# EDGAR Filing Document

**Accession Number:** 0001644342
**File Stem:** 0001104659-26-069614
**Filing Date:** 2026-6
**Character Count:** 37216
**Document Hash:** 39f3f718e4d32451e5db6d27a87e3d05
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-069614.hdr.sgml**: 20260602

**ACCESSION NUMBER**: 0001104659-26-069614

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260602

**DATE AS OF CHANGE**: 20260602

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMTECH SYSTEMS INC
- **CENTRAL INDEX KEY:** 0000720500
- **STANDARD INDUSTRIAL CLASSIFICATION:** SPECIAL INDUSTRY MACHINERY, NEC [3559]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 860411215
- **STATE OF INCORPORATION:** AZ
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-39482
- **FILM NUMBER:** 261058425

**BUSINESS ADDRESS:**
- **STREET 1:** 58 S RIVER DRIVE SUITE 370
- **CITY:** TEMPE
- **STATE:** AZ
- **ZIP:** 85288
- **BUSINESS PHONE:** 4809675146

**MAIL ADDRESS:**
- **STREET 1:** 58 S RIVER DRIVE SUITE 370
- **CITY:** TEMPE
- **STATE:** AZ
- **ZIP:** 85288

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** QUARTZ ENGINEERING & MATERIALS INC
- **DATE OF NAME CHANGE:** 19870715
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PITON CAPITAL PARTNERS LLC
- **CENTRAL INDEX KEY:** 0001644342

**ORGANIZATION NAME:**
- **EIN:** 473106673
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** C/O KOKINO LLC
- **STREET 2:** 201 TRESSER BOULEVARD, 3RD FLOOR
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06901
- **BUSINESS PHONE:** (405) 936-6220

**MAIL ADDRESS:**
- **STREET 1:** C/O NORTH BAY ASSOCIATES
- **STREET 2:** 14000 QUAIL SPRINGS PARKWAY, SUITE 2200
- **CITY:** OKLAHOMA CITY
- **STATE:** OK
- **ZIP:** 73134

## Ex-99.(G)

**Exhibit G**

FORM OF LOCK-UP AGREEMENT

June [●], 2026

Titan Partners Group LLC,

a division of American Capital Partners, LLC

4 World Trade Center, 49<sup>th</sup> Floor

New York, New York 10007

Re: Underwriting Agreement, dated as of June [●], 2026 (the " <u>Underwriting Agreement</u> "), between Amtech Systems, Inc. (the " <u>Company</u> ") and Titan Partners Group LLC, a division of American Capital Partners, LLC (" <u>Titan</u> ").

Ladies and Gentlemen:

Capitalized terms used but not defined in this letter agreement (this "<u>Letter Agreement</u>") shall have the meanings set forth in the Underwriting Agreement. Pursuant to Section 5(j) of the Underwriting Agreement and in order to induce Titan to continue its efforts in connection with the public offering of shares of common stock, par value $0.01 (the "<u>Common Stock</u>"), of the Company, the undersigned irrevocably agrees that, from the date hereof until sixty (60) days after the Closing Date (such period, the "<u>Restriction Period</u>"), without the prior written consent of Titan, the undersigned will not offer, sell, contract to sell, hypothecate, pledge or otherwise dispose of (or enter into any transaction which is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic disposition due to cash settlement or otherwise) by the undersigned or any Affiliate of the undersigned or any person in privity with the undersigned or any Affiliate of the undersigned), directly or indirectly, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended (the "<u>Exchange Act</u>"), with respect to, any shares of Common Stock of the Company or securities convertible, exchangeable or exercisable into, shares of Common Stock of the Company beneficially owned, held or hereafter acquired by the undersigned (the "<u>Restricted Securities</u>") or make any demand for or exercise any right or cause to be filed a registration, including any amendments thereto, with respect to the registration of any Restricted Securities or publicly disclose the intention to do any of the foregoing. Beneficial ownership shall be calculated in accordance with Section 13(d) of the Exchange Act.

