<SEC-DOCUMENT>0000080255-12-000302.txt : 20120210
<SEC-HEADER>0000080255-12-000302.hdr.sgml : 20120210
<ACCEPTANCE-DATETIME>20120210144657
ACCESSION NUMBER:		0000080255-12-000302
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20120210
DATE AS OF CHANGE:		20120210

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IDEX CORP /DE/
		CENTRAL INDEX KEY:			0000832101
		STANDARD INDUSTRIAL CLASSIFICATION:	PUMPS & PUMPING EQUIPMENT [3561]
		IRS NUMBER:				363555336
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-40334
		FILM NUMBER:		12592122

	BUSINESS ADDRESS:	
		STREET 1:		1925 WEST FIELD COURT
		CITY:			LAKE FOREST
		STATE:			IL
		ZIP:			60045
		BUSINESS PHONE:		8474987070

	MAIL ADDRESS:	
		STREET 1:		1925 WEST FIELD COURT
		CITY:			LAKE FOREST
		STATE:			IL
		ZIP:			60045

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PRICE T ROWE ASSOCIATES INC /MD/
		CENTRAL INDEX KEY:			0000080255
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY & COMMODITY BROKERS, DEALERS, EXCHANGES & SERVICES [6200]
		IRS NUMBER:				520556948
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		100 EAST PRATT ST
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202
		BUSINESS PHONE:		(410)345-6603

	MAIL ADDRESS:	
		STREET 1:		P.O. BOX 89000
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21289
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>iex13gadec11.htm
<DESCRIPTION>IEX AS OF 12/31/11
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 11pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">UNITED STATES</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">SECURITIES AND EXCHANGE COMMISSION</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">Washington, D.C. 20549</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-align: center">SCHEDULE 13G</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">Under the Securities Exchange Act of 1934</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">(Amendment No. 6)*</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0">&nbsp;&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">IDEX CORP</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center; text-indent: 0.5in">(Name of Issuer)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-align: center">COMMON STOCK</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center; text-indent: 0.5in">(Title of Class of Securities)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-align: center">45167R104</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-align: center">(CUSIP Number)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-align: center">December 31, 2011</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-align: center">(Date of Event which Requires Filing of Statement)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0">Check the appropriate box to designate the Rule pursuant
to which this Schedule is filed:</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0">[x] Rule 13d - 1(b)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-indent: 0.5in">Rule 13d - 1(c)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-indent: 0.5in">Rule 13d - 1(d)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0">&nbsp;</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0">*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.</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0">The information required on the remainder of this page shall
not be deemed to be &quot;filed&quot; for the purpose of Section 18 of the Securities Exchange Act of 1934 (&quot;Act&quot;) 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.)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 9pt 0 0; text-align: center">(Continued on following page(s)</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0">&#9;Page 1 of 6 Pages</P>

