MarketPeel
Insider Trading Intelligence
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Gary K. Lee

LYEL
CHIEF SCIENTIFIC OFFICER · LYELL IMMUNOPHARMA, INC. · CIK 0001907345
FILING MIX · LIFETIME60%/40%
BUYS
12
SELLS
8
TOTAL VALUE
$65.3K
COMPANIES
1
ACTIVE SINCE
Feb 2022
HOLDINGS NOW
17,808
AVG SELL PX
$17.15
TRADE KIND
SHOWING 20 / 20
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
4 backtested trades · 8 horizons · 10 pending
Forward-return performance of every backtestable P/S trade by Gary K. Lee, 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%+2.50%-0.59%+3.09%+1.57%
14d4+50.00%+8.08%-0.06%+8.14%+2.95%
30d4+25.00%+22.91%-0.68%+23.59%+13.37%
60d4+25.00%+26.14%+1.20%+24.94%+19.87%
90d4+50.00%+13.31%+4.90%+8.42%+1.92%
180d4(2 pending)+0.00%+73.82%+7.84%+65.98%+65.98%
1y4(4 pending)
2y4(4 pending)
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
LYEL · 17,808 shares · as of May 11, 2026
0200,000400,000600,000800,0002023202420252026SHARES 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 · 12 buys / 8 sellsCOVERAGE · 18 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
130$18.92$2.5K17,808May 11, 2026Jun 15, 2026View →
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
1,671$23.39$39.1K16,938Feb 11, 2026Feb 12, 2026View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
50,00050,000Feb 10, 2026Feb 11, 2026View →
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
147$23.12$3.4K18,609Feb 10, 2026Feb 11, 2026View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
4,00018,756Feb 9, 2026Feb 11, 2026View →
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
138$16.16$2.2K15,366Nov 10, 2025Nov 12, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
68,00068,000Oct 27, 2025Oct 29, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
1,453$10.54$15.3K15,504Aug 21, 2025Aug 22, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
8,00016,957Aug 20, 2025Aug 22, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
136$10.34$1.4K8,957Aug 12, 2025Aug 13, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
131$10.53$1.4K9,093Aug 11, 2025Aug 13, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
112,500176,696Feb 10, 2025Feb 26, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
56,25056,250Feb 10, 2025Feb 26, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
450,000450,000Feb 10, 2025Feb 26, 2025View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
40,00052,700Feb 9, 2024Feb 13, 2024View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
400,000400,000Feb 9, 2024Feb 13, 2024View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
800,000800,000Nov 16, 2023Nov 20, 2023View →
LYEL
LYELL IMMUNOPHARMA, INC.
SALE
Chief Scientific Officer
800,0000Nov 16, 2023Nov 20, 2023View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
600,000600,000Feb 24, 2023Feb 28, 2022View →
LYEL
LYELL IMMUNOPHARMA, INC.
PURCHASEGRANT
Stock grant
800,000800,000Feb 11, 2022Feb 14, 2022View →
Other insiders · LYEL
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About this filer
CIK 0001907345
ROLE
Chief Scientific Officer
PRIMARY
LYEL
COMPANIES
1
ACTIVE SINCE
Feb 2022
MARKETPEEL · /INSIDER/0001907345DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

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