Form 4: SERA CIO Sells 2,000 Shares Under 10b5-1 Plan

SERA Prognostics' Chief Information Officer, Robert Gardner Harrison, sold 2,000 shares of Class A Common Stock for a weighted average price of $2.97 per share.

Summary

• Robert Gardner Harrison, Chief Information Officer of SERA Prognostics, Inc. (SERA), reported a transaction.
• The transaction involved the sale of 2,000 shares of Class A Common Stock.
• The sale occurred on January 27, 2026, at a weighted average price of $2.97 per share.
• The shares were sold in multiple transactions with prices ranging from $2.92 to $3.06.
• This transaction was executed pursuant to a Rule 10b5-1 trading plan adopted by Mr. Harrison on May 21, 2025.
• Following this transaction, Mr. Harrison beneficially owns 82,788 shares of Class A Common Stock directly.

Sentiment

Score: 5

Explanation: The filing reports a routine, pre-planned insider stock sale, which is a personal financial event for the insider and does not inherently indicate a positive or negative outlook for the company's operational performance or future prospects.

Positives

• The sale was conducted under a pre-arranged Rule 10b5-1 trading plan, indicating a planned personal financial management decision rather than a reaction to new company-specific information.

Negatives

• The transaction represents a reduction in the Chief Information Officer's direct beneficial ownership of the company's Class A Common Stock by 2,000 shares.

Risks

• Potential for negative market perception regarding insider selling, even if pre-planned, which could lead to minor investor concern.

Stakeholder Impact

• Shareholders: The sale represents a minor reduction in insider ownership, which could be perceived neutrally given the pre-planned nature, or slightly negatively by some investors.

Key Dates

Recommendation

The reported insider sale is a routine transaction executed under a pre-arranged 10b5-1 plan and involves a relatively small number of shares (2,000 shares, approximately $5,940). This event does not provide sufficient new information to alter an existing investment thesis or warrant a change in recommendation, thus a 'hold' recommendation is maintained.

Keywords

SERA Prognostics, SERA, Form 4, Insider Trading, Stock Sale, Robert Gardner Harrison, Chief Information Officer, 10b5-1 plan