ARCH Venture Fund XII, L.P. - 07 Aug 2025 SCHEDULE 13D/A Report for Prime Medicine, Inc. Common Stock, $0.00001 par value (PRME)

Filing Manager
ARCH Venture Fund XII, L.P.
Reporting Manager
Robert Nelsen
Security
Prime Medicine, Inc. Common Stock, $0.00001 par value
Symbol
PRME
Shares outstanding
178,721,500 shares
Disclosed Ownership
18,587,036 shares
Ownership
10%
Form type
SCHEDULE 13D/A
Filing time
11 Aug 2025, 21:48:39 UTC
Date of event
07 Aug 2025
SEC
View on sec.gov

Quoteable Key Fact

"ARCH Venture Fund XII, L.P. disclosed 10% ownership in Prime Medicine, Inc. Common Stock, $0.00001 par value (PRME) on 07 Aug 2025."

Quick Takeaways

  • ARCH Venture Fund XII, L.P. filed SCHEDULE 13D/A for Prime Medicine, Inc. Common Stock, $0.00001 par value (PRME).
  • Disclosed ownership: 10%.
  • Date of event: 07 Aug 2025.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 11 Aug 2025, 21:48.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Source Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (12)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
ARCH Venture Fund X, L.P. 10% 18,486,894 0 18,486,894 ARCH Venture Partners X, L.P. its General Partner 0001757011
ARCH Venture Fund X Overage, L.P. 10% 18,486,894 0 18,486,894 ARCH Venture Partners X Overage, L.P. its General Partner 0001757017
ARCH Venture Fund XII, L.P. 10% 18,486,894 0 18,486,894 ARCH Venture Partners XII, L.P. its General Partner 0001906837
ARCH Venture Partners X, L.P. 10% 18,486,894 0 18,486,894 ARCH Venture Partners X, LLC its General Partner 0001782583
ARCH Venture Partners X Overage, L.P. 10% 18,486,894 0 18,486,894 ARCH Venture Partners X, LLC its General Partner 0001768905
ARCH Venture Partners XII, L.P. 10% 18,486,894 0 18,486,894 ARCH Venture Partners XII, LLC its General Partner 0001979765
ARCH Venture Partners X, LLC 10% 18,486,894 0 18,486,894 /s/ Mark McDonnell Mark McDonnell, as Attorney-in-Fact for Robert Nelsen, Managing Director 0001769012
ARCH Venture Partners XII, LLC 10% 18,486,894 0 18,486,894 /s/ Mark McDonnell Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director 0001979548
Robert Nelsen 10% 18,587,036 100,142 18,486,894 /s/ Mark McDonnell Mark McDonnell, as Attorney-in-Fact for Robert Nelsen 0001219042
Keith Crandell 10% 18,486,894 0 18,486,894 /s/ Mark McDonnell Mark McDonnell, as Attorney-in-Fact for Keith Crandell 0001219039
Kristina Burow 10% 18,486,894 0 18,486,894 /s/ Mark McDonnell Mark McDonnell, as Attorney-in-Fact for Kristina Burow 0001569248
Steven Gillis 10% 18,486,894 0 18,486,894 /s/ Mark McDonnell Mark McDonnell, as Attorney-in-Fact for Steven Gillis 0001229592