| 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 30 Sep 2025, 170 institutional investors reported holding 26,525,689 shares of CASTLE BIOSCIENCES INC - Common Stock (CSTL). This represents 90% of the company’s total 29,328,179 outstanding shares.
The largest institutional shareholders of CASTLE BIOSCIENCES INC - Common Stock (CSTL) together control 71% 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% | 3,189,896 | +1.1% | 0% | $72,633,931 |
| VANGUARD GROUP INC | 7.4% | 2,172,318 | +0.11% | 0% | $49,463,681 |
| PRINCIPAL FINANCIAL GROUP INC | 6.1% | 1,794,355 | -0.26% | 0.02% | $40,857,463 |
| Portolan Capital Management, LLC | 5.2% | 1,515,111 | +1.7% | 1.9% | $34,499,077 |
| DIMENSIONAL FUND ADVISORS LP | 5% | 1,474,089 | +7% | 0.01% | $33,564,113 |
| Nuveen, LLC | 3.3% | 957,081 | -11% | 0.01% | $21,792,735 |
| BRAIDWELL LP | 2.8% | 822,735 | 0% | 0.56% | $18,733,676 |
| STATE STREET CORP | 2.5% | 724,080 | +2.3% | 0% | $16,487,302 |
| AIGH Capital Management LLC | 2.4% | 707,287 | 5.6% | $16,104,925 | |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 698,610 | +1.3% | 0% | $15,909,607 |
| WASATCH ADVISORS LP | 2.3% | 669,120 | -36% | 0.08% | $15,235,862 |
| Allianz Asset Management GmbH | 2.2% | 648,351 | -9.2% | 0.02% | $14,762,953 |
| PALISADE CAPITAL MANAGEMENT, LP | 2.2% | 638,656 | +11% | 0.4% | $14,542,197 |
| MILLENNIUM MANAGEMENT LLC | 2% | 575,089 | +34% | 0.01% | $13,094,777 |
| RENAISSANCE TECHNOLOGIES LLC | 1.9% | 562,600 | -16% | 0.02% | $12,810,402 |
| SCHRODER INVESTMENT MANAGEMENT GROUP | 1.7% | 494,950 | -24% | 0.01% | $11,067,082 |
| Parkman Healthcare Partners LLC | 1.6% | 475,568 | +35% | 1.2% | $10,828,683 |
| ACADIAN ASSET MANAGEMENT LLC | 1.5% | 451,652 | -17% | 0.02% | $10,281,000 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 1.4% | 400,000 | 0.3% | $9,108,000 | |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | 1.3% | 367,888 | +31% | 0.06% | $8,376,810 |
| GOLDMAN SACHS GROUP INC | 1.2% | 345,099 | +26% | 0% | $7,857,904 |
| Point72 Asset Management, L.P. | 1.1% | 336,958 | 0.02% | $7,672,533 | |
| Connor, Clark & Lunn Investment Management Ltd. | 1.1% | 335,891 | +166% | 0.02% | $7,648,238 |
| BANK OF AMERICA CORP /DE/ | 1.1% | 315,370 | -18% | 0% | $7,180,975 |
| UBS Group AG | 0.99% | 291,362 | -20% | 0% | $6,634,313 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 227,453 | $8,791,024 | -$362,002 | $38.90 | 13 |
| 2025 Q3 | 26,525,689 | $603,808,452 | +$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 |