UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
UniSource Energy Corporation
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(Name of Issuer)
Common Stock, No Par Value Per Share
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(Title of Class of Securities)
909205106
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(CUSIP Number)
September 23, 2002
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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:
/X/ Rule 13d-1(b)
/ / Rule 13d-1(c)
/ / Rule 13d-1(d)
(Continued on following page(s))
CUSIP NO. 909205106
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1. Names of Reporting Persons
I.R.S. Identification Nos. of above persons (entities only)
WHITE MOUNTAINS INSURANCE GROUP, LTD. (NO. 94-2708455)
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2. Check the Appropriate Box if a Member of a Group (See Instructions)
(a) / /
(b) / /
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3. SEC Use Only
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4. Citizenship or Place of Organization
BERMUDA
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Number of Shares 5. Sole Voting Power
Beneficially Owned by
Each Reporting Person 0
With: ----------------------------------------------------
6. Shared Voting Power
2,018,100*
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7. Sole Dispositive Power
0
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8. Shared Dispositive Power
2,018,100*
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9. Aggregate Amount Beneficially Owned by Each Reporting Person
2,018,100*
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10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) / /
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11. Percent of Class Represented by Amount in Row (9)
6.3%
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12. Type of Reporting Person (See Instructions)
HC, CO
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* The reporting person directly controls no shares of the common stock of
UniSource Energy Corporation ("UniSource Shares") and indirectly
controls, through various wholly-owned subsidiaries and certain of its
employee benefit plans (as further described herein), 2,018,100
UniSource Shares.
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CUSIP NO. 909205106
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1. Names of Reporting Persons
I.R.S. Identification Nos. of above persons (entities only)
ONEBEACON ASSET MANAGEMENT COMPANY (NO. 04-6140276)
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2. Check the Appropriate Box if a Member of a Group (See Instructions)
(a) / /
(b) / /
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3. SEC Use Only
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4. Citizenship or Place of Organization
DELAWARE
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Number of Shares 5. Sole Voting Power
Beneficially Owned by
Each Reporting Person 2,018,100**
With: ----------------------------------------------------
6. Shared Voting Power
0
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7. Sole Dispositive Power
2,018,100**
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8. Shared Dispositive Power
0
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9. Aggregate Amount Beneficially Owned by Each Reporting Person
2,018,100**
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10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) / /
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11. Percent of Class Represented by Amount in Row (9)
6.3%
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12. Type of Reporting Person (See Instructions)
IA, CO
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* The shares are beneficially owned by OneBeacon Insurance Company
(200,000 shares), The Camden Fire Insurance Association (800,000
shares), Folksamerica Reinsurance Company (138,100 shares) and certain
employee benefit plans sponsored by Folksamerica Reinsurance Company
(100,000 shares) and OneBeacon Insurance Company (780,000 shares).
Through an investment advisory agreement, OneBeacon Asset Management
Company has sole voting and dispositive power over such shares.
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ITEM 1.
(a) NAME OF ISSUER
UniSource Energy Corporation
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(b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
One South Church Avenue, Suite 100, Tucson, AZ 85701
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ITEM 2.
(a), (b), (c) NAME OF PERSON FILING, ADDRESS OF PRINCIPAL BUSINESS OFFICE
AND CITIZENSHIP
This statement is being filed by White Mountains Insurance Group, Ltd.,
a Bermuda corporation ("WMIG"), and OneBeacon Asset Management Company
("OBAM"), a Delaware corporation (collectively the "Filing Persons"). WMIG is
a property and casualty insurance holding company and OBAM is a registered
investment advisor.
The address of the principal executive office of WMIG is 80 South Main
Street, Hanover, NH 03755. The address of the principal executive office of
OBAM is 370 Church Street, Guilford, CT 06437.
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(d) Title of Class of Securities
Common Stock (no par value)
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(e) CUSIP Number
909205106
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ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SECTIONS 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
Act (15 U.S.C. 78o)
(b) / / Bank as defined in section 3(a)(6) of the Act
(15 U.S.C. 78c)
(c) / / Insurance company as defined in section 3(a)(19) of
the 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) /X/(1) An investment adviser in accordance with Section
240.13d-1(b)(1)(ii)(E)
(f) / / An employee benefit plan or endowment fund in accordance
with Section 240.13d-1(b)(1)(ii)(F)
(g) /X/(2) A parent holding company or control person in accordance
with Section 240.13d-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 Section 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:
2,018,100*** shares.
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(b) Percent of Class:
6.3%
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(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote
0
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(ii) Shared power to vote or to direct the vote
2,018,100***
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(iii) Sole power to dispose or to direct the disposition of
0
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(iv) Shared power to dispose or to direct the disposition of
2,018,100***
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*** The reporting person directly controls no shares of the
common stock of UniSource Energy Corporation ("UniSource
Shares") and indirectly controls, through various
wholly-owned subsidiaries and certain of its employee
benefit plans (as further described herein), 2,018,100
UniSource Shares.
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(1) OBAM is filing as an investment advisor herein.
(2) WMIG is filing as a parent holding company herein.
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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. / /
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
OneBeacon Insurance Company, The Camden Fire Insurance Association and
Folksamerica Reinsurance Company are insurance companies as defined in
Section 3(a)(19) of the Act (15 U.S.C. 78c). The employee benefit plans
sponsored by Folksamerica Reinsurance Company and OneBeacon Insurance Company
are employee benefit plans as defined in Section 240.13d-1(b)(l)(ii)(F.)
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
Not applicable.
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
Not applicable.
ITEM 10. CERTIFICATION
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired and are held
in the ordinary course of business and 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 that purpose or effect.
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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 5, 2003
WHITE MOUNTAINS INSURANCE GROUP, LTD.
by: /s/ J. Brian Palmer
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Name: J. Brian Palmer
Title: Chief Accounting Officer
ONEBEACON ASSET MANAGEMENT COMPANY
by: /s/ Maribel C. Friend
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Name: Maribel C. Friend
Title: Chief Operating Officer
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