SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------------------------------- FORM 8-K 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, 2006 ZOLTEK COMPANIES, INC. (Exact name of registrant as specified in its charter) MISSOURI 0-20600 43-1311101 (State or other (Commission File (I.R.S. Employer jurisdiction of Number) Identification organization) Number) 3101 MCKELVEY ROAD ST. LOUIS, MISSOURI 63044 (Address of principal executive offices) (Zip Code) (314) 291-5110 (Registrant's telephone number, including area code) NOT APPLICABLE (Former name or former address if changed since last report) ---------------------------------- 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: [ ] 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)) 1 ITEM 5.02 DEPARTURE OF DIRECTORS OR PRINCIPAL OFFICERS; ELECTION OF DIRECTORS; APPOINTMENT OF PRINCIPAL OFFICERS (b) On July 27, 2006, Zoltek Companies, Inc. issued a press release announcing that John F. McDonnell will resign from Zoltek's board of directors for personal reasons, effective August 1, 2006. The text of the press release is attached hereto as Exhibit 99. ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS. (a) Financial statements of businesses acquired. Not ------------------------------------------- applicable. (b) Pro forma financial information. Not applicable ------------------------------- (c) Exhibits. See Exhibit Index -------- 2 SIGNATURES 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 thereunto duly authorized. Dated: July 28, 2006 ZOLTEK COMPANIES, INC. By /s/ Zsolt Rumy -------------------------------------- Zsolt Rumy Chairman and Chief Executive Officer 3 EXHIBIT INDEX Exhibit Number Description - ------ ----------- 99 Press Release, dated July 27, 2006. 4