Boniface John J. 4

What Happened
Boniface John J., Chief Scientific Officer of SERA Prognostics, sold 3,038 shares on 2026-03-09 at a weighted average price of $1.96 per share for total proceeds of approximately $5,954. The sale is reported as an open market/private sale (code S) but, per the filing, was a "sell to cover" to satisfy tax withholding on vested restricted stock units (RSUs), not a discretionary trade by the insider.

Key Details

• Transaction date: 2026-03-09 (reported on Form 4 filed 2026-03-10). Filing appears timely.
• Shares sold: 3,038; weighted average price: $1.96; total reported proceeds: ~$5,954.
• Price range for the block trade: $1.87 to $2.03 (shares sold as part of a block trade in multiple transactions). Reporting person will provide exact allocations by price upon request (per footnote).
• Footnote F1: Sale mandated by issuer's "sell to cover" election to satisfy tax withholding on vested RSUs (not discretionary).
• Footnote F2: Price is a weighted average; multiple trade prices in the $1.87–$2.03 range.
• Shares owned after transaction: Not specified in the provided filing excerpt.

Context
"Sell to cover" transactions are routine tax-withholding sales that do not necessarily indicate an insider's view of the company's prospects. This was not a purchase or an options exercise; it was a compelled sale to meet tax obligations related to RSU vesting.