RAPID MICRO BIOSYSTEMS, INC.
RPID · Laboratory Analytical Instruments · 43.6M shares · +232%/yr ↑ dilution · EDGAR filings ↗
Reference price $4.32 · est. market cap ~$188M — last insider sale, 2026-03-11 (estimated from the dated SEC Form 4 price × shares outstanding — not a live quote)
Grade
D46Microbial-detection tools company with deep losses but growth, funded.
Strengths
- Strong growth — revenue +20% (90th)
- Adequate liquidity — current ratio 3.3 (52nd)
Risks
- Deep losses — operating margin -141%, ROE -142%
- Cash burn — FCF -$32M
- Adoption/scaling execution — per 10-K
Notable findings
- Exec changeRecent 8-K item 5.02 8-K ↗
- Net lossNet loss (net margin -140.3%)
- Cash burnNegative free cash flow (-31.9M)
- Fund exitedNotable fund(s) exited this quarter: VANGUARD GROUP INC, CITADEL ADVISORS LLC
- Chronic dilutionShare count +232%/yr over 4y (dilution, book value/share -100%)
- Notable holderHeld by 3 notable fund(s): RENAISSANCE TECHNOLOGIES LLC, STATE STREET CORP, GOLDMAN SACHS GROUP INC (as of 2026-03-31)
- Insider sellingInsider selling — 14 open-market sale(s) by 4 insider(s) (cluster of 4 insiders, ~$1M, last 6mo) Form 4 ↗
- Revenue declineRevenue -29.1% YoY
Quarterly revenue
Last 4 quarters · from SEC filings.
Key metrics
Operating margin
-141.1%
Net margin
-140.3%
Return on equity
-141.9%
Return on assets
-63.0%
ROIC
-71.9%
Revenue growth (QoQ)
-29.1%
Debt / equity
0.6×
Current ratio
3.3×
Free cash flow
-$32M
EBITDA
-$44M
Tangible book value
$33M
Cash & investments
$38M
Cash runway
5q
Stock comp / revenue
12.0%
Insider transactions · last 18 months
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| 2026-05-29 | Spignesi Robert G. Jr. | Grant | 13K | $1.96 |
| 2026-05-29 | PEI MELINDA LITHERLAND | Grant | 13K | $1.96 |
| 2026-05-29 | Malloy Kirk | Grant | 13K | $1.96 |
| 2026-05-29 | LOWENSTEIN INESE | Grant | 13K | $1.96 |
| 2026-05-29 | WIRTJES SEAN M | Grant | 13K | $1.96 |
| 2026-05-21 | Kollender Richard S | Grant | 19K | — |
| 2026-05-21 | Bika Dafni | Grant | 19K | — |
| 2026-05-21 | LOWENSTEIN INESE | Grant | 19K | — |
| 2026-05-21 | PEI MELINDA LITHERLAND | Grant | 19K | — |
| 2026-05-21 | Malloy Kirk | Grant | 19K | — |
| 2026-03-11 | Wilson John J. Addington | Sell | 9.6K | $4.32 |
| 2026-03-11 | WIRTJES SEAN M | Sell | 7.5K | $4.32 |
| 2026-03-10 | Spignesi Robert G. Jr. | Sell | 18K | $4.11 |
| 2026-02-27 | RICCIARDI NATALE S | Option exercise | 842 | $0.75 |
| 2026-02-20 | Wilson John J. Addington | Sell | 5.4K | $3.92 |
| 2026-02-20 | WIRTJES SEAN M | Sell | 17K | $3.92 |
| 2026-02-19 | Spignesi Robert G. Jr. | Sell | 38K | $3.89 |
| 2026-02-11 | Wilson John J. Addington | Grant | 74K | — |
| 2026-02-11 | WIRTJES SEAN M | Grant | 97K | — |
| 2026-02-11 | Spignesi Robert G. Jr. | Grant | 264K | — |
| 2026-02-09 | Wilson John J. Addington | Sell | 4.6K | $3.78 |
| 2026-02-09 | Spignesi Robert G. Jr. | Sell | 13K | $3.78 |
| 2026-02-09 | WIRTJES SEAN M | Sell | 6.0K | $3.78 |
| 2026-02-04 | Longitude Capital Partners II, LLC | Sell | 49K | $3.88 |
| 2026-02-03 | Longitude Capital Partners II, LLC | Sell | 28K | $4.24 |
| 2026-02-02 | Longitude Capital Partners II, LLC | Sell | 28K | $4.25 |
| 2026-01-30 | Longitude Capital Partners II, LLC | Sell | 46K | $4.54 |
| 2026-01-23 | Longitude Capital Partners II, LLC | Option exercise | 629K | $0.05 |
| 2026-01-23 | Longitude Capital Partners II, LLC | Sell | 7.7K | $4.06 |
