ARCH Venture Partners XII, L.P. (CIK 1979765) reported 7 SEC Form 4 insider transactions across 4 companies over the past 18 months (most recent 2026-05-04). Recent activity: Buy SPTX (2.5M shares), Buy SPTX (2.7M shares), Buy SPTX (1.1M shares), Sell MTSR (18.5M shares), Sell MTSR (8.3M shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-04 | Seaport Therapeutics, Inc. (SPTX) | 10% Owner | Buy | 2.5M | $0 |
| 2026-05-04 | Seaport Therapeutics, Inc. (SPTX) | 10% Owner | Buy | 2.7M | $0 |
| 2026-05-04 | Seaport Therapeutics, Inc. (SPTX) | 10% Owner | Buy | 1.1M | $19.8M |
| 2025-11-14 | Metsera, Inc. (MTSR) | Director | Sell | 18.5M | $0 |
| 2025-11-14 | Metsera, Inc. (MTSR) | Director | Sell | 8.3M | $0 |
| 2025-10-29 | Neumora Therapeutics, Inc. (NMRA) | Insider | Buy | 1.9M | $5.0M |
| 2025-08-01 | Prime Medicine, Inc. (PRME) | Insider | Buy | 3.0M | $10.0M |
Source: SEC Form 4 filings · as of 2026-05-04