Who owns Amtech Systems (ASYS)
Which tracked institutional funds hold ASYS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ASYS 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 ASYS is one-sided between 2026-Q1 and 2026-Q2: 52 added or opened and 4 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
ASYS’s largest tracked holder by dollar value, AIGH Capital Management LLC, sizes it at 2.6% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 2.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ASYS 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 108 tracked filers holding ASYS, 83 increased or opened the position and 35 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 ASYS 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 13
- AIGH Capital Management LLC$29M
- AWM Investment Company, Inc.$16M
- Regal Partners Ltd$5M
- VANGUARD PORTFOLIO MANAGEMENT LLC$2M
- LOS ANGELES CAPITAL MANAGEMENT LLC$1M
- Capelight Capital Asset Management LP$1M
Full exits 2
- ACADIAN ASSET MANAGEMENT LLC$5M
- Pacific Ridge Capital Partners, LLC$5M
Largest adds
- BlackRock, Inc.$16M
- First Eagle Investment Management, LLC$10M
- VANGUARD CAPITAL MANAGEMENT LLC$7M
- GEODE CAPITAL MANAGEMENT, LLC$5M
- RENAISSANCE TECHNOLOGIES LLC$5M
- Connor, Clark & Lunn Investment Management Ltd.$4M
Largest trims
- MILLENNIUM MANAGEMENT LLC$3M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$576K
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 |
|---|---|---|---|---|
| AIGH Capital Management LLC new | 1,252,000 | $29M | 12.8% | 2026-Q2 |
| First Eagle Investment Management, LLC added | 848,426 | $20M | 8.7% | 2026-Q2 |
| BlackRock, Inc. added | 763,487 | $18M | 7.8% | 2026-Q2 |
| AWM Investment Company, Inc. new | 690,000 | $16M | 7.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 580,502 | $13M | 5.9% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 426,694 | $10M | 4.4% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 398,564 | $9M | 4.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 308,896 | $7M | 3.2% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 284,836 | $7M | 2.9% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 282,388 | $7M | 2.9% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 260,605 | $6M | 2.7% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 254,367 | $6M | 2.6% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 249,465 | $6M | 2.5% | 2026-Q2 |
| Regal Partners Ltd new | 237,503 | $5M | 2.4% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 194,714 | $4M | 2.0% | 2026-Q2 |
| STATE STREET CORP added | 155,849 | $4M | 1.6% | 2026-Q2 |
| Trexquant Investment LP trimmed | 119,750 | $3M | 1.2% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 111,472 | $3M | 1.1% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 106,246 | $2M | 1.1% | 2026-Q2 |
| Palisades Investment Partners, LLC added | 102,691 | $2M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 91,857 | $2M | 0.9% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 90,626 | $2M | 0.9% | 2026-Q2 |
| MORGAN STANLEY added | 82,999 | $2M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 81,805 | $2M | 0.8% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 81,351 | $2M | 0.8% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 79,684 | $2M | 0.8% | 2026-Q2 |
| UBS Group AG added | 79,085 | $2M | 0.8% | 2026-Q2 |
| Informed Momentum Co LLC trimmed | 72,579 | $2M | 0.7% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 71,293 | $2M | 0.7% | 2026-Q2 |
| XTX Topco Ltd trimmed | 69,832 | $2M | 0.7% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC new | 63,562 | $1M | 0.6% | 2026-Q2 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC added | 54,829 | $1M | 0.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 54,066 | $1M | 0.6% | 2026-Q2 |
| Capelight Capital Asset Management LP new | 50,000 | $1M | 0.5% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 49,501 | $1M | 0.5% | 2026-Q2 |
| Man Group plc added | 45,224 | $1M | 0.5% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 44,009 | $1M | 0.4% | 2026-Q2 |
| Hillsdale Investment Management Inc. added | 43,080 | $994K | 0.4% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 42,842 | $989K | 0.4% | 2026-Q2 |
