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Insider Trading Intelligence
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MG

Michael B. Gustafson

PDFS
DIRECTOR · PDF SOLUTIONS INC · CIK 0001245081
FILING MIX · LIFETIME46%/54%
BUYS
13
SELLS
15
TOTAL VALUE
$1.68M
COMPANIES
2
ACTIVE SINCE
May 2020
HOLDINGS NOW
83,330
AVG SELL PX
$18.11
TRADE KIND
SHOWING 28 / 28
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
15 backtested trades · 8 horizons · 2 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Michael B. Gustafson, 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
7d15+13.33%+1.98%-0.69%+2.67%+0.40%—
14d15+53.33%-3.21%-3.29%+0.09%+0.88%—
30d15+86.67%-8.57%-3.82%-4.75%-4.12%—
60d15+66.67%-14.41%-4.07%-10.34%-14.65%—
90d15+53.33%-6.23%-0.42%-5.81%-5.40%—
180d15+66.67%-2.38%+2.21%-4.59%-2.76%—
1y15+46.67%+19.39%+10.64%+8.74%+19.28%—
2y15(2 pending)+84.62%-18.33%+35.04%-53.36%-57.66%—
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 · 40,192 shares · as of Jul 1, 2026
010,04820,09630,14440,192202120222023202420252026SHARES 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
2026
FLOW · 13 buys / 15 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
2,689——40,192Jul 1, 2026Jul 2, 2026 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
7,429——37,503Jul 1, 2025Jul 2, 2025 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASE
7,500$19.45$145.9K30,074May 13, 2025May 14, 2025 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASE
4,000$23.06$92.2K22,574Feb 24, 2025Feb 25, 2025 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
4,382——18,574Jul 1, 2024Jul 2, 2024 ↗View →
PDFS
PDF SOLUTIONS INC
SALE
4,883$30.86$150.7K14,192Dec 13, 2023Dec 14, 2023 ↗View →
PDFS
PDF SOLUTIONS INC
SALE
867$31.29$27.1K19,075Dec 12, 2023Dec 14, 2023 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
3,354——19,942Jul 1, 2023Jul 5, 2023 ↗View →
PDFS
PDF SOLUTIONS INC
SALE
13,316$37.26$496.2K16,588Feb 28, 2023Mar 2, 2023 ↗View →
PDFS
PDF SOLUTIONS INC
SALE
2,500$30.05$75.1K29,904Nov 16, 2022Nov 17, 2022 ↗View →
PDFS
PDF SOLUTIONS INC
SALE
2,500$29.79$74.5K32,404Nov 15, 2022Nov 17, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
11,440——0Aug 18, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
11,440$7.63$87.3K43,138Aug 18, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
6,390$7.32$46.8K36,748Aug 18, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
PURCHASE
11,440$7.20$82.4K54,578Aug 18, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
10,397$7.50$78.0K43,138Aug 18, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
560$8.40$4.7K54,251Aug 17, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
4,100$7.56$31.0K54,251Aug 17, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
560——11,440Aug 17, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
716$8.41$6.0K53,535Aug 17, 2022Aug 18, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
PURCHASE
560$7.20$4.0K54,811Aug 17, 2022Aug 18, 2022 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
7,212——34,904Jul 1, 2022Jul 5, 2022 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
SALE
14,286$12.70$181.4K58,351Nov 17, 2021Nov 18, 2021 ↗View →
PDFS
PDF SOLUTIONS INC
SALE
3,000$33.00$99.0K27,692Nov 12, 2021Nov 15, 2021 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
4,688——30,692Jul 1, 2021Jul 2, 2021 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
PURCHASEGRANT
Stock grant
27,992——72,637May 10, 2021Nov 18, 2021 ↗View →
PDFS
PDF SOLUTIONS INC
PURCHASEGRANT
Stock grant
4,688——26,004Aug 1, 2020Aug 4, 2020 ↗View →
MRAM
EVERSPIN TECHNOLOGIES INC.
PURCHASEGRANT
Stock grant
21,359——44,645May 19, 2020May 20, 2020 ↗View →
Other insiders · PDFS
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About this filer
CIK 0001245081
ROLE
Director
PRIMARY
PDFS
COMPANIES
2
ACTIVE SINCE
May 2020
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