Amtech Systems, Inc. ("Amtech") (NASDAQ:ASYS), a manufacturer of equipment and consumables enabling AI semiconductor device packaging and advanced substrate fabrication, today announced that it is set to join the broad-market Russell 3000 Index and the small-cap Russell 2000 Index at the conclusion of the Russell US Indexes annual reconstitution, effective after the US equity markets open on June 29, 2026, according to a preliminary list of additions posted by FTSE Russell on May 22, 2026 as part of the first 2026 Russell indexes reconstitution.

The June reconstitution of the Russell US indexes captures up to the 4,000 largest US stocks as of April 30, ranking them by total market capitalization. Membership in the Russell 3000 Index, which remains in place for half a year beginning 2026, means automatic inclusion in the small-cap Russell 2000 Index as well as the appropriate growth and value style indexes. FTSE Russell determines membership for its Russell indexes primarily by objective, market-capitalization rankings and style attributes.

"The preliminary inclusion in the Russell 3000 and 2000 Indexes -- determined before our oversubscribed capital raise in early June -- marks a pivotal milestone for Amtech," said Mr. Bob Daigle, Chief Executive Officer of Amtech. "The inclusion serves as a testament to our continued commitment to driving value for our shareholders. We appreciate the investment community recognizing our successful 2-year turnaround, our continued profitable growth, and our position as the global standard for AI semiconductor packaging and advanced substrate fabrication technologies."

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for active investment strategies. According to data as of the end of June 2025, about $12.2 trillion in assets are benchmarked against the Russell US indexes, which belong to FTSE Russell, the global index provider. For more information on the Russell 3000^®Index and the Russell indexes reconstitution, go to the "Russell Reconstitution" section on the FTSE Russell website.

About Amtech Systems, Inc.

Amtech Systems, Inc. (NASDAQ:ASYS) provides equipment, consumables and services for AI semiconductor device packaging and advanced wafer substrate fabrication. Our products include advanced packaging and electronics assembly equipment for applications such as AI GPUs and advanced automotive electronics. Consumable and other solutions are used in fabricating semiconductor devices, such as silicon carbide (SiC) and silicon (Si) power devices, digital and analog devices, power electronic packages, advanced semiconductor packages and electronic assemblies. We sell these products to semiconductor device and module manufacturers worldwide, particularly in Asia, North America and Europe. To learn more about Amtech, please visit our website at https://www.amtechsystems.com.

Cautionary Note Regarding Forward-Looking Statements

Certain information contained in this press release is forward-looking in nature. All statements in this press release, or made by management of Amtech Systems, Inc. and its subsidiaries ("Amtech"), other than statements of historical fact, are hereby identified as "forward-looking statements" (as such term is defined in Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of 1995). The forward-looking statements in this press release relate only to events or information as of the date on which the statements are made in this press release. Examples of forward-looking statements include statements regarding Amtech's future financial results, delivering profitable growth, creating long-term value for our shareholders, long term future prospects, operating results, business strategies, projected costs, the optimization and reduction of structural costs, products under development, competitive positions, plans and objectives of Amtech and its management for future operations, efforts to improve operational efficiencies and effectiveness and profitably grow our revenue, and enhancements to our technologies and expansion of our product portfolio. In some cases, forward-looking statements can be identified by terminology such as "may," "plan," "anticipate," "seek," "will," "expect," "intend," "estimate," "believe," "continue," "predict," "potential," "project," "should," "would," "could", "likely," "future," "target," "forecast," "goal," "observe," and "strategy" or the negative of these terms or other comparable terminology used in this press release or by our management, which are intended to identify such forward-looking statements. These statements are not guarantees of future performance and involve risks, uncertainties and assumptions that are difficult to predict. The Form 10-K that Amtech filed with the Securities and Exchange Commission (the "SEC") for the most recently completed fiscal year-ended September 30, listed various important factors that could affect the Company's future operating results and financial condition and could cause actual results to differ materially from historical results and expectations based on forward-looking statements made in this document or elsewhere by Amtech or on its behalf. These factors can be found under the heading "Risk Factors" in the Form 10-K and in our subsequently filed Quarterly Reports on Form 10-Qs, and investors should refer to them. Because it is not possible to predict or identify all such factors, any such list cannot be considered a complete set of all potential risks or uncertainties. Except as required by law, we undertake no obligation to publicly update forward-looking statements, whether as a result of new information, future events, or otherwise.

Amtech Systems may use its website (www.amtechsystems.com), investor relations page (https://www.amtechsystems.com/investors), and LinkedIn page (https://www.linkedin.com/company/amtechsystems) to disclose material non-public information and for complying with its disclosure obligations under Regulation FD. Accordingly, investors and other interested parties should monitor these sites, in addition to following Amtech Systems press releases, Securities and Exchange Commission (SEC) filings, public conference calls and public presentations/webcasts.

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Investor Relations Contact:

Darrow Associates

Jordan Darrow

631-766-4528

jdarrow@darrowir.com

Amtech Systems to be Added to the Russell 3000® and Russell 2000® Indexes