MWP Markwest Hydrocarbon,

CUSIP No.  570762104

1.

Names of Reporting Persons
John Fox

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
United States of America

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
111,092 shares

6.

Shared Voting Power
5,267,727 shares, of which 224,638 share are held jointly by Mr. Fox and his spouse, 4,842,387 shares are directly owned by MWHC  Holding, Inc. (“MWHC Holding”), 118,000 shares are directly owned by the Fox Family Foundation, 81,250 shares are directly owned by the Brian T. Crabtree Trust (“Crabtree Trust”) and 1,452 shares are directly owned by Bode Blanco, L.L.C. (“Bode Blanco”).  Mr. Fox is a director and executive officer of MWHC Holding, the president of the Fox Family Foundation, the trustee of the Crabtree Trust and a member of Bode Blanco.  Mr. Fox may be deemed to have shared power to vote all of these shares.  Mr. Fox disclaims beneficial ownership of shares reported herein, except to the extent of any pecuniary interest therein.  The MaggieGeorge Foundation for which certain family members of Mr. Fox are directors, holds 121,035 shares in the aggregate which are not included in the shares for which Mr. Fox shares voting power.  Mr. Fox disclaims beneficial ownership of the shares held in the MaggieGeorge Foundation.

7.

Sole Dispositive Power
111,092 shares

8.

Shared Dispositive Power
5,267,727 shares, of which 224,638 share are held jointly by Mr. Fox and his spouse, 4,842,387 shares are directly owned by MWHC  Holding, 118,000 shares are directly owned by the Fox Family Foundation, 81,250 shares are directly owned by the Crabtree Trust and 1,452 shares are directly owned by Bode Blanco.  Mr. Fox is a director and executive officer of MWHC Holding, the president of the Fox Family Foundation, the trustee of the Crabtree Trust and a member of Bode Blanco.  Mr. Fox may be deemed to have shared dispositive power with respect to these shares.  Mr. Fox disclaims beneficial ownership of shares reported herein, except to the extent of any pecuniary interest therein.  The MaggieGeorge Foundation for which certain family members of Mr. Fox are directors, holds 121,035 shares in the aggregate which are not included in the shares for which Mr. Fox shares dispositive power.  Mr. Fox disclaims beneficial ownership of the shares held in the MaggieGeorge Foundation.

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
5,378,819 shares

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
44.8%

12.

Type of Reporting Person (See Instructions)
IN, HC

CUSIP No.  570762104

1.

Names of Reporting Persons
MWHC Holding, Inc.

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
Colorado

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
4,842,387

6.

Shared Voting Power
0

7.

Sole Dispositive Power
4,842,387

8.

Shared Dispositive Power
0

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
4,842,387

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
40.3%

12.

Type of Reporting Person (See Instructions)
CO

Item 1.

(a)

Name of Issuer
Markwest Hydrocarbon, Inc.

(b)

Address of Issuer’s Principal Executive Offices
1515 Arapahoe Street, Tower 2, Suite 700

Denver, Colorado 80202

Item 2.

(a)

Name of Person Filing
(1) John Fox

(2) MWHC Holding, Inc.

(b)

Address of Principal Business Office or, if none, Residence
(1) c/o 155 Inverness Drive West, Suite 330, Englewood, Colorado 80112

(2) c/o 155 Inverness Drive West, Suite 330, Englewood, Colorado 80112

(c)

Citizenship
Each filing person’s citizenship or place of organization is set forth on the cover page and incorporated by reference herein.

(d)

Title of Class of Securities
Common Stock, par value $0.01 per share.

(e)

CUSIP Number
570762104

Item 3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

o

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b)

o

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

o

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)

o

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e)

o

An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)

o

An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g)

o

A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);

(h)

o

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

o

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

o

Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Item 4.

Ownership

See rows 5 through 11 of the cover pages, which information is incorporated herein by reference.

Item 5.

Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following   o .

Item 6.

Ownership of More than Five Percent on Behalf of Another Person

Not applicable.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person

Not applicable.

Item 8.

Identification and Classification of Members of the Group

Not applicable.

Item 9.

Notice of Dissolution of Group

Not applicable.

Item 10.

Certification

Not applicable.

Date: February 14, 2008

/s/ John Fox

John Fox

MWHC Holding, Inc.

By:

/s/ John Fox

Name: John Fox

Title: President

Exhibit No.

Description

1

Agreement of Joint Filing