# EDGAR Filing Document

**Accession Number:** 0000720500
**File Stem:** 0000720500-26-000006
**Filing Date:** 2026-6
**Character Count:** 17166
**Document Hash:** ad86ab06056fd3a0714644564d42d4a2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000720500-26-000006.hdr.sgml**: 20260601

**ACCESSION NUMBER**: 0000720500-26-000006

**CONFORMED SUBMISSION TYPE**: S-3MEF

**PUBLIC DOCUMENT COUNT**: 14

**FILED AS OF DATE**: 20260601

**DATE AS OF CHANGE**: 20260601

**EFFECTIVENESS DATE**: 20260601

**FILER**: 

**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:** S-3MEF
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-296410
- **FILM NUMBER:** 261053187

**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

**As filed with the Securities and Exchange Commission on June 1, 2026**

**Registration No. 333-294296**

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**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

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**FORM S-3**

**REGISTRATION STATEMENT UNDER**

**THE SECURITIES ACT OF 1933**

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**AMTECH SYSTEMS, INC.** 

(Exact name of registrant as specified in its charter)

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| | |
|:---|:---|
| Arizona | **86-0411215** |
| (State or other jurisdiction of<br>incorporation or organization) | (I.R.S. Employer<br>Identification Number) |

---

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**58 South River Drive Suite 370**

**Tempe, Arizona 85288**

**(480) 967-5146**

(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

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**Robert C. Daigle**

**Chief Executive Officer**

**Amtech Systems, Inc.**

**58 South River Drive, Suite 370**

**Tempe, Arizona 85288**

**(480) 967-5146**

(Name, address, including zip code, and telephone number, including area code, of agent for service)

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***Copy to*:**

**Gregory R. Hall**

**DLA Piper LLP (US)**

**2525 E. Camelback Road, Suite 1000**

**Phoenix, Arizona 85016**

**(480) 606-5100**

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**Approximate date of commencement of proposed sale to the public:** From time to time after the effective date of this registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box: 

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box: ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering: ☒ (File No. 333-294296)

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. 

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. 

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

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| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ☐ | Accelerated filer  | ☐ |
| Non-accelerated filer | ☒ | Smaller reporting company | ☒ |
|  |  | Emerging growth company | ☐ |

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. 

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**This Registration Statement shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(b) of the Securities Act.**

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**EXPLANATORY NOTE AND INCORPORATION BY REFERENCE**

The registrant previously registered securities at an aggregate offering price not to exceed $50,000,000 on a Registration Statement on Form S-3 (File No. 333-294296), which was filed by the registrant on March 13, 2026 and declared effective on March 23, 2026 (the "Prior Registration Statement"). In accordance with Rule 462(b) under the Securities Act of 1933, as amended (the "Securities Act"), and General Instruction IV.A of Form S-3, an additional number of securities having a proposed maximum aggregate offering price of $10,000,000 is hereby registered on this Registration Statement on Form S-3 (the "Registration Statement"), representing no more than 20% of the maximum aggregate offering price of unsold securities under the Prior Registration Statement. In no event will the maximum aggregate offering price of all securities issued pursuant to this Registration Statement and the Prior Registration Statement exceed that registered under such registration statements. The contents of the Prior Registration Statement, including each of the documents filed by the Registrant with the Securities and Exchange Commission and incorporated or deemed to be incorporated by reference therein and all exhibits thereto are hereby incorporated by reference.

The required exhibits are listed on the Exhibit Index attached hereto and filed herewith.

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**Exhibit Index**

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| | |
|:---|:---|
| **Exhibit**<br>**Number** | **Exhibit Title** |
| 5.1 | [<u>Opinion of DLA Piper LLP (US)</u>](asys-ex5_1.htm) |
| 23.1 | [<u>Consent of KPMG LLP</u>](asys-ex23_1.htm) |
| 23.2 | [<u>Consent of DLA Piper LLP (US) (included in Exhibit 5.1)</u>](asys-ex5_1.htm) |
| 107 | [<u>Filing Fee Table</u>](asys-exfiling_fees.htm) |

---

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**SIGNATURES**

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Tempe, State of Arizona on June 1, 2026.

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| | |
|:---|:---|
| **Amtech systems, inc.** | **Amtech systems, inc.** |
| By: | /s/ Thomas Sabol |
|  | Chief Financial Officer |

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Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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| | | |
|:---|:---|:---|
| **Name** | **Title** | **Date** |
| /s/ ROBERT C. DAIGLE | President, Chief Executive Officer and Chairman | June 1, 2026 |
| Robert C. Daigle |  |  |
| /s/ THOMAS SABOL | Chief Financial Officer | June 1, 2026 |
| Thomas Sabol | *(Principal Financial and Accounting Officer)* |  |
| \* | Director | June 1, 2026 |
| Robert M. Averick |  |  |
| \* | Director | June 1, 2026 |
| Michael Garnreiter |  |  |
| \* | Director | June 1, 2026 |
| Michael M. Ludwig |  |  |
| \* | Director | June 1, 2026 |
| Asif Y. Jakwani |  |  |

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\*By:

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| |
|:---|
| /s/ ROBERT C. DAIGLE |
| Robert C. Daigle |

---

Attorney-in-Fact

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## Exhibit 5.1

**DLA Piper LLP (US)**

2525 E. Camelback Road, Suite 1000<br>Phoenix, AZ 85016

![img161358662_0.jpg](img161358662_0.jpg)

June 1, 2026

Amtech Systems, Inc.

