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JD

John D. Diekman

IDYA
10% OWNER · IDEAYA BIOSCIENCES, INC. · CIK 0001240357
FILING MIX · LIFETIME24%/76%
BUYS
8
SELLS
25
TOTAL VALUE
$56.05M
COMPANIES
4
ACTIVE SINCE
May 2020
HOLDINGS NOW
3,905,129
AVG SELL PX
$18.43
TRADE KIND
SHOWING 33 / 33
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
27 backtested trades · 8 horizons · 14 pending
Forward-return performance of every backtestable P/S trade by John D. Diekman, 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
7d27+59.26%-3.31%+1.07%-4.37%-0.89%—
14d27+48.15%-0.78%+1.46%-2.24%+0.85%—
30d27+62.96%+6.68%+3.26%+3.43%-8.21%—
60d27+74.07%-4.51%+6.57%-11.08%-17.95%—
90d27+85.19%-14.50%+7.20%-21.70%-27.34%—
180d27+77.78%-31.88%+10.27%-42.15%-53.75%—
1y27(4 pending)+78.26%-41.42%+22.96%-64.38%-52.65%—
2y27(10 pending)+70.59%-66.62%+20.85%-87.46%-118.29%—
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
IDYA · 2,187,428 shares · as of Nov 11, 2020
0546,8571,093,7141,640,5712,187,428SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 8 buys / 25 sellsCOVERAGE · 25 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
ZLAB
ZAI LAB LTD
PURCHASEGRANT
Stock grant
22,371——122,140Jun 17, 2026Jun 22, 2026 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
6,470$3.42$22.1K57,493Aug 22, 2025Aug 22, 2025 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
163,979$3.42$560.8K1,457,064Aug 22, 2025Aug 22, 2025 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
58,642$3.57$209.4K1,621,043Aug 21, 2025Aug 22, 2025 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
2,314$3.57$8.3K63,963Aug 21, 2025Aug 22, 2025 ↗View →
ZLAB
ZAI LAB LTD
PURCHASEGRANT
Stock grant
10,831——99,769Jun 18, 2025Jun 23, 2025 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
79$6.06$47966,277Sep 13, 2024Sep 13, 2024 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
2,000$6.06$12.1K1,679,685Sep 13, 2024Sep 13, 2024 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
11,758$6.06$71.3K8,167,206Sep 13, 2024Sep 13, 2024 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
1,440$6.60$9.5K66,356Sep 11, 2024Sep 13, 2024 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
36,504$6.60$240.9K1,681,685Sep 11, 2024Sep 13, 2024 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
SALE
214,556$6.60$1.42M8,178,964Sep 11, 2024Sep 13, 2024 ↗View →
ZLAB
ZAI LAB LTD
PURCHASEGRANT
Stock grant
21,253——88,938Jun 18, 2024Jun 20, 2024 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
PURCHASE
450,000$10.00$4.50M8,393,520Mar 13, 2024Mar 15, 2024 ↗View →
SKYE
SKYE BIOSCIENCE, INC.
PURCHASE
5,206,074$2.31$12.03M7,943,520Jan 31, 2024Feb 2, 2024 ↗View →
ZLAB
ZAI LAB LTD
PURCHASEGRANT
Stock grant
18,903$26.45$500.0K86,518Jun 29, 2023Jun 30, 2023 ↗View →
ZLAB
ZAI LAB LTD
SALE
1,000$50.17$50.2K67,615Feb 4, 2022Feb 7, 2022 ↗View →
ZLAB
ZAI LAB LTD
PURCHASEGRANT
Stock grant
7,763——68,615Jan 3, 2022Jan 4, 2022 ↗View →
ZLAB
ZAI LAB LTD
SALE
1,000$91.65$91.7K60,852Nov 5, 2021Nov 8, 2021 ↗View →
ZLAB
ZAI LAB LTD
SALE
1,000$149.50$149.5K61,852Aug 5, 2021Aug 5, 2021 ↗View →
ZLAB
ZAI LAB LTD
SALE
1,000$153.62$153.6K62,852May 5, 2021May 6, 2021 ↗View →
ZLAB
ZAI LAB LTD
PURCHASEGRANT
Stock grant
3,852——63,852Jan 15, 2021Jan 20, 2021 ↗View →
IDYA
IDEAYA BIOSCIENCES, INC.
SALE
115,504$13.66$1.58M384,496Nov 11, 2020Nov 13, 2020 ↗View →
IDYA
IDEAYA BIOSCIENCES, INC.
SALE
27,379$13.66$374.0K91,142Nov 11, 2020Nov 13, 2020 ↗View →
IDYA
IDEAYA BIOSCIENCES, INC.
SALE
657,117$13.66$8.98M2,187,428Nov 11, 2020Nov 13, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
175,000$25.30$4.43M138,497Oct 5, 2020Oct 7, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
4,807$33.30$160.1K75,965Jun 16, 2020Jun 18, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
115,357$33.30$3.84M1,823,192Jun 16, 2020Jun 18, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
19,836$33.30$660.5K313,497Jun 16, 2020Jun 18, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
235,200$28.75$6.76M1,938,549Jun 11, 2020Jun 15, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
9,800$28.75$281.8K80,772Jun 11, 2020Jun 15, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
244,800$35.15$8.60M2,173,748May 19, 2020May 21, 2020 ↗View →
APRE
APREA THERAPEUTICS, INC.
SALE
10,200$35.15$358.5K90,572May 19, 2020May 21, 2020 ↗View →
Other insiders · IDYA
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About this filer
CIK 0001240357
ROLE
10% Owner
PRIMARY
IDYA
COMPANIES
4
ACTIVE SINCE
May 2020
MARKETPEEL · /INSIDER/0001240357DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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