AEHR
Aehr Test Systems
90.60$
+7.5%
vs. previous close
Closing price · As of: Sep 17, 2026
Ownership
Ownership Structure
Who owns Aehr Test Systems (AEHR)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 95.8% of the shares are freely tradable; institutional investors hold 73.3%.
Institutional ownership
?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
73.3%
Insiders
?Share of the stock held by the executives, founders and major shareholders of the company itself.
4.6%
Float
?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
95.8%
Short % of float
?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
14.0%
Shares Outstanding
?Total number of shares issued. Price times share count gives market cap.
33Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.00 | 2,286,899 | +7.5 | 03/31/2026 |
| FMR Inc | 6.56 | 2,142,639 | -14.6 | 03/31/2026 |
| Awm Investment Company Inc | 4.88 | 1,593,971 | +3.7 | 03/31/2026 |
| T. Rowe Price Associates, Inc. | 4.13 | 1,349,351 | +3,824.4 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.92 | 1,281,857 | +0.0 | 03/31/2026 |
| The Goldman Sachs Group Inc | 3.86 | 1,262,043 | +616.9 | 03/31/2026 |
| D. E. Shaw & Co LP | 3.61 | 1,177,421 | +244.6 | 06/30/2026 |
| Two Sigma Investments LLC | 3.57 | 1,164,614 | +443.3 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 2.81 | 917,876 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.92 | 954,373 | +0.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Posedel Rhea J | Director | 381,989 | 34,608,203 $ | Aug 14, 2026 | indirect |
| Erickson Gayn | President and CEO | 355,244 | 32,185,106 $ | Jul 27, 2026 | both |
| Richmond Donald P. Ii | CTO | 186,567 | 16,902,970 $ | Jul 27, 2026 | direct |
| Rogers Vernon | Exec VP of Sales & Mktg. | 186,232 | 16,872,619 $ | Aug 17, 2026 | direct |
| Slayen Howard T | Director | 140,667 | 12,744,430 $ | Aug 14, 2026 | direct |
| Scott Geoffrey Gates | Director | 85,603 | 7,755,632 $ | Jul 21, 2026 | both |
| Siu Chris | CFO | 77,328 | 7,005,917 $ | Sep 1, 2026 | direct |
| Engineer Adil | Chief Operating Officer | 46,477 | 4,210,816 $ | Aug 14, 2026 | direct |
| Salamone Alberto | EVP, PPBI BUSINESS | 41,962 | 3,801,757 $ | Aug 13, 2026 | direct |
| Sporck Alistair N | VP Contactor Business Unit | 22,547 | 2,042,758 $ | Aug 10, 2026 | direct |
| Oliphant Laura | Director | 16,100 | 1,458,660 $ | Aug 12, 2026 | direct |
| Wimmers Didier | Executive VP of R&D | 12,379 | 1,121,537 $ | Sep 3, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 3, 2026 | Wimmers Didier | Executive VP of R&D | Other | 317 | 76.27 | 24,178 |
| Sep 1, 2026 | Siu Chris | CFO | Other | 496 | 76.59 | 37,989 |
| Aug 17, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Sell | 3,994 | 143.77 | 574,217 |
| Aug 14, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Sell | 1,000 | 139.00 | 139,000 |
| Aug 14, 2026 | Engineer Adil | Chief Operating Officer | Other | 500 | 0.00 | – |
| Aug 14, 2026 | Slayen Howard T | Director | Sell | 5,700 | 133.03 | 758,264 |
| Aug 14, 2026 | Posedel Rhea J | Director | Sell | 5,973 | 140.00 | 836,220 |
| Aug 13, 2026 | Salamone Alberto | EVP, PPBI BUSINESS | Sell | 5,472 | 127.50 | 697,688 |
| Aug 13, 2026 | Salamone Alberto | EVP, PPBI BUSINESS | Sell | 4,200 | 128.00 | 537,600 |
| Aug 12, 2026 | Erickson Gayn | President and CEO | Sell | 38,452 | 130.79 | 5,028,968 |
| Aug 12, 2026 | Erickson Gayn | President and CEO | Sell | 1,548 | 132.27 | 204,750 |
