Security key
75340L104
RAPID MICRO BIOSYSTEMS, INC. - Class A common stock, $0.01 par value per share (RPID)
CUSIP: 75340L104
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Class A common stock, $0.01 par value per share
- Total 13F shares
- 14,620,290
- Total 13F value
- $42,504,363
- Share change
- -241,171
- SEC-reported price per share
- $2.90
- Number of holders
- 42
- Value change
- -$778,137
- Number of buys
- 24
- Number of sells
- 9
- Shares outstanding
- 41,037,733
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
42
Top holders
10
RPID full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q1 2026
Previous quarter: Q3 2025
RAPID MICRO BIOSYSTEMS, INC. SEC filings
RAPID MICRO BIOSYSTEMS, INC. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 75340L104
Recent filing periods:
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
Robert G. Spignesi Jr.
Disclosed value leader
Bain Capital Life Science...
Comparable rows
15/15
Latest evidence
31 Dec 2025
13D/G
13F
Lead comparable stake: 6.3%
13D/G row: Robert G. Spignesi Jr.
Showing 1-6 of 15 holder rows.
Quick read
Robert G. Spignesi Jr. leads the comparable SEC ownership view at 6.3%.
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 Robert G. Spignesi Jr.'s linked filing trail.
Comparable ownership
Top 5
Robert G. Spignesi Jr.
6.3%
Endeavour Medtech Growth II LP
5.7%
Bain Capital Life Sciences Invest...
21%
ABG-WTT Global Life Science Capit...
4.5%
VANGUARD GROUP INC
2.4%
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 |
|---|---|---|---|---|---|
| Robert G. Spignesi Jr. |
13D/G
SPIGNESI ROBERT G JR
|
6.3%
|
$9,133,033
2,647,256 shares
|
$0 | 28 Mar 2024 |
| Endeavour Medtech Growth II LP |
13D/G
|
5.7%
|
$6,545,587
2,257,099 shares
|
$0 | 31 Dec 2025 |
| Bain Capital Life Sciences Investors, LLC |
13F
Company
|
21%
|
$28,171,430
8,434,560 shares
|
— | 30 Sep 2025 |
| ABG-WTT Global Life Science Capital Partners GP Ltd |
13F
Company
|
4.5%
|
$6,173,309
1,848,296 shares
|
— | 30 Sep 2025 |
| VANGUARD GROUP INC |
13F
Company
|
2.4%
|
$3,223,160
965,018 shares
|
— | 30 Sep 2025 |
| Parkman Healthcare Partners LLC |
13F
Company
|
2.2%
|
$3,050,900
913,443 shares
|
— | 30 Sep 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 Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
42
Shares
14,620,290
Rows available
42
| 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 Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
29
Q4 2025 holders
42
Holder diff
13
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend