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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1. Name and Address of Reporting Person * Donnini David   2. Issuer Name and Ticker or Trading Symbol SYNIVERSE HOLDINGS INC [SVR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O SYNIVERSE HOLDINGS, INC., 8125 HIGHWOODS PALM WAY 3. Date of Earliest Transaction (Month/Day/Year) 05/20/2008 (Street) TAMPA, FL 33647 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 Common Stock, par value $0.001 per share 05/20/2008   J(1)   3,770,302 (2) D $ 0 6,519,395 (2) (3) I See footnote (7) Common Stock, par value $0.001 per share 05/20/2008   J(1)   1,882,577 (2) D $ 0 3,255,249 (2) (4) I See footnote (8) Common Stock, par value $0.001 per share 05/20/2008   J(1)   51,752 (2) D $ 0 89,487 (2) (5) I See footnote (9) Common Stock, par value $0.001 per share 05/20/2008   J(1)   95,369 (2) D $ 0 164,908 (2) (6) I See footnote (10)

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

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Donnini David C/O SYNIVERSE HOLDINGS, INC. 8125 HIGHWOODS PALM WAY TAMPA, FL 33647	X	X

Signatures

/s/ Jody S. Gale under a Power of Attorney		05/22/2008
**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)	Reflects a pro rata distribution of such shares by the fund to its partners.
(2)	The Reporting Person expressly disclaims beneficial ownership of the shares reported in Table I, except to the extent of his pecuniary interest therein. The filing of this form shall not be deemed an admission that the Reporting Person is, for Section 16 purposes or otherwise, the beneficial owner of such shares.
(3)	Excludes 565,808 shares, which is the number of shares in column 4 that were distributed to GTCR Partners VII, L.P. ("GTCR Partners VII"), the general partner of GTCR Fund VII, L.P. ("Fund VII"). The distribution of shares from Fund VII to GTCR Partners VII was exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), promulgated by Rule 16a-13 thereunder.
(4)	Excludes 366,795 shares, which is the number of shares in column 4 that were distributed to GTCR Partners VII, the general partner of GTCR Fund VII/A, L.P. ("Fund VII/A"). The distribution of shares from Fund VII/A to GTCR Partners VII was exempt from Section 16 of the Exchange Act, promulgated by Rule 16a-13 thereunder.
(5)	Excludes 8,995 shares, which is the number of shares in column 4 that were distributed to GTCR Golder Rauner, L.L.C. ("GTCR"), the general partner of GTCR Co-Invest, L.P. ("Co-Invest"). The distribution of shares from Co-Invest to GTCR was exempt from Section 16 of the Exchange Act, promulgated by Rule 16a-13 thereunder.
(6)	Excludes 2,119 shares, which is the number of shares in column 4 that were distributed to GTCR Mezzanine Partners, L.P. ("Mezzanine Partners"), the general partner of GTCR Capital Partners, L.P. ("Capital Partners"). The distribution of shares from Capital Partners to Mezzanine Partners was exempt from Section 16 of the Exchange Act, promulgated by Rule 16a-13 thereunder.
(7)	Fund VII is the direct beneficial owner of the shares reported in this row of Table I. GTCR Partners VII is the general partner of Fund VII and GTCR is the general partner of GTCR Partners VII. As such, GTCR Partners VII and GTCR may be deemed to be beneficial owners of the shares reported in Table I. GTCR is managed by its members. The Reporting Person is a member of GTCR and GTCR Partners VII and may be deemed to have an indirect pecuniary interest in the issuer's common stock owned by Fund VII to the extent of the Reporting Person's indirect proportionate interest in Fund VII.
(8)	Fund VII/A is the direct beneficial owner of the shares reported in this row of Table I. GTCR Partners VII is the general partner of Fund VII/A and GTCR is the general partner of GTCR Partners VII. As such, GTCR Partners VII and GTCR may be deemed to be beneficial owners of the shares reported in Table I. GTCR is managed by its members. The Reporting Person is a member of GTCR and GTCR Partners VII and may be deemed to have an indirect pecuniary interest in the issuer's common stock owned by Fund VII/A to the extent of the Reporting Person's indirect proportionate interest in Fund VII/A.
(9)	Co-Invest is the direct beneficial owner of the shares reported in this row of Table I. GTCR is the general partner of Co-Invest. As such, GTCR may be deemed to be a beneficial owner of the shares reported in Table I. GTCR is managed by its members. The Reporting Person is a member of GTCR and may be deemed to have an indirect pecuniary interest in the issuer's common stock owned by Co-Invest to the extent of the Reporting Person's indirect proportionate interest in Co-Invest.
(10)	Capital Partners is the direct beneficial owner of the shares reported in this row of Table I. Mezzanine Partners is the general partner of Capital Partners. GTCR Partners VI, L.P. ("GTCR Partners VI") is the general partner of Mezzanine Partners. GTCR is the general partner of GTCR Partners VI. As such, Mezzanine Partners, GTCR Partners VI and GTCR may be deemed to be beneficial owners of the shares reported in Table I. GTCR is managed by its members. The Reporting Person is a member of GTCR, Mezzanine Partners and GTCR Partners VI and may be deemed to have an indirect pecuniary interest in the issuer's common stock owned by Capital Partners to the extent of the Reporting Person's indirect proportionate interest in Capital Partners.

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