MarketPeel
Insider Trading Intelligence
SZ

Shuo Zhang

PDFS
DIRECTOR · PDF SOLUTIONS INC · CIK 0001782026
FILING MIX · LIFETIME64%/36%
BUYS
7
SELLS
4
TOTAL VALUE
$634.1K
COMPANIES
1
ACTIVE SINCE
Aug 2020
HOLDINGS NOW
24,881
AVG SELL PX
$29.40
TRADE KIND
SHOWING 11 / 11
Trades · vs SPY
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Performance · forward returns vs SPY
4 backtested trades · 8 horizonsHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Shuo Zhang, 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%+2.62%+2.47%+0.15%-0.03%
14d4+25.00%+5.74%+4.69%+1.05%+2.55%
30d4+75.00%-3.54%+1.81%-5.34%-4.30%
60d4+75.00%-7.26%-0.67%-6.59%-5.47%
90d4+75.00%-6.89%+0.94%-7.83%-10.24%
180d4+25.00%+2.89%+8.11%-5.22%-4.47%
1y4+50.00%-0.63%+12.90%-13.54%-24.16%
2y4+50.00%+7.37%+42.67%-46.35%-53.12%
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
PDFS · 24,881 shares · as of Jul 1, 2026
06,22012,44118,66124,881202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
FLOW · 7 buys / 4 sellsCOVERAGE · 25 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
2,68924,881Jul 1, 2026Jul 2, 2026View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
7,42922,192Jul 1, 2025Jul 2, 2025View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
4,38214,763Jul 1, 2024Jul 2, 2024View →
PDFS
PDF SOLUTIONS INC
SALE
5,500$34.66$190.6K10,381Jun 3, 2024Jun 4, 2024View →
PDFS
PDF SOLUTIONS INC
SALE
3,047$33.75$102.8K15,881Aug 18, 2023Aug 21, 2023View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
3,35418,928Jul 1, 2023Jul 5, 2023View →
PDFS
PDF SOLUTIONS INC
SALE
2,000$29.84$59.7K15,574Nov 16, 2022Nov 17, 2022View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
7,21217,574Jul 1, 2022Jul 5, 2022View →
PDFS
PDF SOLUTIONS INC
SALE
11,017$25.50$280.9K10,362Mar 15, 2022Mar 17, 2022View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
4,68821,379Jul 1, 2021Jul 2, 2021View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
4,68816,691Aug 1, 2020Aug 4, 2020View →
Other insiders · PDFS
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About this filer
CIK 0001782026
ROLE
Director
PRIMARY
PDFS
COMPANIES
1
ACTIVE SINCE
Aug 2020
MARKETPEEL · /INSIDER/0001782026DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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