58 South River Drive, Suite 370

Tempe, Arizona 85288

**Re: Registration Statement on Form S-3**

Ladies and Gentlemen:

We have acted as counsel to Amtech Systems, Inc., an Arizona corporation (the "***Company***"), in connection with the filing of the Registration Statement on Form S-3 filed on June 1, 2026 pursuant to Rule 462(b) under the Shares Act of 1933, as amended (the "***Rule 462(b) Registration Statement***"). The Rule 462(b) Registration Statement incorporates by reference the contents of the Registration Statement on Form S-3 (File No. 333-294296) originally filed by the Company with the Securities Exchange Commission (the "***SEC***") on March 13, 2026, and declared effective on March 23, 2026, including a base prospectus (the "***Base Prospectus***"), which provides that it will be supplemented by one or more prospectus supplements (each such prospectus supplement, together with the Base Prospectus, a "***Prospectus***"), under the Securities Act of 1933, as amended (the "***Securities Act***"). The Rule 462(b) Registration Statement covers an underwritten public offering of up to $10,000,000.00 of the Company's securities, including shares (the "***Shares***") of the Company's common stock, par value $0.01 per share.

In connection with this opinion letter, we have examined such documents, records and other instruments as we have deemed appropriate for purposes of the opinion set forth herein. In such examination, we have assumed the genuineness of all signatures, the legal capacity of all natural persons, the authenticity of the documents submitted to us as originals, the conformity to the authentic originals of all documents submitted to us as copies. As to matters of fact relevant to our opinion set forth below, we have relied, without independent investigation, on certificates of public officials and of officers of the Company. The opinion expressed herein is limited to the Arizona Business Corporation Act.

Based upon the foregoing, we are of the opinion that the Shares have been validly issued and are fully paid and non-assessable.

We hereby consent to the use of this opinion as Exhibit 5.1 to the Rule 462(b) Registration Statement. In giving such consent, we do not hereby admit that we are acting within the category of persons whose consent is required under Section 7 of the Securities Act or the rules or regulations of the SEC thereunder.

Our opinion is expressly limited to the matters set forth above, and we render no opinion, whether by implication or otherwise, as to any other matters relating to the Company, the Shares or the Prospectus. This opinion is rendered as of the date hereof, and we assume no obligation to advise you of any fact, circumstance, event or development that may hereafter be brought to our attention whether or not such occurrence would alter, affect or modify the opinion expressed herein.

Very truly yours,

/s/ DLA Piper LLP (US)

**DLA Piper LLP (US)**

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## Exhibit 23.1

**Exhibit 23.1**

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

We consent to the use of our report dated December 10, 2025, with respect to the consolidated financial statements of Amtech Systems, Inc. and subsidiaries, incorporated herein by reference, and to the reference to our firm under the heading "Experts" in the prospectus.

---

| |
|:---|
| /s/ KPMG LLP |
| Phoenix, Arizona <br>June 1, 2026 |

---

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## Ex-Filing

?xml version='1.0' encoding='ASCII'? EX-FILING FEES

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| |
|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Calculation of Filing Fee Tables**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **S-3**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **AMTECH SYSTEMS INC**  |

---

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| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| | | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Type**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Class Title**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Fee Calculation or Carry Forward Rule**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Maximum Aggregate Offering Price**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Fee Rate**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Amount of Registration Fee**  |
| **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** |
|  |  | Equity | Common Stock, par value $0.01 per share ("Common Stock") | 457(o) |  |  |  |
|  |  | Equity | Preferred Stock, par value $0.01 per share ("Preferred Stock") | 457(o) |  |  |  |
|  |  | Debt | Debt Securities | 457(o) |  |  |  |
|  |  | Other | Warrants | 457(o) |  |  |  |
|  |  | Other | Units | 457(o) |  |  |  |
| Fees to be Paid | 1 | Unallocated (Universal) Shelf |  | 457(o) | $10000000.00 | 0.0001381 | $1381.00 |
| Fees Previously Paid |  |  |  |  |  |  |  |
| **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** |
| Carry Forward Securities |  |  |  |  |  |  |  |
|  |  |  | Total Offering Amounts: | Total Offering Amounts: | $10000000.00  |  | $1381.00  |
|  |  |  | Total Fees Previously Paid:  | Total Fees Previously Paid:  |  |  | $0.00  |
|  |  |  | Total Fee Offsets:  | Total Fee Offsets:  |  |  | $0.00  |
|  |  |  | Net Fee Due:  | Net Fee Due:  |  |  | $1381.00  |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Offering Note** <br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>1</sup> (1) Calculated pursuant to 457(o) under the Securities Act of 1933, as amended, based on the proposed maximum aggregate offering price. (2) The registrant previously registered securities at an aggregate offering price not to exceed $50,000,000 on a Registration Statement on Form S-3 (File No. 333-294296), which was filed by the registrant on March 13, 2026 and declared effective on March 23, 2026 (the "Prior Registration Statement"). In accordance with Rule 462(b) under the Securities Act of 1933, as amended, and General Instruction IV.A of Form S-3, an additional number of securities having a proposed maximum aggregate offering price of $10,000,000 is hereby registered on this Registration Statement on Form S-3 (the "Registration Statement"), representing no more than 20% of the maximum aggregate offering price of unsold securities under the Prior Registration Statement. In no event will the maximum aggregate offering price of all securities issued pursuant to this Registration Statement and the Prior Registration Statement exceed that registered under such registration statements.

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| |
|:---|
| |
| **Rules 457(b) and 0-11(a)(2)** |
| Fee Offset Claims |
| Fee Offset Sources |
| **Rule 457(p)** |
| Fee Offset Claims |
| Fee Offset Sources |

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