Form 4: Longitude Capital Entities Exercise Warrants, Sell RPID Shares

Entities affiliated with Longitude Capital, including 10% owners and directors, exercised warrants and subsequently sold shares of Rapid Micro Biosystems Class A Common Stock.

Summary

• Longitude Venture Partners II, L.P. (LVPII) exercised warrants to acquire 629,032 shares of Rapid Micro Biosystems Class A common stock at an exercise price of $0.05 per share.
• The warrant exercise on January 23, 2026, was conducted on a cashless basis, leading to the Issuer withholding 7,739 shares to cover the exercise price.
• LVPII's beneficial ownership after these transactions is 4,029,245 shares, held indirectly.
• Longitude Prime Fund, L.P. (LPF) sold a total of 101,000 shares of Class A common stock across three separate transactions.
• LPF sold 46,000 shares on January 30, 2026, at an average price of $4.5435 per share.
• LPF sold 27,500 shares on February 2, 2026, at an average price of $4.246 per share.
• LPF sold another 27,500 shares on February 3, 2026, at an average price of $4.2415 per share.
• LPF's beneficial ownership after these sales is 49,000 shares, held indirectly.
• Patrick G. Enright and Juliet Tammenoms Bakker, as managing members of the general partners of LVPII and LPF, may be deemed to share voting and dispositive power over these shares but disclaim beneficial ownership except for their pecuniary interest.

Sentiment

Score: 4

Explanation: StockSavvy.ai views this as a moderately negative signal due to the substantial insider selling by entities affiliated with a 10% owner and director, despite the initial warrant exercise for a significant number of shares.

Positives

• Warrant exercise at a low price ($0.05) indicates a significant profit margin for the reporting persons on the shares acquired.

Negatives

• Significant sales of Class A Common Stock by Longitude Prime Fund, L.P. totaling 101,000 shares over several days.
• The sales occurred at prices ranging from $4.064 to $4.5435, which are substantially higher than the warrant exercise price, suggesting profit-taking.

Future Outlook

NA

Industry Context

StockSavvy.ai notes that insider transactions, particularly sales by significant shareholders and directors, are closely watched indicators in the biotechnology and diagnostics industry, as they can sometimes signal management's perception of future prospects or simply be part of a pre-arranged diversification strategy.

Management Changes

Related Party Transactions

• Longitude Capital Partners II, LLC, Longitude Venture Partners II, L.P., Longitude Prime Partners, LLC, Longitude Prime Fund, L.P., Patrick G. Enright, and Juliet Tammenoms Bakker are all reporting persons identified as 10% owners and/or directors of Rapid Micro Biosystems, Inc.
• The transactions involve the exercise of warrants and subsequent sales of shares by these affiliated entities.

Stakeholder Impact

• Shareholders: The selling activity by significant shareholders and directors could be perceived negatively, potentially leading to downward pressure on the stock price.

Key Dates

Recommendation

While the warrant exercise indicates a long-term investment thesis at a very low cost basis, the subsequent and significant selling by affiliated entities, including a 10% owner and director, suggests profit-taking or a re-evaluation of their position. This insider selling activity, even if pre-planned, could create negative sentiment. Investors should hold and monitor future insider activity and company performance for clearer signals.

Keywords

Rapid Micro Biosystems, RPID, SEC Form 4, Insider Trading, Warrant Exercise, Stock Sale, Longitude Capital, Beneficial Ownership, Director Transaction, 10% Owner