Castle BiosciencesCSTL
13F holders, Q1 2026 (March 31)186holders −9
24new positions
34sold out
6famous investors
$24.55avg. 13F price*
At the end of Q1 2026, 186 institutions reported holding Castle Biosciences Inc. (CSTL) in their 13F filings, down 9 from Q4 2025. 24 opened new positions and 34 sold out. The largest holders were BlackRock, Inc. ($73.2M), RTW Investments, LP ($67.7M) and Principal Financial Group Inc. ($43.5M). 6 famous investors held it, including Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Castle Biosciences Inc.
- CUSIP
- 14843C105
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 24 | $10.3M |
| Exits | 34 | $34.1M |
All 13F filers, Q4 2025 → Q1 2026: 3,356,533 shares bought and 3,073,156 shares sold, net +283,377 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 186 holders
| BlackRock, Inc. | 0.00% | Reduce -3.9% | 2,982,946 | $73.2M |
| RTW Investments, LP | 0.67% | Add +30.4% | 2,758,335 | $67.7M |
| Principal Financial Group Inc. | 0.02% | Reduce -2.1% | 1,769,877 | $43.5M |
| Portolan Capital Management, LLC | 1.76% | Reduce -21.9% | 1,350,283 | $33.1M |
| Vanguard Capital Management LLC | 0.00% | — | 1,177,522 | $28.9M |
| Dimensional Fund Advisors LP | 0.01% | Reduce -9.1% | 1,039,761 | $25.5M |
| Summit Partners Public Asset Management, LLC | 1.07% | Reduce -11.2% | 940,685 | $23.1M |
| Vanguard Portfolio Management LLC | 0.00% | — | 861,771 | $21.2M |
| Allianz Asset Management GmbH | 0.02% | Add +30.4% | 811,324 | $19.9M |
| State Street Corp. | 0.00% | Add +4.4% | 769,079 | $18.9M |
| Geode Capital Management, LLC | 0.00% | Add +1.8% | 728,100 | $17.9M |
| AIGH Capital Management LLC | 2.97% | Reduce -5.5% | 590,601 | $14.5M |
| Qube Research & Technologies Ltd | 0.02% | Add +137.6% | 559,583 | $13.7M |
| Palisade Capital Management, LP | 0.47% | Reduce -5.6% | 535,884 | $13.2M |
| Renaissance Technologies | 0.02% | Add +8.1% | 532,800 | $13.1M |
| Nuveen, LLC | 0.00% | Reduce -0.5% | 522,127 | $12.8M |
| Acadian Asset Management LLC | 0.02% | Add +24.1% | 484,441 | $11.9M |
| Wasatch Advisors LP | 0.07% | Reduce -15.3% | 455,036 | $11.2M |
| Morgan Stanley | 0.00% | Add +110.7% | 428,934 | $10.5M |
| Eventide Asset Management, LLC | 0.16% | Add +26.7% | 386,425 | $9.5M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.02% | Reduce -2.9% | 377,082 | $9.3M |
| Millennium Management | 0.01% | Add +14.4% | 353,319 | $8.7M |
| Goldman Sachs Group Inc. | 0.00% | Add +18.8% | 341,171 | $8.4M |
| Schroder Investment Management Group | 0.01% | Reduce -39.3% | 298,941 | $7.0M |
| Northern Trust Corp. | 0.00% | Add +4.1% | 273,101 | $6.7M |
| Silvercrest Asset Management Group LLC | 0.05% | Add +31.0% | 268,535 | $6.6M |
| Kornitzer Capital Management Inc. | 0.14% | Reduce -1.3% | 264,396 | $6.5M |
| Bridgeway Capital Management, LLC | 0.13% | Add +3.4% | 255,184 | $6.3M |
| Two Sigma Investments, LP | 0.01% | Add +196.0% | 248,840 | $6.1M |
| Advisors Capital Management, LLC | 0.07% | Reduce -0.9% | 248,376 | $6.1M |
| SG Americas Securities, LLC | 0.01% | Add +1051.8% | 244,886 | $6.0M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -0.3% | 241,880 | $5.9M |
| New York State Common Retirement Fund | 0.01% | No change | 233,046 | $5.7M |
| Tudor Investment Corporation | 0.03% | Add +33.4% | 222,982 | $5.5M |
| Panagora Asset Management Inc. | 0.02% | Add +383.4% | 222,353 | $5.5M |
| D. E. Shaw & Co. | 0.00% | Add +32.7% | 211,966 | $5.2M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 188,211 | $4.6M |
| Allspring Global Investments Holdings, LLC | 0.01% | Add +0.9% | 160,663 | $3.9M |
| Campbell & CO Investment Adviser LLC | 0.21% | New | 148,824 | $3.7M |
| Empowered Funds, LLC | 0.02% | Add +8.4% | 132,184 | $3.2M |
| Trexquant Investment LP | 0.02% | Add +101.9% | 130,434 | $3.2M |
| Parkman Healthcare Partners LLC | 0.32% | Reduce -16.2% | 126,150 | $3.1M |
| BNP Paribas Financial Markets | 0.00% | Reduce -18.6% | 122,156 | $3.0M |