Notwithstanding the foregoing, and subject to the conditions below, the undersigned may transfer the Restricted Securities without the prior written consent of Titan, provided, in each case, that (1) in the case of transfers pursuant to clauses (i)-(ix) below, Titan receives a signed lock-up letter agreement (in the form of this Letter Agreement) for the balance of the Restriction Period from each donee, trustee, distributee, or transferee, as the case may be, prior to such transfer, (2) in the case of transfers pursuant to clauses (i)-(ix) below, any such transfer shall not involve a disposition for value, (3) in the case of transfers pursuant to clauses (i)-(iv) below, such transfer is not required to be reported with the Securities and Exchange Commission (the "<u>Commission</u>") in accordance with the Exchange Act, and neither the undersigned nor any donee, trustee, distributee or transferee, as the case may be, shall make or cause to be made any voluntary filing with the Commission, or any other voluntary public filing, report, press release or other public disclosure, regarding such transfer during the Restriction Period, and (4) in the case of transfers pursuant to clauses (v)-(ix), neither the undersigned nor any donee, trustee, distributee or transferee, as the case may be, otherwise voluntarily effects any public filing, report, press release or other public disclosure regarding such transfers during the Restriction Period, unless such filing, report or disclosure shall be legally required during the Restriction Period, in which case such filing, report or disclosure shall clearly state (a) that such transfer was effected pursuant to an exception under a lock-up agreement and is subject to the restrictions set forth therein and (b) that the transferee has executed a lock-up agreement containing restrictions on the transfer of the Restricted Securities for the balance of the Restriction Period (where applicable):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i) as a bona fide gift or gifts, including without limitation to a charitable organization or an educational institution, or for bona fide estate planning purposes;

ii) to any immediate family member or to any trust for the direct or indirect benefit of the undersigned or the immediate family of the undersigned (for purposes of this Letter Agreement, "immediate family" shall mean any relationship by blood, marriage or adoption, not more remote than first cousin);

iii) to any corporation, partnership, limited liability company, or other business entity all of the equity holders of which consist of the undersigned and/or the immediate family of the undersigned;

iv) if the undersigned is a corporation, partnership, limited liability company, trust or other business entity (a) to another corporation, partnership, limited liability company, trust or other business entity that is an Affiliate or investment fund of the undersigned, or (b) in the form of a distribution to limited partners, limited liability company members or shareholders of the undersigned or to the estate of any such partners, limited liability company members, shareholders or other equityholders;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;v) if the undersigned is a corporation, partnership, limited liability company, trust or other business entity, in connection with a sale, merger or transfer of all or substantially all of the assets of the undersigned or any other change of control of the undersigned, not undertaken for the purpose of avoiding the restrictions imposed by this Letter Agreement;

vi) if the undersigned is a trust, to a trustor or beneficiary of such trust or the estate of a beneficiary of such trust;

vii) by will, other testamentary document or intestate succession to the legal representative, heir, beneficiary or a member of the immediate family of the undersigned;

viii) by operation of law, including pursuant to a court or regulatory agency order, a settlement agreement or a qualified domestic relations order or in connection with a divorce decree;

ix) to a nominee or custodian of a person or entity to whom a disposition or transfer would be permissible under clauses (i), (ii), (iii), (vi), (vii) and (viii) above; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;x) to the Company in satisfaction of any tax withholding obligation or remittance payments; *provided* that no Restricted Securities shall be sold in the open market in connection therewith during the Restriction Period.

In addition, notwithstanding the foregoing, this Letter Agreement shall not restrict the delivery of shares of Common Stock to the undersigned upon (i) the exercise of any options granted under any employee benefit plan of the Company; *provided* that any shares of Common Stock or securities acquired in connection with any such exercise will be subject to the restrictions set forth in this Letter Agreement, or (ii) the exercise of warrants or any other security convertible into or exercisable for Common Stock; *provided* that such shares of Common Stock delivered to the undersigned in connection with such exercise or conversion are subject to the restrictions set forth in this Letter Agreement.

