Amtech Systems, Inc. (ASYS) Ownership
ASYS ownership summary
as of October 17, 2026- Institutions
- 88.2% of shares outstanding
- Insiders
- 9.15% of shares outstanding
- Shares outstanding
- 17.5M
- Float
- 13.6M shares available to trade
- Short interest
- 12.97% 1.6M shares short
- Days to cover
- 5.43 short interest down 0.9% vs prior month
- Institutions 88.18%
- Insiders 9.15%
- Other investors 2.67%
ASYS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Arnhold & S. Bleichroeder Advisers, LLC | 9.69% | 1.7M | $21.7M | +864,399 (+103.8%) | June 30, 2026 |
| 2 | AIGH Capital Management, LLC | 7.15% | 1.3M | $16.0M | +1.3M (0.0%) | June 30, 2026 |
| 3 | BlackRock Inc | 4.36% | 763K | $9.8M | +618,041 (+424.9%) | June 30, 2026 |
| 4 | Awm Investment Company Inc | 3.94% | 690K | $8.8M | +690,000 (0.0%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 3.32% | 581K | $7.4M | +16,175 (+2.9%) | June 30, 2026 |
| 6 | Acadian Asset Management LLC | 3.31% | 580K | $7.4M | +113,441 (+24.3%) | June 30, 2026 |
| 7 | Dimensional Fund Advisors, Inc. | 2.44% | 427K | $5.5M | −102,657 (−19.4%) | June 30, 2026 |
| 8 | Marshall Wace Asset Management Ltd | 2.28% | 399K | $5.1M | −18,512 (−4.4%) | June 30, 2026 |
| 9 | Arrowstreet Capital Limited Partnership | 1.76% | 309K | $4.0M | −56,491 (−15.5%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 1.63% | 285K | $3.6M | +152,687 (+115.5%) | June 30, 2026 |
| 11 | Connor Clark & Lunn Inv Mgmt Ltd | 1.61% | 282K | $3.6M | +108,229 (+62.1%) | June 30, 2026 |
| 12 | Renaissance Technologies Corp | 1.49% | 261K | $3.3M | +152,509 (+141.1%) | June 30, 2026 |
| 13 | Two Sigma Investments LLC | 1.45% | 254K | $3.3M | −12,489 (−4.7%) | June 30, 2026 |
| 14 | Jane Street Group LLC | 1.42% | 249K | $3.2M | −91,414 (−26.8%) | June 30, 2026 |
| 15 | VGI Partners Ltd | 1.36% | 238K | $3.0M | +237,503 (0.0%) | June 30, 2026 |
| 16 | Qube Research & Technologies | 1.11% | 195K | $2.5M | +106,197 (+120.0%) | June 30, 2026 |
| 17 | State Street Corp | 0.89% | 156K | $2.0M | +98,509 (+171.8%) | June 30, 2026 |
| 18 | Trexquant Investment LP | 0.68% | 120K | $1.5M | −54,139 (−31.1%) | June 30, 2026 |
| 19 | Bridgeway Capital Management, LLC | 0.64% | 111K | $1.4M | +2,354 (+2.2%) | June 30, 2026 |
| 20 | Citadel Advisors Llc | 0.61% | 106K | $1.4M | −668 (−0.6%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 4.4M shares and 7 cut 336K.
