Who owns Aehr Test Systems (AEHR)
Which tracked institutional funds hold AEHR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AEHR company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on AEHR is one-sided between 2025-Q4 and 2026-Q1: 88 added or opened and 13 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
AEHR’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes AEHR more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in AEHR divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 191 tracked filers holding AEHR, 123 increased or opened the position and 69 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in AEHR between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 19
- VANGUARD CAPITAL MANAGEMENT LLC$48M
- VANGUARD PORTFOLIO MANAGEMENT LLC$34M
- Connor, Clark & Lunn Investment Management Ltd.$8M
- VANGUARD FIDUCIARY TRUST CO$7M
- LORD, ABBETT & CO. LLC$7M
- ExodusPoint Capital Management, LP$3M
Full exits 6
- VANGUARD GROUP INC$47M
- Sculptor Capital LP$6M
- NATIONAL BANK OF CANADA /FI/$4M
- TWO SIGMA ADVISERS, LP$2M
- VICTORY CAPITAL MANAGEMENT INC$1M
- CAPTRUST FINANCIAL ADVISORS$911K
Largest adds
- PRICE T ROWE ASSOCIATES INC /MD/$49M
- GOLDMAN SACHS GROUP INC$43M
- BlackRock, Inc.$42M
- FMR LLC$29M
- AWM Investment Company, Inc.$28M
- NEXT CENTURY GROWTH INVESTORS LLC$17M
Largest trims
- Halter Ferguson Financial Inc.$12M
- WELLINGTON MANAGEMENT GROUP LLP$11M
- KENNEDY CAPITAL MANAGEMENT LLC$4M
- TUDOR INVESTMENT CORP ET AL$2M
- Squarepoint Ops LLC$1M
- GRATIA CAPITAL, LLC$865K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 2,659,542 | $255M | 17.5% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 1,177,421 | $113M | 7.7% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 1,164,614 | $112M | 7.6% | 2026-Q2 |
| FMR LLC trimmed | 1,006,830 | $97M | 6.6% | 2026-Q2 |
| STATE STREET CORP added | 712,926 | $68M | 4.7% | 2026-Q2 |
| AWM Investment Company, Inc. added | 1,593,971 | $59M | 4.0% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 507,035 | $49M | 3.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,281,857 | $48M | 3.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,262,043 | $47M | 3.2% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 400,732 | $38M | 2.6% | 2026-Q2 |
| MARSHALL WACE, LLP added | 382,738 | $37M | 2.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 917,876 | $34M | 2.3% | 2026-Q1 |
| Invesco Ltd. added | 296,226 | $28M | 1.9% | 2026-Q2 |
| NEXT CENTURY GROWTH INVESTORS LLC added | 754,737 | $28M | 1.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 725,711 | $27M | 1.8% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 238,453 | $23M | 1.6% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 204,550 | $20M | 1.3% | 2026-Q2 |
| BAILLIE GIFFORD & CO trimmed | 203,878 | $20M | 1.3% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC added | 513,293 | $19M | 1.3% | 2026-Q1 |
| GILDER GAGNON HOWE & CO LLC added | 444,296 | $16M | 1.1% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 368,000 | $14M | 0.9% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC new | 134,500 | $13M | 0.9% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC added | 344,247 | $13M | 0.9% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 108,877 | $10M | 0.7% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 277,045 | $10M | 0.7% | 2026-Q1 |
| RICE HALL JAMES & ASSOCIATES, LLC trimmed | 272,252 | $10M | 0.7% | 2026-Q1 |
| Walleye Capital LLC added | 267,187 | $10M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP added | 252,158 | $9M | 0.6% | 2026-Q1 |
| UBS Group AG added | 246,763 | $9M | 0.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 235,539 | $9M | 0.6% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. new | 218,809 | $8M | 0.6% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 202,039 | $7M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 197,166 | $7M | 0.5% | 2026-Q1 |
| LORD, ABBETT & CO. LLC new | 179,289 | $7M | 0.5% | 2026-Q1 |
| BARD ASSOCIATES INC trimmed | 179,127 | $7M | 0.5% | 2026-Q1 |
| POLEN CAPITAL MANAGEMENT LLC trimmed | 66,157 | $6M | 0.4% | 2026-Q2 |
| MORGAN STANLEY trimmed | 165,673 | $6M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 190,339 | $6M | 0.4% | 2026-Q1 |
| Pier Capital, LLC trimmed | 126,991 | $5M | 0.3% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC new | 44,106 | $4M | 0.3% | 2026-Q2 |
