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-Q2 13F filings (latest filed 2026-09-22). 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 2026-Q1 and 2026-Q2: 130 added or opened and 33 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 2026-Q1 and 2026-Q2, across 246 tracked filers holding AEHR, 169 increased or opened the position and 110 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 2026-Q1 and 2026-Q2 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 39
- Science & Technology Partners, L.P.$24M
- Driehaus Capital Management LLC$23M
- Trexquant Investment LP$19M
- NEUBERGER BERMAN GROUP LLC$16M
- KADENSA CAPITAL Ltd$15M
- Penn Capital Management Company, LLC$14M
Full exits 22
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$19M
- Point72 Asset Management, L.P.$14M
- SILVERCREST ASSET MANAGEMENT GROUP LLC$13M
- LORD, ABBETT & CO. LLC$7M
- ExodusPoint Capital Management, LP$3M
- KENNEDY CAPITAL MANAGEMENT LLC$3M
Largest adds
- BlackRock, Inc.$171M
- TWO SIGMA INVESTMENTS, LP$104M
- D. E. Shaw & Co., Inc.$100M
- VANGUARD CAPITAL MANAGEMENT LLC$79M
- JPMORGAN CHASE & CO$64M
- JANE STREET GROUP, LLC$62M
Largest trims
- AWM Investment Company, Inc.$23M
- BAILLIE GIFFORD & CO$18M
- Walleye Capital LLC$10M
- GILDER GAGNON HOWE & CO LLC$7M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$6M
- Penbrook Management LLC$2M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 2,659,542 | $255M | 12.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,320,350 | $127M | 6.0% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 1,177,421 | $113M | 5.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 1,164,614 | $112M | 5.3% | 2026-Q2 |
| FMR LLC trimmed | 1,006,830 | $97M | 4.6% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 966,659 | $93M | 4.4% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 875,505 | $84M | 4.0% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 810,036 | $78M | 3.7% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 753,523 | $72M | 3.4% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 732,547 | $70M | 3.3% | 2026-Q2 |
| STATE STREET CORP added | 712,926 | $68M | 3.3% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 670,758 | $64M | 3.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 507,035 | $49M | 2.3% | 2026-Q2 |
| MORGAN STANLEY added | 480,400 | $46M | 2.2% | 2026-Q2 |
| NEXT CENTURY GROWTH INVESTORS LLC trimmed | 410,731 | $39M | 1.9% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 400,732 | $38M | 1.8% | 2026-Q2 |
| MARSHALL WACE, LLP added | 382,738 | $37M | 1.8% | 2026-Q2 |
| AWM Investment Company, Inc. trimmed | 374,808 | $36M | 1.7% | 2026-Q2 |
| Invesco Ltd. added | 296,226 | $28M | 1.4% | 2026-Q2 |
| NORTHERN TRUST CORP added | 277,020 | $27M | 1.3% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 249,512 | $24M | 1.1% | 2026-Q2 |
| Science & Technology Partners, L.P. new | 249,000 | $24M | 1.1% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 238,453 | $23M | 1.1% | 2026-Q2 |
| Driehaus Capital Management LLC new | 238,422 | $23M | 1.1% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 212,881 | $20M | 1.0% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 204,550 | $20M | 0.9% | 2026-Q2 |
| BAILLIE GIFFORD & CO trimmed | 203,878 | $20M | 0.9% | 2026-Q2 |
| Trexquant Investment LP new | 201,892 | $19M | 0.9% | 2026-Q2 |
| UBS Group AG trimmed | 169,123 | $16M | 0.8% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC new | 167,664 | $16M | 0.8% | 2026-Q2 |
| BARD ASSOCIATES INC trimmed | 156,900 | $15M | 0.7% | 2026-Q2 |
| KADENSA CAPITAL Ltd new | 155,299 | $15M | 0.7% | 2026-Q2 |
| Penn Capital Management Company, LLC new | 150,547 | $14M | 0.7% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 145,612 | $14M | 0.7% | 2026-Q2 |
| BERKSHIRE CAPITAL HOLDINGS INC new | 142,640 | $14M | 0.7% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 138,047 | $13M | 0.6% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC new | 134,500 | $13M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 121,056 | $12M | 0.6% | 2026-Q2 |
| Kultura Capital Management LP added | 117,865 | $11M | 0.5% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 108,877 | $10M | 0.5% | 2026-Q2 |
