Who owns Aehr Test Systems (AEHR)?
103 holders named in SEC filings declare between 65.3% and 76.7% of Aehr Test Systems' shares outstanding, as of Oct 2, 2026. The largest are BlackRock (8.2%), Vanguard (7.8%) and Jane Street (5.1%); the five largest hold 28.2% together. Another 163 institutions hold small positions worth 2.1%. At least 21.2% of the shares appear in no ownership filing: investors who do not have to report, mostly individuals. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 25.5% and sold 22.9% of the shares, a net purchase of 2.5%; 100 opened a position, 65 added, 71 reduced and 27 sold out. Biggest buyers: Two Sigma (+950,242 shares) and D. E. Shaw (+835,783 shares). Biggest sellers: AWM Investment Company, Inc. (-1.2M) and Fidelity (FMR) (-1.1M). Schedule 13D/G filings since Mar 31, 2026: JANE STREET GROUP, LLC crossed 5% (5.1%) on Jul 24, 2026, AWM Investment Company, Inc. fell below 5% (1.1% still declared) on Jun 30, 2026 and FMR LLC fell below 5% (3.1% still declared) on Jun 30, 2026. Directors and officers, from their latest Form 4: Rhea J. Posedel (1.3%), Gayn Erickson (1.1%) and Vernon Rogers (0.57%). Over time, 254 managers declared Aehr Test Systems in their 13F for Q2 2026, against 23 for Q4 2019: together at most 73.9% of the shares outstanding, against 23.6%.
| Holder | Filing | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|
| BlackRock | 13F | 8.2% | Jun 30, 2026 | Q4 2019 or earlier |
| Vanguard | 13F | 7.8% | Jun 30, 2026 | Q4 2019 or earlier |
| Jane Street | 13G | 5.1% | Jul 24, 2026 | — |
| D. E. Shaw | 13F | 3.6% | Jun 30, 2026 | Q3 2025 |
| Two Sigma | 13F | 3.6% | Jun 30, 2026 | Q3 2025 |
| Fidelity (FMR) | 13F | 3.1% | Jun 30, 2026 | Q4 2021 |
| Geode Capital | 13F | 2.7% | Jun 30, 2026 | Q4 2019 or earlier |
| T. Rowe Price | 13F | 2.5% | Jun 30, 2026 | Q2 2023 |
| Goldman Sachs | 13F | 2.5% | Jun 30, 2026 | Q1 2022 |
| JPMorgan | 13F | 2.2% | Jun 30, 2026 | Q4 2022 |
| State Street | 13F | 2.2% | Jun 30, 2026 | Q3 2021 |
| Connor, Clark & Lunn Investment Management Ltd. | 13F | 2.1% | Jun 30, 2026 | Q1 2026 |
| Morgan Stanley | 13F | 1.5% | Jun 30, 2026 | Q4 2019 or earlier |
| Rhea J. Posedel | Form 4 | 1.3% | Aug 14, 2026 | — |
| NEXT CENTURY GROWTH INVESTORS LLC | 13F | 1.3% | Jun 30, 2026 | Q3 2025 |
| Citadel | 13F | 1.2% | Jun 30, 2026 | Q3 2025 |
| Marshall Wace | 13F | 1.2% | Jun 30, 2026 | Q1 2026 |
| AWM Investment Company, Inc. | 13F | 1.1% | Jun 30, 2026 | Q4 2019 or earlier |
| Gayn Erickson | Form 4 | 1.1% | Oct 2, 2026 | — |
| Invesco | 13F | 0.91% | Jun 30, 2026 | Q4 2022 |
| Northern Trust | 13F | 0.85% | Jun 30, 2026 | Q4 2019 or earlier |
| Charles Schwab | 13F | 0.76% | Jun 30, 2026 | Q4 2021 |
| Science & Technology Partners, L.P. | 13F | 0.76% | Jun 30, 2026 | Q2 2026 |
| LORD, ABBETT & CO. LLC | 13F | 0.76% | Jun 30, 2026 | Q1 2026 |
| Wellington | 13F | 0.73% | Jun 30, 2026 | Q1 2024 |
Aehr Test Systems institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 23 | 23.6% | $11.0M | 82.8% |
| Q4 2020 | 21 | 21.2% | $12.6M | 73.1% |
| Q4 2021 | 71 | 40.5% | $262.7M | 74.4% |
| Q4 2022 | 126 | 57.7% | $321.7M | 79.6% |
| Q4 2023 | 164 | 69.7% | $533.6M | 64.0% |
| Q4 2024 | 131 | 70.5% | $347.5M | 59.1% |
| Q4 2025 | 147 | 70.6% | $427.8M | 64.6% |
| Q2 2026 | 254 | 73.9% | $2.2B | 57.5% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.