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 | $609.0M |
| Q2 2025 | 152 | $542.0M |
| Q1 2025 | 180 | $518.1M |
| Q4 2024 | 197 | $709.5M |
| Q3 2024 | 185 | $740.5M |
| Q2 2024 | 159 | $550.7M |
| Q1 2024 | 151 | $584.1M |
| Q4 2023 | 153 | $527.1M |
| Q3 2023 | 135 | $391.0M |
| Q2 2023 | 130 | $316.6M |
| Q1 2023 | 148 | $503.2M |
| Q4 2022 | 153 | $522.0M |
| Q3 2022 | 157 | $569.8M |
| Q2 2022 | 146 | $495.0M |
| Q1 2022 | 160 | $1.02B |
| Q4 2021 | 159 | $919.0M |
| Q3 2021 | 188 | $1.43B |
| 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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,291,963 | $78.5M | 0.00% | +309,017+10.4% | Added |
| RTW Investments, LP | 2,778,335 | $66.3M | 0.57% | +20,000+0.7% | Added |
| Principal Financial Group Inc | 1,726,648 | $41.2M | 0.02% | −43,229−2.4% | Reduced |
| Vanguard Capital Management LLC | 1,226,497 | $29.3M | 0.00% | +48,975+4.2% | Added |
| Acadian Asset Management LLC | 918,668 | $21.9M | 0.03% | +434,227+89.6% | Added |
| Allianz Asset Management GmbH | 879,258 | $21.0M | 0.02% | +67,934+8.4% | Added |
| Vanguard Portfolio Management LLC | 840,785 | $20.1M | 0.00% | −20,986−2.4% | Reduced |
| Summit Partners Public Asset Management, LLC | 824,872 | $19.7M | 0.51% | −115,813−12.3% | Reduced |
| State Street Corp | 822,079 | $19.6M | 0.00% | +53,000+6.9% | Added |
| Geode Capital Management, LLC | 795,912 | $19.0M | 0.00% | +67,812+9.3% | Added |
| Mackenzie Financial Corp | 793,507 | $18.9M | 0.02% | +719,396+970.7% | Added |
| Dimensional Fund Advisors LP | 791,085 | $18.9M | 0.00% | −248,676−23.9% | Reduced |
| Jefferies Financial Group Inc. | 647,391 | $15.4M | 0.14% | +647,391 | New |
| Qube Research & Technologies Ltd | 589,300 | $14.1M | 0.02% | +29,717+5.3% | Added |
| AIGH Capital Management LLC | 545,101 | $13.0M | 1.18% | −45,500−7.7% | Reduced |
| Renaissance Technologies LLC | 371,200 | $8.85M | 0.01% | −161,600−30.3% | Reduced |
| Goldman Sachs Group Inc | 358,397 | $8.55M | 0.00% | +17,226+5.0% | Added |
| Point72 Asset Management, L.P. | 357,317 | $8.52M | 0.01% | +357,317 | New |
| Kennedy Capital Management, Inc. | 348,371 | $8.31M | 0.15% | +348,371 | New |
| Connor, Clark & Lunn Investment Management Ltd. | 331,727 | $7.91M | 0.01% | −45,355−12.0% | Reduced |
| Morgan Stanley | 329,684 | $7.86M | 0.00% | −99,250−23.1% | Reduced |
| Portolan Capital Management, LLC | 328,818 | $7.84M | 0.29% | −1,021,465−75.6% | Reduced |
| Panagora Asset Management Inc | 301,040 | $7.18M | 0.02% | +78,687+35.4% | Added |
| Allspring Global Investments Holdings, LLC | 292,470 | $6.98M | 0.01% | +131,807+82.0% | Added |
| Northern Trust Corp | 285,158 | $6.80M | 0.00% | +12,057+4.4% | Added |
| Wasatch Advisors Inc | 279,349 | $6.66M | 0.04% | −175,687−38.6% | Reduced |
| Citadel Advisors LLC | 265,353 | $6.33M | 0.00% | +144,376+119.3% | Added |
