UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )*
Core-Mark Holding Company, Inc.
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(Name of Issuer)
Common Stock, par value $0.01 per share
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(Title of Class of Securities)
218681140
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(CUSIP Number)
December 13, 2005
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(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[_] Rule 13d-1(b)
[X] Rule 13d-1(c)
[_] Rule 13d-1(d)
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* The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
CUSIP No. 218681104
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1. NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Ian G. Wallace
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
(a) [_]
(b) [X]
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
0
6. SHARED VOTING POWER
736,564
7. SOLE DISPOSITIVE POWER
0
8. SHARED DISPOSITIVE POWER
736,564
9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
736,564
10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
INSTRUCTIONS)
[_]
11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
7.4%
12. TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IN
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CUSIP No. 218681104
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1. NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
River Run Management, L.L.C.
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
(a) [_]
(b) [X]
3. SEC USE ONLY
4. CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
5. SOLE VOTING POWER
0
6. SHARED VOTING POWER
736,564
7. SOLE DISPOSITIVE POWER
0
8. SHARED DISPOSITIVE POWER
736,564
9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
736,564
10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
INSTRUCTIONS)
[_]
11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
7.4%
12. TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
OO, IA
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CUSIP No. 218681104
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Item 1(a). Name of Issuer:
Core-Mark Holding Company, Inc.
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(b). Address of Issuer's Principal Executive Offices:
395 Oyster Point Boulevard, Suite 415
South San Francisco, California 94080
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Item 2(a). Names of Persons Filing:
Ian G. Wallace
River Run Management, L.L.C.
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(b). Address of Principal Business Office, or if None, Residence:
Ian G. Wallace River Run Management, L.L.C.
c/o 152 West 57th Street c/o 152 West 57th Street
52nd Floor 52nd Floor
New York, New York 10019 New York, New York 10019
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(c). Citizenship:
Ian G. Wallace - United States of America
River Run Management, L.L.C. - Delaware
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(d). Title of Class of Securities:
Common Stock, par value $0.01 per share
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(e). CUSIP Number:
218681104
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Item 3. If This Statement is filed pursuant to ss.240.13d-1(b) or
240.13d-2(b), or (c), check whether the person filing is a:
(a) [_] Broker or dealer registered under Section 15 of the Exchange
Act (15 U.S.C. 78c).
(b) [_] Bank as defined in Section 3(a)(6) of the Exchange Act (15
U.S.C. 78c).
(c) [_] Insurance company as defined in Section 3(a)(19) of the
Exchange Act (15 U.S.C. 78c).
(d) [_] Investment company registered under Section 8 of the
Investment Company Act of 1940 (15 U.S.C. 80a-8).
(e) [_] An investment adviser in accordance with
s.240.13d-1(b)(1)(ii)(E);
(f) [_] An employee benefit plan or endowment fund in accordance with
s.240.13d-1(b)(1)(ii)(F);
(g) [_] A parent holding company or control person in accordance with
Rule 13d-1(b)(1)(ii)(G);
(h) [_] A savings association as defined in Section 3(b) of the
Federal Deposit Insurance Act (12 U.S.C.1813);
(i) [_] 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) [_] Group, in accordance with s.240.13d-1(b)(1)(ii)(J).
Item 4. Ownership.
Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.
(a) Amount beneficially owned:
Ian G. Wallace - 736,564
River Run Management, L.L.C. - 736,564
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(b) Percent of class:
Ian G. Wallace - 7.4%
River Run Management, L.L.C. - 7.4%
(c) Number of shares as to which the person has:
Ian G. Wallace
(i) Sole power to vote or to direct the vote 0
(ii) Shared power to vote or to direct the vote 736,564
(iii) Sole power to dispose or to direct the disposition of 0
(iv) Shared power to dispose or to direct the disposition of 736,564
River Run Management, L.L.C.
(i) Sole power to vote or to direct the vote 0
(ii) Shared power to vote or to direct the vote 736,564
(iii) Sole power to dispose or to direct the disposition of 0
(iv) Shared power to dispose or to direct the disposition of 736,564
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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 [ ].
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Item 6. Ownership of More Than Five Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power
to direct the receipt of dividends from, or the proceeds from the sale of, such
securities, a statement to that effect should be included in response to this
item and, if such interest relates to more than five percent of the class, such
person should be identified. A listing of the shareholders of an investment
company registered under the Investment Company Act of 1940 or the beneficiaries
of employee benefit plan, pension fund or endowment fund is not required.
Ian G. Wallace is the managing member of River Run
Management, L.L.C. and River Run Capital, L.L.C., both
of which are Delaware limited liability companies that
serve as the investment manager and general partner,
respectively, to, and exercise investment discretion
over the accounts of, a number of investment vehicles.
None of those investment vehicles has beneficial
ownership of 5% or more of the class of Common Stock.
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Item 7. Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on by the Parent Holding Company or Control
Person.
If a parent holding company or Control person has filed this schedule,
pursuant to Rule 13d-1(b)(1)(ii)(G), so indicate under Item 3(g) and attach an
exhibit stating the identity and the Item 3 classification of the relevant
subsidiary. If a parent holding company or control person has filed this
schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating
the identification of the relevant subsidiary.
Not applicable.
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Item 8. Identification and Classification of Members of the Group.
If a group has filed this schedule pursuant to
ss.240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit
stating the identity and Item 3 classification of each member of the group. If a
group has filed this schedule pursuant to ss.240.13d-1(c) or ss.240.13d-1(d),
attach an exhibit stating the identity of each member of the group.
Not applicable.
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Item 9. Notice of Dissolution of Group.
Notice of dissolution of a group may be furnished as an exhibit
stating the date of the dissolution and that all further filings with respect to
transactions in the security reported on will be filed, if required, by members
of the group, in their individual capacity. See Item 5.
Not applicable.
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Item 10. Certification.
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not
held for the purpose of or with the effect of changing or influencing
the control of the issuer of the securities and were not acquired and
are not held in connection with or as a participant in any transaction
having such purpose or effect.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February 10, 2006
/s/ Ian G. Wallace*
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Ian G. Wallace
River Run Management, L.L.C.*
By: /s/ Ian G. Wallace
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Name: Ian G. Wallace
Title: Managing Member
* The Reporting Persons disclaim beneficial ownership in the Common Stock,
except to the extent of their pecuniary interest therein.
The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
this statement, provided, however, that a power of attorney, for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.
Note. Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See s.240.13d-7 for other
parties for whom copies are to be sent.
Attention. Intentional misstatements or omissions of fact constitute federal
criminal violations (see 18 U.S.C. 1001).
Exhibit A
AGREEMENT
The undersigned agree that this Schedule 13G dated December 13, 2006 relating to
the Common Stock, par value $0.01 per share of Core-Mark Holding Company, Inc.,
shall be filed on behalf of the undersigned.
/s/ Ian G. Wallace*
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Ian G. Wallace
River Run Management, L.L.C.*
By: /s/ Ian G. Wallace
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Name: Ian G. Wallace
Title: Managing Member
SK 02642 0001 642338