Allianz Asset Management GmbH | 811,324 | $19.9M | 0.02% | +189,025+30.4% | Added |
| Vanguard Portfolio Management LLC | 861,771 | $21.2M | 0.00% | +861,771 | New |
| Summit Partners Public Asset Management, LLC | 940,685 | $23.1M | 1.07% | −118,040−11.1% | Reduced |
| Dimensional Fund Advisors LP | 1,039,761 | $25.5M | 0.01% | −104,038−9.1% | Reduced |
| Vanguard Capital Management LLC | 1,177,522 | $28.9M | 0.00% | +1,177,522 | New |
| Portolan Capital Management, LLC | 1,350,283 | $33.1M | 1.76% | −379,180−21.9% | Reduced |
| Principal Financial Group Inc | 1,769,877 | $43.5M | 0.02% | −37,767−2.1% | Reduced |
| RTW Investments, LP | 2,758,335 | $67.7M | 0.67% | +643,098+30.4% | Added |
| BlackRock, Inc. | 2,982,946 | $73.2M | 0.00% | −122,300−3.9% | Reduced |
| Wellington Management Group LLP | 0 | $0 | 0.00% | −218,560−100.0% | Sold out |
| Braidwell LP | 0 | $0 | 0.00% | −177,183−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −119,458−100.0% | Sold out |
| EAM Investors, LLC | 0 | $0 | 0.00% | −74,138−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −55,118−100.0% | Sold out |
| Ameriprise Financial Inc | 0 | $0 | 0.00% | −35,368−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −29,899−100.0% | Sold out |
| Caxton Associates LLP | 0 | $0 | 0.00% | −22,464−100.0% | Sold out |
| HSBC Holdings PLC | 0 | $0 | 0.00% | −19,486−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −17,116−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −16,811−100.0% | Sold out |
| Counterpoint Mutual Funds LLC | 0 | $0 | 0.00% | −12,952−100.0% | Sold out |
| Intech Investment Management LLC | 0 | $0 | 0.00% | −11,718−100.0% | Sold out |
| Stephens Inc | 0 | $0 | 0.00% | −11,122−100.0% | Sold out |