================================================================================ SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 27, 2007 ATMI, INC. (Exact name of registrant as specified in its charter) DELAWARE 1-16239 06-1481060 (State or other (Commission file number) (I.R.S. employer jurisdiction of identification no.) incorporation or organization) 7 COMMERCE DRIVE DANBURY, CONNECTICUT 06810 (Address of principal (Zip code) executive offices) Registrant's telephone number, including area code: (203) 794-1100 Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): [_] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [_] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) [_] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) [_] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) ================================================================================ ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS. Explanatory Note. This amendment is being filed to correct the Exhibit Item number for the Amended and Restated Bylaws, which was properly set forth in the Form 8-K filed August 1, 2007, as Exhibit 3.1, but was tagged on EDGAR and labeled in the text of the exhibit as Exhibit 99.1. (d) Exhibits. Exhibit Number Description -------------- ----------- 3.1 Amended and Restated Bylaws of ATMI, Inc. (as adopted July 27, 2007). - -------------------------------------------------------------------------------- SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ATMI, INC. Date: November 30, 2007 By: /s/ Douglas A. Neugold ------------------------------- Douglas A. Neugold Title: Chief Executive Officer and President 2