Form 4: Foresite Capital Boosts ALUMIS Stake with $7M Share Purchase

Foresite Capital Management VI LLC and affiliated entities reported the purchase of 411,764 shares of ALUMIS INC. common stock at $17 per share, increasing their collective indirect beneficial ownership to over 16 million shares.

Summary

• Foresite Capital Management VI LLC, along with several affiliated entities, reported transactions involving ALUMIS INC. common stock.
• On January 8, 2026, Foresite Capital Fund V, L.P. acquired 117,647 shares of ALUMIS INC. common stock at a price of $17 per share.
• On the same date, Foresite Capital Opportunity Fund V, L.P. acquired 294,117 shares of ALUMIS INC. common stock at a price of $17 per share.
• The total number of shares acquired in these reported transactions is 411,764.
• Following these transactions, the Foresite group's total indirect beneficial ownership in ALUMIS INC. common stock is 16,189,804 shares, distributed among various affiliated funds and entities.
• The reporting persons are identified as both a Director and a 10% Owner of ALUMIS INC.

Sentiment

Score: 7

Explanation: The sentiment is positive due to significant insider buying by a major institutional investor and 10% owner, indicating strong confidence in the company's valuation or future performance.

Positives

• Significant insider buying by a major institutional investor and 10% owner, Foresite Capital, signals confidence in ALUMIS INC.'s future prospects.
• The purchase of 411,764 shares at $17 per share represents a substantial investment of $7,000,000 by the Foresite group.
• Increased institutional ownership can enhance market credibility and stability for ALUMIS INC.

Future Outlook

This Form 4 filing does not contain forward-looking statements or guidance regarding ALUMIS INC.'s future outlook.

Management Comments

• James B. Tananbaum, as Managing Member of Foresite Capital Management V, LLC, Foresite Capital Opportunity Management V, LLC, Foresite Capital Management VI, LLC, and Foresite Labs Management I, LLC, and a manager of Foresite Labs, LLC, is deemed to have sole or shared voting and dispositive power over the reported shares.

Industry Context

This insider purchase by a significant institutional investor and 10% owner suggests a positive internal view of ALUMIS INC.'s value or future prospects, which can be a notable signal within the biotechnology or pharmaceutical industry, where capital raises and strategic investments are common.

Related Party Transactions

• The reported transactions involve Foresite Capital Management VI LLC and its affiliates, which are identified as a 10% owner and have director representation on ALUMIS INC.'s board. Transactions between a company and its 10% owners or directors are considered related party transactions.

Stakeholder Impact

• Shareholders may view the significant insider buying as a vote of confidence from a major investor, potentially leading to increased investor interest and positive sentiment.
• The increased ownership by Foresite Capital could strengthen its influence on corporate governance and strategic decisions at ALUMIS INC.

Key Dates

Keywords

ALUMIS INC., ALMS, Foresite Capital, Insider Buying, Beneficial Ownership, Stock Purchase, Institutional Investment, Form 4, Equity Acquisition