ASYS top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | First Eagle Small Cap Opportunity I | 4.19% | 734K | $9.4M | — | August 31, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.53% | 444K | $5.7M | — | August 31, 2026 |
| 3 | iShares Russell 2000 ETF | 2.06% | 361K | $4.6M | −4,160 (−1.1%) | September 30, 2026 |
| 4 | iShares Russell 2000 Growth ETF | 0.76% | 133K | $1.7M | −169 (−0.1%) | September 30, 2026 |
| 5 | Fidelity Small Cap Index | 0.73% | 128K | $1.6M | +1,223 (+1.0%) | July 31, 2026 |
| 6 | DFA US Small Cap I | 0.45% | 78K | $1.0M | — | August 31, 2026 |
| 7 | Vanguard Russell 2000 ETF | 0.39% | 68K | $865,229 | +1,984 (+3.0%) | August 31, 2026 |
| 8 | First Eagle US Small Cap Opp I-UC | 0.38% | 67K | $858,688 | — | August 31, 2026 |
| 9 | Fidelity Extended Market Index | 0.31% | 54K | $688,781 | −289 (−0.5%) | August 31, 2026 |
| 10 | Bridgeway Omni Small-Cap Value N | 0.28% | 49K | $629,760 | — | June 30, 2026 |
| 11 | Dimensional US Small Cap ETF | 0.28% | 49K | $622,157 | — | September 30, 2026 |
| 12 | DFA US Micro Cap I | 0.28% | 48K | $619,469 | +1,804 (+3.9%) | August 31, 2026 |
| 13 | DFA US Targeted Value I | 0.27% | 48K | $612,275 | −52,072 (−52.1%) | August 31, 2026 |
| 14 | iShares Micro-Cap ETF | 0.26% | 45K | $572,902 | −309 (−0.7%) | September 30, 2026 |
| 15 | Dimensional US Core Equity 2 ETF | 0.18% | 31K | $400,960 | — | September 30, 2026 |
| 16 | Schwab Small Cap Index | 0.16% | 28K | $364,390 | — | August 31, 2026 |
| 17 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.15% | 27K | $339,456 | +1,280 (+5.1%) | August 31, 2026 |
| 18 | Hillsdale US Micro Cap Equity Z US$ | 0.14% | 25K | $323,840 | — | June 30, 2026 |
| 19 | Avantis US Small Cap Equity ETF | 0.14% | 24K | $312,166 | — | September 30, 2026 |
| 20 | EA Bridgeway Ultra-Small Company Mkt ETF | 0.14% | 24K | $310,707 | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ASYS insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-05-16 | Robert C Daigle | Buy | $3.48 | 355 | $1,235 |
| 2025-05-15 | Robert C Daigle | Buy | $3.49 | 2,498 | $8,718 |
| 2025-05-14 | Robert C Daigle | Buy | $3.48 | 5,000 | $17,400 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ASYS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ASYS
Institutional investors own 88.2% of Amtech Systems's shares and insiders 9.15%. The largest holder is Arnhold & S. Bleichroeder Advisers, LLC with 9.69% of the shares (1.7M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 7 reduced their stake in the latest filings. Short interest is 12.97% of the float, or 5.43 days of average trading volume. The share count rose 49.0% since 2014.
Related: ASYS analyst forecast, ASYS key metrics. See the ASYS stock overview for the latest quote and news.
ASYS ownership FAQ
Who owns the most Amtech Systems stock?
The largest shareholders of Amtech Systems are Arnhold & S. Bleichroeder Advisers, LLC (9.69%), AIGH Capital Management, LLC (7.15%), BlackRock Inc (4.36%), Awm Investment Company Inc (3.94%), Vanguard Capital Management, LLC (3.32%).
What percentage of Amtech Systems is owned by institutions?
Institutions hold 88.2% of Amtech Systems's shares outstanding; insiders hold 9.15%.
Which funds own Amtech Systems?
The largest fund holders of Amtech Systems are First Eagle Small Cap Opportunity I (4.19%), Vanguard MStar Total Stk Mkt Idx Invest (2.53%), iShares Russell 2000 ETF (2.06%), iShares Russell 2000 Growth ETF (0.76%), Fidelity Small Cap Index (0.73%).
What is Amtech Systems's short interest?
1.6M shares of Amtech Systems were sold short, 12.97% of the float; at the average daily volume it would take 5.43 days to cover.
Are insiders buying or selling Amtech Systems?
Of the latest 3 reported insider transactions in Amtech Systems (since May 14, 2025), 3 were purchases and 0 were sales.
How many shares of Amtech Systems are outstanding?
Amtech Systems has 17.5M shares outstanding, of which 13.6M are in the public float.