UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 5)*
IHS INC
(Name of Issuer)
COMMON STOCK
(Title of Class of Securities)
451734107
(CUSIP Number)
December 31, 2011
(Date of Event which Requires Filing of Statement)
Check the appropriate box to designate the Rule pursuant
to which this Schedule is filed:
[x] Rule 13d - 1(b)
Rule 13d - 1(c)
Rule 13d - 1(d)
*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing
information which would alter disclosures provided in a prior cover page.
The information required on the remainder of this page shall
not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or
otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however,
see the Notes.)
(Continued on following page(s)
Page 1 of 6 Pages
CUSIP NO. 451734107 13G Page
2 of 6
1 Name of Reporting Person
S.S. or I.R.S.
Identification No. of Above Person
T. ROWE PRICE
ASSOCIATES, INC.
52-0556948
2 Check the Appropriate Box
if a Member of a Group*
(a) ____
NOT APPLICABLE (b)
____
3 SEC
Use Only
______________________________
4 Citizenship
or Place of Organization
MARYLAND
Number of 5 Sole Voting Power
**
Shares 1,117,670
Beneficially 6 Shared Voting
Power
**
Owned By Each -0-
Reporting 7 Sole Dispositive
Power
**
Person 4,940,170
With 8 Shared Dispositive
Power
-0-
9 Aggregate
Amount Beneficially Owned by Each Reporting Person
4,940,170
10 Check
Box if the Aggregate Amount in Row (9) Excludes Certain Shares*
NOT APPLICABLE
11 Percent of Class Represented
by Amount in Row 9
7.5%
12 Type of Reporting Person*
IA
*SEE INSTRUCTION BEFORE FILLING
OUT!
**Any shares reported in Items
5 and 6 are also
reported in Item 7.
CUSIP NO. 451734107 13G Page
3 of 6 Pages
1 Name of Reporting Person
S.S. or I.R.S.
Identification No. of Above Person
T. ROWE PRICE MID-CAP GROWTH FUND
52-1784828
2 Check the Appropriate Box
if a Member of a Group*
(a) ____
NOT APPLICABLE (b)
____
3 SEC
Use Only
______________________________
4 Citizenship
or Place of Organization
Maryland
Number of 5 Sole Voting Power
**
Shares 3,350,000
Beneficially 6 Shared Voting
Power
**
Owned By Each NONE
Reporting 7 Sole Dispositive
Power
**
Person NONE
With 8 Shared Dispositive
Power
NONE
9 Aggregate
Amount Beneficially Owned by Each Reporting Person
3,350,000
10 Check
Box if the Aggregate Amount in Row (9) Excludes Certain Shares*
NOT APPLICABLE
11 Percent of Class Represented
by Amount in Row 9
5.1%
12 Type of Reporting Person*
IV
*SEE INSTRUCTION BEFORE FILLING
OUT!
**The aggregate amount reported
on this page is also included in the aggregate amount reported by T. Rowe Price Associates, Inc. on page 2 of this Schedule 13G.
SCHEDULE 13G
PAGE 4 OF 6
Item 1(a) Name of Issuer:
Reference
is made to page 1 of this Schedule 13G
Item 1(b) Address of Issuer's
Principal Executive Offices:
15 INVERNESS WAY EAST, ENGLEWOOD,
CO
80112
Item 2(a) Name of Person(s)
Filing:
(1) T.
Rowe Price Associates, Inc. ("Price Associates")
(2) T.
Rowe Price Mid-Cap Growth Fund, Inc.
X
Attached as Exhibit A is a copy of an agreement between the Persons Filing (as specified hereinabove) that this Schedule 13G
is being filed on behalf of each of them.
Item 2(b) Address of Principal
Business Office:
100 E. Pratt
Street, Baltimore, Maryland 21202
Item 2(c) Citizenship or Place
of Organization:
(1) Maryland
(2) Maryland
Item 2(d) Title of Class of
Securities:
Reference
is made to page 1 of this Schedule 13G
Item 2(e) CUSIP Number: 451734107
Item 3 The person filing this
Schedule 13G is an:
X Investment
Adviser registered under Section 203 of the Investment Advisers Act of 1940
X
Investment Company registered under Section 8 of the Investment Company Act of 1940
Item
4 Reference is made to Items 5-11 on page 2 of this Schedule 13G.
SCHEDULE 13G PAGE
5 OF 6
Item 5 Ownership of Five Percent
or Less of a Class.