| Bank of New York Mellon Corp new | 41,533 | $959K | 0.4% | 2026-Q2 |
| RITHOLTZ WEALTH MANAGEMENT added | 41,374 | $955K | 0.4% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 38,616 | $891K | 0.4% | 2026-Q2 |
| Engineers Gate Manager LP added | 38,552 | $890K | 0.4% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 37,761 | $872K | 0.4% | 2026-Q2 |
| Merit Financial Group, LLC | 37,000 | $854K | 0.4% | 2026-Q2 |
| Empowered Funds, LLC added | 34,672 | $800K | 0.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 34,536 | $797K | 0.4% | 2026-Q2 |
| Optimus Capital Advisors, LLC new | 30,000 | $692K | 0.3% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd new | 29,533 | $682K | 0.3% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC new | 28,468 | $657K | 0.3% | 2026-Q2 |
| WINTON GROUP Ltd new | 28,350 | $654K | 0.3% | 2026-Q2 |
| IRONWOOD INVESTMENT MANAGEMENT LLC trimmed | 27,193 | $628K | 0.3% | 2026-Q2 |
| Marex Group Ltd new | 26,118 | $603K | 0.3% | 2026-Q2 |
| Panoramic Capital, LLC new | 25,000 | $577K | 0.3% | 2026-Q2 |
| Dynamic Technology Lab Private Ltd trimmed | 21,380 | $493K | 0.2% | 2026-Q2 |
| Nuveen, LLC new | 20,681 | $477K | 0.2% | 2026-Q2 |
| Sowell Financial Services LLC | 20,206 | $466K | 0.2% | 2026-Q2 |
| VILLERE ST DENIS J & CO LLC | 20,000 | $462K | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 18,976 | $438K | 0.2% | 2026-Q2 |
| LPL Financial LLC trimmed | 18,026 | $416K | 0.2% | 2026-Q2 |
| WealthTrust Axiom LLC added | 17,800 | $411K | 0.2% | 2026-Q2 |
| KTF INVESTMENTS, LLC new | 17,000 | $392K | 0.2% | 2026-Q2 |
| NewEdge Advisors, LLC trimmed | 15,823 | $365K | 0.2% | 2026-Q2 |
| Integrated Quantitative Investments LLC new | 15,359 | $354K | 0.2% | 2026-Q2 |
| De Lisle Partners LLP new | 15,000 | $346K | 0.2% | 2026-Q2 |
| JAMES INVESTMENT RESEARCH, INC. | 14,600 | $337K | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD new | 13,600 | $314K | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 12,038 | $248K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS new | 11,987 | $277K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ new | 11,647 | $269K | 0.1% | 2026-Q2 |
| VIRTUS ADVISERS, LLC added | 11,481 | $265K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 10,685 | $247K | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP new | 10,557 | $244K | 0.1% | 2026-Q2 |
| State of Wyoming trimmed | 10,170 | $235K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. new | 10,000 | $117K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ new | 9,747 | $225K | 0.1% | 2026-Q2 |
| Truvestments Capital LLC added | 9,265 | $214K | 0.1% | 2026-Q2 |
| Invesco Ltd. new | 9,260 | $214K | 0.1% | 2026-Q2 |
| Legato Capital Management LLC new | 8,898 | $205K | 0.1% | 2026-Q2 |
| STRS OHIO new | 7,900 | $182K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC new | 7,046 | $163K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 5,490 | $127K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. new | 5,393 | $124K | 0.1% | 2026-Q2 |
| OSAIC HOLDINGS, INC. added | 4,295 | $99K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 4,282 | $99K | 0.0% | 2026-Q2 |
| SIMPLEX TRADING, LLC added | 4,230 | $98K | 0.0% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 4,170 | $96K | 0.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 3,714 | $86K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey new | 3,455 | $80K | 0.0% | 2026-Q2 |
| Kemnay Advisory Services Inc. new | 2,250 | $52K | 0.0% | 2026-Q2 |
| Farther Finance Advisors, LLC new | 1,700 | $39K | 0.0% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 1,176 | $27K | 0.0% | 2026-Q2 |
| Legal & General Group Plc new | 1,136 | $26K | 0.0% | 2026-Q2 |
| Ameritas Investment Partners, Inc. new | 1,063 | $25K | 0.0% | 2026-Q2 |
| Tower Research Capital LLC (TRC) trimmed | 632 | $15K | 0.0% | 2026-Q2 |
| Strengthening Families & Communities, LLC | 490 | $11K | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. added | 482 | $11K | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 365 | $8K | 0.0% | 2026-Q2 |
| Integrated Wealth Concepts LLC new | 300 | $7K | 0.0% | 2026-Q2 |
| FMR LLC added | 261 | $6K | 0.0% | 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.