Amtech Systems Inc has 5 Schedule 13D or 13G filings on record since 2026-01-21. 3 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Piton Capital Partners LLC | 20.6% | 600,000 | SCHEDULE 13D/A, 2026-06-02 | 2026-06-01 |
| Wax Asset Management, LLC | 9.2% | 1,319,773 | SCHEDULE 13G/A, 2026-02-13 | 2025-12-31 |
| Orin Hirschman | 7.2% | 1,252,000 | SCHEDULE 13G, 2026-07-27 | 2026-06-30 |
| First Eagle Investment Management, LLC | 4.9% | 848,697 | SCHEDULE 13G/A, 2026-08-06 | 2026-06-30 |
| Dimensional Fund Advisors LP | 4.7% | 672,107 | SCHEDULE 13G/A, 2026-01-21 | 2025-12-31 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-01-21 | Dimensional Fund Advisors LP | 4.7% | SCHEDULE 13G/A |
| 2026-02-13 | Wax Asset Management, LLC | 9.2% | SCHEDULE 13G/A |
| 2026-06-02 | Piton Capital Partners LLC | 20.6% | SCHEDULE 13D/A |
| 2026-07-27 | Orin Hirschman | 7.2% | SCHEDULE 13G |
| 2026-08-06 | First Eagle Investment Management, LLC | 4.9% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.