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, Q2 2026
Institutional positions in Castle Biosciences Inc as of Jun 30, 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
- 176
- −7 vs. Q1 2026
- Shares held
- 27.4M
- −182.5K (−0.7%) vs. Q1 2026
- Total value
- $653.8M
- −$23.5M (−3.5%) vs. Q1 2026
- New holders
- 23
- 80 more added
- Sold out
- 30
- 56 more reduced
3 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Castle Biosciences Inc; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Deutsche Bank AG | 30,139 | $718.8K | 0.00% | +5,975+24.7% | Added |
| Barclays PLC | 30,330 | $723.4K | 0.00% | +3,520+13.1% | Added |
| STRS Ohio | 30,500 | $727.4K | 0.00% | +5,500+22.0% | Added |
| Harbor Capital Advisors, Inc. | 31,748 | $757.0K | 0.05% | +6,134+23.9% | Added |
| Y-Intercept (Hong Kong) Ltd | 31,916 | $761.2K | 0.02% | +8,415+35.8% | Added |
| Russell Investments Group, Ltd. | 31,679 | $761.4K | 0.00% | +22,364+240.1% | Added |
| KBC Group NV | 36,042 | $860.0K | 0.00% | −890−2.4% | Reduced |
| California State Teachers Retirement System | 37,802 | $901.6K | 0.00% | +10,289+37.4% | Added |
| Rhumbline Advisers | 39,010 | $930.4K | 0.00% | +632+1.6% | Added |
| XTX Topco Ltd | 39,923 | $952.2K | 0.01% | +19,640+96.8% | Added |
| Jane Street Group, LLC | 44,793 | $1.07M | 0.00% | +2,231+5.2% | Added |
| Price T Rowe Associates Inc | 53,242 | $1.27M | 0.00% | +15,450+40.9% | Added |
| Swiss National Bank | 53,700 | $1.28M | 0.00% | −3,600−6.3% | Reduced |
| Invesco Ltd. | 54,888 | $1.31M | 0.00% | −6,124−10.0% | Reduced |
| Envestnet Asset Management Inc | 55,157 | $1.32M | 0.00% | −6,708−10.8% | Reduced |
| FMR LLC | 55,871 | $1.33M | 0.00% | +5,459+10.8% | Added |
| Norges Bank | 60,100 | $1.43M | 0.00% | +60,100 | New |
| UBS Asset Management Americas Inc | 64,346 | $1.53M | 0.00% | −618−1.0% | Reduced |
| American Century Companies Inc | 65,413 | $1.56M | 0.00% | −13,694−17.3% | Reduced |
| BNP Paribas Arbitrage, SA | 69,571 | $1.66M | 0.00% | −52,585−43.0% | Reduced |
| Brinker Capital Investments, LLC | 69,654 | $1.66M | 0.01% | −5,242−7.0% | Reduced |
| Algert Global LLC | 70,478 | $1.68M | 0.02% | +35,700+102.7% | Added |
| SEI Investments Co | 74,433 | $1.78M | 0.00% | +39,387+112.4% | Added |
| SummitTX Capital, L.P. | 79,018 | $1.88M | 0.05% | +11,985+17.9% | Added |
| JPMorgan Chase & Co | 84,804 | $2.06M | 0.00% | −3,967−4.5% | Reduced |
| UBS Group AG | 89,368 | $2.13M | 0.00% | +40,205+81.8% | Added |
| Arrowstreet Capital, Limited Partnership | 92,736 | $2.21M | 0.00% | +65,594+241.7% | Added |
| Franklin Resources Inc | 97,733 | $2.33M | 0.00% | +6,824+7.5% | Added |
| Bank of New York Mellon Corp | 98,018 | $2.34M | 0.00% | +9,364+10.6% | Added |
| Bank of America Corp | 98,745 | $2.36M | 0.00% | +30,935+45.6% | Added |
| Two Sigma Investments, LP | 100,374 | $2.39M | 0.00% | −148,466−59.7% | Reduced |
| Man Group plc | 108,761 | $2.59M | 0.00% | +61,623+130.7% | Added |
| D. E. Shaw & Co., Inc. | 112,789 | $2.69M | 0.00% | −99,177−46.8% | Reduced |
| HRT Financial LP | 115,853 | $2.76M | 0.01% | +99,995+630.6% | Added |
| Empowered Funds, LLC | 142,338 | $3.39M | 0.02% | +10,154+7.7% | Added |
| Parkman Healthcare Partners LLC | 144,791 | $3.45M | 0.35% | +18,641+14.8% | Added |
| First Trust Advisors LP | 145,064 | $3.46M | 0.00% | +145,064 | New |
| AQR Capital Management LLC | 166,567 | $3.97M | 0.00% | +101,687+156.7% | Added |
| Vanguard Fiduciary Trust Co | 197,494 | $4.71M | 0.00% | +9,283+4.9% | Added |
| Millennium Management LLC | 205,369 | $4.90M | 0.00% | −147,950−41.9% | Reduced |
| Trexquant Investment LP | 206,111 | $4.92M | 0.03% | +75,677+58.0% | Added |
| Bridgeway Capital Management, LLC | 221,338 | $5.28M | 0.09% | −33,846−13.3% | Reduced |
| Nuveen, LLC | 231,726 | $5.53M | 0.00% | −290,401−55.6% | Reduced |
| Palisade Capital Management LLC | 231,931 | $5.53M | 0.24% | −303,953−56.7% | Reduced |
| New York State Common Retirement Fund | 234,746 | $5.60M | 0.01% | +1,700+0.7% | Added |
| Advisors Capital Management, LLC | 238,204 | $5.68M | 0.06% | −10,172−4.1% | Reduced |
