RAPID MICRO BIOSYSTEMS, INC. - Class A common stock, $0.01 par value per share (RPID)

Q: What does CUSIP 75340L104 represent in this 13F holders report?

CUSIP 75340L104 is the security identifier for RPID - RAPID MICRO BIOSYSTEMS, INC. - Class A common stock, $0.01 par value per share used to aggregate holder disclosures.

Q: How many institutions held RPID - RAPID MICRO BIOSYSTEMS, INC. - Class A common stock, $0.01 par value per share in Q1 2026?

46 institutional investors reported RPID - RAPID MICRO BIOSYSTEMS, INC. - Class A common stock, $0.01 par value per share for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: 75340L104

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Class A common stock, $0.01 par value per share
Total 13F shares: 15,839,879
Total 13F value: $35,996,385
Share change: +1,096,307
SEC-reported price per share: $2.27
Number of holders: 46
Value change: +$1,911,287
Number of buys: 27
Number of sells: 16
Shares outstanding: 41,037,733

Security key

75340L104

Report period

Q1 2026

Institutions

Top holders

RPID full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Previous quarter: Q4 2025 RAPID MICRO BIOSYSTEMS, INC. SEC filings RAPID MICRO BIOSYSTEMS, INC. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 75340L104

Newer quarter: Q2 2026 Previous quarter: Q4 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of RPID - RAPID MICRO BIOSYSTEMS, INC. - Class A common stock, $0.01 par value per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Longitude Capital Partner...

Disclosed value leader

Bain Capital Life Science...

Comparable rows

15/15

Latest evidence

27 Feb 2026

3/4/5 13D/G 13F Lead comparable stake: 8.6% 13D/G row: Longitude Capital Partners II, LLC Showing 1-6 of 15 holder rows.

Quick read

Longitude Capital Partners II, LLC leads the comparable SEC ownership view at 8.6%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Longitude Capital Partners II, LLC's linked filing trail.

Comparable ownership Top 5

Longitude Capital Partners II, LLC 8.6%

Robert G. Spignesi Jr. 6.3%

Endeavour Medtech Growth II LP 5.7%

Natale S. Ricciardi 0.07%

Bain Capital Life Sciences Invest... 21%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Longitude Capital Partners II, LLC	3/4/5 13D/G 10%+ Owner 3/4/5 13D/G	8.6% from 13D/G	$11,694,480 4,029,245 shares	-$663,949	04 Feb 2026
Robert G. Spignesi Jr.	13D/G SPIGNESI ROBERT G JR 13D/G	6.3%	$9,133,033 2,647,256 shares	$0	28 Mar 2024
Endeavour Medtech Growth II LP	13D/G 13D/G	5.7%	$6,545,587 2,257,099 shares	$0	31 Dec 2025
Natale S. Ricciardi	3/4/5 Director 3/4/5	0.07%	$22,081 29,442 shares	—	27 Feb 2026
Bain Capital Life Sciences Investors, LLC	13F Company 13F	21%	$24,460,224 8,434,560 shares	—	31 Dec 2025
ABG-WTT Global Life Science Capital Partners GP Ltd	13F Company 13F	4.5%	$5,360,058 1,848,296 shares	—	31 Dec 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

15,839,879

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

Q1 2026 holders

Holder diff

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 value	Q1 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend