UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
(Rule 13d-102)
INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13D-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO RULE 13d-2(b)
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO. )(1)
Platinum Underwriters Holdings Limited
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(Name of Issuer)
Common Stock $0.01 Par Value
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(Title of Class of Securities)
G7127P100
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(CUSIP Number)
December 31, 2003
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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)
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(1) 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. G7127P100
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1. Names of Reporting Persons
I.R.S. Identification Nos. of above persons (entities only).
Schroder Investment Management North America Inc.
13-4064414
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2. Check the Appropriate Box if a Member of a Group (See Instructions)
(a) / /
(b) /X/
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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 2,210,000
With ----------------------------------------------------
6. Shared Voting Power
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7. Sole Dispositive Power
2,210,000
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8. Shared Dispositive Power
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9. Aggregate Amount Beneficially Owned by Each Reporting Person
2,210,000
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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)
5.14%
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12. Type of Reporting Person (See Instructions)
IA
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1. Names of Reporting Persons
I.R.S. Identification Nos. of above persons (entities only).
Schroder Investment Management International Ltd.
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2. Check the Appropriate Box if a Member of a Group (See Instructions)
(a) / /
(b) /X/
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3. SEC Use Only
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4. Citizenship or Place of Organization
United Kingdom
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Number of Shares 5. Sole Voting Power
Beneficially Owned by
Each Reporting Person 7,900
With ----------------------------------------------------
6. Shared Voting Power
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7. Sole Dispositive Power
7,900
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8. Shared Dispositive Power
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9. Aggregate Amount Beneficially Owned by Each Reporting Person
7,900
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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)
0.02%
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12. Type of Reporting Person (See Instructions)
IA
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ITEM 1.
(a) Name of Issuer
Platinum Underwriters Holdings Limited
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(b) Address of Issuer's Principal Executive Offices
The Belvedere Building.
69 Pitts Bay Road
Pembroke, Bermuda
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ITEM 2.
(a) Name of Person Filing
Barbara Brooke Manning
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(b) Address of Principal Business Office or, if none, Residence
875 Third Avenue, 22nd Floor
New York, NY 10022
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(c) Citizenship
Delaware
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(d) Title of Class of Securities
Common Stock
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(e) CUSIP Number
G7127P100
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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/ 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) / / 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);
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(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:
2,217,900
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(b) Percent of Class:
5.16%
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(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote
2,217,900
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(ii) Shared power to vote or to direct the vote
0
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(iii) Sole power to dispose or to direct the disposition of
2,217,900
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(iv) Shared power to dispose or to direct the disposition of
0
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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 / /.
Not Applicable
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
There are no other persons with such rights who own more than 5% of
the issuer, except as reported herein.
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
Schroder Investment Management North America Inc. IA
Schroder Investment Management International Ltd. IA
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
Not Applicable
ITEM 10. CERTIFICATION
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(a) The following certification shall be included if the statement is
filed pursuant to Rule 13d-1(b):
"By signing below, I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired 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."
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.
February 12, 2004
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Date
Barbara Brooke Manning
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Signature
Barbara Brooke Manning
Senior Vice President, Director and
Chief Compliance Officer
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Name/Title
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