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) October 17, 2005

MARKWEST HYDROCARBON, INC.

(Exact name of registrant as specified in its charter)

Delaware	001-14841	84-1352233
(State or other jurisdiction of	(Commission File Number)	(I.R.S. Employer
incorporation or organization)		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):

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

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

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

o Pre-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 17, 2005 MarkWest Hydrocarbon, Inc. (the “Company”), provided a progress report on the Company’s previously announced Plan of Action to bring it back into compliance with the American Stock Exchange’s (the “Exchange”) listing requirements by October 15, 2005. The Company is currently not in compliance with the continued listing standards as set forth in Sections 134, 1101 and 1003(d) of the Amex Company Guide for failure to file with the Securities and Exchange Commission (the “SEC”) its Annual Report on Form 10-K for the year ended December 31, 2004 and its Quarterly Reports on Form 10-Q for the three months ended March 31, 2005 and June 30, 2005 by the prescribed filing deadline.

The Company is in the final stages of preparation for the Form 10-K and the Forms 10-Q/A and anticipates filing those reports by October 21, 2005.

The Company continues to work to complete the Forms 10-Q for the first, second and third quarter of 2005. The timing has been impacted by the Company changing its independent auditor, reported in a Form 8-K filing dated September 23, 2005. The Company will file these reports on a sequential basis as soon as each Form 10-Q has been completed.

Item 9.01. Financial Statement and Exhibits

Exhibit No.		Description of Exhibit

99.1		Press Release, dated October 17, 2005 – MarkWest Hydrocarbon Announces Progress on Plan of Action.

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 hereunto duly authorized.

	MARKWEST HYDROCARBON, INC.
	(Registrant)


Dated: October 21, 2005	By:	/s/ JAMES G. IVEY
			James G. Ivey
			Chief Financial Officer

Exhibit 99.1

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

MARKWEST HYDROCARBON ANNOUNCES PROGRESS ON PLAN OF ACTION

DENVER—October 17, 2005—MarkWest Hydrocarbon, Inc. (AMEX: MWP) (the “Company”), today provided a progress report on the Company’s previously announced Plan of Action to bring it back into compliance with the American Stock Exchange’s (the “Exchange”) listing requirements by October 15, 2005. The Company is currently not in compliance with the continued listing standards of the Exchange as a result of the Company’s failure to timely file certain Form 10-Ks and Form 10-Qs (the “SEC Filings”) with the Securities Exchange Commission (“SEC”). The Plan of Action establishes a schedule for the Company to complete and file its Annual Report on Form 10-K for year ended December 31, 2004, and its restated financial statements, Forms 10-Q/A for the first three quarters of 2004, and its Quarterly Reports on Form 10-Q for the first and second quarters of 2005.

The Company is in the final stages of preparation for the Form 10-K and the Forms 10-Q/A and anticipates filing those reports by October 21, 2005. The Company is planning a conference call next week to discuss the 2004 fourth quarter results.

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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.