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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from_ to NORTHERN TRUST CORPORATION ( Exact name of registrant as specified in its charter ) Commission File No. 001-36609 Delaware ( State or other jurisdiction of incorporation or organization ) 50 South La Salle Street Chicago , Illinois ( Address of principal executive offices ) Title of Each Class Common Stock , $ 1.66 2/3 Par Value Depositary Shares , each representing 1 / 1,000th interest in a share of Series E Non - Cumulative Perpetual Preferred Stock Registrant's telephone number , including area code : ( 312 ) 630-6000 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol NTRS NTRSO ( I.R.S. Employer Identification No. ) X 36-2723087 Securities registered pursuant to Section 12 ( g ) of the Act : None 60603 ( Zip Code ) Name of Each Exchange On Which Registered The NASDAQ Stock Market LLC The NASDAQ Stock Market LLC No □ No 区 Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes Indicate by check mark whether the registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes > No □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes > No Accelerated filer Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , ” “ smaller reporting company , ” and “ emerging growth company ” in Rule 12b - 2 of the Exchange Act . Large accelerated filer Non - accelerated filer Smaller reporting company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Emerging growth company Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . » Indicate by check mark whether the registrant is a shell company ( as defined in Exchange Act Rule 12b - 2 ) . Yes No The aggregate market value of the registrant's common stock as of June 30 , 2020 ( the last business day of the registrant's most recently completed second quarter ) , based upon the last sale price of the common stock at June 30 , 2020 as reported by The NASDAQ Stock Market LLC , held by non - affiliates was approximately $ 16.4 billion . Determination of stock ownership by non - affiliates was made solely for the purpose of responding to this requirement and the registrant is not bound by this determination for any other purpose . At January 31 , 2021 , 208,314,381 shares of common stock , $ 1.66 2/3 par value , were outstanding . Portions of the registrant's Proxy Statement for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III hereof .