UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

o

Rule 13d-1(b)

o

Rule 13d-1(c)

ý

Rule 13d-1(d)

CUSIP No. 456727 10 6

1.

Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only)
Warburg, Pincus Ventures, L.P. (I.R.S. Identification No. 13-3784037)

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

ý

3.

SEC Use Only

4.

Citizenship or Place of Organization
Delaware

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
0

6.

Shared Voting Power 
0

7.

Sole Dispositive Power 
0

8.

Shared Dispositive Power
0

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
0

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
0%

12.

Type of Reporting Person (See Instructions)
PN

CUSIP No. 456727 10 6

1.

Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only)
Warburg Pincus & Co. (I.R.S. Identification No. 13-6358475)

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

ý

3.

SEC Use Only

4.

Citizenship or Place of Organization
New York

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
0

6.

Shared Voting Power 
0

7.

Sole Dispositive Power 
0

8.

Shared Dispositive Power
0

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
0

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
0%

12.

Type of Reporting Person (See Instructions)
PN

CUSIP No. 456727 10 6

1.

Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only)
Warburg Pincus LLC (I.R.S. Identification No. 13-4069737)

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

ý

3.

SEC Use Only

4.

Citizenship or Place of Organization
New York

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
0

6.

Shared Voting Power 
0

7.

Sole Dispositive Power 
0

8.

Shared Dispositive Power
0

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
0

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
0%

12.

Type of Reporting Person (See Instructions)
00

Item 1.

(a)

Name of Issuer
The name of the issuer is Information Holdings Inc. (the “Company”).

(b)

Address of Issuer’s Principal Executive Offices
2777 Summer Street
Suite 602
Stamford, Connecticut 06905.

Item 2.

(a)

Name of Person Filing

(b)

Address of Principal Business Office or, if none, Residence

(c)

Citizenship

This Amendment No. 4 to Schedule 13G (“Amendment No. 4”) amends the Schedule 13G filed on February 9, 1999, and as amended on February 14, 2001, March 12, 2002 and February 13, 2003 (the “Schedule 13G”), with respect to the Common Stock (as defined in Item 2(d) below) of the Company and is filed by and on behalf (a) Warburg, Pincus Ventures, L.P. a Delaware limited partnership (“WPV”); (b) Warburg, Pincus & Co., a New York general partnership (“WP”); and (c) Warburg Pincus LLC, a New York limited liability company (“WP LLC”), which manages WPV (collectively, the “Reporting Persons”).  The business address of each of the foregoing is 466 Lexington Avenue, New York, New York 10017.

(d)

Title of Class of Securities
Common Stock, $0.01 par value per share (“Common Stock”)

(e)

CUSIP Number
456727 10 6

Item 3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

o

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b)

o

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

o

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)

o

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).

(e)

o

An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)

o

An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g)

o

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h)

o

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

o

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)

o

Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Not Applicable

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.

WPV

(a)

Amount beneficially owned:   

0 shares of Common Stock

(b)

Percent of class:   

0%

(c)

Number of shares as to which the person has:

(i)

Sole power to vote or to direct the vote   

0

(ii)

Shared power to vote or to direct the vote    

0

(iii)

Sole power to dispose or to direct the disposition of   

0

(iv)

Shared power to dispose or to direct the disposition of   

0

WP

(a)

Amount beneficially owned:   

0 shares of Common Stock

(b)

Percent of class:   

0%

(c)

Number of shares as to which the person has:

(i)

Sole power to vote or to direct the vote   

0

(ii)

Shared power to vote or to direct the vote    

0

(iii)

Sole power to dispose or to direct the disposition of   

0

(iv)

Shared power to dispose or to direct the disposition of   

0

WP LLC

(a)

Amount beneficially owned:   

0 shares of Common Stock

(b)

Percent of class:   

0%

(c)

Number of shares as to which the person has:

(i)

Sole power to vote or to direct the vote   

0

(ii)

Shared power to vote or to direct the vote    

0

(iii)

Sole power to dispose or to direct the disposition of   

0

(iv)

Shared power to dispose or to direct the disposition of   

0

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   ý.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person

Not Applicable

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

WPV, WP and WPP LLC are making this simple, joint filing because they may be deemed to constitute a “group” within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended.

Item 9.

Notice of Dissolution of Group

Not Applicable

Item 10.

Certification

Not Applicable

Dated: November 29, 2004

WARBURG, PINCUS VENTURES, L.P.

By: Warburg Pincus & Co., General Partner

By:

/s/ Scott A. Arenare

Name:

Scott A. Arenare

Title:

Partner

WARBURG PINCUS & CO.

By:

/s/ Scott A. Arenare

Name:

Scott A. Arenare

Title:

Partner

WARBURG PINCUS LLC

By:

/s/ Scott A. Arenare

Name:

Scott A. Arenare

Title:

Managing Director