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JB

James Bylund

RGEN
CHIEF OPERATING OFFICER · REPLIGEN CORP · CIK 0001849642
FILING MIX · LIFETIME44%/56%
BUYS
19
SELLS
24
TOTAL VALUE
$3.97M
COMPANIES
1
ACTIVE SINCE
Apr 2021
HOLDINGS NOW
8,315
AVG SELL PX
$173.61
TRADE KIND
SHOWING 43 / 43
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
4 backtested trades · 8 horizons · 2 pending
Forward-return performance of every backtestable P/S trade by James Bylund, 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
7d4+25.00%+5.53%+1.56%+3.97%+3.71%—
14d4+25.00%+3.52%+2.11%+1.41%+1.18%—
30d4+75.00%-6.25%+0.74%-7.00%-7.87%—
60d4+75.00%-9.48%-0.61%-8.87%-9.62%—
90d4+100.00%-13.50%+1.86%-15.36%-15.48%—
180d4+75.00%-11.03%+6.82%-17.84%-27.91%—
1y4(1 pending)+100.00%-20.66%+13.71%-34.37%-38.75%—
2y4(1 pending)+100.00%-28.22%+24.28%-52.49%-65.26%—
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
RGEN · 8,315 shares · as of Mar 5, 2026
06,35612,71219,06725,42320222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
FLOW · 19 buys / 24 sellsCOVERAGE · 20 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
7,751——25,423Mar 5, 2026Mar 23, 2026 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
8,315——8,315Mar 5, 2026Mar 23, 2026 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
62$125.84$7.8K17,672Mar 4, 2026Mar 5, 2026 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
125——17,734Mar 4, 2026Mar 5, 2026 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
2,433$124.97$304.1K17,609Mar 2, 2026Mar 3, 2026 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
1,478$128.73$190.3K20,042Feb 27, 2026Mar 3, 2026 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
2,191$151.21$331.3K21,520Nov 18, 2025Nov 19, 2025 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
454$128.50$58.3K23,711Apr 1, 2025Apr 2, 2025 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
175$142.44$24.9K24,165Mar 13, 2025Mar 20, 2025 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
381——24,340Mar 13, 2025Mar 20, 2025 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
6,435——25,198Mar 3, 2025Mar 4, 2025 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
1,239$155.38$192.5K23,959Mar 3, 2025Mar 4, 2025 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
6,056——6,056Mar 3, 2025Mar 4, 2025 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
1,285$156.54$201.2K18,763Feb 27, 2025Feb 28, 2025 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
543$164.74$89.5K20,048Feb 24, 2025Feb 25, 2025 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
444$182.95$81.2K20,591Apr 2, 2024Apr 4, 2024 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
1,206$195.72$236.0K21,035Mar 7, 2024Mar 7, 2024 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
22$195.52$4.3K22,241Mar 5, 2024Mar 6, 2024 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
197$193.99$38.2K22,263Mar 4, 2024Mar 6, 2024 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
820$191.79$157.3K22,410Mar 1, 2024Mar 4, 2024 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
50——22,460Mar 1, 2024Mar 5, 2024 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
404——23,230Feb 29, 2024Mar 4, 2024 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
8,691——22,826Feb 27, 2024Feb 29, 2024 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
8,632——8,632Feb 27, 2024Feb 29, 2024 ↗View →
RGEN
REPLIGEN CORP
PURCHASE
Chief Operating Officer
940$94.33$88.7K18,508Feb 23, 2024Feb 26, 2024 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
4,373$198.08$866.2K14,135Feb 23, 2024Feb 26, 2024 ↗View →
RGEN
REPLIGEN CORP
PURCHASE
Chief Operating Officer
940——4,000Feb 23, 2024Feb 26, 2024 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
334$163.45$54.6K17,568Apr 4, 2023Apr 4, 2023 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
210$188.00$39.5K17,902Mar 3, 2023Mar 6, 2023 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
625——18,112Mar 3, 2023Mar 6, 2023 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
8,644——8,644Mar 2, 2023Mar 6, 2023 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
8,348——17,487Mar 2, 2023Mar 6, 2023 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
594$173.44$103.0K9,139Feb 28, 2023Feb 28, 2023 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
2,000$240.40$480.8K9,733Aug 3, 2022Aug 4, 2022 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
2,000——8,000Aug 3, 2022Aug 4, 2022 ↗View →
RGEN
REPLIGEN CORP
PURCHASE
Chief Operating Officer
2,000$94.33$188.7K11,733Aug 3, 2022Aug 4, 2022 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
335$188.02$63.0K9,733Apr 1, 2022Apr 4, 2022 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
4,312——4,312Feb 24, 2022Feb 28, 2022 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
188$189.21$35.6K10,068Feb 24, 2022Feb 28, 2022 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
3,366——10,256Feb 24, 2022Feb 28, 2022 ↗View →
RGEN
REPLIGEN CORP
PURCHASEGRANT
Stock grant
900——7,224Feb 17, 2022Feb 22, 2022 ↗View →
RGEN
REPLIGEN CORP
SALE
Chief Operating Officer
334$182.42$60.9K6,890Feb 17, 2022Feb 22, 2022 ↗View →
RGEN
REPLIGEN CORP
SALE
SVP, Global Operations & IT
360$204.25$73.5K6,324Apr 6, 2021Apr 8, 2021 ↗View →
Other insiders · RGEN
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About this filer
CIK 0001849642
ROLE
Chief Operating Officer
PRIMARY
RGEN
COMPANIES
1
ACTIVE SINCE
Apr 2021
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