Edgar Filing: Flagstone Reinsurance Holdings Ltd

Ownership Submission

FORM 4

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person ^*

PRESTIA GARY

2. Issuer Name and Ticker or Trading Symbol
Flagstone Reinsurance Holdings Ltd [FSR]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

_____ Director	_____ 10% Owner
__X__ Officer (give title below)	_____ Other (specify below)
Chief Underwriting Officer-NA

(Last)

(First)

(Middle)

FLAGSTONE REINSURANCE HOLDINGS LIMITED, CRAWFORD HOUSE, 23 CHURCH STREET

3. Date of Earliest Transaction (Month/Day/Year)
05/01/2007

(Street)

HAMILTON, D0 HM 11

4. If Amendment, Date Original Filed(Month/Day/Year)

6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

(City)

(State)

(Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security
(Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code
(Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date
(Month/Day/Year)

7. Title and Amount of Underlying Securities
(Instr. 3 and 4)

8. Price of Derivative Security
(Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)

11. Nature of Indirect Beneficial Ownership
(Instr. 4)

Code

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Performance Share Units

$ 0 ⁽¹⁾

05/01/2007

15,000

12/31/2009⁽²⁾

03/31/2010⁽³⁾

Common Shares

15,000 ⁽⁴⁾

$ 0 ⁽¹⁾

155,000

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
PRESTIA GARY FLAGSTONE REINSURANCE HOLDINGS LIMITED CRAWFORD HOUSE, 23 CHURCH STREET HAMILTON, D0 HM 11			Chief Underwriting Officer-NA

Signatures

/s/Gary Prestia		05/02/2007
^**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Vesting of Performance Share Units ("PSUs") is contingent upon the issuer meeting certain fully diluted return-on-equity ("FDROE") goals. Upon vesting, the PSU holder shall be entitled to receive a number of common shares of the issuer (or the cash equivalent, at the election of the issuer) equal to the product of the number of PSUs granted multiplied by a factor based on the issuer's FDROE during the vesting period. The factor will range between zero and two, depending on the FDROE achieved during the vesting period.
(2)	These PSUs would vest, subject to the contingency described in note 1 above and the other terms and conditions of the issuer's PSU Plan, on the date shown.
(3)	Assumes the issuer will settle these PSUs within three months of the vesting date.
(4)	Represents the mid-point of the vesting range described in note 1 above for these PSUs.

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