Furthermore, the undersigned may enter into any new plan established in compliance with Rule 10b5-1 of the Exchange Act; *provided* that (i) such plan may only be established if no public announcement or filing with the Commission, or other applicable regulatory authority, is made in connection with the establishment of such plan during the Restriction Period and (ii) no sale of shares of Common Stock are made pursuant to such plan during the Restriction Period.

The undersigned acknowledges that the execution, delivery and performance of this Letter Agreement is a material inducement to Titan to complete the transactions contemplated by the Underwriting Agreement and Titan shall be entitled to seek specific performance of the undersigned's obligations hereunder. The undersigned hereby represents that the undersigned has the power and authority to execute, deliver and perform this Letter Agreement, that the undersigned has received adequate consideration therefor and that the undersigned will indirectly benefit from the closing of the transactions contemplated by the Underwriting Agreement.

This Letter Agreement may not be amended or otherwise modified in any respect without the written consent of each of Titan and the undersigned. This Letter Agreement shall be construed and enforced in accordance with the laws of the State of New York without regard to the principles of conflict of laws to the extent the same would result in the application of the laws of another jurisdiction. The undersigned hereby irrevocably submits to the exclusive jurisdiction of the United States District Court sitting in the Southern District of New York and the courts of the State of New York located in Manhattan, for the purposes of any suit, action or proceeding arising out of or relating to this Letter Agreement, and hereby waives, and agrees not to assert in any such suit, action or proceeding, any claim that (i) it is not personally subject to the jurisdiction of such court, (ii) the suit, action or proceeding is brought in an inconvenient forum, or (iii) the venue of the suit, action or proceeding is improper. The undersigned hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or proceeding by receiving a copy thereof sent to the Company at the address in effect for notices to it under the Underwriting Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. The undersigned hereby waives any right to a trial by jury. Nothing contained herein shall be deemed to limit in any way any right to serve process in any manner permitted by law. The undersigned agrees and understands that this Letter Agreement does not intend to create any relationship between the undersigned and Titan and that Titan is not entitled to cast any votes on the matters herein contemplated and that no issuance or sale of the Shares is created or intended by virtue of this Letter Agreement.

This Letter Agreement shall be binding on successors and assigns of the undersigned with respect to the Restricted Securities and any such successor or assign shall enter into a similar agreement for the benefit of Titan.

It is understood that this Letter Agreement shall automatically terminate, and the undersigned shall be released from its obligations hereunder, upon the earliest to occur, if any, of (i) prior to the execution of the Underwriting Agreement, the Company advises Titan in writing that it has determined not to proceed with the offering of the Shares, (ii) the Underwriting Agreement is executed but is terminated prior to payment for and delivery of any Shares pursuant to the Underwriting Agreement, or (iii) June 30, 2026, in the event that the Underwriting Agreement has not been executed by such date.

This Letter Agreement is intended for the benefit of the parties hereto and their respective successors and permitted assigns and is not for the benefit of, nor may any provisions hereof be enforced by, any other Person.

\*\*\* SIGNATURE PAGE FOLLOWS\*\*

This Letter Agreement may be executed in two or more counterparts, all of which when taken together may be considered one and the same agreement.

---

| |
|:---|
| /s/ Robert M. Averick |
| Signature |
| Robert M. Averick |
| Print Name |
| Director |
| Position in Company, if any |
| Address for Notice: |
| 2986341 |
| Number of shares of Common Stock |
| 0 |
| Number of shares of Common Stock underlying subject to warrants, options, debentures or other convertible securities |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 8)**

**Amtech Systems Inc.**

*(Name of Issuer)*

**Common Stock, $0.01 Par Value Per Share**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Garrett Lynam**<br>Kokino LLC<br>201 Tresser Boulevard, 3rd Floor<br>Stamford CT 06901<br>203-595-4552

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**06/01/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Piton Capital Partners LLC** | Name of reporting person<br>**Piton Capital Partners LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**600000.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**600000.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**600000.00** | Aggregate amount beneficially owned by each reporting person<br>**600000.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.1%** | Percent of class represented by amount in Row (11)<br>**4.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** * See Item 2 and Item 5.

