Form 3 - Initial statement of beneficial ownership of securities

POWER OF ATTORNEY The undersigned hereby constitutes and appoints Brad A. Kopetsky, Secretary of Northern Trust Corporation, a Delaware corporation (the "Corporation"), Deann M. Bogner, Assistant Secretary of the Corporation, Tanya Igess, Assistant Secretary of the Corporation, and David A. Serna, Assistant Secretary of the Corporation, as the undersigned’s true and lawful attorney-in-fact to: (1) execute for and on behalf of the undersigned, in the undersigned’s capacity as an executive officer of the Corporation, Forms 3, 4, 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder and Form 144 under Rule 144 under the Securities Act of 1933; (2) do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, 5, or 144 and complete and execute any amendment or amendments thereto, and timely file any such form with the U.S. Securities and Exchange Commission and any stock exchange or similar 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 such attorney-in- fact’s discretion. The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned 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 such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause or have caused to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys- in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Corporation assuming, any of the undersigned’s responsibilities to comply with Section 16 of the Securities Exchange Act of 1934 or Rule 144 promulgated pursuant to the Securities Act of 1933. This Power of Attorney shall supersede any power of attorney previously granted by the undersigned with respect to the subject matter herein and shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, 5 and 144 with respect to the undersigned’s holdings of, and transactions in, securities issued by the Corporation, unless earlier revoked by the undersigned in a signed document delivered to the Corporation. IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 18th day of September, 2024. /s/ Kelley Conway Kelley Conway

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