ARCH Venture Partners XII, LLC insider trades
ARCH Venture Partners XII, LLC has filed 5 Form 4s with the SEC that we hold, for Neumora Therapeutics, Inc. (NMRA) (10% owner), MTSR (Director, 10% owner) and Prime Medicine, Inc. (PRME) (10% owner). Across all of them we count 5 purchases worth $26.1M and 0 sales worth $0 reported on Form 4. In the last 12 months: 1 purchase ($5.0M) and 0 sales ($0). The largest single trade was a purchase of 3,200,000 shares of Prime Medicine, Inc. worth $20.0M, dated 2024-02-15. The first filing on our record is dated 2023-11-07 and the latest 2025-11-14.
Neumora Therapeutics, Inc. (NMRA)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2023-11-03 | P, purchase reported on Form 4 | 22,420 | $255.1K | 2023-11-07 |
| 2023-11-06 | P, purchase reported on Form 4 | 43,082 | $497.6K | 2023-11-07 |
| 2023-11-07 | P, purchase reported on Form 4 | 30,192 | $347.2K | 2023-11-07 |
| 2025-10-27 | P, purchase reported on Form 4 | 1,915,700 | $5.0M | 2025-10-29 |
MTSR
No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.
Prime Medicine, Inc. (PRME)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2024-02-15 | P, purchase reported on Form 4 | 3,200,000 | $20.0M | 2024-02-20 |
Counted from the Form 4 filings this reporting owner (SEC CIK 1979548) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.
Source: U.S. Securities and Exchange Commission (EDGAR) and other official
government data · Updated 2026-10-12 ·
For informational purposes only, not investment advice.
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