Insider trade

Prime Medicine (PRME)10% owner bought ~$10M

ARCH Venture Partners XII, 10% owner at Prime Medicine, bought ~$10M of Prime Medicine shares.

~$10M
Approx. value · 3.03M sh @ $3.30: 6.23M
Holds after · shares reported

Traded: Aug 1, 2025
Filed: Aug 1, 2025

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

Jun 11, 2025Insider10% owner purchased ~$34K of PRME shares in the open market
Jun 16, 2025Insider10% owner purchased ~$31K of PRME shares in the open market
Jun 23, 2025Insider10% owner purchased ~$45K of PRME shares in the open market
Jun 30, 2025Insider10% owner purchased ~$53K of PRME shares in the open market
Aug 1, 2025 · this disclosureInsider10% owner purchased ~$10M of PRME shares in the open market

What came next

Aug 1, 2025Insider · 3 peopleInsiders: 3 purchases (~$24.9M)
Nov 7, 2025Company filing · Form 8-K · ResultsReported its results

View the official recordSEC Form 4

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Prime Medicine

For Prime Medicine, OQRO holds 1 fund holdings report (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its PRME page.

Other recent filings by ARCH Venture Partners XII, LLC, 10% owner

SEC Form 4 at Neumora Therapeutics (NMRA)Oct 29, 2025

The full history of ARCH Venture Partners XII, LLC, 10% owner is on the profile page.

How this filing works

Other disclosures at Prime Medicine

Everything OQRO holds on this company is on its PRME page.

This is one filing. OQRO holds the rest

Insider trades filed with the SEC, stock trades disclosed by members of Congress, fund holdings from 13F filings and federal contract awards, each one in plain words next to its official filing. On this page it opens why the trade stands out, what the company did around that time, the price since, and every field of the form.

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OQRO describes public disclosures and context calculated from them. It does not give personalized advice and does not recommend any transaction. How OQRO treats data