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WN

William J. Newell

STRO
CEO · SUTRO BIOPHARMA, INC. · CIK 0001309660
FILING MIX · LIFETIME51%/49%
BUYS
33
SELLS
32
TOTAL VALUE
$1.62M
COMPANIES
2
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
365,923
AVG SELL PX
$7.09
TRADE KIND
SHOWING 65 / 65
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
2 backtested trades · 8 horizonsHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by William J. Newell, 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
7d2+100.00%+9.56%+5.19%+4.38%+4.38%—
14d2+100.00%+12.17%+7.99%+4.18%+4.18%—
30d2+100.00%+5.51%+6.70%-1.19%-1.19%—
60d2+50.00%-18.29%+3.80%-22.09%-22.09%—
90d2+50.00%-22.27%+4.57%-26.84%-26.84%—
180d2+50.00%+33.35%+11.76%+21.59%+21.59%—
1y2+50.00%+56.15%+22.00%+34.15%+34.15%—
2y2+0.00%-42.47%+36.39%-78.86%-78.86%—
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
STRO · 299,239 shares · as of Mar 5, 2025
074,810149,620224,429299,23920212022202320242025SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
FLOW · 33 buys / 32 sellsCOVERAGE · 21 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
6,708$1.36$9.1K292,531Mar 5, 2025Mar 7, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
18,750——0Mar 5, 2025Mar 7, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
18,750——299,239Mar 5, 2025Mar 7, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
31,125——31,125Mar 4, 2025Mar 6, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
31,125——291,625Mar 4, 2025Mar 6, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
11,136$1.42$15.8K280,489Mar 4, 2025Mar 6, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
23,750——243,953Mar 1, 2025Mar 4, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
41,750——125,250Mar 1, 2025Mar 4, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
41,750——285,703Mar 1, 2025Mar 4, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
23,750——47,500Mar 1, 2025Mar 4, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
25,203$1.59$40.1K260,500Mar 1, 2025Mar 4, 2025 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
174,000——174,000Mar 5, 2024Mar 7, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
18,750——226,893Mar 5, 2024Mar 7, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
130,500——130,500Mar 5, 2024Mar 7, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
18,750——18,750Mar 5, 2024Mar 7, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
6,690$4.54$30.4K220,203Mar 5, 2024Mar 7, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
167,000——167,000Mar 5, 2024Mar 22, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
31,125——62,250Mar 4, 2024Mar 6, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
31,125——219,248Mar 4, 2024Mar 6, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
11,105$4.79$53.2K208,143Mar 4, 2024Mar 6, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
23,750——71,250Mar 1, 2024Mar 5, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
23,750——196,682Mar 1, 2024Mar 5, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
8,559$4.95$42.4K188,123Mar 1, 2024Mar 5, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
13,750——0Jan 29, 2024Jan 31, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
13,750——178,566Jan 29, 2024Jan 31, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
5,634$4.99$28.1K172,932Jan 29, 2024Jan 31, 2024 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
95,000——95,000Mar 3, 2023Mar 7, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
17,246$5.79$99.9K164,816Mar 3, 2023Mar 7, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
31,125——93,375Mar 3, 2023Mar 7, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
31,125——163,312Mar 3, 2023Mar 7, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
18,750——182,062Mar 3, 2023Mar 7, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
18,750——37,500Mar 3, 2023Mar 7, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
125,000——125,000Mar 3, 2023Mar 7, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
13,750——137,787Jan 27, 2023Jan 31, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
5,600$7.50$42.0K132,187Jan 27, 2023Jan 31, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
13,750——13,750Jan 27, 2023Jan 31, 2023 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
10,000$7.75$77.5K116,525Mar 14, 2022Mar 15, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
18,750——56,250Mar 5, 2022Mar 7, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
18,750——119,943Mar 5, 2022Mar 7, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
6,483$8.17$53.0K113,460Mar 5, 2022Mar 7, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
166,000——166,000Mar 4, 2022Mar 7, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
124,500——124,500Mar 4, 2022Mar 7, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
13,750——106,471Jan 29, 2022Feb 1, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
5,278$10.39$54.8K101,193Jan 29, 2022Feb 1, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
13,750——27,500Jan 29, 2022Feb 1, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
1,863——106,525Dec 30, 2021Jan 3, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
26,091——0Dec 30, 2021Jan 3, 2022 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
13,219$19.23$254.2K92,721Sep 24, 2021Sep 28, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
25,253——0Sep 24, 2021Sep 28, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
25,253——105,940Sep 24, 2021Sep 28, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Gift
104,662——104,662Jul 1, 2021Sep 28, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALEGRANT
Gift
104,662——80,687Jul 1, 2021Sep 28, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
75,000——75,000Mar 5, 2021Mar 8, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
200,000——200,000Mar 5, 2021Mar 8, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
7,061$22.15$156.4K185,349Jan 29, 2021Feb 1, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
13,750——41,250Jan 29, 2021Feb 1, 2021 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
13,750——192,410Jan 29, 2021Feb 1, 2021 ↗View →
PCVX
VAXCYTE, INC.
PURCHASEGRANT
Stock grant
22,228$1.29$28.7K66,684Dec 9, 2020Dec 10, 2020 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
25,252——25,253Sep 25, 2020Sep 28, 2020 ↗View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CEO
13,219$10.30$136.2K178,660Sep 25, 2020Sep 28, 2020 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
25,252——191,879Sep 25, 2020Sep 28, 2020 ↗View →
PCVX
VAXCYTE, INC.
PURCHASEGRANT
Stock grant
40,000——40,000Jun 11, 2020Jun 15, 2020 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CEO
64,516$7.75$500.0K166,627May 14, 2020May 14, 2020 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
125,000——125,000Jan 29, 2020Jan 31, 2020 ↗View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
55,000——55,000Jan 29, 2020Jan 31, 2020 ↗View →
Other insiders · STRO
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About this filer
CIK 0001309660
ROLE
CEO
PRIMARY
STRO
COMPANIES
2
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001309660DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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