Aehr Test Systems
Aehr Test Systems (AEHR) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · AEHR · as of Sep 30, 2025
Ownership Breakdown
172
Institutional Holders
▲ 35 vs Q2
$613.07M
Total Inst. Value
▲ $385.72M vs Q2
31.45M
Shares Outstanding
freeFloat 94.59%
20.39M
13F Shares Held
▲ 2.82M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
AEHR largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC instruments for meas & testing of electricity & elec signals | 2.70M | 9.03% | 9.03% | $81.33B | Nov 13, 2025 | ▲ 1.21M |
VANGUARD GROUP INC instruments for meas & testing of electricity & elec signals | 2.29M | 7.65% | 7.65% | $68.90B | Nov 7, 2025 | ▲ 65.4K |
BLACKROCK, INC. instruments for meas & testing of electricity & elec signals | 2.00M | 6.69% | 6.69% | $60.29B | Nov 12, 2025 | ▼ 49.8K |
AWM INVESTMENT COMPANY, INC. instruments for meas & testing of electricity & elec signals | 1.57M | 5.24% | 5.24% | $47.18B | Nov 13, 2025 | ▼ 7.1K |
BAILLIE GIFFORD & CO instruments for meas & testing of electricity & elec signals | 1.53M | 5.12% | 5.12% | $46.09B | Oct 31, 2025 | ▼ 458.7K |
SUSQUEHANNA INTERNATIONAL GROUP, LLP instruments for meas & testing of electricity & elec signals | 930.4K | 3.11% | 3.11% | $28.01B | Nov 14, 2025 | ▲ 594.6K |
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC instruments for meas & testing of electricity & elec signals | 894.1K | 2.99% | 2.99% | $26.92B | Nov 12, 2025 | NEW |
GEODE CAPITAL MANAGEMENT, LLC instruments for meas & testing of electricity & elec signals | 680.1K | 2.27% | 2.27% | $20.48B | Nov 12, 2025 | ▲ 1.6K |
STATE STREET CORP instruments for meas & testing of electricity & elec signals | 602.1K | 2.01% | 2.01% | $18.13B | Nov 14, 2025 | ▼ 9.9K |
SUSQUEHANNA INTERNATIONAL GROUP, LLP instruments for meas & testing of electricity & elec signals | 567.7K | 1.90% | 1.90% | $17.09B | Nov 14, 2025 | ▲ 303.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+4.22M shares10
New Positions
first time holders17
Decreased
−1.53M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.69M
+4.22M / −1.53M
Net new holders
+15
10 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
AEHR insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
12
Buy transactions
76
Sell transactions
0.16
Buy/Sell ratio
$1M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
WIMMERS DIDIER Executive VP of R&D | Jun 3, 2026 | Tax Withhold | 332 | $114.59 | $38.0K | 10.3K | Form 4 ↗ |
Siu Chris CFO | Jun 1, 2026 | Tax Withhold | 350 | $93.62 | $32.8K | 69.9K | Form 4 ↗ |
SLAYEN HOWARD T director | May 13, 2026 | Sale | 6,819 | $104.73 | $714.2K | 169.7K | Form 4 ↗ |
Siu Chris CFO | May 14, 2026 | Sale | 470 | $108.00 | $50.8K | 70.3K | Form 4 ↗ |
Siu Chris CFO | May 14, 2026 | Sale | 1,600 | $106.78 | $170.8K | 5.7K | Form 4 ↗ |
SCOTT GEOFFREY GATES director | Apr 29, 2026 | Gift | 10,000 | — | — | 40.7K | Form 4 ↗ |
SALAMONE ALBERTO EVP, PPBI BUSINESS | May 1, 2026 | Tax Withhold | 204 | $93.07 | $19.0K | 47.8K | Form 4 ↗ |
SCOTT GEOFFREY GATES Director | Apr 29, 2026 | Tax Withhold | 10,000 | — | — | 40.7K | Form 4 ↗ |
SPORCK ALISTAIR N VP Contactor Business Unit | Apr 27, 2026 | Tax Withhold | 133 | $88.48 | $11.8K | 20.2K | Form 4 ↗ |
ROGERS VERNON Exec VP of Sales & Mktg. | Apr 27, 2026 | Tax Withhold | 139 | $88.48 | $12.3K | 147.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Aehr Test Systems (AEHR) is primarily owned by institutional investors, who hold approximately 64.8% of total shares outstanding. Company insiders own approximately 5.41%, while retail and public investors account for the remaining 29.75%.
The largest institutional shareholder of Aehr Test Systems is FMR LLC, holding approximately 2.70 million shares — equal to 9.03% of outstanding shares — as of September 30, 2025.
A total of 172 institutional investors currently hold AEHR stock, with a combined institutional value of approximately $613,071,734 as of the most recent 13F filing period.
Frequently asked questions
AEHR ownershipAehr Test Systems (AEHR) is primarily owned by institutional investors, who hold approximately 64.8% of shares. The largest shareholder is FMR LLC with a 9.03% stake. Company insiders hold 5.41%. Data sourced from SEC Form 13F as of September 30, 2025.