Rapid Micro Biosystems, Inc.
RPID- Exchange
- Nasdaq
- Industry
- Laboratory Analytical Instruments
- SEC CIK
- 0001380106
No open-market purchases or sales by Rapid Micro Biosystems, Inc. insiders were filed in the last 90 days; 34 institutions reported holding it in 13F filings for Q2 2026, worth $30.3M in total; no superinvestor holds it.
Holders of 5% or more of RPID
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Rapid Micro Biosystems, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Longitude Capital Partners II, LLC | 13G/A | 8.60%3.53M shares | – | May 15, 20261 filing | May 15, 2026 | SEC |
| Spignesi Robert G. Jr. | 13D | 6.30%2.65M shares | New | Aug 19, 20251 filing | Aug 19, 2025 | SEC |
| Endeavour Medtech Growth II LP | 13G/A | 5.70%2.26M shares | – | Feb 13, 20261 filing | Feb 13, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
3 Schedule 13D and 13G filings on Rapid Micro Biosystems, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 15, 20264:43 PM ET | Longitude Capital Partners II, LLCand 5 others | 13G/A | 8.60%3.53M shares | – | Mar 31, 2026 | SEC |
| Feb 13, 20264:50 PM ET | Endeavour Medtech Growth II LPand 2 others | 13G/A | 5.70%2.26M shares | – | Dec 31, 2025 | SEC |
| Aug 19, 20255:39 PM ET | Spignesi Robert G. Jr. | 13D | 6.30%2.65M shares | New | Mar 28, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Rapid Micro Biosystems, Inc. shares.
No Form 144 notices for Rapid Micro Biosystems, Inc. are on file.