Rapid Micro Biosystems (RPID)
Automates microbial quality-control workflows for pharmaceutical, medical-device, and personal-care manufacturing.
$1.19
After hours+0.03 (+3.03%)
At close$1.16(+2.21%)
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13F · 13D/G · Form 4
| Institutions | 34.94% | 17.52M shares | |
|---|---|---|---|
| 34 holders · as of Jun 30, 2026 | |||
| Insiders | 8.30% | 4.16M shares | |
| 9 holders · as of Jul 24, 2026 | |||
| Strategic holders | 7.04% | 3.53M shares | |
| 1 holder · as of May 15, 2026 | |||
| Other | 49.72% | 24.95M shares | |
| remainder | |||
50.16M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
Two share counts disagree (50.16M in the company's Sep 22, 2026 report, 45.32M elsewhere); stakes use the report.
This company has 2 share classes; every stake here is a share of the whole company.
13F, as of Jun 30, 2026
34 holders · 17.52M shares · 5 new positions · 14 increased · 13 reduced · 17 closed
| Holder | Shares | % of company | Chg q/q | Filed |
|---|---|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 8.43M | 16.82% | 0 | Aug 14, 2026 |
| Armistice Capital, LLC | 3.33M | 6.63% | +3.33Mnew | Aug 14, 2026 |
| Abg-WTT Global Life Science Capital Partners GP Ltd | 1.85M | 3.68% | 0 | Aug 14, 2026 |
| Vanguard Capital Management LLC | 982.0K | 1.96% | −460 | Aug 13, 2026 |
| Evernest Financial Advisors, LLC | 506.0K | 1.01% | +73.5K | Aug 6, 2026 |
| Advent International Corp/MA | 379.8K | 0.76% | −172.6K | Aug 14, 2026 |
| Essex Investment Management Co LLC | 362.7K | 0.72% | −521.2K | Aug 6, 2026 |
| Millennium Management LLC | 236.6K | 0.47% | −46.7K | Aug 14, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Longitude Capital Partners II, LLC | 8.60% | 3.53M | 13G | May 15, 2026 |
| Armistice Capital, LLC | 7.29% | 3.33M | 13G | Aug 14, 2026 |
| Spignesi Robert G Jr | 6.30% | 2.65M | 13D | Aug 19, 2025 |
| Endeavour Medtech Growth II LP | 5.70% | 2.26M | 13G | Feb 13, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| May 20, 2026 | Bain Capital Life Sciences Investors, LLC10 percent owner | Purchase · 3 lots | 4,389,000 | $1.44 | 4,389,000 |
| Mar 10, 2026 | Robert G. Jr. Spignesidirector, officer: PRESIDENT AND CEO | Sale | 17,922 | $4.11 | 1,169,848 |
| Mar 11, 2026 | Sean M. Wirtjesofficer: CHIEF FINANCIAL OFFICER | Sale | 7,480 | $4.32 | 556,194 |
| Mar 11, 2026 | John J. Addington Wilsonofficer: CHIEF OPERATING OFFICER | Sale | 9,603 | $4.32 | 316,762 |
| Feb 19, 2026 | Robert G. Jr. Spignesidirector, officer: PRESIDENT AND CEO | Sale | 38,327 | $3.89 | 1,187,770 |
| Feb 20, 2026 | Sean M. Wirtjesofficer: CHIEF FINANCIAL OFFICER | Sale | 17,254 | $3.92 | 563,674 |
| Feb 20, 2026 | John J. Addington Wilsonofficer: CHIEF OPERATING OFFICER | Sale | 5,403 | $3.92 | 326,365 |
| Feb 9, 2026 | Robert G. Jr. Spignesidirector, officer: PRESIDENT AND CEO | Sale | 12,840 | $3.78 | 962,097 |
| Feb 9, 2026 | Sean M. Wirtjesofficer: CHIEF FINANCIAL OFFICER | Sale | 6,027 | $3.78 | 483,928 |
| Feb 9, 2026 | John J. Addington Wilsonofficer: CHIEF OPERATING OFFICER | Sale | 4,610 | $3.78 | 257,768 |
House and Senate disclosures
Not reported.