Mathers Edward T 4

What Happened
Edward T. Mathers, a reported 10% owner of Korro Bio (KRRO), purchased two securities on March 10, 2026: 207,100 shares of common stock at $11.11 each for $2,300,881, and 242,945 pre‑funded warrants at $11.11 each for $2,698,876. The combined cash outlay for both transactions was $4,999,757 (≈ $5.0M). These were purchases (insider buys), not sales.

Key Details

• Transaction dates and prices: March 10, 2026 — 207,100 common shares @ $11.11 ($2,300,881); 242,945 pre‑funded warrants @ $11.11 ($2,698,876).
• Shares owned after transaction: Not specified in the Form 4 filing.
• Footnotes of note:
  • F1: Shares/warrants were acquired from the issuer under a Subscription Agreement dated March 9, 2026.
  • F3: The pre‑funded warrants are exercisable but include an ownership cap—exercise may be limited so the holder doesn’t exceed 9.99% ownership (adjustable up to 19.99% with 61 days’ notice).
  • F2: Contains a beneficial‑ownership disclaimer related to NEA entity structures (legal allocation of ownership among related NEA entities).
• Filing timeliness: Reported Period of Report 3/10/2026 and filed 3/12/2026 — the Form 4 appears to have been filed on time (within the usual two‑business‑day window).

Context

• Pre‑funded warrants are a form of purchase that allow the buyer to acquire common shares later (often immediately exercisable subject to ownership limits); they are not the same as stock option exercises or awards.
• As a 10% owner, Mathers’ purchase is from an owner/investor perspective rather than a routine employee trade; purchases by insiders can be interpreted as a stronger signal than sales but do not by themselves explain motivation.