MarketPeel
Insider Trading Intelligence
SW

Sean M. Wirtjes

RPID
CHIEF FINANCIAL OFFICER · RAPID MICRO BIOSYSTEMS, INC. · CIK 0001289733
FILING MIX · LIFETIME62%/38%
BUYS
16
SELLS
10
TOTAL VALUE
$241.5K
COMPANIES
1
ACTIVE SINCE
Feb 2022
HOLDINGS NOW
12,787
AVG SELL PX
$2.91
TRADE KIND
SHOWING 26 / 26
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
5 backtested trades · 8 horizons · 10 pending
Forward-return performance of every backtestable P/S trade by Sean M. Wirtjes, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d5+60.00%-0.29%+0.12%-0.41%+6.67%
14d5+60.00%-1.29%-0.06%-1.23%+8.07%
30d5+80.00%-10.31%-1.25%-9.07%+7.15%
60d5+100.00%-20.13%+3.43%-23.55%-41.38%
90d5+100.00%-15.48%+7.51%-14.43%-13.83%
180d5(3 pending)+100.00%+96.74%+15.84%+80.91%+80.91%
1y5(3 pending)+50.00%+166.44%+23.97%+142.47%+142.47%
2y5(4 pending)+100.00%+178.83%+48.47%+130.36%+130.36%
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
RPID · 12,787 shares · as of May 29, 2026
0145,232290,464435,696580,9282023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 16 buys / 10 sellsCOVERAGE · 18 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
12,787$1.96$25.0K568,981May 29, 2026Jun 2, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
12,78712,787May 29, 2026Jun 2, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
12,78712,787May 29, 2026Jun 2, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
7,480$4.32$32.3K556,194Mar 11, 2026Mar 12, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
17,254$3.92$67.7K563,674Feb 20, 2026Feb 20, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
97,000580,928Feb 11, 2026Feb 13, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
193,000193,000Feb 11, 2026Feb 13, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
6,027$3.78$22.8K483,928Feb 9, 2026Feb 10, 2026View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
7,690$2.39$18.4K489,955Mar 9, 2025Mar 11, 2025View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
160,000497,645Feb 18, 2025Feb 20, 2025View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
121,000121,000Feb 18, 2025Feb 20, 2025View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
4,621$2.68$12.4K337,645Feb 11, 2025Feb 13, 2025View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
5,891$3.10$18.3K342,266Feb 6, 2025Feb 7, 2025View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASE
CHIEF FINANCIAL OFFICER
10,000$0.78$7.8K348,157Aug 7, 2024Aug 8, 2024View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
7,454$0.98$7.3K325,403Mar 11, 2024Mar 12, 2024View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
CHIEF FINANCIAL OFFICER
3,794$0.96$3.6K332,857Feb 12, 2024Feb 14, 2024View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
103,000103,000Feb 6, 2024Feb 8, 2024View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
51,000336,651Feb 6, 2024Feb 8, 2024View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASE
CHIEF FINANCIAL OFFICER
10,000$0.99$9.9K285,651Sep 6, 2023Sep 8, 2023View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
78,600268,912Mar 9, 2023Mar 13, 2023View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
198,600198,600Mar 9, 2023Mar 13, 2023View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
Chief Financial Officer
4,621$1.30$6.0K190,312Feb 13, 2023Feb 15, 2023View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASE
Chief Financial Officer
10,000$1.00$10.0K191,631Mar 17, 2022Mar 21, 2022View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
SALE
Chief Financial Officer
10,00082,886Mar 17, 2022Mar 21, 2022View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
80,00080,000Feb 11, 2022Feb 15, 2022View →
RPID
RAPID MICRO BIOSYSTEMS, INC.
PURCHASEGRANT
Stock grant
40,000181,631Feb 11, 2022Feb 15, 2022View →
Other insiders · RPID
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About this filer
CIK 0001289733
ROLE
CHIEF FINANCIAL OFFICER
PRIMARY
RPID
COMPANIES
1
ACTIVE SINCE
Feb 2022
MARKETPEEL · /INSIDER/0001289733DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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