Exhibit 99.4
December 19, 2014
Board of Directors
Amtech Systems, Inc.
131 South Clark Drive
Tempe, Arizona 85281
Members of the Board:
We hereby consent to the inclusion of our opinion letter, dated October 20, 2014, to the Board of Directors of Amtech Systems, Inc. (“Amtech”) as Annex B to, and to any reference thereto, in the amended joint proxy statement/prospectus relating to the proposed merger involving Amtech and BTU International, Inc., which joint proxy statement/prospectus forms a part of Amtech’s Amendment No. 1 to Registration Statement on Form S-4 to which this consent is filed as an exhibit. In giving the foregoing consent, we do not admit (1) that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended (the “Securities Act”), or the rules and regulations of the Securities and Exchange Commission (the “Commission”) promulgated thereunder, or (2) that we are experts with respect to any part of the Registration Statement within the meaning of the term “experts” as used in the Securities Act and the rules and regulations of the Commission promulgated thereunder.
Very truly yours,
/s/ STIFEL, NICOLAUS & COMPANY, INCORPORATED
STIFEL, NICOLAUS & COMPANY, INCORPORATED
787 7th AVENUE, 11TH FLOOR I NEW YORK, NEW YORK 10019 (212) 847-6680 I WWW.ST1FEL.COM