SCHEDULE: Longitude Capital Updates Rapid Micro Biosystems Stake

Longitude Capital Partners II, LLC and associated entities reported a beneficial ownership of 8.6% in Rapid Micro Biosystems, Inc. as of March 31, 2026.

Summary

• Longitude Capital Partners II, LLC, Longitude Venture Partners II, L.P., Patrick G. Enright, and Juliet Tammenoms Bakker collectively report beneficial ownership of 3,529,245 shares of Rapid Micro Biosystems, Inc. Class A common stock.
• This holding represents 8.6% of the total outstanding Class A common stock, based on 41,267,511 shares outstanding as of March 31, 2026.
• The reporting persons share voting and dispositive power over these securities.
• Longitude Prime Partners, LLC and Longitude Prime Fund, L.P. report 0% ownership.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral regulatory filing that confirms existing institutional support without signaling new strategic shifts or financial changes.

Positives

• The filing confirms continued significant institutional investment in the company by Longitude Capital.

Negatives

• None identified; this is a standard regulatory disclosure of beneficial ownership.

Risks

• The reporting persons disclaim beneficial ownership of shares except to the extent of their pecuniary interest, which is standard but highlights the complexity of the ownership structure.

Future Outlook

No specific forward-looking guidance or operational outlook provided in this ownership disclosure.

Industry Context

StockSavvy.ai notes that this filing is a routine regulatory update regarding institutional ownership levels, which is common for venture capital firms maintaining long-term positions in biotech and life sciences companies.

Comparison to Industry Standards

• The filing adheres to standard SEC requirements for reporting beneficial ownership under Section 13(d) of the Securities Exchange Act.
• The disclosure of shared voting and dispositive power is consistent with standard practices for venture capital fund structures.

Related Party Transactions

• The filing notes that general and limited partners or members of the reporting entities may be deemed to have the right to receive dividends or proceeds from the sale of the issuer's securities.

Stakeholder Impact

• Provides transparency to shareholders regarding the concentration of ownership by institutional investors.

Next Steps

• Continued monitoring of future SEC filings for any changes in ownership status or divestment activities.

Key Dates

Keywords

Rapid Micro Biosystems, Schedule 13G, Beneficial Ownership, Longitude Capital, Institutional Investor, Class A Common Stock