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 $3.18 per share under a pre-arranged trading plan.

Summary

• Robert Gardner Harrison, Chief Information Officer of Sera Prognostics, Inc. (SERA), disposed of 2,000 shares of Class A Common Stock.
• The transaction occurred on October 7, 2025, at a weighted average price of $3.18 per share.
• The shares were sold in multiple transactions with prices ranging from $3.04 to $3.28.
• This sale 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 97,932 shares of Class A Common Stock directly.

Sentiment

Score: 5

Explanation: The sentiment is neutral. While an insider sale could be seen negatively, the transaction was executed under a pre-arranged Rule 10b5-1 trading plan, which suggests it was not based on immediate, non-public information and is part of a scheduled personal financial management strategy.

Negatives

• An insider sale, even if pre-planned, can sometimes be perceived as a lack of confidence by some investors, though the 10b5-1 plan mitigates this.

Future Outlook

N/A

Industry Context

This filing reports a routine insider transaction and does not provide information directly related to broader industry trends or competitors.

Stakeholder Impact

• Shareholders: A minor reduction in insider ownership, but the pre-planned nature of the sale under Rule 10b5-1 typically minimizes concerns about management's immediate view of the company's prospects.

Key Dates

Recommendation

The sale of 2,000 shares by the Chief Information Officer, executed under a pre-arranged 10b5-1 trading plan, is a routine insider transaction. It does not provide new material information about the company's operational performance, financial health, or strategic direction that would warrant a change in investment recommendation. Investors should continue to hold based on broader company fundamentals rather than this specific insider transaction.

Keywords

SERA, Sera Prognostics, insider trading, Form 4, stock sale, Robert Gardner Harrison, CIO, 10b5-1 plan