RPIDNasdaqLaboratory Analytical InstrumentsFiscal year ends December 31
RAPID MICRO BIOSYSTEMS, INC.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 7, 2026
$0.77+0.01 (+1.20%)
Close on Oct 19, 2026
- Market cap
- $37.40M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
34.9%
18M of 50M shares
Institutional holders
34
5 new, 16 sold out
Net institutional buying
2M
In Q2 2026
Insider trades, 12 months
0 buys · 14 sales
Net sold $1.14M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Bain Capital Life Sciences Fund, L.P. | 7,651,369 | 16.76% | 13G (passive) amendment | Jun 30, 2026 |
| Longitude Capital Partners II, LLC | 3,529,245 | 8.60% | 13G (passive) amendment | Mar 31, 2026 |
| Steven Boyd | 3,328,000 | 7.29% | 13G (passive) | Jun 30, 2026 |
| Spignesi Robert G Jr | 2,647,256 | 6.30% | 13D (active) | Mar 28, 2024 |
| Endeavour Medtech Growth II Parallel LP | 2,257,099 | 5.70% | 13G (passive) amendment | Dec 31, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of RPID | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 8,434,560 | 16.82% | $14.59M | – | 0.87% |
| Armistice Capital, LLC | 3,328,000 | 6.63% | $5.76M | New | 0.07% |
| ABG-WTT Global Life Science Capital Partners GP Ltd | 1,848,296 | 3.68% | $3.20M | – | 37.39% |
| Vanguard Capital Management LLC | 982,034 | 1.96% | $1.70M | −460 | 0.00% |
| Evernest Financial Advisors, LLC | 506,000 | 1.01% | $875.38K | +73,490 | 0.18% |
| Advent International, L.P. | 379,794 | 0.76% | $657.04K | −172,583 | 0.00% |
| Essex Investment Management Co LLC | 362,696 | 0.72% | $627.46K | −521,235 | 0.08% |
| Millennium Management LLC | 236,599 | 0.47% | $409.32K | −46,681 | 0.00% |
| Geode Capital Management, LLC | 228,041 | 0.45% | $394.71K | −19,136 | 0.00% |
| Renaissance Technologies LLC | 212,101 | 0.42% | $366.94K | +85,484 | 0.00% |
| BlackRock, Inc. | 189,832 | 0.38% | $328.41K | +32,600 | 0.00% |
| Legato Capital Management LLC | 119,534 | 0.24% | $206.79K | −155,390 | 0.02% |
| Vanguard Fiduciary Trust Co | 110,484 | 0.22% | $191.14K | +772 | 0.00% |
| Dimensional Fund Advisors LP | 104,192 | 0.21% | $180.25K | +16,603 | 0.00% |
| State Street Corp | 93,874 | 0.19% | $162.40K | – | 0.00% |
| XTX Topco Ltd | 79,727 | 0.16% | $137.93K | +18,657 | 0.00% |
| Sei Investments Co | 66,869 | 0.13% | $115.68K | −217,947 | 0.00% |
| Northern Trust Corp | 42,106 | 0.08% | $72.84K | −6,173 | 0.00% |
| Algert Global LLC | 38,307 | 0.08% | $66.27K | +15,126 | 0.00% |
| Morgan Stanley | 27,587 | 0.05% | $47.73K | −1,620 | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 34 | 18M | 34.9% | 5 / 9 | 13 / 16 | 4M | 2M |
| Q1 2026 | 46 | 16M | 31.6% | 13 / 17 | 9 / 8 | 3M | 1M |
| Q4 2025 | 42 | 15M | 29.1% | 15 / 11 | 8 / 2 | 1M | 1M |
| Q3 2025 | 29 | 15M | 29.6% | 4 / 9 | 7 / 4 | 0M | 1M |
| Q2 2025 | 29 | 15M | 30.2% | 3 / 11 | 8 / 2 | 0M | 0M |
| Q1 2025 | 28 | 15M | 30.5% | 13 / 8 | 4 / 4 | 4M | 0M |
| Q4 2024 | 19 | 12M | 23.8% | 2 / 6 | 3 / 1 | 0M | 1M |
| Q3 2024 | 19 | 18M | 35.6% | 3 / 2 | 6 / 4 | 1M | 1M |
| Q2 2024 | 21 | 19M | 38.0% | 1 / 5 | 7 / 3 | 0M | 1M |
| Q1 2024 | 23 | 20M | 39.3% | 1 / 6 | 7 / 4 | 0M | 1M |
| Q4 2023 | 26 | 21M | 41.6% | 5 / 7 | 4 / 2 | 0M | 1M |
| Q3 2023 | 23 | 21M | 42.8% | 1 / 4 | 8 / 2 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of RPID | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 750,984 | 1.50% | $1.30M | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 202,760 | 0.40% | $350.77K | 0.00% | Jun 30, 2026 |
