PRME
Gv 2021 Gp, L.l.c., PRME's 10% owner, spent $4.95M of their own money on 1.5M shares at $3, growing their stake 85%.
+$4.95M
1.5M sh @ $3
PRME
Prime Medicine, Inc.
SEC CIK 1894562
$2.78
−20.1% · 90 days
90-day buys
$0
0 open-market
90-day sells
$0
0 open-market
Net insider flow
+$0
Net buying
Filings shown
40
Most recent
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At a glance
Insiders at PRME have made no open-market trades in the last 90 days — the activity below is grants, option exercises, and other routine filings.
Largest recent trade: Arch Venture Partners X, Llc, PRME's 10% owner, spent $20M of their own money on 3.2M shares at $6, opening a brand-new position.
Most active filer: Gv 2019 Gp, L.l.c., with 34 transactions among the recent filings shown.
Insider transaction history
Form 4 filings for PRME, newest firstPRME
Nelsen Robert, PRME's 10% owner, spent $10M of their own money on 3.03M shares at $3, growing their stake 95%.
+$10M
3.03M sh @ $3
PRME
Arch Venture Partners Xii, Llc, PRME's 10% owner, spent $10M of their own money on 3.03M shares at $3, growing their stake 95%.
+$10M
3.03M sh @ $3
PRME
Arch Venture Partners X, Llc, PRME's 10% owner, spent $10M of their own money on 3.03M shares at $3, growing their stake 95%.
+$10M
3.03M sh @ $3
PRME
Arch Venture Partners X, Llc, PRME's 10% owner, spent $20M of their own money on 3.2M shares at $6, opening a brand-new position.
+$20M
3.2M sh @ $6
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PRME
−$284.5K
19,003 sh @ $15
PRME
−$563.2K
37,405 sh @ $15
PRME
−$98.1K
6,532 sh @ $15
PRME
−$994.3K
66,659 sh @ $15
PRME
−$430.7K
28,960 sh @ $15
PRME
−$425.1K
28,100 sh @ $15
PRME
−$240.2K
16,031 sh @ $15
PRME
−$227K
15,672 sh @ $14
PRME
−$78.7K
5,000 sh @ $16
PRME
−$253.9K
15,000 sh @ $17
PRME
−$510.2K
29,975 sh @ $17
PRME
−$374.6K
22,434 sh @ $17
PRME
−$642.2K
44,752 sh @ $14
PRME
−$6.9K
471 sh @ $15
PRME
−$227K
16,633 sh @ $14
PRME
−$230.2K
16,805 sh @ $14
PRME
−$172.6K
12,602 sh @ $14
PRME
−$310K
23,161 sh @ $13
PRME
−$107.9K
7,900 sh @ $14
PRME
−$647.6K
43,939 sh @ $15
PRME
−$1.24M
87,922 sh @ $14
PRME
−$877.1K
63,212 sh @ $14
PRME
−$170.1K
13,076 sh @ $13
PRME
−$183.2K
14,022 sh @ $13
PRME
−$191.6K
15,000 sh @ $13
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About PRME insider activity
This page tracks every recent Form 4 filed for Prime Medicine, Inc. with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.
The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.
Frequently asked questions
How often is PRME insider data updated?
Continuously. We read from SEC EDGAR, so new Form 4 filings for Prime Medicine, Inc. usually appear here within minutes of being accepted by the SEC.
What does "net insider flow" mean?
It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.
Why do some rows show grants or option exercises instead of buys?
Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.
Is this investment advice?
No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.