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CS

Chris Siu

AEHR
CFO · AEHR TEST SYSTEMS · CIK 0001389044
FILING MIX · LIFETIME29%/71%
BUYS
17
SELLS
41
TOTAL VALUE
$1.84M
COMPANIES
2
ACTIVE SINCE
Apr 2020
HOLDINGS NOW
117,930
AVG SELL PX
$40.97
TRADE KIND
SHOWING 58 / 58
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
3 backtested trades · 8 horizonsHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Chris Siu, 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
7d3+66.67%-1.31%+2.12%-3.43%-7.54%—
14d3+66.67%+2.99%+2.92%+0.07%-3.87%—
30d3+100.00%-14.07%+5.58%-19.65%-23.55%—
60d3+100.00%-30.77%+4.08%-34.85%-29.64%—
90d3+100.00%-27.93%+4.42%-32.36%-28.17%—
180d3+33.33%+3.83%+15.11%-11.27%+14.41%—
1y3+33.33%+20.10%+35.46%-15.36%+17.67%—
2y3+0.00%+12.55%+37.58%-25.02%-14.72%—
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
AEHR · 77,824 shares · as of Jul 13, 2026
020,54141,08261,62382,164202420252026SHARES 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 · 17 buys / 41 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
AEHR
AEHR TEST SYSTEMS
SALE
CFO
988$72.60$71.7K77,824Jul 13, 2026Jul 13, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
1,139$69.96$79.7K78,812Jul 2, 2026Jul 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASEGRANT
Stock grant
6,165——76,085Jul 1, 2026Jul 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
2,213$84.43$186.8K79,951Jul 1, 2026Jul 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASEGRANT
Stock grant
6,079——82,164Jul 1, 2026Jul 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
350$93.62$32.8K69,920Jun 1, 2026Jun 1, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
470$108.00$50.8K70,270May 14, 2026May 15, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
1,600$106.78$170.8K5,706May 14, 2026May 15, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
697$70.43$49.1K70,740Apr 11, 2026Apr 14, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
821$44.32$36.4K71,437Apr 2, 2026Apr 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASE
CFO
2,095$6.67$14.0K7,306Apr 1, 2026Apr 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
368$37.43$13.8K72,258Mar 1, 2026Mar 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
799$26.32$21.0K72,626Jan 11, 2026Jan 12, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
940$22.16$20.8K73,425Jan 2, 2026Jan 2, 2026 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
349$22.53$7.9K74,365Dec 1, 2025Dec 1, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
695$23.49$16.3K74,714Oct 13, 2025Oct 14, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
694$32.25$22.4K75,535Oct 2, 2025Oct 2, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
126$32.25$4.1K75,409Oct 2, 2025Oct 8, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASE
CFO
1,009$6.67$6.7K5,211Oct 1, 2025Oct 1, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
349$24.88$8.7K76,229Sep 2, 2025Sep 2, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
1,045$14.11$14.7K76,578Jul 11, 2025Jul 11, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
752$15.13$11.4K77,623Jul 2, 2025Jul 3, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASEGRANT
Stock grant
5,586——78,375Jul 2, 2025Jul 3, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASEGRANT
Stock grant
30,998——72,789Jul 2, 2025Jul 3, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
524$9.66$5.1K41,791Jun 2, 2025Jun 2, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
836$8.52$7.1K41,569Apr 11, 2025Apr 11, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASE
CFO
2,175$6.67$14.5K4,202Apr 1, 2025Apr 2, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
420$8.85$3.7K42,405Mar 3, 2025Mar 3, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
836$15.99$13.4K42,825Jan 13, 2025Jan 14, 2025 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
348$12.70$4.4K43,661Dec 2, 2024Dec 2, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
693$16.02$11.1K44,009Oct 11, 2024Oct 15, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASE
CFO
427$10.42$4.4K2,027Oct 1, 2024Oct 3, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
348$13.51$4.7K44,702Sep 3, 2024Sep 3, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASEGRANT
Stock grant
31,039——45,050Jul 11, 2024Jul 15, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
339$11.17$3.8K14,011Jun 3, 2024Jun 13, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASE
CFO
1,600$10.50$16.8K1,600Apr 1, 2024Apr 2, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
CFO
397$17.66$7.0K14,350Mar 1, 2024Mar 1, 2024 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
VP Finance/CFO
322$25.27$8.1K14,747Dec 6, 2023Dec 7, 2023 ↗View →
AEHR
AEHR TEST SYSTEMS
SALE
EXECUTIVE V.P. FINANCE & CFO
503$51.64$26.0K15,069Sep 1, 2023Sep 5, 2023 ↗View →
AEHR
AEHR TEST SYSTEMS
PURCHASEGRANT
Stock grant
15,572——15,572Sep 1, 2023Sep 5, 2023 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
3,986$33.56$133.8K40,106May 31, 2022Jun 2, 2022 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
PURCHASEGRANT
Stock grant
439$27.34$12.0K44,092May 6, 2022Jun 2, 2022 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
502$31.17$15.6K43,653Apr 30, 2022May 3, 2022 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
200$31.17$6.2K44,155Apr 30, 2022May 3, 2022 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
PURCHASEGRANT
Stock grant
6,235——44,355Apr 29, 2022May 3, 2022 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
566$33.56$19.0K39,818Apr 24, 2022Apr 26, 2022 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
1,698$33.56$57.0K38,120Apr 24, 2022Apr 26, 2022 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
4,480$56.33$252.4K41,884May 31, 2021Jun 2, 2021 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
PURCHASEGRANT
Stock grant
1,163——46,364Apr 30, 2021May 4, 2021 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
PURCHASEGRANT
Stock grant
4,364——45,201Apr 30, 2021May 4, 2021 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
1,698$54.11$91.9K40,837Apr 24, 2021Apr 27, 2021 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
566$54.11$30.6K42,535Apr 24, 2021Apr 27, 2021 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
PURCHASEGRANT
Stock grant
4,911——43,101Feb 10, 2021Feb 12, 2021 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALEGRANT
Gift
2,200——38,190Aug 4, 2020Aug 5, 2020 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
3,413$30.00$102.4K40,390Aug 4, 2020Aug 5, 2020 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
2,000$30.66$61.3K43,803Aug 3, 2020Aug 5, 2020 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
SALE
Chief Accounting Officer & SVP
4,114$20.73$85.3K45,803May 31, 2020Jun 1, 2020 ↗View →
UCTT
ULTRA CLEAN HOLDINGS, INC.
PURCHASEGRANT
Stock grant
14,734——49,917Apr 24, 2020Apr 28, 2020 ↗View →
Other insiders · AEHR
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About this filer
CIK 0001389044
ROLE
CFO
PRIMARY
AEHR
COMPANIES
2
ACTIVE SINCE
Apr 2020
MARKETPEEL · /INSIDER/0001389044DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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