**This calculation is rounded to the nearest tenth and is based on 14,499,088 Shares outstanding, as reported on the cover page of the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the SEC on May 7, 2026 (File No. 000-11412).

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Cornice Fiduciary Management LLC, as Trustee under Trust Agreement dated December 23, 1989 FBO the issue of Jonathan D. Sackler** | Name of reporting person<br>**Cornice Fiduciary Management LLC, as Trustee under Trust Agreement dated December 23, 1989 FBO the issue of Jonathan D. Sackler** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**WYOMING** | Citizenship or place of organization<br>**WYOMING** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**1386312.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**1386312.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1386312.00** | Aggregate amount beneficially owned by each reporting person<br>**1386312.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**9.6%** | Percent of class represented by amount in Row (11)<br>**9.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** * See Item 2 and Item 5.

** This calculation is rounded to the nearest tenth and is based on 14,499,088 Shares outstanding, as reported on the cover page of the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the SEC on May 7, 2026 (File No. 000-11412).

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Robert Averick** | Name of reporting person<br>**Robert Averick** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**2986341.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**2986341.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**2986341.00** | Aggregate amount beneficially owned by each reporting person<br>**2986341.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**20.6%** | Percent of class represented by amount in Row (11)<br>**20.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** * See Item 2 and Item 5.

** This calculation is rounded to the nearest tenth and is based on 14,499,088 Shares outstanding, as reported on the cover page of the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the SEC on May 7, 2026 (File No. 000-11412).

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**M3C Holdings LLC** | Name of reporting person<br>**M3C Holdings LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**263688.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**263688.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**263688.00** | Aggregate amount beneficially owned by each reporting person<br>**263688.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**1.8%** | Percent of class represented by amount in Row (11)<br>**1.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** * See Item 2 and Item 5.

** This calculation is rounded to the nearest tenth and is based on 14,499,088 Shares outstanding, as reported on the cover page of the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the SEC on May 7, 2026 (File No. 000-11412).

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**OIH LLC** | Name of reporting person<br>**OIH LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CONNECTICUT** | Citizenship or place of organization<br>**CONNECTICUT** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**22917.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**22917.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**22917.00** | Aggregate amount beneficially owned by each reporting person<br>**22917.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.2%** | Percent of class represented by amount in Row (11)<br>**0.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** * See Item 2 and Item 5.

** This calculation is rounded to the nearest tenth and is based on 14,499,088 Shares outstanding, as reported on the cover page of the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the SEC on May 7, 2026 (File No. 000-11412).

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, $0.01 Par Value Per Share

**(b) Name of Issuer:**
Amtech Systems Inc.

**(c) Address of Issuer's Principal Executive Offices:**
58 S River Drive Suite 370, Tempe, AZ, 85288

Pursuant to Rule 13d-2 promulgated under the Act, this amendment to Schedule 13D (this "Amendment No. 8") amends the Schedule 13D filed on January 25, 2016 (the "Original Schedule 13D"), as most recently amended on February 18, 2025.  The Original Schedule 13D and all amendments thereto (including this amendment) are collectively referred to herein as the "Schedule 13D".  Capitalized terms used but not defined in this Amendment No. 8 shall have the meanings given to them in the Original Schedule 13D (as amended).  The Original Schedule 13D (as amended) remains in full force and effect, except as specifically amended by this Amendment No. 8.  This Amendment No. 8 is being filed to report Mr. Averick's entry into the Lock-Up Agreement (as defined and described in the response to Item 6).

