-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, HYcHyIIyXTsn3h50DULJWq1tXFCZGcCRqAY7slcJBfieIl8tnyBLrDpUPOK1Gw53 XK/HcgcGCiS/jVcJupnetw== 0001047469-04-032900.txt : 20041102 0001047469-04-032900.hdr.sgml : 20041102 20041102162142 ACCESSION NUMBER: 0001047469-04-032900 CONFORMED SUBMISSION TYPE: 8-K PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20041027 ITEM INFORMATION: Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers FILED AS OF DATE: 20041102 DATE AS OF CHANGE: 20041102 FILER: COMPANY DATA: COMPANY CONFORMED NAME: MARKWEST HYDROCARBON INC CENTRAL INDEX KEY: 0001019756 STANDARD INDUSTRIAL CLASSIFICATION: CRUDE PETROLEUM & NATURAL GAS [1311] IRS NUMBER: 841352233 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 8-K SEC ACT: 1934 Act SEC FILE NUMBER: 001-14841 FILM NUMBER: 041113622 BUSINESS ADDRESS: STREET 1: 155 INVERNESS DRIVE WEST STREET 2: SUITE 200 CITY: ENGLEWOOD STATE: CO ZIP: 80112-5004 BUSINESS PHONE: 3032908700 MAIL ADDRESS: STREET 1: 155 INVERNESS DRIVE WEST STREET 2: SUITE 200 CITY: ENGLEWOOD STATE: CO ZIP: 80112-5004 8-K 1 a2145963z8-k.htm 8-K
QuickLinks -- Click here to rapidly navigate through this document

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 27, 2004

MARKWEST HYDROCARBON, INC.
(Exact name of registrant as specified in its charter)

Delaware   001-14841   84-1352233
(State or other jurisdiction of
incorporation or organization)		   (Commission
File Number)		   (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):

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 5.02. Departure of Directors or Principal Officer; Election of Directors; Appointment of Principal Officers

(d)
Appointment of New Director

        Effective October 27, 2004, Mrs. Anne E. Fox Mounsey was appointed to the board of directors of MarkWest Hydrocarbon, Inc. ("MarkWest") to replace Arthur J. Denney, who resigned from the board of directors on September 1, 2004. Ms. Mounsey is the daughter of John M. Fox, a director and the chairman of the board of MarkWest. From 1991 to 2003, Ms. Mounsey held various positions with MarkWest, her most recent as Manager of Marketing and Business Development. A 1989 graduate of Southern Methodist University, Ms. Mounsey also holds a Master of Finance degree from the University of Colorado.

2


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: November 2, 2004
 
By:
 
/s/  JAMES G. IVEY      
James G. Ivey
 Chief Financial Officer

3



QuickLinks

SIGNATURE
 -----END PRIVACY-ENHANCED MESSAGE-----