Prime Medicine, Inc. (PRME) · Insider trading
What Prime Medicine's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$0
0 insiders, 0 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
$0
bought less sold
Latest filing
2025-08-05
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Crandell Keith10% owner | $10.00M | – | 1 | 2025-08-01 | – |
| Arch Venture Fund Xii, L.P.10% owner | $10.00M | – | 1 | 2025-08-01 | – |
| Nelsen RobertDirector, 10% owner | $10.00M | – | 1 | 2025-08-01 | – |
| Alphabet Inc.10% owner | $4.95M | – | 1 | 2025-08-01 | – |
| Liu David R.10% owner | $163,170 | – | 4 | 2025-06-30 | 20,240,945 |
| Reine AllanDirector, Chief Executive Officer | $147,500 | – | 1 | 2025-05-21 | 125,000 |
| Lee Ann L.Chief Technical Officer | $113,000 | – | 1 | 2025-05-21 | 100,000 |
| Brudnick RichardChief Business Officer | $23,800 | – | 1 | 2025-05-20 | 20,000 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2025-08-01 | Alphabet Inc.10% ownerwith Gv 2021, L.P., Gv 2021 GP, L.L.C., Gv 2021 GP, L.P. | Buyindirect | 1,500,000 | 3.30 | $4.95M | 3,262,440 | Form 4 |
| 2025-08-01 | Crandell Keith10% ownerwith Gillis Steven, Burow Kristina, Arch Venture Fund X, L.P., Arch Venture Fund X Overage, L.P., Arch Venture Partners X Overage, L.P., Arch Venture Partners X, LLC, Arch Venture Partners X, L.P. | Buyindirect | 3,030,300 | 3.30 | $10.00M | 6,230,300 | Form 4 |
| 2025-08-01 | Arch Venture Fund Xii, L.P.10% ownerwith Arch Venture Partners Xii, LLC, Arch Venture Partners Xii, L.P. | Buyindirect | 3,030,300 | 3.30 | $10.00M | 6,230,300 | Form 4 |
| 2025-08-01 | Nelsen RobertDirector, 10% owner | Buyindirect | 3,030,300 | 3.30 | $10.00M | 6,230,300 | Form 4 |
| 2025-06-30 | Liu David R.10% owner | Buyplan | 21,000 | 2.52 | $52,920 | 20,240,945 | Form 4 |
| 2025-06-23 | Liu David R.10% owner | Buyplan | 21,000 | 2.16 | $45,360 | 20,219,945 | Form 4 |
| 2025-06-16 | Liu David R.10% owner | Buyplan | 21,000 | 1.49 | $31,290 | 20,198,945 | Form 4 |
| 2025-06-11 | Liu David R.10% owner | Buyplan | 21,000 | 1.60 | $33,600 | 20,177,945 | Form 4 |
| 2025-05-21 | Reine AllanDirector, Chief Executive Officer | Buy | 125,000 | 1.18 | $147,500 | 125,000 | Form 4 |
| 2025-05-21 | Lee Ann L.Chief Technical Officer | Buy | 100,000 | 1.13 | $113,000 | 100,000 | Form 4 |
| 2025-05-20 | Brudnick RichardChief Business Officer | Buy | 20,000 | 1.19 | $23,800 | 20,000 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.