| iShares Micro-Cap ETF | 112,127 | 0.22% | $193.98K | 0.01% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 107,845 | 0.22% | $216.77K | 0.00% | May 31, 2026 |
| Fidelity Total Market Index Fund | 31,525 | 0.06% | $63.37K | 0.00% | May 31, 2026 |
| Dimensional U.S. Small Cap ETF | 30,705 | 0.06% | $65.40K | 0.00% | Jul 31, 2026 |
| Fidelity Series Total Market Index Fund | 28,726 | 0.06% | $57.74K | 0.00% | May 31, 2026 |
| Fidelity Nasdaq Composite Index Fund | 26,152 | 0.05% | $52.57K | 0.00% | May 31, 2026 |
| U.S. Micro Cap Portfolio | 14,363 | 0.03% | $30.59K | 0.00% | Jul 31, 2026 |
| Vanguard Balanced Index Fund | 14,205 | 0.03% | $24.57K | 0.00% | Jun 30, 2026 |
| Vanguard Institutional Total Stock Market Index Fund | 14,085 | 0.03% | $24.37K | 0.00% | Jun 30, 2026 |
| Avantis U.S. Small Cap Equity ETF | 11,638 | 0.02% | $23.39K | 0.00% | May 31, 2026 |
| 1290 VT Micro Cap Portfolio | 7,524 | 0.02% | $13.02K | 0.01% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Robert G. Spignesi Jr. | PRESIDENT AND CEO, Director | 1,191,973 | 2.38% | Jul 24, 2026 |
| Sean M. Wirtjes | CHIEF FINANCIAL OFFICER | 568,981 | 1.13% | Jun 2, 2026 |
| John J. Addington Wilson | CHIEF OPERATING OFFICER | 316,762 | 0.63% | Mar 12, 2026 |
| Richard S. Kollender | Director | 1,613,008 | 3.22% | Jul 24, 2026 |
| Inese Lowenstein | Director | 70,687 | 0.14% | Jun 2, 2026 |
| Kirk Malloy | Director | 70,687 | 0.14% | Jun 2, 2026 |
| Melinda Litherland Pei | Director | 100,687 | 0.20% | Jun 2, 2026 |
| Dafni Bika | Director | 19,300 | 0.04% | May 26, 2026 |
| Natale S. Ricciardi | Director | 29,442 | 0.06% | Mar 2, 2026 |
| Bain Capital Life Sciences Partners, LP | 10% owner | – | – | May 22, 2026 |
| BCIP Life Sciences Associates, LP | 10% owner | – | – | May 22, 2026 |
| Bain Capital Life Sciences Fund, L.P. | 10% owner | 8,434,560 | 16.82% | May 22, 2026 |
| Bain Capital Life Sciences Investors, LLC | 10% owner | 6,999,998 | 13.96% | May 22, 2026 |
| Longitude Capital Partners II, LLC | 10% owner | – | – | Feb 6, 2026 |
| Patrick G. Enright | 10% owner | 63,914 | 0.13% | Feb 6, 2026 |
| Longitude Prime Partners, LLC | 10% owner | 49,000 | 0.10% | Feb 6, 2026 |
| Longitude Prime Fund, L.P. | 10% owner | – | – | Feb 6, 2026 |
| Longitude Venture Partners II, L.P. | 10% owner | 4,029,245 | 8.03% | Feb 6, 2026 |
| Bakker Juliet Tammenoms | 10% owner | – | – | Feb 6, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Richard S. Kollender Director | Jul 24, 2026 | Option exercise | +1,681 | $0.75 | $1.26K | 131,999 |
| Richard S. Kollender Director | Jul 24, 2026 | Option exercise | +1,827 | $0.75 | $1.37K | 133,826 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 22, 2026 | Option exercise | +1,402 | $0.75 | $1.05K | 1,191,973 |
| Melinda Litherland Pei Director | May 29, 2026 | Award | +12,787 | $1.96 | $25.06K | 100,687 |
| Inese Lowenstein Director | May 29, 2026 | Award | +12,787 | $1.96 | $25.06K | 70,687 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | May 29, 2026 | Award | +12,787 | $1.96 | $25.06K | 1,190,571 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | May 29, 2026 | Award | +12,787 | $1.96 | $25.06K | 568,981 |
| Kirk Malloy Director | May 29, 2026 | Award | +12,787 | $1.96 | $25.06K | 60,687 |
| Inese Lowenstein Director | May 21, 2026 | Award | +19,300 | – | – | 57,900 |
| Kirk Malloy Director | May 21, 2026 | Award | +19,300 | – | – | 47,900 |
| Richard S. Kollender Director | May 21, 2026 | Award | +19,300 | – | – | 130,318 |
