MarketPeel
Insider Trading Intelligence
GC

Gregory K. Chow

STRO
CFO · SUTRO BIOPHARMA, INC. · CIK 0001761333
FILING MIX · LIFETIME88%/12%
BUYS
7
SELLS
1
TOTAL VALUE
$16.0K
COMPANIES
1
ACTIVE SINCE
Jun 2025
HOLDINGS NOW
7,500
AVG SELL PX
TRADE KIND
SHOWING 8 / 8
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
1 backtested trades · 8 horizons · 2 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Gregory K. Chow, 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
7d1+100.00%+48.72%+0.40%+48.32%+48.32%
14d1+100.00%+34.62%+3.34%+31.27%+31.27%
30d1+100.00%+15.38%+1.02%+14.37%+14.37%
60d1+100.00%+27.31%+2.34%+24.97%+24.97%
90d1+100.00%+36.28%+4.30%+31.98%+31.98%
180d1+100.00%+235.77%+3.15%+232.62%+232.62%
1y1(1 pending)
2y1(1 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
STRO · 7,500 shares · as of Jun 2, 2026
068,750137,500206,250275,0002026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2025
2025
2025
2026
2026
FLOW · 7 buys / 1 sellsCOVERAGE · 5 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CFO
2,5004,725Jun 2, 2026Jun 2, 2026View →
STRO
SUTRO BIOPHARMA, INC.
SALE
CFO
2,5007,500Jun 2, 2026Jun 2, 2026View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
40,00040,000Mar 2, 2026Mar 3, 2026View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
5,0005,000Mar 2, 2026Mar 3, 2026View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
8,2008,200Dec 23, 2025Dec 29, 2025View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASE
CFO
19,750$0.81$16.0K19,750Oct 15, 2025Oct 16, 2025View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
100,000100,000Jun 2, 2025Jun 2, 2025View →
STRO
SUTRO BIOPHARMA, INC.
PURCHASEGRANT
Stock grant
275,000275,000Jun 2, 2025Jun 2, 2025View →
Other insiders · STRO
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About this filer
CIK 0001761333
ROLE
CFO
PRIMARY
STRO
COMPANIES
1
ACTIVE SINCE
Jun 2025
MARKETPEEL · /INSIDER/0001761333DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

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