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 * GTCR CAPITAL PARTNERS L P   2. Issuer Name and Ticker or Trading Symbol SYNIVERSE HOLDINGS INC [SVR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O GTCR GOLDER RAUNER, L.L.C., 6100 SEARS TOWER 3. Date of Earliest Transaction (Month/Day/Year) 03/28/2005 (Street) CHICAGO, IL 60606 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 03/28/2005   C(1)   147,083 A $ 16 647,772 D (3)

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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

Class A Cumulative Redeemable Preferred Stock

(1)

03/28/2005

C(2)

1,665.59

(1)(4)

(5)

Common Stock

147,083

$ 1,413.05

0

D (3)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GTCR CAPITAL PARTNERS L P C/O GTCR GOLDER RAUNER, L.L.C. 6100 SEARS TOWER CHICAGO, IL 60606		X
GTCR MEZZANINE PARTNERS LP C/O GTCR GOLDER RAUNER, L.L.C. 6100 SEARS TOWER CHICAGO, IL 60606		X
GTCR PARTNERS VI L P C/O GTCR GOLDER RAUNER, L.L.C. 6100 SEARS TOWER CHICAGO, IL 60606		X
GTCR GOLDER RAUNER LLC 6100 SEARS TOWER CHICAGO, IL 60606		X

Signatures

/s/ Jody S. Gale under a Power of Attorney filed on 2/9/05		03/28/2005
**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)	Each share of Class A Cumulative Redeemable Preferred Stock converted into the number of shares of Common Stock obtained by dividing (1) the sum of (a) $1,000 and (b) any accrued and unpaid dividends through February 9, 2005 by (2) the per share initial public offering price of the Common Stock, which is $16.00.
(2)	Pursuant to the Issuer's Second Amended and Restated Certificate of Incorporation, each share of Class A Cumulative Redeemable Preferred Stock that was not redeemed with the proceeds from the Issuer's initial public offering of Common Stock was converted into Common Stock on March 28, 2005.
(3)	GTCR Capital Partners, L.P. ("Capital Partners") is the direct beneficial owner of the shares reported in Table II. GTCR Mezzanine Partners, L.P. ("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 Golder Rauner, L.L.C. ("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 II. Mezzanine Partners, GTCR Partners VI and GTCR expressly disclaim beneficial ownership of the shares reported in Table II. The filing of this form shall not be deemed an admission that Mezzanine Partners or GTCR Partners VI or GTCR is, for Section 16 purposes or otherwise, the beneficial owner of such shares.
(4)	Immed.
(5)	Not Applicable

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