| Melinda Litherland Pei Director | May 21, 2026 | Award | +19,300 | – | – | 87,900 |
| Dafni Bika Director | May 21, 2026 | Award | +19,300 | – | – | 19,300 |
| John J. Addington Wilson CHIEF OPERATING OFFICER | Mar 11, 2026 | Sale | −9,603 | $4.32 | $41.48K | 316,762 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | Mar 11, 2026 | Sale | −7,480 | $4.32 | $32.31K | 556,194 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Mar 10, 2026 | Sale | −17,922 | $4.11 | $73.66K | 1,169,848 |
| Natale S. Ricciardi Director | Feb 27, 2026 | Option exercise | +842 | $0.75 | $632 | 29,442 |
| John J. Addington Wilson CHIEF OPERATING OFFICER | Feb 20, 2026 | Sale | −5,403 | $3.92 | $21.18K | 326,365 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | Feb 20, 2026 | Sale | −17,254 | $3.92 | $67.64K | 563,674 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Feb 19, 2026 | Sale | −38,327 | $3.89 | $149.09K | 1,187,770 |
| John J. Addington Wilson CHIEF OPERATING OFFICER | Feb 11, 2026 | Award | +74,000 | – | – | 331,768 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Feb 11, 2026 | Award | +264,000 | – | – | 1,226,097 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | Feb 11, 2026 | Award | +97,000 | – | – | 580,928 |
| John J. Addington Wilson CHIEF OPERATING OFFICER | Feb 9, 2026 | Sale | −4,610 | $3.78 | $17.43K | 257,768 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Feb 9, 2026 | Sale | −12,840 | $3.78 | $48.54K | 962,097 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | Feb 9, 2026 | Sale | −6,027 | $3.78 | $22.78K | 483,928 |
| Longitude Venture Partners II, L.P. 10% owner | Feb 4, 2026 | Sale | −49,000 | $3.88 | $190.12K | 0 |
| Longitude Prime Partners, LLC 10% owner | Feb 3, 2026 | Sale | −27,500 | $4.24 | $116.60K | 49,000 |
| Longitude Prime Partners, LLC 10% owner | Feb 2, 2026 | Sale | −27,500 | $4.25 | $116.88K | 76,500 |
| Longitude Prime Partners, LLC 10% owner | Jan 30, 2026 | Sale | −46,000 | $4.54 | $208.84K | 104,000 |
| Longitude Prime Partners, LLC 10% owner | Jan 23, 2026 | Sale | −7,739 | $4.06 | $31.42K | 4,029,245 |
| Longitude Prime Partners, LLC 10% owner | Jan 23, 2026 | Option exercise | +629,032 | $0.05 | $31.45K | 4,036,984 |
| Kirk Malloy Director | Nov 14, 2025 | Gift | −40,000 | – | – | 28,600 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Oct 17, 2025 | Option exercise | +3,400 | $0.75 | $2.55K | 973,950 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Oct 17, 2025 | Tax withholding | −2,072 | $3.08 | $6.38K | 971,878 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Oct 17, 2025 | Option exercise | +7,833 | $0.75 | $5.87K | 979,711 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Oct 17, 2025 | Tax withholding | −4,774 | $3.08 | $14.70K | 974,937 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 14, 2025 | Sale | −11,881 | $3.32 | $39.44K | 970,550 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 14, 2025 | Option exercise | +25,145 | – | – | 982,431 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 11, 2025 | Sale | −11,874 | $3.33 | $39.54K | 957,286 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 11, 2025 | Option exercise | +25,145 | – | – | 969,160 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 10, 2025 | Sale | −11,617 | $3.40 | $39.50K | 944,015 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 10, 2025 | Option exercise | +25,145 | – | – | 925,728 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 9, 2025 | Option exercise | +25,144 | – | – | 911,830 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 9, 2025 | Sale | −11,247 | $3.51 | $39.48K | 900,583 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 8, 2025 | Option exercise | +25,144 | – | – | 897,510 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Jul 8, 2025 | Sale | −10,824 | $3.51 | $37.99K | 886,686 |
