A maker of the machines that stress-test semiconductors before they ship, Aehr Test Systems builds wafer-level (FOX) and package-level (Sonoma, Tahoe, Echo) test and burn-in systems. Its tools screen chips at high voltage and temperature to weed out early failures, serving AI processors, electric-vehicle power chips, and data-center optics. Founded in 1977 by Rhea Posedel in Fremont, California, the company holds over a hundred patents on its WaferPak and DiePak designs.
Wimmers DidierExecutive VP of R&D · 5 transactions
-29%
10.3K
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5.4K
Select a row to see that insider’s individual transactions. † Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 6 months: -521.9K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.