| OSAIC HOLDINGS, INC. added | 105,002 | $4M | 0.3% | 2026-Q1 |
| ExodusPoint Capital Management, LP trimmed | 93,622 | $3M | 0.2% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 93,037 | $3M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 89,405 | $3M | 0.2% | 2026-Q1 |
| Kultura Capital Management LP new | 80,200 | $3M | 0.2% | 2026-Q1 |
| Penbrook Management LLC trimmed | 79,515 | $3M | 0.2% | 2026-Q1 |
| KENNEDY CAPITAL MANAGEMENT LLC trimmed | 76,042 | $3M | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 75,244 | $3M | 0.2% | 2026-Q1 |
| KLCM Advisors, Inc. | 75,000 | $3M | 0.2% | 2026-Q1 |
| Bouvel Investment Partners, LLC added | 71,824 | $3M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 70,357 | $3M | 0.2% | 2026-Q1 |
| Johnson Financial Group, LLC new | 68,900 | $3M | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 61,582 | $2M | 0.2% | 2026-Q1 |
| Kestra Advisory Services, LLC | 60,100 | $2M | 0.2% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 59,939 | $2M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 57,500 | $2M | 0.1% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 56,800 | $2M | 0.1% | 2026-Q1 |
| BARCLAYS PLC added | 52,214 | $2M | 0.1% | 2026-Q1 |
| GRATIA CAPITAL, LLC trimmed | 51,560 | $2M | 0.1% | 2026-Q1 |
| IMC-Chicago, LLC added | 50,709 | $2M | 0.1% | 2026-Q1 |
| HERITAGE INVESTORS MANAGEMENT CORP | 48,413 | $2M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 41,599 | $2M | 0.1% | 2026-Q1 |
| LAUREL OAK WEALTH MANAGEMENT, LLC new | 38,670 | $1M | 0.1% | 2026-Q1 |
| ROYCE & ASSOCIATES LP trimmed | 38,102 | $1M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 36,833 | $1M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 34,381 | $1M | 0.1% | 2026-Q1 |
| Cambridge Investment Research Advisors, Inc. trimmed | 31,600 | $1M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 30,621 | $1M | 0.1% | 2026-Q1 |
| Fortitude Advisory Group L.L.C. added | 28,682 | $1M | 0.1% | 2026-Q1 |
| Quantinno Capital Management LP trimmed | 28,520 | $1M | 0.1% | 2026-Q1 |
| SANDLER CAPITAL MANAGEMENT new | 27,807 | $1M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 26,723 | $991K | 0.1% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 9,685 | $930K | 0.1% | 2026-Q2 |
| G2 Investment Partners Management LLC trimmed | 25,000 | $927K | 0.1% | 2026-Q1 |
| Legal & General Group Plc trimmed | 24,820 | $920K | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 23,586 | $875K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 23,554 | $873K | 0.1% | 2026-Q1 |
| Harvest Investment Services, LLC trimmed | 23,228 | $861K | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 23,109 | $857K | 0.1% | 2026-Q1 |
| 12 West Capital Management LP new | 22,000 | $816K | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 21,939 | $813K | 0.1% | 2026-Q1 |
| CLOUGH CAPITAL PARTNERS L P trimmed | 21,899 | $812K | 0.1% | 2026-Q1 |
| HORIZON KINETICS ASSET MANAGEMENT LLC added | 21,600 | $801K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 20,473 | $759K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 36,420 | $735K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 19,674 | $730K | 0.0% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 19,186 | $711K | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 2,337,433 | $47M | 3.2% | 2025-Q4 stale |
| Sculptor Capital LP | 300,000 | $6M | 0.4% | 2025-Q4 stale |
| NATIONAL BANK OF CANADA /FI/ trimmed | 206,011 | $4M | 0.3% | 2025-Q4 stale |
| AMERIPRISE FINANCIAL INC trimmed | 408,401 | $3M | 0.2% | 2025-Q1 stale |
| HighTower Advisors, LLC added | 78,340 | $2M | 0.2% | 2025-Q3 stale |
| Virtu Financial LLC new | 72,057 | $2M | 0.1% | 2025-Q3 stale |
| TWO SIGMA ADVISERS, LP new | 85,001 | $2M | 0.1% | 2025-Q4 stale |
| VICTORY CAPITAL MANAGEMENT INC | 69,540 | $1M | 0.1% | 2025-Q4 stale |
| Informed Momentum Co LLC new | 38,538 | $1M | 0.1% | 2025-Q3 stale |
| AMERICAN CENTURY COMPANIES INC added | 37,634 | $1M | 0.1% | 2025-Q3 stale |
| ESSEX INVESTMENT MANAGEMENT CO LLC new | 34,005 | $1M | 0.1% | 2025-Q3 stale |
| CAPTRUST FINANCIAL ADVISORS new | 45,107 | $911K | 0.1% | 2025-Q4 stale |
| Jump Financial, LLC added | 119,143 | $869K | 0.1% | 2025-Q1 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.