X Not Applicable.
This
statement is being filed to report the fact that, as of the date of this report, the reporting person(s)has (have) ceased to be
the beneficial owner of more than five percent of the class of securities.
Item
6 Ownership of More than Five Percent on Behalf of Another Person
(1) Price
Associates does not serve as custodian of the assets of any of its clients; accordingly, in each instance only the client or the
client's custodian or trustee bank has the right to receive dividends paid with respect to, and proceeds from the sale of, such
securities.
The ultimate power to
direct the receipt of dividends paid with respect to, and the proceeds from the sale of, such securities, is vested in the individual
and institutional clients which Price Associates serves as investment adviser. Any and all discretionary authority which has been
delegated to Price Associates may be revoked in whole or in part at any time
Except as may be indicated
if this is a joint filing with one of the registered investment companies sponsored by Price Associates which it also serves as
investment adviser ("T. Rowe Price Funds"), not more than 5% of the class of such securities is owned by any one client
subject to the investment advice of Price Associates.
(2) With
respect to securities owned by any one of the T. Rowe Price Funds, only State Street Bank and Trust Company, as custodian for each
of such Funds, has the right to receive dividends paid with respect to, and proceeds from the sale of, such securities. No other
person is known to have such right, except that the shareholders of each such Fund participate proportionately in any dividends
and distributions so paid.
Item
7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.
Not Applicable.
Item
8 Identification and Classification of Members of the Group.
Not Applicable.
SCHEDULE 13G
PAGE 6 OF 6
Item 9 Notice of Dissolution
of Group.
Not Applicable.
Item
10 Certification.
By signing below I
(we) certify that, to the best of my (our) knowledge and belief, the securities referred to above were acquired in the ordinary
course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of
the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purpose
or effect. T. Rowe Price Associates, Inc. hereby declares and affirms that the filing of Schedule 13G shall not be construed as
an admission that Price Associates is the beneficial owner of the securities referred to, which beneficial ownership is expressly
denied.
Signature.
After reasonable inquiry
and to the best of my (our) knowledge and belief, I (we) certify that the information set forth in this statement is true, complete
and correct.
Dated: February 14, 2012 Dated: February
14, 2012
T. ROWE PRICE MID-CAP GROWTH T.
ROWE PRICE ASSOCIATES, INC.
FUND, INC.
By: /s/ David Oestreicher By: /s/
David Oestreicher
David Oestreicher, David
Oestreicher,
Vice President Vice
President
Note: This
Schedule 13G, including all exhibits, must be filed with the Securities and Exchange Commission, and a copy hereof must be sent
to the issuer by registered or certified mail not later than February 14th following the calendar year covered by the statement
or within the time specified in Rule 13d-1(b)(2), if applicable.
12/31/2011
EXHIBIT A
AGREEMENT
JOINT FILING OF SCHEDULE 13G
T. Rowe Price
Associates, Inc. (an investment adviser registered under the Investment Advisers Act of 1940) and T. Rowe Price Mid-Cap Growth
Fund, Inc., a Maryland corporation, hereby agree to file jointly the statement on Schedule 13G to which this Agreement is attached,
and any amendments thereto which may be deemed necessary, pursuant to Regulation 13D-G under the Securities Exchange Act of 1934.
It is understood
and agreed that each of the parties hereto is responsible for the timely filing of such statement and any amendments thereto, and
for the completeness and accuracy of the information concerning such party contained therein, but such party is not responsible
for the completeness or accuracy of information concerning the other party unless such party knows or has reason to believe that
such information is inaccurate.
It is understood
and agreed that a copy of this Agreement shall be attached as an exhibit to the statement on Schedule 13G, and any amendments hereto,
filed on behalf of each of the parties hereto.
Dated: February 14, 2012 Dated: February
14, 2012
T. ROWE PRICE MID-CAP GROWTH T.
ROWE PRICE ASSOCIATES, INC.
FUND, INC.
By: /s/ David Oestreicher By: /s/
David Oestreicher
David Oestreicher, David
Oestreicher,
Vice President Vice
President
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