As of the latest Form 4 filed Aug 1, 2025.
What Prime Medicine, Inc. Common Stock insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 5 most recent filings for PRME.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2025-08-01 | 2025-08-01 | NELSEN ROBERT Director | PPurchase | +3.03M | $3.30 | $10.00M | No | Form 4 ↗ |
| 2025-08-01 | 2025-08-01 | ARCH Venture Partners XII, LLC 10% owner | PPurchase | +3.03M | $3.30 | $10.00M | No | Form 4 ↗ |
| 2025-08-01 | 2025-08-01 | ARCH Venture Partners X, LLC 10% owner | PPurchase | +3.03M | $3.30 | $10.00M | No | Form 4 ↗ |
| 2025-06-23 | 2025-06-23 | Liu David R. 10% owner | PPurchase | +21.0K | $2.16 | $45.4K | Yes (planned) | Form 4 ↗ |
| 2025-06-16 | 2025-06-16 | Liu David R. 10% owner | PPurchase | +21.0K | $1.49 | $31.2K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also PRME’s full analysis or the market-wide insider trading feed. The tabs above jump to PRME’s other SEC data.
Source: SEC Form 4 filings for PRME, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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