Form 4: Tempus AI Expands Personalis Stake with Multi-Million Dollar Buy

Tempus AI, a director and 10% owner of Personalis, Inc., reported multiple common stock purchases totaling over $2.5 million in late 2025.

Summary

• Tempus AI, Inc., a director and 10% owner of Personalis, Inc. (PSNL), acquired a total of 320,267 shares of Personalis Common Stock through multiple open market purchases.
• The transactions occurred between November 18, 2025, and December 22, 2025.
• The purchase prices ranged from a weighted average of $7.67 to $11.00 per share.
• The total value of the shares purchased is approximately $2,539,188.17.
• Following these transactions, Tempus AI, Inc. directly beneficially owns 13,039,067 shares of Personalis, Inc. Common Stock.

Sentiment

Score: 8

Explanation: StockSavvy.ai views this as a strong positive signal. The substantial insider buying by a significant shareholder and director suggests high confidence in Personalis, Inc.'s future, warranting a high sentiment score.

Positives

• Significant insider buying by Tempus AI, Inc., a director and 10% owner, indicates strong confidence in Personalis, Inc.'s future prospects.
• The aggregate value of shares purchased exceeds $2.5 million, representing a substantial investment by a key stakeholder.
• The transactions were made pursuant to a Rule 10b5-1(c) plan, suggesting a pre-planned investment strategy.

Future Outlook

The filing indicates a series of planned purchases under a Rule 10b5-1(c) plan, suggesting a strategic, long-term positive outlook by Tempus AI, Inc. regarding Personalis, Inc.'s future performance.

Management Comments

• Tempus AI, Inc. undertakes to provide full information regarding the number of shares purchased at each separate price within the reported ranges upon request to the Issuer, any security holder, or the SEC staff.

Industry Context

StockSavvy.ai notes that significant insider buying, especially by a 10% owner and director, often signals strong internal confidence in a company's future prospects, which can be a positive indicator for the market. This activity in the genomics and biotechnology sector could suggest an anticipated positive development or undervaluation of Personalis, Inc. within its competitive landscape.

Comparison to Industry Standards

• StockSavvy.ai observes that insider purchases of this magnitude (over $2.5 million) are substantial and typically viewed more favorably than smaller, routine transactions, often signaling a strong conviction from a major shareholder.
• While specific comparable companies or projects are not detailed in this Form 4, such a commitment from a major shareholder like Tempus AI in Personalis, Inc. often outperforms general market sentiment in the short to medium term, assuming the underlying business fundamentals support the conviction.

Corporate Governance

Related Party Transactions

• Tempus AI, Inc. is identified as both a Director and a 10% Owner of Personalis, Inc., making these transactions related-party dealings.

Stakeholder Impact

• Shareholders may view this as a positive indicator, potentially increasing investor confidence and demand for Personalis, Inc. stock.
• Employees and management might interpret this as a vote of confidence from a major investor, potentially boosting morale.

Key Dates

Recommendation

The significant insider buying by Tempus AI, Inc., a director and 10% owner of Personalis, Inc., signals strong conviction in the company's prospects. Such substantial investment by a well-informed party, especially under a 10b5-1 plan, suggests an expectation of future value appreciation. This action provides a compelling reason for investors to consider a 'strong buy' position, aligning with the insider's demonstrated confidence.

Keywords

Personalis, PSNL, Tempus AI, Insider Buying, Stock Purchase, Form 4, Equity Acquisition, Biotechnology, Genomics