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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1171500	Platinum Underwriters Holdings Ltd	PTP	Fire, Marine & Casualty Insurance (6331)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1241471	E Michael Lombardozzi	The Belvedere Building 69 Pitts Bay Road, 2Nd Floor Pembroke D0 HM O8	Exec. Vp, Gen. Coun.and Cao	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Shares	Acquisiton	2010-07-23	58,510	$22.50	235,011	No	4	M	Direct
Common Shares	Disposition	2010-07-23	58,510	$39.59	176,501	No	4	S	Direct
Common Shares	Acquisiton	2010-07-26	16,490	$22.50	192,991	No	4	M	Direct
Common Shares	Disposition	2010-07-26	16,490	$39.59	176,501	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Shares	Non-qualified Stock Option (Right to Buy)	Disposition	2010-07-23	58,510	$0.00	58,510	$22.50
Common Shares	Non-qualified Stock Option (Right to Buy)	Disposition	2010-07-26	16,490	$0.00	16,490	$22.50

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
16,490		2012-10-31	No	4	M	Direct
0		2012-10-31	No	4	M	Direct

Footnotes

This transaction was executed in multiple trades at prices ranging from $39.59 to $39.68. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes, upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
The option vested in four equal annual installments beginning on November 1, 2003.