| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 8.2% | $47,017,281 | 2,338,005 | BlackRock, Inc. | 31 Mar 2025 | |||
| VANGUARD GROUP INC | 6.5% | $36,852,279 | 1,832,535 | The Vanguard Group | 31 Dec 2024 | |||
| Portolan Capital Management, LLC | 5.6% | $32,399,201 | 1,611,099 | Portolan Capital Management, LLC | 07 Apr 2025 | |||
| DIMENSIONAL FUND ADVISORS LP | 3.9% | -24% | $44,494,010 | -$12,848,347 | 1,143,799 | -22% | Dimensional Fund Advisors LP | 31 Dec 2025 |
| WASATCH ADVISORS LP | 3.5% | $20,078,930 | 998,455 | WASATCH ADVISORS LP | 31 Mar 2025 |
As of 31 Dec 2025, 134 institutional investors reported holding 18,057,099 shares of CASTLE BIOSCIENCES INC - Common Stock (CSTL). This represents 62% of the company’s total 29,328,179 outstanding shares.
The largest institutional shareholders of CASTLE BIOSCIENCES INC - Common Stock (CSTL) together control 55% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 11% | 3,105,246 | -2.7% | 0% | $120,794,069 |
| VANGUARD GROUP INC | 7.5% | 2,199,829 | +1.3% | 0% | $85,573,349 |
| PRINCIPAL FINANCIAL GROUP INC | 6.2% | 1,807,644 | +0.74% | 0.04% | $70,317,352 |
| DIMENSIONAL FUND ADVISORS LP | 3.9% | 1,143,799 | -22% | 0.01% | $44,494,673 |
| STATE STREET CORP | 2.5% | 736,454 | +1.7% | 0% | $28,648,061 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 714,913 | +2.3% | 0% | $27,814,871 |
| AIGH Capital Management LLC | 2.1% | 624,719 | -12% | 7.2% | $24,301,569 |
| Allianz Asset Management GmbH | 2.1% | 622,299 | -4% | 0.03% | $24,207,431 |
| WASATCH ADVISORS LP | 1.8% | 537,241 | -20% | 0.12% | $20,898,675 |
| Nuveen, LLC | 1.8% | 524,681 | -45% | 0.01% | $20,410,091 |
| RENAISSANCE TECHNOLOGIES LLC | 1.7% | 493,100 | -12% | 0.03% | $19,181,590 |
| SCHRODER INVESTMENT MANAGEMENT GROUP | 1.7% | 492,161 | -0.56% | 0.01% | $19,346,849 |
| ACADIAN ASSET MANAGEMENT LLC | 1.3% | 390,406 | -14% | 0.02% | $15,180,000 |
| Connor, Clark & Lunn Investment Management Ltd. | 1.3% | 388,491 | +16% | 0.04% | $15,112,300 |
| EVENTIDE ASSET MANAGEMENT, LLC | 1% | 305,000 | 0.19% | $11,864,500 | |
| GOLDMAN SACHS GROUP INC | 0.98% | 287,235 | -17% | 0% | $11,173,441 |
| KORNITZER CAPITAL MANAGEMENT INC /KS | 0.91% | 267,733 | -3.8% | 0.22% | $10,414,814 |
| Advisors Capital Management, LLC | 0.85% | 250,677 | -1.4% | 0.11% | $9,751,335 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.83% | 242,535 | +1.8% | 0% | $9,434,617 |
| NEW YORK STATE COMMON RETIREMENT FUND | 0.79% | 233,046 | +1.3% | 0.01% | $9,065,489 |
| MORGAN STANLEY | 0.69% | 203,577 | -24% | 0% | $7,919,150 |
| JANE STREET GROUP, LLC | 0.58% | 168,646 | +637% | 0.01% | $6,560,329 |
| Allspring Global Investments Holdings, LLC | 0.54% | 159,171 | +1.7% | 0.01% | $6,134,450 |
| BNP PARIBAS FINANCIAL MARKETS | 0.51% | 150,011 | 0% | 0% | $5,835,428 |
| UBS Group AG | 0.48% | 141,873 | -51% | 0% | $5,518,860 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 18,057,099 | $702,064,089 | -$24,914,500 | $38.90 | 134 |
| 2025 Q3 | 26,525,698 | $603,808,247 | +$704,746 | $22.77 | 170 |
| 2025 Q2 | 26,536,136 | $541,803,165 | +$16,367,707 | $20.42 | 151 |
| 2025 Q1 | 25,785,418 | $516,159,447 | -$22,608,207 | $20.02 | 180 |
| 2024 Q4 | 26,505,010 | $706,396,254 | +$8,987,296 | $26.65 | 197 |
| 2024 Q3 | 25,823,597 | $736,872,924 | +$15,687,154 | $28.52 | 185 |
| 2024 Q2 | 25,237,547 | $549,387,569 | +$5,246,303 | $21.77 | 158 |
| 2024 Q1 | 24,977,542 | $553,239,171 | +$24,692,740 | $22.15 | 148 |
| 2023 Q4 | 23,883,435 | $515,429,989 | +$17,867,692 | $21.58 | 150 |
| 2023 Q3 | 23,151,664 | $391,032,725 | +$7,780,165 | $16.89 | 133 |
| 2023 Q2 | 22,797,205 | $312,778,898 | -$3,698,099 | $13.72 | 128 |
| 2023 Q1 | 22,094,408 | $501,938,865 | +$5,568,015 | $22.72 | 148 |
| 2022 Q4 | 22,279,170 | $524,435,055 | +$5,715,957 | $23.54 | 152 |
| 2022 Q3 | 21,906,465 | $571,186,085 | -$14,799,148 | $26.08 | 152 |
| 2022 Q2 | 22,558,449 | $495,033,707 | -$115,268,932 | $21.95 | 141 |
| 2022 Q1 | 22,780,568 | $1,019,269,661 | +$62,738,499 | $44.86 | 153 |
| 2021 Q4 | 21,449,510 | $918,308,511 | -$59,908,643 | $42.87 | 153 |
| 2021 Q3 | 20,974,973 | $1,396,164,362 | +$40,585,506 | $66.50 | 182 |
| 2021 Q2 | 20,801,213 | $1,521,315,172 | -$4,483,937 | $73.33 | 176 |
| 2021 Q1 | 21,328,263 | $1,459,495,488 | +$90,506,347 | $68.46 | 173 |
| 2020 Q4 | 19,063,994 | $1,280,953,552 | +$376,683,100 | $67.15 | 160 |
| 2020 Q3 | 13,395,783 | $689,395,356 | +$88,062,594 | $51.45 | 144 |
| 2020 Q2 | 11,747,525 | $443,283,646 | +$169,050,988 | $37.69 | 125 |
| 2020 Q1 | 7,359,714 | $219,391,385 | +$66,312,670 | $29.81 | 88 |
| 2019 Q4 | 5,108,808 | $175,588,000 | +$15,879,309 | $34.37 | 66 |
| 2019 Q3 | 4,868,946 | $88,077,000 | +$69,427,000 | $18.09 | 56 |