Rapid Micro Biosystems, Inc. (RPID)
Nasdaq: RPID · Laboratory Analytical Instruments · Lexington, MA · filing with the SEC since 2006
Who owns Rapid Micro Biosystems, Inc.
As filed with the SECHolders of 5% or more
5
Bain Capital Life Sciences Fund, L.P. holds 16.8% of Class A Common Stock, par value $0.01 per share, as its SCHEDULE 13G/A filed Aug 14, 2026 says.
Directors and officers
9
report now, of 15 people on the record since 2021. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 5 named at left.
Holders of 5% or moreshare of the class, as filed
Bain Capital Life Sciences Fund, L.P.
SCHEDULE 13G/A · filed Aug 14, 2026 · Class A Common Stock, par value $0.01 per share
Longitude Capital Partners II, LLC
SCHEDULE 13G/A · filed May 15, 2026 · Class A common stock, $0.01 par value per share
Armistice Capital, LLC
SCHEDULE 13G · filed Aug 14, 2026 · Class A common stock, $0.01 par value per share
Spignesi Robert G Jr
SCHEDULE 13D · filed Aug 19, 2025 · Class A Common Stock, $0.01 par value per share
Endeavour Medtech Growth II LP
SCHEDULE 13G/A · filed Feb 13, 2026 · Common Stock, par value $0.01
What RPID reports owning in othersstakes of 5% or more, and other ties
4 subsidiaries in 3 countries, from the list filed with the 10-K filed Mar 12, 2026.
Insider tradesForm 4
9sales
0purchases
0sales on a scheduled plan
3people selling
$500,000sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window5 of 35 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Longitude Prime Partners, LLC | 10% owner | 4 | $500,000 | 0 | 0 | $0 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | 3 | $300,000 | 0 | 0 | $0 |
| Longitude Venture Partners II, L.P. | 10% owner | 1 | $200,000 | 0 | 0 | $0 |
| Wirtjes Sean M | CHIEF FINANCIAL OFFICER | 3 | $100,000 | 0 | 0 | $0 |
| Wilson John J. Addington | CHIEF OPERATING OFFICER | 3 | $100,000 | 0 | 0 | $0 |