Form 4: SERA CIO Sells Stock Under 10b5-1 Plan

SERA Prognostics' Chief Information Officer, Robert Gardner Harrison, sold 6,000 shares of Class A Common Stock for $2.22 per share under a pre-arranged trading plan.

Summary

• Robert Gardner Harrison, Chief Information Officer of SERA Prognostics, Inc. (SERA), reported a sale of company stock.
• The transaction involved the disposition of 6,000 shares of Class A Common Stock.
• The shares were sold at a weighted average price of $2.22 per share, with individual sales ranging from $2.17 to $2.25.
• The sale was executed on August 20, 2025.
• This transaction was conducted pursuant to a Rule 10b5-1 trading plan adopted by Mr. Harrison on May 21, 2025.
• Following this transaction, Mr. Harrison beneficially owns 102,577 shares of Class A Common Stock.

Sentiment

Score: 5

Explanation: The sentiment is neutral. While an insider sale can be viewed negatively, the fact that it was conducted under a pre-arranged Rule 10b5-1 plan mitigates concerns that it is based on new, negative material information. It represents a scheduled liquidity event rather than an immediate reaction to company performance.

Negatives

• An insider sale, even under a 10b5-1 plan, can sometimes be perceived as a lack of confidence in the company's near-term prospects, although the pre-arranged nature mitigates this.

Future Outlook

The filing does not provide any forward-looking statements or guidance regarding the company's future performance or strategic direction.

Industry Context

This Form 4 filing is a routine disclosure of an insider stock transaction and does not provide broader industry context or trends. Insider transactions are common across all industries and are typically monitored for insights into management's perception of company value.

Stakeholder Impact

• Shareholders: The sale by a Chief Information Officer could be interpreted by some shareholders as a minor negative signal, though the 10b5-1 plan reduces this impact. It represents a small reduction in insider ownership.

Key Dates

Keywords

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