Form 4: SERA CSO Sells Shares for Tax Obligations

SERA PROGNOSTICS' Chief Scientific Officer, John J. Boniface, sold 1,517 shares of Class A Common Stock to cover tax withholding obligations from RSU vesting.

Summary

• John J. Boniface, Chief Scientific Officer of SERA PROGNOSTICS, INC. (SERA), reported a sale of 1,517 shares of Class A Common Stock.
• The transaction occurred on March 11, 2026, at a weighted average price of $2.04 per share.
• The shares were sold as part of a block trade with prices ranging from $1.90 to $2.30.
• The sale was non-discretionary, mandated by the issuer's policy to cover tax withholding obligations associated with the vesting of restricted stock units (RSUs).
• Following this transaction, Mr. Boniface beneficially owns 145,842 shares of Class A Common Stock directly.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event. The sale was non-discretionary and for tax purposes, indicating no change in the insider's sentiment towards the company's future.

Future Outlook

This filing does not contain any forward-looking statements or guidance regarding the company's future performance or outlook.

Management Comments

• The sale represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units ('RSUs').
• The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by 'sell to cover' transactions and does not represent a discretionary transaction by the Reporting Person.

Industry Context

StockSavvy.ai notes that 'sell to cover' transactions are a common and routine occurrence for executives receiving equity compensation, particularly restricted stock units. They typically do not reflect a change in management's confidence in the company's future prospects but rather a mechanism to satisfy tax liabilities upon vesting.

Stakeholder Impact

• Shareholders: Minimal impact, as this is a routine, non-discretionary transaction for tax purposes and does not signal a change in insider confidence.

Key Dates

Keywords

SERA PROGNOSTICS, SERA, Form 4, Insider Trading, Stock Sale, Restricted Stock Units, Tax Withholding, Chief Scientific Officer