POWER OF ATTORNEY

For Executing Forms 3, 4 and 5 Pursuant to Section 16a
of the Securities Exchange Act


	Know all by these presents, that the undersigned hereby
	constitutes and appoints each of Kathleen M. Cronin,
	Margaret Austin Wright and Mary Croft signing singly,
	hisher true and lawful attorney-in-fact to:

	1 execute for and on behalf of the undersigned
	Forms 3, 4 and 5 and amendments thereto in accordance
	with Section 16a of the Securities Exchange Act of
	1934 and the rules thereunder;

	2 do and perform any and all acts for and on behalf
	of the undersigned which may be necessary or desirable
	to complete the execution of any such Form 3, 4 and 5
	and the timely filing of such form with the United States
	Securities and Exchange Commission and any other authority; and

	3 take any other action of any type whatsoever in connection
	with the foregoing which, in the opinion of such attorney-in-fact,
	 may be of benefit to, in the best interest of, or legally required by,
	the undersigned, it being understood that the documents executed by such
	attorney-in-fact on behalf of the undersigned pursuant to this Power of
	Attorney shall be in such form and shall contain such terms and
	conditions as such attorney-in-fact may approve in hisher discretion.

       The undersigned hereby grants to each such attorney-in-fact full
	power and authority to do and perform all and every act
	and thing whatsoever requisite, necessary and proper
	to be done in the exercise of any of the rights and
	powers herein granted, as fully to all intents and
	purposes as such attorney-in-fact might or could do
	if personally present, with full power of substitution
	or revocation, hereby ratifying and confirming all
	that such attorney-in-fact, or hisher substitute or
	substitutes, shall lawfully do or cause to be done
	by virtue of this power of attorney and the rights
	and powers herein granted.  The undersigned acknowledges
	that the foregoing attorney-in-fact, in serving in such
	capacity at the request of the undersigned, are not
	assuming any of the undersigneds responsibilities to
	comply with Section 16 of the Securities Exchange Act of 1934.

       This Power of Attorney shall remain in full force and
	effect until the undersigned is no longer required to
	file Forms, 3, 4, and 5 with respect to the undersigneds
	holdings of and transactions in securities issued by the Company,
	unless earlier revoked by the undersigned in a signed writing
	delivered to the foregoing attorneys-in-fact.

       IN WITNESS WHEREOF, the undersigned has caused this
	Power of Attorney to be executed as of this 15th
	day of June, 2011.


   				Signature:  Ronald A. Pankau


				Print Name: Ronald A. Pankau