<!-- Field: Page; Sequence: 1 -->
    <DIV STYLE="margin-bottom: 6pt">&nbsp;</DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt">&nbsp;</DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">CUSIP NO. 45167R104&#9; 13G&#9;Page
2 of 6 </FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">1&#9;Name of Reporting Person</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">S.S. or I.R.S.
Identification No. of Above Person</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">T. ROWE PRICE
ASSOCIATES, INC.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">52-0556948</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">2&#9;Check the Appropriate Box
if a Member of a Group*</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 400.75pt"><FONT STYLE="line-height: 84%">(a) ____</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">NOT APPLICABLE&#9;(b)
____</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">3&#9;SEC
Use Only</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">______________________________</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">4&#9;Citizenship
or Place of Organization</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">MARYLAND</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Number of&#9;5&#9;Sole Voting Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 112.75pt"><FONT STYLE="line-height: 84%">**&#9;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Shares&#9; 2,281,555</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Beneficially&#9;6&#9;Shared Voting
Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 112.75pt"><FONT STYLE="line-height: 84%">**</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Owned By Each&#9; -0-</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Reporting&#9;7&#9;Sole Dispositive
Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 112.75pt"><FONT STYLE="line-height: 84%">**</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Person&#9; 8,208,810</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">With&#9;8&#9;Shared Dispositive
Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 112.75pt"><FONT STYLE="line-height: 84%">-0-</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">9&#9;Aggregate
Amount Beneficially Owned by Each Reporting Person</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 400.75pt"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">8,208,810</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">10&#9;Check
Box if the Aggregate Amount in Row (9) Excludes Certain Shares*</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">NOT APPLICABLE</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">11&#9;Percent of Class Represented
by Amount in Row 9</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">9.8%</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">12&#9;Type of Reporting Person*</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">IA</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&#9;*SEE INSTRUCTION BEFORE FILLING
OUT!</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&#9;**Any shares reported in Items
5 and 6 are also</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&#9;reported in Item 7.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<!-- Field: Page; Sequence: 2 -->
    <DIV STYLE="margin-bottom: 6pt">&nbsp;</DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt">&nbsp;</DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">CUSIP NO. 45167R104&#9;13G&#9;Page
3 of 6 Pages</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">1&#9;Name of Reporting Person</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">S.S. or I.R.S.
Identification No. of Above Person</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 0.35in">T. ROWE PRICE MID-CAP GROWTH FUND</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 0.35in">52-1784828</P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">2&#9;Check the Appropriate Box
if a Member of a Group*</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 400.75pt"><FONT STYLE="line-height: 84%">(a) ____</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">NOT APPLICABLE&#9;(b)
____</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">3&#9;SEC
Use Only</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">______________________________</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">4&#9;Citizenship
or Place of Organization</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">Maryland
</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Number of&#9;5&#9;Sole Voting Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 112.75pt"><FONT STYLE="line-height: 84%">**</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Shares&#9; 4,750,000</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Beneficially&#9;6&#9;Shared Voting
Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 112.75pt"><FONT STYLE="line-height: 84%">**</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Owned By Each&#9;NONE</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Reporting&#9;7&#9;Sole Dispositive
Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 112.75pt"><FONT STYLE="line-height: 84%">**</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Person&#9;NONE</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">With&#9;8&#9;Shared Dispositive
Power</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 134.35pt"><FONT STYLE="line-height: 84%">NONE</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">9&#9;Aggregate
Amount Beneficially Owned by Each Reporting Person</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">4,750,000</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 26.35pt; text-indent: -26.35pt"><FONT STYLE="line-height: 84%">10&#9;Check
Box if the Aggregate Amount in Row (9) Excludes Certain Shares*</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">NOT APPLICABLE</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">11&#9;Percent of Class Represented
by Amount in Row 9</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">5.6%</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">12&#9;Type of Reporting Person*</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 26.35pt"><FONT STYLE="line-height: 84%">IV</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&#9;*SEE INSTRUCTION BEFORE FILLING
OUT!</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">**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.</FONT></P>

<!-- Field: Page; Sequence: 3 -->
    <DIV STYLE="margin-bottom: 6pt">&nbsp;</DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt">&nbsp;</DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">SCHEDULE 13G</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">PAGE 4 OF 6 </FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 1(a)&#9;Name of Issuer:</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 76.75pt"><FONT STYLE="line-height: 84%">Reference
is made to page 1 of this Schedule 13G</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 1(b)&#9;Address of Issuer's
Principal Executive Offices:</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 10pt Courier New, Courier, Monospace; margin: 0 0 0 1in"><FONT STYLE="font-size: 12pt">630 DUNDEE RD, NORTHBROOK,
</FONT><FONT STYLE="font-size: 10pt">IL</FONT><FONT STYLE="font-size: 12pt"> 60062</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 2(a)&#9;Name of Person(s)
Filing:</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 112.75pt; text-indent: -0.5in"><FONT STYLE="line-height: 84%">(1)&#9;T.
Rowe Price Associates, Inc. (&quot;Price Associates&quot;)</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 76.75pt"><FONT STYLE="line-height: 84%">(2)&#9;T.
Rowe Price Mid-Cap Growth Fund, Inc. </FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 76.75pt; text-indent: -76.75pt"><FONT STYLE="line-height: 84%">X
&#9;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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 2(b)&#9;Address of Principal
Business Office:</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 76.75pt"><FONT STYLE="line-height: 84%">100 E. Pratt
Street, Baltimore, Maryland 21202</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 2(c)&#9;Citizenship or Place
of Organization:</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 76.75pt"><FONT STYLE="line-height: 84%">(1)&#9;Maryland</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 76.75pt"><FONT STYLE="line-height: 84%">(2)&#9;Maryland</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 2(d)&#9;Title of Class of
Securities:</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 76.75pt"><FONT STYLE="line-height: 84%">Reference
is made to page 1 of this Schedule 13G</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 2(e)&#9;CUSIP Number: 45167R104
</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">Item 3&#9;The person filing this
Schedule 13G is an:</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 76.75pt; text-indent: -76.75pt"><FONT STYLE="line-height: 84%">X&#9;Investment
Adviser registered under Section 203 of the Investment Advisers Act of 1940</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 76.75pt; text-indent: -76.75pt"><FONT STYLE="line-height: 84%">X
&#9;Investment Company registered under Section 8 of the Investment Company Act of 1940</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 76.75pt; text-indent: -76.75pt"><FONT STYLE="line-height: 84%">Item
4&#9;Reference is made to Items 5-11 on page 2 of this Schedule 13G.</FONT></P>

