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 * DENNING STEVEN A   2. Issuer Name and Ticker or Trading Symbol IHS Inc. [IHS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) GENERAL ATLANTIC SERVICE COMPANY, LLC, 3 PICKWICK PLAZA 3. Date of Earliest Transaction (Month/Day/Year) 04/21/2008 (Street) GREENWICH, CT 06830 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 Class A Common Stock 04/21/2008   S   530,743 D $ 65.05 2,735,409 (6) I See Footnote (1) Class A Common Stock 04/21/2008   S   153,733 D $ 65.05 2,735,409 (6) I See Footnote (2) Class A Common Stock 04/21/2008   S   50,179 D $ 65.05 2,735,409 (6) I See Footnote (3) Class A Common Stock 04/21/2008   S   9,846 D $ 65.05 2,735,409 (6) I See Footnote (4) Class A Common Stock 04/21/2008   J   7,590 D (5) 2,735,409 (6) I See Footnote (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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
DENNING STEVEN A GENERAL ATLANTIC SERVICE COMPANY, LLC 3 PICKWICK PLAZA GREENWICH, CT 06830	X

Signatures

/s/ Steven A. Denning		04/23/2008
**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)	By General Atlantic Partners, 82, L.P. ("GAP 82"). See footnote 6.
(2)	By GAP-W, LLC ("GAP-W"). See footnote 6.
(3)	By GAP Coinvestments III, LLC ("GAPCO III"). See footnote 6.
(4)	By GAP Coinvestments IV, LLC ("GAPCO IV"). See footnote 6.
(5)	Distribution of shares of Class A Common Stock to certain limited partners of GAPCO III.
(6)	Amount of securities beneficially owned following April 21, 2008 reported transactions represents 1,712,777 shares owned by GAP 82, 186,429 shares owned by GAPCO III, 31,775 shares owned by GAPCO IV and 804,428 shares owned by GAP-W. General Atlantic LLC ("GA LLC") is the general partner of GAP 82 and the manager of GAP-W. The Managing Directors of GA LLC are Managing Members of GAPCO III and GAPCO IV. Mr. Denning is Chairman and a Managing Director of GA LLC and a Managing Member of each of GAPCO III and GAPCO IV, and disclaims beneficial ownership of all shares reported herein except to the extent of his pecuniary interest in such shares.

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