| Aug 12, 2026 | Posedel Rhea J | Director | Sell | 8,413 | 130.00 | 1,093,690 |
| Aug 12, 2026 | Scott Geoffrey Gates | Director | Sell | 20,000 | 131.51 | 2,630,120 |
| Aug 12, 2026 | Scott Geoffrey Gates | Director | Other | 6,731 | 0.00 | – |
| Aug 12, 2026 | Engineer Adil | Chief Operating Officer | Sell | 7,500 | 131.10 | 983,213 |
| Aug 12, 2026 | Engineer Adil | Chief Operating Officer | Other | 15,000 | 9.45 | 141,750 |
| Aug 12, 2026 | Oliphant Laura | Director | Sell | 1,717 | 133.00 | 228,361 |
| Aug 10, 2026 | Sporck Alistair N | VP Contactor Business Unit | Sell | 1,000 | 108.49 | 108,490 |
| Aug 4, 2026 | Sporck Alistair N | VP Contactor Business Unit | Sell | 1,301 | 101.10 | 131,531 |
| Aug 4, 2026 | Sporck Alistair N | VP Contactor Business Unit | Sell | 699 | 100.70 | 70,386 |
| Aug 4, 2026 | Slayen Howard T | Director | Sell | 20,000 | 108.30 | 2,165,922 |
| Aug 4, 2026 | Oliphant Laura | Director | Other | 500 | 0.00 | – |
| Aug 3, 2026 | Salamone Alberto | EVP, PPBI BUSINESS | Other | 204 | 79.98 | 16,316 |
| Jul 30, 2026 | Slayen Howard T | Director | Other | 5,000 | 0.00 | – |
| Jul 27, 2026 | Erickson Gayn | President and CEO | Other | 1,057 | 77.48 | 81,896 |
| Jul 27, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Other | 198 | 77.48 | 15,341 |
| Jul 27, 2026 | Sporck Alistair N | VP Contactor Business Unit | Other | 133 | 77.48 | 10,305 |
| Jul 27, 2026 | Richmond Donald P. Ii | CTO | Other | 102 | 77.48 | 7,903 |
| Jul 27, 2026 | Engineer Adil | Chief Operating Officer | Other | 142 | 77.48 | 11,002 |
| Jul 21, 2026 | Scott Geoffrey Gates | Director | Other | 2,874 | 0.00 | – |
| Jul 20, 2026 | Sporck Alistair N | VP Contactor Business Unit | Other | 334 | 81.05 | 27,071 |
| Jul 16, 2026 | Scott Geoffrey Gates | Director | Sell | 20,000 | 82.13 | 1,642,650 |
| Jul 16, 2026 | Scott Geoffrey Gates | Director | Other | 10,000 | 0.00 | – |
| Jul 14, 2026 | Erickson Gayn | President and CEO | Other | 3,447 | 72.01 | 248,218 |
| Jul 14, 2026 | Richmond Donald P. Ii | CTO | Other | 328 | 72.01 | 23,619 |
| Jul 14, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Other | 573 | 72.01 | 41,262 |
| Jul 14, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Other | 3,538 | 1.64 | 5,785 |
| Jul 13, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Other | 588 | 72.60 | 42,689 |
| Jul 13, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Other | 15,262 | 1.64 | 24,953 |
| Jul 13, 2026 | Rogers Vernon | Exec VP of Sales & Mktg. | Other | 21,200 | 1.64 | 34,662 |
| Jul 13, 2026 | Sporck Alistair N | VP Contactor Business Unit | Other | 209 | 72.60 | 15,173 |
| Jul 13, 2026 | Siu Chris | CFO | Other | 988 | 72.60 | 71,729 |
| Jul 13, 2026 | Richmond Donald P. Ii | CTO | Other | 423 | 72.60 | 30,710 |
| Jul 13, 2026 | Erickson Gayn | President and CEO | Other | 4,404 | 72.60 | 319,730 |
| Jul 13, 2026 | Engineer Adil | Chief Operating Officer | Other | 387 | 72.60 | 28,096 |
| Apr 22, 2026 | Alistair N Sporck | VP | Sell | 2,000 | 93.50 | 187,000 |
| Apr 22, 2026 | Rhea J Posedel | Director | Sell | 17,115 | 100.00 | 1,711,500 |
| Apr 22, 2026 | Rhea J Posedel | Director | Sell | 604 | 95.00 | 57,380 |
| Apr 21, 2026 | Rhea J Posedel | Director | Sell | 8,787 | 96.02 | 843,728 |
| Apr 20, 2026 | Alberto Salamone | EVP | Sell | 15,000 | 89.57 | 1,343,550 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.