| Charles Schwab Investment Management Inc | 254,535 | $6.07M | 0.00% | +12,655+5.2% | Added |
| Silvercrest Asset Management Group LLC | 256,095 | $6.11M | 0.04% | −12,440−4.6% | Reduced |
| Kornitzer Capital Management Inc | 264,235 | $6.30M | 0.13% | −161−0.1% | Reduced |
| Citadel Advisors LLC | 265,353 | $6.33M | 0.00% | +144,376+119.3% | Added |
| Wasatch Advisors Inc | 279,349 | $6.66M | 0.04% | −175,687−38.6% | Reduced |
| Northern Trust Corp | 285,158 | $6.80M | 0.00% | +12,057+4.4% | Added |
| Allspring Global Investments Holdings, LLC | 292,470 | $6.98M | 0.01% | +131,807+82.0% | Added |
| Panagora Asset Management Inc | 301,040 | $7.18M | 0.02% | +78,687+35.4% | Added |
| Portolan Capital Management, LLC | 328,818 | $7.84M | 0.29% | −1,021,465−75.6% | Reduced |
| Morgan Stanley | 329,684 | $7.86M | 0.00% | −99,250−23.1% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 331,727 | $7.91M | 0.01% | −45,355−12.0% | Reduced |
| Kennedy Capital Management, Inc. | 348,371 | $8.31M | 0.15% | +348,371 | New |
| Point72 Asset Management, L.P. | 357,317 | $8.52M | 0.01% | +357,317 | New |
| Goldman Sachs Group Inc | 358,397 | $8.55M | 0.00% | +17,226+5.0% | Added |
| Renaissance Technologies LLC | 371,200 | $8.85M | 0.01% | −161,600−30.3% | Reduced |
| AIGH Capital Management LLC | 545,101 | $13.0M | 1.18% | −45,500−7.7% | Reduced |
| Qube Research & Technologies Ltd | 589,300 | $14.1M | 0.02% | +29,717+5.3% | Added |
| Jefferies Financial Group Inc. | 647,391 | $15.4M | 0.14% | +647,391 | New |
| Dimensional Fund Advisors LP | 791,085 | $18.9M | 0.00% | −248,676−23.9% | Reduced |
| Mackenzie Financial Corp | 793,507 | $18.9M | 0.02% | +719,396+970.7% | Added |
| Geode Capital Management, LLC | 795,912 | $19.0M | 0.00% | +67,812+9.3% | Added |
| State Street Corp | 822,079 | $19.6M | 0.00% | +53,000+6.9% | Added |
| Summit Partners Public Asset Management, LLC | 824,872 | $19.7M | 0.51% | −115,813−12.3% | Reduced |
| Vanguard Portfolio Management LLC | 840,785 | $20.1M | 0.00% | −20,986−2.4% | Reduced |
| Allianz Asset Management GmbH | 879,258 | $21.0M | 0.02% | +67,934+8.4% | Added |
| Acadian Asset Management LLC | 918,668 | $21.9M | 0.03% | +434,227+89.6% | Added |
| Vanguard Capital Management LLC | 1,226,497 | $29.3M | 0.00% | +48,975+4.2% | Added |
| Principal Financial Group Inc | 1,726,648 | $41.2M | 0.02% | −43,229−2.4% | Reduced |
| RTW Investments, LP | 2,778,335 | $66.3M | 0.57% | +20,000+0.7% | Added |
| BlackRock, Inc. | 3,291,963 | $78.5M | 0.00% | +309,017+10.4% | Added |
| Eventide Asset Management, LLC | 0 | $0 | 0.00% | −386,425−100.0% | Sold out |
| Schroder Investment Management Group | 0 | $0 | 0.00% | −298,941−100.0% | Sold out |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −244,886−100.0% | Sold out |
| Formula Growth Ltd | 0 | $0 | 0.00% | −46,000−100.0% | Sold out |
| Nomura Holdings Inc | 0 | $0 | 0.00% | −35,748−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −32,608−100.0% | Sold out |
| CI Private Wealth, LLC | 0 | $0 | 0.00% | −31,870−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −26,247−100.0% | Sold out |
| Magnetar Financial LLC | 0 | $0 | 0.00% | −23,332−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −18,560−100.0% | Sold out |
| Dynamic Technology Lab Private Ltd | 0 | $0 | 0.00% | −15,913−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −12,300−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −12,236−100.0% | Sold out |
| Canada Pension Plan Investment Board | 0 | $0 | 0.00% | −11,400−100.0% | Sold out |
| Jackson Creek Investment Advisors LLC | 0 | $0 | 0.00% | −11,214−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −11,133−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −9,520−100.0% | Sold out |
| Globeflex Capital L P | 0 | $0 | 0.00% | −3,759−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −336−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −292−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −287−100.0% | Sold out |
| Massmutual Trust Co FSB | 0 | $0 | 0.00% | −202−100.0% | Sold out |
| RWM Asset Management, LLC | 0 | $0 | 0.00% | −88−100.0% | Sold out |
| Signaturefd, LLC | 0 | $0 | 0.00% | −45−100.0% | Sold out |