Harrison Robert Gardner 4

What Happened
Harrison Robert Gardner, Chief Information Officer of Sera Prognostics, sold 3,360 shares on 2026-03-09 in an open-market/block sale. The reported weighted-average price was $1.96 per share (range $1.87–$2.03), resulting in proceeds of approximately $6,586. This sale was a disposition (S) and was done to satisfy tax withholding on vested restricted stock units (RSUs), a routine administrative transaction rather than a discretionary investment decision.

Key Details

• Transaction date: 2026-03-09; Form 4 filed 2026-03-10 (appears timely).
• Shares sold: 3,360; weighted-average price: $1.96; price range in block trade: $1.87–$2.03.
• Proceeds: approx. $6,586.
• Shares owned after transaction: not provided in the supplied filing details.
• Footnotes:
  • F1 — Sale was a "sell-to-cover" required by the issuer to satisfy tax withholding on RSU vesting (not a discretionary sale).
  • F2 — Price is a weighted average from a block trade executed in multiple transactions; detailed per-price breakdown available on request to the SEC/issuer.
• Transaction type: Sale to cover tax obligations on RSUs (code F in substance, reported as S).

Context
Sell-to-cover transactions to satisfy withholding on vested RSUs are common and typically administrative; they do not necessarily indicate the insider's view on the company's prospects. For retail investors, purchases or larger voluntary sales by insiders can be more informative than routine withholding sales.