| Kirk Malloy Director | May 22, 2025 | Award | +14,300 | – | – | 78,600 |
| Inese Lowenstein Director | May 22, 2025 | Award | +14,300 | – | – | 38,600 |
| Richard S. Kollender Director | May 22, 2025 | Award | +14,300 | – | – | 111,018 |
| Melinda Litherland Pei Director | May 22, 2025 | Award | +14,300 | – | – | 68,600 |
| Natale S. Ricciardi Director | May 22, 2025 | Award | +14,300 | – | – | 28,600 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Mar 9, 2025 | Tax withholding | −10,650 | $2.39 | $25.45K | 872,366 |
| John J. Addington Wilson CHIEF OPERATING OFFICER | Mar 9, 2025 | Tax withholding | −9,872 | $2.39 | $23.59K | 232,474 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | Mar 9, 2025 | Tax withholding | −7,690 | $2.39 | $18.38K | 489,955 |
| John J. Addington Wilson CHIEF OPERATING OFFICER | Feb 18, 2025 | Award | +44,000 | – | – | 242,346 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Feb 18, 2025 | Award | +365,000 | – | – | 883,016 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | Feb 18, 2025 | Award | +160,000 | – | – | 497,645 |
| Sean M. Wirtjes CHIEF FINANCIAL OFFICER | Feb 11, 2025 | Tax withholding | −4,621 | $2.68 | $12.38K | 337,645 |
| Robert G. Spignesi Jr. PRESIDENT AND CEO, Director | Feb 11, 2025 | Tax withholding | −10,755 | $2.68 | $28.82K | 516,205 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| John J. Addington Wilson Former Officer | Jul 8, 2026 | 10,000 | $17.04K | Jul 8, 2026 | Stock Option Exercise |
| John J. Addington Wilson Former Officer | Jul 1, 2026 | 6,312 | $11.05K | Jul 1, 2026 | Stock Option Exercise |
| John J. Addington Wilson Former Officer | Jun 22, 2026 | 3,688 | $6.45K | Jun 22, 2026 | Stock Option Exercise |
| John J. Addington Wilson Former Officer | Jun 10, 2026 | 5,000 | $9.35K | Jun 10, 2026 | Stock Option Exercise |
| Sean M. Wirtjes Officer | Mar 11, 2026 | 7,480 | $32.30K | Mar 11, 2026 | Restricted Stock Vesting |
| John J. Addington Wilson Officer | Mar 11, 2026 | 9,603 | $41.47K | Mar 11, 2026 | Restricted Stock Vesting |
| Robert G. Spignesi Jr. Officer, Director | Mar 10, 2026 | 17,922 | $73.69K | Mar 10, 2026 | Restricted Stock Vesting |
| John J. Addington Wilson Officer | Feb 20, 2026 | 5,403 | $21.20K | Feb 20, 2026 | Restricted Stock Vesting |
| Sean M. Wirtjes Officer | Feb 20, 2026 | 17,254 | $67.69K | Feb 20, 2026 | Restricted Stock Vesting |
| Robert G. Spignesi Jr. Officer, Director | Feb 19, 2026 | 38,327 | $148.91K | Feb 19, 2026 | Restricted Stock Vesting |
| Robert G. Spignesi Jr. Officer, Director | Feb 9, 2026 | 12,840 | $48.57K | Feb 9, 2026 | Restricted Stock Vesting |
| John J. Addington Wilson Officer | Feb 9, 2026 | 4,610 | $17.44K | Feb 9, 2026 | Restricted Stock Vesting |
| Sean M. Wirtjes Officer | Feb 9, 2026 | 6,027 | $22.80K | Feb 9, 2026 | Restricted Stock Vesting |
| Robert G. Spignesi Jr. Officer, Director | Jul 14, 2025 | 11,881 | $39.48K | Jul 14, 2025 | Restricted Stock Vesting |
| Robert G. Spignesi Jr. Officer, Director | Jul 11, 2025 | 11,874 | $39.50K | Jul 11, 2025 | Restricted Stock Vesting |