Third Rock Ventures VI, L.P.
Ten-percent owner · SEPN
As of 2026-09-16, Third Rock Ventures VI, L.P. has 3 Form 4 transactions on record across 1 company — 0 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Reconstructed holdings
- Direct $161.9M
- Indirect $0
| SEPN | direct | 4,211,659 sh | $161.9M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2025-02-24 | SEPN | Purchase | 18,861 @ $6.00 | $113K | +0.4% of holding | 4,211,659 | Form 4 |
| 2025-02-21 | SEPN | Purchase | 427,668 @ $5.94 | $2.5M | +11.4% of holding | 4,192,798 | Form 4 |
| 2025-02-20 | SEPN | Purchase | 612,674 @ $5.92 | $3.6M | +19.4% of holding | 3,765,130 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.