| Kornitzer Capital Management Inc | 264,235 | $6.30M | 0.13% | −161−0.1% | Reduced |
| Silvercrest Asset Management Group LLC | 256,095 | $6.11M | 0.04% | −12,440−4.6% | Reduced |
| Charles Schwab Investment Management Inc | 254,535 | $6.07M | 0.00% | +12,655+5.2% | Added |
| Advisors Capital Management, LLC | 238,204 | $5.68M | 0.06% | −10,172−4.1% | Reduced |
| New York State Common Retirement Fund | 234,746 | $5.60M | 0.01% | +1,700+0.7% | Added |
| Palisade Capital Management LLC | 231,931 | $5.53M | 0.24% | −303,953−56.7% | Reduced |
| Nuveen, LLC | 231,726 | $5.53M | 0.00% | −290,401−55.6% | Reduced |
| Bridgeway Capital Management, LLC | 221,338 | $5.28M | 0.09% | −33,846−13.3% | Reduced |
| Trexquant Investment LP | 206,111 | $4.92M | 0.03% | +75,677+58.0% | Added |
| Millennium Management LLC | 205,369 | $4.90M | 0.00% | −147,950−41.9% | Reduced |
| Vanguard Fiduciary Trust Co | 197,494 | $4.71M | 0.00% | +9,283+4.9% | Added |
| AQR Capital Management LLC | 166,567 | $3.97M | 0.00% | +101,687+156.7% | Added |
| First Trust Advisors LP | 145,064 | $3.46M | 0.00% | +145,064 | New |
| Parkman Healthcare Partners LLC | 144,791 | $3.45M | 0.35% | +18,641+14.8% | Added |
| Empowered Funds, LLC | 142,338 | $3.39M | 0.02% | +10,154+7.7% | Added |
| HRT Financial LP | 115,853 | $2.76M | 0.01% | +99,995+630.6% | Added |
| D. E. Shaw & Co., Inc. | 112,789 | $2.69M | 0.00% | −99,177−46.8% | Reduced |
| Man Group plc | 108,761 | $2.59M | 0.00% | +61,623+130.7% | Added |
| Two Sigma Investments, LP | 100,374 | $2.39M | 0.00% | −148,466−59.7% | Reduced |
| Bank of America Corp | 98,745 | $2.36M | 0.00% | +30,935+45.6% | Added |
| Bank of New York Mellon Corp | 98,018 | $2.34M | 0.00% | +9,364+10.6% | Added |
| Franklin Resources Inc | 97,733 | $2.33M | 0.00% | +6,824+7.5% | Added |
| Arrowstreet Capital, Limited Partnership | 92,736 | $2.21M | 0.00% | +65,594+241.7% | Added |
| UBS Group AG | 89,368 | $2.13M | 0.00% | +40,205+81.8% | Added |
| JPMorgan Chase & Co | 84,804 | $2.06M | 0.00% | −3,967−4.5% | Reduced |
| SummitTX Capital, L.P. | 79,018 | $1.88M | 0.05% | +11,985+17.9% | Added |
| SEI Investments Co | 74,433 | $1.78M | 0.00% | +39,387+112.4% | Added |
| Algert Global LLC | 70,478 | $1.68M | 0.02% | +35,700+102.7% | Added |
| Brinker Capital Investments, LLC | 69,654 | $1.66M | 0.01% | −5,242−7.0% | Reduced |
| BNP Paribas Arbitrage, SA | 69,571 | $1.66M | 0.00% | −52,585−43.0% | Reduced |
| American Century Companies Inc | 65,413 | $1.56M | 0.00% | −13,694−17.3% | Reduced |
| UBS Asset Management Americas Inc | 64,346 | $1.53M | 0.00% | −618−1.0% | Reduced |
| Norges Bank | 60,100 | $1.43M | 0.00% | +60,100 | New |
| FMR LLC | 55,871 | $1.33M | 0.00% | +5,459+10.8% | Added |
| Envestnet Asset Management Inc | 55,157 | $1.32M | 0.00% | −6,708−10.8% | Reduced |
| Invesco Ltd. | 54,888 | $1.31M | 0.00% | −6,124−10.0% | Reduced |
