SCHEDULE 13D/A Filed 2026-06-02 Event 2026-06-01 SEC 0001104659-26-069614 →

PITON CAPITAL PARTNERS LLC → Amtech Systems Inc. ASYS

Stake: 20.60% Shares: 600,000 CUSIP: 032332504 Class: Common Stock, $0.01 Par Value Per Share

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

7 13D/G filings on this issuer

6 other filings besides this one

Filer Track Record

13 filings by this filer

12 other filings in the data moat

Short Interest · settle 2026-07-15

DTC 2.39

1,049,881 shares short · +45.6% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $855K

Point72 Asset Mgmt

Post-Filing Returns · since 2026-06-01 on ASYS

+1 day

0.0%

+5 days

0.0%

+30 days

0.0%

+60 days

—

+90 days

—

+180 days

—

Anchor price 17.87 on closest trading day on/after 2026-06-01. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Other 13D/G Filings on Amtech Systems Inc.

Filed	Form	Filer	Stake	Shares
2026-07-27	SCHEDULE 13G	HIRSCHMAN ORIN	—	—	view →
2025-02-18	SCHEDULE	PITON CAPITAL PARTNERS LLC	20.20%	2,894,588	view →
2022-02-24	SC	PITON CAPITAL PARTNERS LLC	—	—	view →
2020-01-30	SC	Privet Fund LP	—	—	view →
2018-07-17	SC	Schreyer Leslie J	—	—	view →
2018-01-03	SC	ROYCE & ASSOCIATES LP	—	—	view →

Other Filings by PITON CAPITAL PARTNERS LLC

Filed	Form	Issuer	Stake	Shares
2026-01-20	SCHEDULE	GULF ISLAND FABRICATION INC	—	—	view →
2025-02-18	SCHEDULE	AMTECH SYSTEMS INC ASYS	20.20%	2,894,588	view →
2022-02-24	SC	AMTECH SYSTEMS INC ASYS	—	—	view →
2022-02-02	SC	EVOLVING SYSTEMS INC	—	—	view →
2021-05-24	SC	GULF ISLAND FABRICATION INC	—	—	view →
2021-03-22	SC	EVOLVING SYSTEMS INC	—	—	view →
2020-03-18	SC	GULF ISLAND FABRICATION INC	—	—	view →
2020-02-27	SC	GULF ISLAND FABRICATION INC	—	—	view →
2019-11-21	SC	GULF ISLAND FABRICATION INC	—	—	view →
2019-01-11	SC	usell.com, Inc.	—	—	view →
2018-04-25	SC	GULF ISLAND FABRICATION INC	—	—	view →
2018-04-06	SC	GULF ISLAND FABRICATION INC	—	—	view →

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