Portolan Capital Management, LLC 13D and 13G filings for Castle Biosciences, Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2026-05-15 4:10 pm Sale | 2026-03-31 | 13G | CASTLE BIOSCIENCES INC CSTL | Portolan Capital Management, LLC | 1,350,283 4.450% | -260,816 (-16.19%) | Filing |
| 2025-04-14 3:34 pm Purchase | 2025-04-07 | 13G | CASTLE BIOSCIENCES INC CSTL | Portolan Capital Management, LLC | 1,611,099 5.650% | 1,611,099 (New Position) | Filing |