8-K

UNITED STATES

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) December 1, 2005

MARKWEST HYDROCARBON, INC.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	001-14841 (Commission File Number)	84-1352233 (I.R.S. Employer Identification Number)
155 Inverness Drive West, Suite 200, Englewood, CO 80112-5000 (Address of principal executive offices)

Registrant’s telephone number, including area code: 303-290-8700

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 (see General Instruction A.2. below):

oWritten Communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

oSoliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

oPre-Commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

oPre-Commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 3.01.  NOTICE OF DELISTING OR FAILURE TO SATISFY A CONTINUED LISTING RULE OR STANDARD; TRANSFER OF LISTING.

On October 26, 2005 MarkWest Hydrocarbon Inc. (the “Company”) received a letter from the American Stock Exchange (“AMEX”) advising that AMEX had accepted the Company’s Revised Plan of Action which establishes a schedule for the Company to complete and file its Quarterly Reports on Form 10-Q for the three quarters ended March 31, 2005, June 30, 2005 and September 30, 2005 by November 30, 2005.

On December 1, 2005 the Company announced that it must delay its anticipated completion and filing of its 2005 Quarterly Reports on Form 10-Q with the Securities and Exchange Commission (“SEC”) beyond the November 30, 2005 Revised Plan of Action scheduled date to bring the Company back into compliance with the AMEX listing requirements.  The Company is currently not in compliance with the AMEX requirements as set forth in Sections 134, 1101 and 1003(d) of the Amex Company Guide for failure to file with the SEC its Quarterly Reports on Form 10-Q for the quarters ended March 31, 2005, June 30, 2005 and September 30, 2005 by the prescribed filing deadline and has request for an extension of the filing dates pending with AMEX.  This delay is a result of the Company having to perform additional review and consideration of financial results in order to ensure complete and accurate results in association with the quarterly filings.  The Company has advised AMEX of this delay.

The Company is devoting substantial resources and working with its outside auditors to complete and file the Quarterly Reports on Form 10-Q as soon as reasonably possible and to restore its compliance with the AMEX requirements. The Company intends to file these reports on a sequential basis as soon as each Form 10-Q has been completed.

Item 9.01.  FINANCIAL STATEMENTS AND EXHIBITS.

(c) Exhibits

The exhibit identified below is filed as part of this report:

Exhibit 99.1Press Release of the Progress on Plan of Action dated December 1, 2005.

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SIGNATURE

Pursuant to the requirements of the Securities and 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:  December 6, 2005	By:	/s/ JAMES G. IVEY
		James G. Ivey Chief Financial Officer

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EXHIBIT INDEX

Exhibit No.	Description of Exhibit
99.1	Press Release of the Progress on Plan of Action dated December 1, 2005.

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EX-99.1

Exhibit 99.1

MarkWest Hydrocarbon, Inc.	Contact:	Frank Semple, President & CEO
155 Inverness Drive West, Suite 200		Jim Ivey, CFO
Englewood, CO 80112-5000		Andy Schroeder, VP and Treasurer
(800) 730-8388	Phone:	(303) 290-8700
(303) 290-8700	E-mail:	investorrelations@markwest.com
(303) 290-8769 Fax	Website:	www.markwest.com

MarkWest Hydrocarbon Announces Delayed Filing of its 2005
Quarterly Reports on Form 10-Qs

DENVER-December 1, 2005-MarkWest Hydrocarbon, Inc. (AMEX: MWP) today announced that it must delay its anticipated completion and filing of its Quarterly Reports on Form 10-Q for the first, second and third quarters of 2005 with the Securities and Exchange Commission (“SEC”) beyond the November 30, 2005 Revised Plan of Action scheduled date to bring the Company back into compliance with the American Stock Exchange’s (the “Exchange”) listing requirements.  This delay is a result of the Company having to perform additional review and consideration of financial results in order to ensure complete and accurate results in association with the quarterly filings.  The Company has advised the Exchange of this delay and should be completing this additional review shortly.  The Company intends to file the Quarterly Reports on Form 10-Q for the first, second and third quarters of 2005 as soon as reasonably possible.

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MarkWest Hydrocarbon, Inc. (AMEX: MWP) controls and operates MarkWest Energy Partners, L.P. (AMEX: MWE), a publicly-traded limited partnership engaged in the gathering, processing and transmission of natural gas; the transportation, fractionation and storage of natural gas liquids; and the gathering and transportation of crude oil. We also market natural gas and NGLs.

This press release includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect our operations, financial performance and other factors as discussed in our filings with the Securities and Exchange Commission (“SEC”). Among the factors that could cause results to differ materially are those risks discussed in our Form 10-K for the year ended December 31, 2003, and our Forms 10-Q for 2004, as filed with the SEC.