| Swiss National Bank | 53,700 | $1.28M | 0.00% | −3,600−6.3% | Reduced |
| Price T Rowe Associates Inc | 53,242 | $1.27M | 0.00% | +15,450+40.9% | Added |
| Jane Street Group, LLC | 44,793 | $1.07M | 0.00% | +2,231+5.2% | Added |
| XTX Topco Ltd | 39,923 | $952.2K | 0.01% | +19,640+96.8% | Added |
| Rhumbline Advisers | 39,010 | $930.4K | 0.00% | +632+1.6% | Added |
| California State Teachers Retirement System | 37,802 | $901.6K | 0.00% | +10,289+37.4% | Added |
| KBC Group NV | 36,042 | $860.0K | 0.00% | −890−2.4% | Reduced |
| Russell Investments Group, Ltd. | 31,679 | $761.4K | 0.00% | +22,364+240.1% | Added |
| Y-Intercept (Hong Kong) Ltd | 31,916 | $761.2K | 0.02% | +8,415+35.8% | Added |
| Harbor Capital Advisors, Inc. | 31,748 | $757.0K | 0.05% | +6,134+23.9% | Added |
| STRS Ohio | 30,500 | $727.4K | 0.00% | +5,500+22.0% | Added |
| Barclays PLC | 30,330 | $723.4K | 0.00% | +3,520+13.1% | Added |
| Deutsche Bank AG | 30,139 | $718.8K | 0.00% | +5,975+24.7% | Added |
| Wells Fargo & Company | 29,543 | $704.6K | 0.00% | +16,651+129.2% | Added |
| Engineers Gate Manager LP | 29,480 | $703.1K | 0.01% | +11,224+61.5% | Added |
| CWM Advisors, LLC | 29,047 | $692.8K | 0.03% | +8,002+38.0% | Added |
| Alliancebernstein L.P. | 27,100 | $665.3K | 0.00% | +1,830+7.2% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 25,221 | $601.5K | 0.00% | −9,166−26.7% | Reduced |
| Truist Financial Corp | 23,786 | $567.3K | 0.00% | +50.0% | Added |
| Toroso Investments, LLC | 22,186 | $529.1K | 0.00% | +22,186 | New |
| Legal & General Group Plc | 20,548 | $490.1K | 0.00% | −2,636−11.4% | Reduced |
| Schonfeld Strategic Advisors LLC | 19,930 | $475.3K | 0.00% | −22,483−53.0% | Reduced |
| First Bank & Trust | 18,591 | $443.4K | 0.07% | +2,087+12.6% | Added |
| Vanguard Asset Management, Ltd | 17,653 | $421.0K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 17,008 | $405.6K | 0.00% | +286+1.7% | Added |
| Counterpoint Mutual Funds LLC | 16,510 | $393.8K | 0.04% | +16,510 | New |
| Campbell & CO Investment Adviser LLC | 16,476 | $393.0K | 0.02% | −132,348−88.9% | Reduced |
| Quantinno Capital Management LP | 16,428 | $391.8K | 0.00% | −29,048−63.9% | Reduced |
| Diversify Wealth Management, LLC | 15,932 | $389.4K | 0.01% | +172+1.1% | Added |
| Diversify Advisory Services, LLC | 15,932 | $389.4K | 0.01% | +15,932 | New |
| Citigroup Inc | 16,144 | $385.0K | 0.00% | +12,117+300.9% | Added |
| Perkins Capital Management Inc | 16,140 | $384.9K | 0.29% | +725+4.7% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 15,579 | $371.6K | 0.00% | +551+3.7% | Added |
| Jupiter Topco LLC | 15,037 | $358.2K | 0.00% | +15,037 | New |
| Tudor Investment Corp Et Al | 14,462 | $344.9K | 0.00% | −208,520−93.5% | Reduced |
| LPL Financial LLC | 14,220 | $339.1K | 0.00% | +4,520+46.6% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 13,785 | $328.8K | 0.00% | +109+0.8% | Added |