| 2025-11-14 | Malloy Kirk | Gift | 40K | — |
| 2025-10-17 | Spignesi Robert G. Jr. | Option exercise | 3.4K | $0.75 |
| 2025-10-17 | Spignesi Robert G. Jr. | Tax withheld | 2.1K | $3.08 |
| 2025-10-17 | Spignesi Robert G. Jr. | Option exercise | 7.8K | $0.75 |
| 2025-10-17 | Spignesi Robert G. Jr. | Tax withheld | 4.8K | $3.08 |
| 2025-07-14 | Spignesi Robert G. Jr. | Option exercise | 25K | — |
| 2025-07-14 | Spignesi Robert G. Jr. | Sell | 12K | $3.32 |
| 2025-07-11 | Spignesi Robert G. Jr. | Sell | 12K | $3.33 |
| 2025-07-11 | Spignesi Robert G. Jr. | Option exercise | 25K | — |
| 2025-07-10 | Spignesi Robert G. Jr. | Sell | 12K | $3.40 |
| 2025-07-10 | Spignesi Robert G. Jr. | Option exercise | 25K | — |
| 2025-07-09 | Spignesi Robert G. Jr. | Option exercise | 25K | — |
| 2025-07-09 | Spignesi Robert G. Jr. | Sell | 11K | $3.51 |
| 2025-07-08 | Spignesi Robert G. Jr. | Option exercise | 25K | — |
| 2025-07-08 | Spignesi Robert G. Jr. | Sell | 11K | $3.51 |
| 2025-05-22 | Malloy Kirk | Grant | 14K | — |
| 2025-05-22 | LOWENSTEIN INESE | Grant | 14K | — |
| 2025-05-22 | PEI MELINDA LITHERLAND | Grant | 14K | — |
| 2025-05-22 | Kollender Richard S | Grant | 14K | — |
| 2025-05-22 | RICCIARDI NATALE S | Grant | 14K | — |
| 2025-03-09 | Spignesi Robert G. Jr. | Tax withheld | 11K | $2.39 |
| 2025-03-09 | WIRTJES SEAN M | Tax withheld | 7.7K | $2.39 |
| 2025-03-09 | Wilson John J. Addington | Tax withheld | 9.9K | $2.39 |
| 2025-02-18 | Wilson John J. Addington | Grant | 44K | — |
| 2025-02-18 | WIRTJES SEAN M | Grant | 160K | — |
| 2025-02-18 | Spignesi Robert G. Jr. | Grant | 365K | — |
| 2025-02-11 | Wilson John J. Addington | Tax withheld | 7.1K | $2.68 |
| 2025-02-11 | WIRTJES SEAN M | Tax withheld | 4.6K | $2.68 |
| 2025-02-11 | Spignesi Robert G. Jr. | Tax withheld | 11K | $2.68 |
| 2025-02-06 | Wilson John J. Addington | Tax withheld | 4.5K | $3.10 |
| 2025-02-06 | WIRTJES SEAN M | Tax withheld | 5.9K | $3.10 |
| 2025-02-06 | Spignesi Robert G. Jr. | Tax withheld | 13K | $3.10 |
All non-derivative Form 4 activity (SEC), newest first.
Notable events (8-K)
| Date | Items | |
|---|---|---|
| 2026-05-28 | Shareholder vote | filing ↗ |
| 2026-05-19 | Material agreementExhibits | filing ↗ |
| 2026-05-13 | ResultsExhibits | filing ↗ |
| 2026-03-27 | Exec/director changeExhibits | filing ↗ |
| 2026-03-12 | ResultsReg FDExhibits | filing ↗ |
| 2026-01-13 | ResultsExhibits | filing ↗ |
| 2025-11-07 | ResultsExhibits | filing ↗ |
| 2025-08-12 | Material agreementResultsDebt obligation3.02Reg FDExhibits | filing ↗ |
Recent filings
| Form | Filed | Period | Accession |
|---|---|---|---|
| 8-K | 2026-05-28 | 2026-05-21 | 0001380106-26-000085 ↗ |
| 8-K | 2026-05-19 | 2026-05-18 | 0001104659-26-063936 ↗ |
| 10-Q | 2026-05-15 | 2026-03-31 | 0001380106-26-000075 ↗ |
| 8-K | 2026-05-13 | 2026-05-13 | 0001380106-26-000067 ↗ |
| 8-K | 2026-03-27 | 2026-03-23 | 0001380106-26-000045 ↗ |
| 8-K | 2026-03-12 | 2026-03-12 | 0001380106-26-000029 ↗ |
| 10-K | 2026-03-12 | 2025-12-31 | 0001380106-26-000034 ↗ |
| 8-K | 2026-01-13 | 2026-01-13 | 0001380106-26-000007 ↗ |
| 8-K | 2025-11-07 | 2025-11-07 | 0001380106-25-000195 ↗ |
| 10-Q | 2025-11-07 | 2025-09-30 | 0001380106-25-000200 ↗ |
| 8-K | 2025-08-12 | 2025-08-08 | 0001380106-25-000169 ↗ |
| 10-Q | 2025-08-12 | 2025-06-30 | 0001380106-25-000174 ↗ |