**Item 5. Interest in Securities of the Issuer**

**(a)**
Item 5(a) is hereby amended and restated to read as follows:

The percentages used in this Schedule 13D are rounded to the nearest tenth and based on 14,499,088 Shares outstanding, as reported on the cover page of the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the SEC on May 7, 2026 (File No. 000-11412).

See rows (11) and (13) of the cover pages to this Schedule 13D for the aggregate number of Shares and percentage of the Shares beneficially owned by each of the Reporting Persons as of the close of business on June 2, 2026 based on reported shares in the 10-Q mentioned above. The filing of this Schedule 13D shall not be deemed an admission that the Reporting Persons are, for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, the beneficial owners of any securities of the Issuer that he or it does not directly own. Each of the Reporting Persons specifically disclaims beneficial ownership of the securities reported herein that he or it does not directly own.

**(b)**
Item 5(b) is hereby amended and restated to read as follows:

See rows (7) through (10) of the cover pages to this Schedule 13D for the number of Shares as to which each Reporting Person has the sole or shared power to vote or direct the vote and the sole or shared power to dispose or to direct the disposition.

The Trust is a member of Piton, along with other "Family Clients" (as defined in Investment Advisers Act Rule 202(a)(11)(G)-1 (the "Family Office Rule")) of Kokino.

M3C is a member of Piton, along with other Family Clients of Kokino.

Mr. Averick's principal occupation is acting as a Portfolio Manager at Kokino, which is a single-family office that provides investment management services only to its Family Clients, including the Trust, M3C and Piton. Mr. Averick is also currently a director of the Issuer. See Item 2. As a Portfolio Manager at Kokino, Mr. Averick shares the power to vote and dispose (or direct the disposition of) 2,986,341 Shares, which is the sum of the Shares beneficially owned by the following Reporting Persons: (i) 1,386,312 Shares beneficially owned by the Trust; (ii) 263,688 Shares beneficially owned by M3C; (iii) 600,000 Shares beneficially owned by Piton; and (iv) 736,341 Shares beneficially owned by Mr. Averick. With respect to the 736,341 Shares described in clause (iv) above, Mr. Averick's spouse may be deemed to share the power to vote and dispose or direct the disposition of such Shares. Mr. Averick holds an economic interest in Piton (which interest may be held directly and, from time to time, indirectly through PCM).  Mr. Averick also holds unvested restricted stock units that are not included in this Share count as they vest on March 4, 2027.

Piton is a pooled investment vehicle formed for the benefit of a single family and certain "key employees" (as defined in the Family Office Rule) of Kokino.  The Trust, M3C and Mr. Averick are members of Piton, along with other Family Clients of Kokino.  Piton is managed by its managing member, PCM.  PCM is in turn managed by its managing member, Kokino.  Additionally, Kokino is the trading manager of Piton and provides investment management services to the Trust and M3C, and in those capacities Kokino acts on behalf of such Reporting Persons as an agent.  Mr. Averick, in his capacity as an employee of Kokino, manages the Trust's, M3C's and Piton's respective investments in the Shares with assistance from other Kokino personnel.  PCM and Kokino are each a "family office" (as defined in the Family Office Rule) of the same family, and any voting power or investment power PCM or Kokino may hold over the Shares is ultimately attributed to the Trust, M3C and Piton (as applicable).

OIH is a Connecticut limited liability company and investment entity controlled by Brian Olson. Brian Olson is the President and Chief Investment Officer of Kokino.  As a key employee of Kokino and manager of OIH, Mr. Olson may be deemed to share the power to vote and dispose (or direct the disposition of) 2,272,917 Shares, which is the sum of the Shares beneficially owned by the following Reporting Persons: (i) 1,386,312 Shares beneficially owned by the Trust; (ii) 263,688 Shares beneficially owned by M3C; (iii) 600,000 Shares beneficially owned by Piton; and (iv) 22,917 Shares beneficially owned by OIH.

