UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.    )

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☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Under Section 240.14a-12

NORTHERN TRUST CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Your Vote Counts! NORTHERN TRUST CORPORATION 2021 Annual Meeting Vote by April 19, 2021 11:59 PM ET NORTHERN TRUST CORPORATION 50 SOUTH LASALLE STREET CHICAGO, IL 60603 D36567-P48615-Z78941 You invested in NORTHERN TRUST CORPORATION and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on April 20, 2021. Get informed before you vote View the Notice and Proxy Statement and Annual Report on Form 10-K online OR you can receive a free paper copy of voting material(s) by requesting prior to April 6, 2021. If you would like to request a copy of the voting material(s), you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Vote Virtually at the Meeting* Point your camera here and April 20, 2021 10:30 a.m. CDT vote without entering a control number Virtually at: www.virtualshareholdermeeting.com/NTRS2021 *Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. V1

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Board Recommends 1. Election of 13 Directors Nominees: 1a. Linda Walker Bynoe For 1b. Susan Crown For 1c. Dean M. Harrison For 1d. Jay L. Henderson For 1e. Marcy S. Klevorn For 1f. Siddharth N. (Bobby) Mehta For 1g. Michael G. O’Grady For 1h. Jose Luis Prado For 1i. Thomas E. Richards For 1j. Martin P. Slark For 1k. David H. B. Smith, Jr. For 1l. Donald Thompson For 1m. Charles A. Tribbett III For 2. Approval, by an advisory vote, of the 2020 compensation of the Corporation’s named executive officers. For 3. Ratification of the appointment of KPMG LLP as the Corporation’s independent registered public accounting firm for the fiscal year ending December 31, 2021. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”.