Amtech Systems Inc
ASYS- Exchange
- Nasdaq
- Industry
- Special Industry Machinery, NEC
- SEC CIK
- 0000720500
In the last 90 days, Amtech Systems Inc insiders filed 2 open-market purchases and 0 sales; 112 institutions reported holding it in 13F filings for Q2 2026, worth $241.5M in total; no superinvestor holds it.
Holders of 5% or more of ASYS
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Amtech Systems Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Piton Capital Partners LLC | 13D/A | 20.20%2.89M shares | – | Feb 18, 20251 filing | Feb 18, 2025 | SEC |
| Wax Asset Management, LLC | 13G/A | 9.20%1.32M shares | −6.60 ppfrom 15.80% | Feb 11, 20252 filings | Feb 13, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
7 Schedule 13D and 13G filings on Amtech Systems Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 13, 20264:29 PM ET | Wax Asset Management, LLC | 13G/A | 9.20%1.32M shares | −6.60 ppfrom 15.80% | Dec 31, 2025 | SEC |
| Jan 21, 20261:21 PM ET | Dimensional Fund Advisors LP | 13G/A | 4.70%672.1K shares | –Below 5% | Dec 31, 2025 | SEC |
| Apr 4, 20259:26 AM ET | Royce & Associates LP | 13G/A | 4.11%588.0K shares | −6.25 ppfrom 10.36%Below 5% | Mar 31, 2025 | SEC |
| Feb 18, 20254:01 PM ET | Piton Capital Partners LLCand 4 others | 13D/A | 20.20%2.89M shares | – | Feb 13, 2025 | SEC |
| Feb 12, 20255:54 PM ET | Pacific Ridge Capital Partners, LLC | 13G/A | 4.60%652.4K shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 11, 20258:15 AM ET | Wax Asset Management, LLC | 13G/A | 15.80%2.26M shares | – | Dec 31, 2024 | SEC |
| Jan 28, 20259:55 AM ET | Royce & Associates LP | 13G/A | 10.36%1.48M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Amtech Systems Inc shares.
No Form 144 notices for Amtech Systems Inc are on file.