Castle Biosciences (CSTL)
Provides clinician-facing molecular diagnostic tests across dermatology and gastroenterology.
$34.85
After hours+0.02 (+0.06%)
At close$34.83(−0.46%)
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13F · 13D/G · Form 4
| Institutions | 90.62% | 27.68M shares | |
|---|---|---|---|
| 180 holders · as of Jun 30, 2026 | |||
| Insiders | 5.49% | 1.68M shares | |
| 12 holders · as of Sep 16, 2026 | |||
| Other | 3.89% | 1.19M shares | |
| remainder | |||
30.55M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
13F, as of Jun 30, 2026
180 holders · 27.68M shares · 27 new positions · 107 increased · 56 reduced · 33 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 3.29M | 10.78% | +309.0K | Aug 7, 2026 |
| RTW Investments, LP | 2.78M | 9.09% | +20.0K | Aug 14, 2026 |
| Principal Financial Group Inc | 1.73M | 5.65% | −43.2K | Aug 4, 2026 |
| Vanguard Capital Management LLC | 1.23M | 4.01% | +49.0K | Aug 13, 2026 |
| Acadian Asset Management LLC | 918.7K | 3.01% | +434.2K | Aug 13, 2026 |
| Allianz Asset Management GmbH | 879.3K | 2.88% | +67.9K | Sep 2, 2026 |
| Vanguard Portfolio Management LLC | 840.8K | 2.75% | −21.0K | Aug 13, 2026 |
| Summit Partners Public Asset Management, LLC | 824.9K | 2.70% | −115.8K | Aug 14, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| RTW Investments, LP | 9.30% | 2.76M | 13G | May 15, 2026 |
| BlackRock, Inc. | 8.20% | 2.34M | 13G | Apr 23, 2025 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Sep 15, 2026 | Tobin W. Juvenalofficer: Chief Commercial Officer | Sale | 3,294 | $35.14 | 58,584 |
| Sep 14, 2026 | Tobin W. Juvenalofficer: Chief Commercial Officer | Sale | 3,306 | $32.32 | 61,878 |
| Sep 11, 2026 | Derek J. Maetzolddirector, officer: Pres. & Chief Exec. Officer | Sale · 6 lots | 14,518 | $32.02 | 33,747 |
| Sep 1, 2026 | Kristen M. Oelschlagerofficer: Chief Operating Officer | Sale · 2 lots | 4,152 | $33.39 | 13,356 |
| Aug 31, 2026 | Tobin W. Juvenalofficer: Chief Commercial Officer | Sale | 1,730 | $32.81 | 65,184 |
| Aug 28, 2026 | Derek J. Maetzolddirector, officer: Pres. & Chief Exec. Officer | Sale · 8 lots | 17,726 | $33.20 | 32,735 |
| Aug 25, 2026 | Tobin W. Juvenalofficer: Chief Commercial Officer | Sale | 9,050 | $35.04 | 66,914 |
| Aug 25, 2026 | Kristen M. Oelschlagerofficer: Chief Operating Officer | Sale · 2 lots | 12,384 | $34.42 | 72,649 |
| Aug 24, 2026 | Kristen M. Oelschlagerofficer: Chief Operating Officer | Sale | 12,218 | $33.69 | 85,033 |
| Aug 17, 2026 | Tobin W. Juvenalofficer: Chief Commercial Officer | Sale | 1,730 | $29.59 | 75,964 |
House and Senate disclosures
Not reported.