================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q/A [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 1996 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM _________ TO __________ COMMISSION FILE NUMBER 1-11566 MARKWEST HYDROCARBON, INC. (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER) DELAWARE 84-1352233 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 5613 DTC PARKWAY, ENGLEWOOD, COLORADO 80111 (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: 303-290-8700 Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) Yes X No -- --, and (2) has been subject to such filing requirements for the past 90 days, Yes No X -- -- The registrant had 8,485,000 shares of common stock, $.01 per share par value, outstanding as of October 31, 1996. =============================================================================== 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. MarkWest Hydrocarbon, Inc. (Registrant) Date: November 21, 1996 BY: /s/ Brian T. O'Neill --------------------------------- Brian T. O'Neill Senior Vice President, and Chief Operating Officer BY: /s/ Faye E. McGuar --------------------------------- Faye E. McGuar Chief Accounting Officer 12