Amtech Prices Underwritten Public Offering of Common Stock

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The company has also granted to the underwriter a 30-day option to acquire an additional 158,250 shares to cover overallotments in connection with the offering. After the underwriting discount and estimated offering expenses payable by the company, the company expects to receive net proceeds of approximately $9.3 million, assuming no exercise of the overallotment option. The offering is expected to close on August 23, 2017, subject to customary closing conditions.

Roth Capital Partners is acting as sole manager for the offering.

The Company plans to use the net proceeds of the offering for general corporate purposes, which may include working capital, capital expenditures and potential acquisitions.

The shares described above are being offered by Amtech Systems, Inc. pursuant to a registration statement previously filed with and subsequently declared effective by the Securities and Exchange Commission. A prospectus supplement relating to the offering will be filed with the SEC and will be available on the SEC’s website at http://www.sec.gov.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy any of the securities described herein, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. Copies of the preliminary prospectus supplement and accompanying base prospectus relating to this offering may be obtained from Roth Capital Partners, 888 San Clemente Drive, Suite 400, Newport Beach, CA 92660, (800) 678-9147 or by accessing the SEC’s website, www.sec.gov.

About Amtech Systems, Inc.

Amtech Systems, Inc. is a global supplier of advanced thermal processing equipment to the solar, semiconductor / electronics, and LED manufacturing markets. Amtech’s equipment includes diffusion, ALD and PECVD systems and solder reflow systems. Amtech also supplies wafer handling automation and polishing equipment and related consumable products. The Company’s wafer handling, thermal processing and consumable products currently address the diffusion, oxidation, and deposition steps used in the fabrication of solar cells, LEDs, semiconductors, MEMS, printed circuit boards, semiconductor packaging, and the polishing of newly sliced sapphire and silicon wafers. Amtech’s products are recognized under the leading brand names Tempress SystemsTM, Bruce TechnologiesTM, PR HoffmanTM, R2D AutomationTM, SoLayTec, and BTU International.

Safe Harbor / Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 regarding the proposed public offering and the intended use of proceeds from the offering. The offering is subject to market and other conditions and there can be no assurance as to whether or when the offering may be completed or as to the actual size or terms of the offering. These forward-looking statements are subject to risks and uncertainties that may cause actual results to differ materially, including market conditions, risks associated with the cash requirements of our business and other risks detailed from time to time in our filings with the Securities and Exchange Commission, and represent our views only as of the date they are made and should not be relied upon as representing our views as of any subsequent date. We do not assume any obligation to update any forward-looking statements.