**(c)**
Except as set forth below, none of the Reporting Persons has effected any transaction in the Shares during the past sixty (60) days.  On May 28, 2026, Mr. Averick acquired an aggregate of 18,000 Shares upon the exercise of director stock options, consisting of (i) 6,000 Shares at an exercise price of $7.40 per Share, (ii) 6,000 Shares at an exercise price of $11.51 per Share, and (iii) 6,000 Shares at an exercise price of $10.22 per Share.  Following these exercises, Mr. Averick no longer holds any director stock options of the Issuer.  The foregoing transactions were reported on a Form 4 filed by Mr. Averick with the SEC on June 1, 2026, and are incorporated herein by reference.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Item 6 of the Schedule 13D is hereby amended and supplemented by inserting the following text prior to the final paragraph:

In connection with an underwritten public offering of Shares by the Issuer announced on June 1, 2026 (the "Offering"), Mr. Averick, in his capacity as a director of the Issuer, entered into a lock-up agreement, dated as of June 1, 2026 (the "Lock-Up Agreement"), with Titan Partners Group LLC, a division of American Capital Partners, LLC ("Titan"). Subject to the exceptions set forth therein, the Lock-Up Agreement provides that, for the period from the date of the Lock-Up Agreement until sixty (60) days after the Closing Date (as defined in the related underwriting agreement (the "Underwriting Agreement")) (such period, the "Restriction Period"), Mr. Averick will not, without the prior written consent of Titan, offer, sell, contract to sell, hypothecate, pledge or otherwise dispose of, directly or indirectly, or enter into any transaction designed to, or that might reasonably be expected to, result in the disposition of, any Shares or any securities convertible into, or exchangeable or exercisable for, Shares beneficially owned, held or thereafter acquired by him (the "Restricted Securities"), or publicly disclose an intention to effect any of the foregoing. The Lock-Up Agreement also restricts Mr. Averick from making any demand for, or exercising any right with respect to, the registration of any Restricted Securities. The Lock-Up Agreement terminates automatically upon the earliest to occur of the events specified therein, including if the Underwriting Agreement has not been executed by June 30, 2026.

Because beneficial ownership for purposes of the Lock-Up Agreement is calculated in accordance with Section 13(d) of the Act, the Restricted Securities may include not only Shares held directly by Mr. Averick but also Shares that may be deemed to be beneficially owned by Mr. Averick by virtue of the shared voting and dispositive power described in Item 5, including Shares held by the Trust, M3C and Piton. In addition, the Lock-Up Agreement covers certain transactions designed to, or that might reasonably be expected to, result in a disposition by any affiliate of, or any person in privity with, Mr. Averick or his affiliates, which may be deemed to include the Trust, M3C and Piton. The filing of this Amendment No. 8 shall not be deemed an admission that Mr. Averick or any other Reporting Person is the beneficial owner of any securities covered by the Lock-Up Agreement that he or it does not directly own, and each Reporting Person disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

The foregoing description of the Lock-Up Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Lock-Up Agreement, a copy of which is filed as Exhibit G hereto and is incorporated herein by reference.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Piton Capital Partners LLC

**Signature:** /s/ Garrett Lynam

**Name/Title:** Garrett Lynam, as General Counsel of Kokino LLC (as Managing Member of Piton Capital Management LLC, Managing Member of Piton Capital Partners)

**Date:** 06/02/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Cornice Fiduciary Management LLC, as Trustee under Trust Agreement dated December 23, 1989 FBO the issue of Jonathan D. Sackler

**Signature:** /s/ Jeffrey Robins

**Name/Title:** Jeffrey Robins, Vice President

**Date:** 06/02/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Robert Averick

**Signature:** /s/ Robert Averick

**Name/Title:** Robert Averick

**Date:** 06/02/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** M3C Holdings LLC

**Signature:** /s/ Garrett Lynam

**Name/Title:** Garrett Lynam, Vice President

**Date:** 06/02/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** OIH LLC

**Signature:** /s/ Brian Olson

**Name/Title:** Brian Olson, Manager

**Date:** 06/02/2026