| Citadel Advisors | 0.00% | Reduce -67.0% | 120,977 | $3.0M |
| Franklin Resources Inc. | 0.00% | Add +12.8% | 90,909 | $2.2M |
| Bank of New York Mellon Corp | 0.00% | Add +1.9% | 88,654 | $2.2M |
| JPMorgan Chase & Co. | 0.00% | Reduce -1.4% | 88,771 | $2.1M |
| American Century Companies Inc. | 0.00% | Add +1.7% | 79,107 | $1.9M |
| Orion Porfolio Solutions, LLC | 0.02% | Add +0.3% | 74,896 | $1.8M |
| Mackenzie Financial Corp. | 0.00% | Add +98.6% | 74,111 | $1.8M |
| Bank of America Corp. | 0.00% | Reduce -74.2% | 67,810 | $1.7M |
| SummitTX Capital, L.P. | 0.05% | Add +285.0% | 67,033 | $1.6M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -6.7% | 64,964 | $1.6M |
| AQR Capital Management | 0.00% | Add +1.6% | 64,880 | $1.6M |
| Envestnet Asset Management Inc. | 0.00% | Reduce -0.2% | 61,865 | $1.5M |
| Invesco Ltd. | 0.00% | Reduce -55.0% | 61,012 | $1.5M |
| Swiss National Bank | 0.00% | No change | 57,300 | $1.4M |
| FMR LLC | 0.00% | Add +19.2% | 50,412 | $1.2M |
| UBS Group AG | 0.00% | Reduce -65.3% | 49,163 | $1.2M |
| Man Group plc | 0.00% | Add +306.9% | 47,138 | $1.2M |
| Formula Growth Ltd. | 0.51% | New | 46,000 | $1.1M |
| Quantinno Capital Management LP | 0.00% | Add +387.3% | 45,476 | $1.1M |
| Jane Street Group, LLC | 0.00% | Reduce -74.8% | 42,562 | $1.0M |
| Schonfeld Strategic Advisors LLC | 0.01% | Add +97.5% | 42,413 | $1.0M |
| Alliancebernstein L.P. | 0.00% | No change | 25,270 | $983K |
| Rhumbline Advisers | 0.00% | Reduce -0.2% | 38,378 | $942K |
| T. Rowe Price Associates Inc. | 0.00% | Add +10.7% | 37,792 | $928K |
| KBC Group NV | 0.00% | New | 36,932 | $907K |
| Nomura Holdings Inc. | 0.01% | New | 35,748 | $878K |
| Sei Investments Co. | 0.00% | Reduce -11.8% | 35,046 | $860K |
| Algert Global LLC | 0.01% | Add +83.3% | 34,778 | $854K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.00% | Add +17.1% | 34,387 | $844K |
| ExodusPoint Capital Management, LP | 0.01% | New | 32,608 | $801K |
| Corient Private Wealth LP | 0.00% | New | 31,870 | $782K |
| California State Teachers Retirement System | 0.00% | Reduce -0.8% | 27,513 | $675K |
| Arrowstreet Capital, Limited Partnership | 0.00% | Add +286.1% | 27,142 | $666K |
| Barclays PLC | 0.00% | Reduce -62.8% | 26,810 | $658K |
| Harbor Capital Advisors, Inc. | 0.05% | Add +90.7% | 25,614 | $629K |
| Fox Run Management, L.L.C. | 0.11% | Add +19.9% | 26,247 | $618K |
| STRS Ohio | 0.00% | Add +98.4% | 25,000 | $614K |
| Deutsche Bank AG | 0.00% | Add +8.0% | 24,164 | $593K |
| Truist Financial Corp. | 0.00% | Add +0.7% | 23,781 | $584K |
| Y-Intercept (Hong Kong) Ltd | 0.01% | Add +77.4% | 23,501 | $577K |
| Magnetar Financial LLC | 0.01% | New | 23,332 | $573K |
| Legal & General Group Plc | 0.00% | Reduce -22.0% | 23,184 | $569K |
| Quantbot Technologies LP | 0.02% | Add +46836.2% | 22,060 | $542K |
| Inspire Investing, LLC | 0.03% | Add +75.2% | 21,045 | $517K |
| XTX Topco Ltd | 0.01% | Reduce -8.3% | 20,283 | $498K |
| Brevan Howard Capital Management LP | 0.00% | New | 18,560 | $456K |
| Engineers Gate Manager LP | 0.01% | Reduce -20.4% | 18,256 | $448K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 17,653 | $433K |
| MetLife Investment Management, LLC | 0.00% | Add +5.3% | 16,722 | $411K |
| First Bank & Trust | 0.07% | Reduce -1.2% | 16,504 | $405K |
| Dynamic Technology Lab Private Ltd | 0.06% | New | 15,913 | $391K |
| HRT Financial LP | 0.00% | Reduce -66.7% | 15,858 | $389K |
| Diversify Wealth Management, LLC | 0.01% | Add +36.0% | 15,760 | $382K |
| Perkins Capital Management Inc. | 0.35% | Reduce -45.0% | 15,415 | $378K |
| Janus Henderson Group PLC | 0.00% | No change | 15,037 | $369K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 0.00% | Add +27.3% | 15,028 | $369K |
| Summit Global Investments | 0.02% | Add +10.9% | 13,718 | $337K |
"% of holder's portfolio" is CSTL's weight in each manager's 13F, not the share of Castle Biosciences Inc. the manager owns.