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SM

Stephen Mayo

SRPT
DIRECTOR · SAREPTA THERAPEUTICS, INC. · CIK 0001849061
FILING MIX · LIFETIME86%/14%
BUYS
24
SELLS
4
TOTAL VALUE
$1.95M
COMPANIES
3
ACTIVE SINCE
Mar 2021
HOLDINGS NOW
177,865
AVG SELL PX
$30.42
TRADE KIND
SHOWING 28 / 28
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
4 backtested trades · 8 horizons · 3 pending
Forward-return performance of every backtestable P/S trade by Stephen Mayo, 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+75.00%-0.36%+0.61%-0.98%-1.80%—
14d4+25.00%+7.96%-0.09%+8.04%+3.75%—
30d4+25.00%+8.94%+0.04%+8.90%+7.81%—
60d4+25.00%+3.04%+2.28%+0.76%+5.26%—
90d4+50.00%-4.46%+4.39%-8.85%-10.34%—
180d4(1 pending)+33.33%+13.82%+9.10%+4.72%-1.32%—
1y4(1 pending)+100.00%-25.58%+16.68%-42.26%-40.52%—
2y4(1 pending)+100.00%-55.59%+44.38%-99.97%-118.77%—
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
SRPT · 18,640 shares · as of Jun 4, 2026
04,6609,32013,98018,64020222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 24 buys / 4 sellsCOVERAGE · 22 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
ALLO
ALLOGENE THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
144,400——144,400Jun 18, 2026Jun 23, 2026 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
16,875——18,640Jun 4, 2026Jun 5, 2026 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
1,853.1$118.72$220.0K14,824.52May 29, 2026Jun 2, 2026 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
SALE
7,239$17.02$123.2K1,765Mar 12, 2026Mar 13, 2026 ↗View →
ALLO
ALLOGENE THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
95,400——95,400Jun 18, 2025Jun 20, 2025 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
2,863.092$76.84$220.0K12,539.833May 30, 2025Jun 3, 2025 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
2,383——9,004Mar 10, 2025Mar 11, 2025 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
4,792——4,792Mar 10, 2025Mar 11, 2025 ↗View →
ALLO
ALLOGENE THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
191,082——191,082Jun 5, 2024Jun 7, 2024 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
1,752.43$125.54$220.0K9,379.704May 31, 2024Jun 4, 2024 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
SALE
3,135$122.96$385.5K6,621Mar 5, 2024Mar 6, 2024 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
1,846——9,756Mar 1, 2024Mar 5, 2024 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
3,679——3,679Mar 1, 2024Mar 5, 2024 ↗View →
ALLO
ALLOGENE THERAPEUTICS, INC.
SALE
10,000$4.29$42.9K25,328Aug 7, 2023Aug 9, 2023 ↗View →
ALLO
ALLOGENE THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
116,120——116,120Jun 13, 2023Jun 15, 2023 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
1,980.733$111.07$220.0K7,430.36May 26, 2023May 31, 2023 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
3,257——3,257Mar 6, 2023Mar 8, 2023 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
1,523——7,910Mar 6, 2023Mar 8, 2023 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
SALE
858$109.92$94.3K6,387Nov 17, 2022Nov 21, 2022 ↗View →
ALLO
ALLOGENE THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
35,328——35,328Jul 8, 2022Jul 12, 2022 ↗View →
ALLO
ALLOGENE THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
54,487——54,487Jul 8, 2022Jul 12, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
2,363.558$93.08$220.0K5,297.517May 27, 2022Jun 1, 2022 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
2,953——7,245Mar 7, 2022Mar 9, 2022 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
5,077——5,077Mar 7, 2022Mar 9, 2022 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
8,238——8,238Nov 16, 2021Nov 17, 2021 ↗View →
SRPT
SAREPTA THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
4,292——4,292Nov 16, 2021Nov 17, 2021 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
2,635.393$75.89$200.0K2,755.291May 28, 2021Jun 2, 2021 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
119.898$76.23$9.1K119.898Mar 15, 2021Mar 17, 2021 ↗View →
Other insiders · SRPT
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About this filer
CIK 0001849061
ROLE
Director
PRIMARY
SRPT
COMPANIES
3
ACTIVE SINCE
Mar 2021
MARKETPEEL · /INSIDER/0001849061DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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