| Nuveen, LLC added | 102,621 | $10M | 0.5% | 2026-Q2 |
| BARCLAYS PLC added | 101,249 | $10M | 0.5% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC trimmed | 100,204 | $10M | 0.5% | 2026-Q2 |
| Bank of New York Mellon Corp added | 93,571 | $9M | 0.4% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 93,404 | $9M | 0.4% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC trimmed | 87,546 | $8M | 0.4% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 86,773 | $8M | 0.4% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 82,275 | $8M | 0.4% | 2026-Q2 |
| OSAIC HOLDINGS, INC. trimmed | 75,960 | $7M | 0.3% | 2026-Q2 |
| POLEN CAPITAL MANAGEMENT LLC trimmed | 66,157 | $6M | 0.3% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 64,831 | $6M | 0.3% | 2026-Q2 |
| Evergreen Quality Fund GP, Ltd. new | 62,380 | $6M | 0.3% | 2026-Q2 |
| Pier Capital, LLC trimmed | 60,394 | $6M | 0.3% | 2026-Q2 |
| Swiss National Bank added | 59,900 | $6M | 0.3% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 56,027 | $5M | 0.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 52,815 | $5M | 0.2% | 2026-Q2 |
| Bouvel Investment Partners, LLC trimmed | 48,852 | $5M | 0.2% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. new | 44,892 | $4M | 0.2% | 2026-Q2 |
| Harvest Investment Services, LLC added | 44,359 | $4M | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC new | 44,106 | $4M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 41,611 | $4M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 40,960 | $4M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 38,835 | $4M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 37,518 | $4M | 0.2% | 2026-Q2 |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC new | 36,600 | $4M | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 36,497 | $1M | 0.1% | 2026-Q2 |
| Informed Momentum Co LLC trimmed | 36,322 | $3M | 0.2% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP new | 35,987 | $3M | 0.2% | 2026-Q2 |
| SHARIAPORTFOLIO, INC. new | 34,460 | $3M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 34,370 | $3M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 34,170 | $3M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 32,430 | $3M | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 31,946 | $3M | 0.1% | 2026-Q2 |
| Havemeyer Place LP new | 31,246 | $3M | 0.1% | 2026-Q2 |
| Sand Hill Global Advisors, LLC new | 25,700 | $2M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 24,017 | $2M | 0.1% | 2026-Q2 |
| Legal & General Group Plc trimmed | 23,821 | $2M | 0.1% | 2026-Q2 |
| Capstone Capital Management Ltd new | 21,867 | $2M | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 21,542 | $2M | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC new | 21,484 | $2M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 20,929 | $2M | 0.1% | 2026-Q2 |
| KP Management LLC new | 20,000 | $2M | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 19,035 | $2M | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 17,841 | $2M | 0.1% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL new | 17,838 | $2M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 17,837 | $2M | 0.1% | 2026-Q2 |
| LAUREL OAK WEALTH MANAGEMENT, LLC trimmed | 17,670 | $2M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 17,618 | $2M | 0.1% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 17,271 | $2M | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 16,850 | $2M | 0.1% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 16,654 | $2M | 0.1% | 2026-Q2 |
| Cetera Investment Advisers added | 16,652 | $2M | 0.1% | 2026-Q2 |
| Tidal Investments LLC new | 15,737 | $2M | 0.1% | 2026-Q2 |
| Johnson Financial Group, LLC trimmed | 15,255 | $1M | 0.1% | 2026-Q2 |
| Sun Group Wealth Partners trimmed | 15,067 | $1M | 0.1% | 2026-Q2 |
| Fortitude Advisory Group L.L.C. trimmed | 14,332 | $1M | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 14,100 | $1M | 0.1% | 2026-Q2 |
| Creative Planning added | 14,006 | $1M | 0.1% | 2026-Q2 |
| ROYCE & ASSOCIATES LP trimmed | 13,908 | $1M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 13,700 | $1M | 0.1% | 2026-Q2 |
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.