<!-- Field: Page; Sequence: 4 -->
    <DIV STYLE="margin-bottom: 6pt">&nbsp;</DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt">&nbsp;</DIV>
    <!-- Field: /Page -->

<P STYLE="font: normal 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">SCHEDULE 13G&#9; &#9;PAGE
5 OF 6&#9;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 85%">Item 5&#9;Ownership of Five Percent
or Less of a Class.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 85%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 0.75in"><FONT STYLE="line-height: 85%">X&#9;Not Applicable.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 85%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 0.75in; text-indent: -0.75in"><FONT STYLE="line-height: 85%">&#9;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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 0.8in; text-indent: -0.8in"><FONT STYLE="line-height: 77%">Item
6&#9;Ownership of More than Five Percent on Behalf of Another Person</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 86.6pt; text-indent: -0.4in"><FONT STYLE="line-height: 77%">(1)&#9;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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 86.6pt"><FONT STYLE="line-height: 77%">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</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 86.6pt"><FONT STYLE="line-height: 77%">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 (&quot;T. Rowe Price Funds&quot;), not more than 5% of the class of such securities is owned by any one client
subject to the investment advice of Price Associates.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 86.6pt; text-indent: -0.4in"><FONT STYLE="line-height: 77%">(2)&#9;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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 57.8pt; text-indent: -57.8pt"><FONT STYLE="line-height: 77%">Item
7&#9;Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 57.8pt"><FONT STYLE="line-height: 77%">Not Applicable.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 57.8pt; text-indent: -57.8pt"><FONT STYLE="line-height: 77%">Item
8&#9;Identification and Classification of Members of the Group.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 57.8pt; text-indent: -57.8pt"><FONT STYLE="line-height: 77%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 57.8pt"><FONT STYLE="line-height: 77%">Not Applicable.</FONT></P>

<!-- Field: Page; Sequence: 5 -->
    <DIV STYLE="margin-bottom: 6pt">&nbsp;</DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt">&nbsp;</DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 55.15pt"><FONT STYLE="line-height: 84%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 84%">SCHEDULE 13G</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">PAGE 6 OF 6 </FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">Item 9&#9;Notice of Dissolution
of Group.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 69.55pt"><FONT STYLE="line-height: 88%">Not Applicable.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 69.55pt; text-indent: -69.55pt"><FONT STYLE="line-height: 88%">Item
10&#9;Certification.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 69.55pt"><FONT STYLE="line-height: 88%">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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&#9;Signature.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 69.55pt"><FONT STYLE="line-height: 88%">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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">Dated:&#9;February 14, 2012&#9;Dated:&#9;February
14, 2012</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">T. ROWE PRICE MID-CAP GROWTH &#9;T.
ROWE PRICE ASSOCIATES, INC.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 55.15pt"><FONT STYLE="line-height: 88%">FUND, INC.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">By:&#9;/s/ David Oestreicher &#9;By:&#9;/s/
David Oestreicher </FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 33.55pt"><FONT STYLE="line-height: 88%">David Oestreicher,&#9;David
Oestreicher,</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 33.55pt"><FONT STYLE="line-height: 88%">Vice President&#9;Vice
President</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0 0 0 69.55pt; text-indent: -69.55pt"><FONT STYLE="line-height: 88%">Note:&#9;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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">12/31/2011</FONT></P>

<!-- Field: Page; Sequence: 6 -->
    <DIV STYLE="margin-bottom: 6pt">&nbsp;</DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt">&nbsp;</DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">EXHIBIT A</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&#9;AGREEMENT</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&#9;JOINT FILING OF SCHEDULE 13G</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 40.75pt"><FONT STYLE="line-height: 88%">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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 40.75pt"><FONT STYLE="line-height: 88%">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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 40.75pt"><FONT STYLE="line-height: 88%">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.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">Dated:&#9;February 14, 2012&#9;Dated:&#9;February
14, 2012</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">T. ROWE PRICE MID-CAP GROWTH &#9;T.
ROWE PRICE ASSOCIATES, INC.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 55.15pt"><FONT STYLE="line-height: 88%">FUND, INC.</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">By:&#9;/s/ David Oestreicher &#9;By:&#9;/s/
David Oestreicher </FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 33.55pt"><FONT STYLE="line-height: 88%">David Oestreicher,&#9;David
Oestreicher,</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0; text-indent: 33.55pt"><FONT STYLE="line-height: 88%">Vice President&#9;Vice
President</FONT></P>

<P STYLE="font: 12pt Courier New, Courier, Monospace; margin: 0"><FONT STYLE="line-height: 88%">&nbsp;</FONT></P>


<P STYLE="margin: 0"></P>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
