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X 0 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 New York ( State of incorporation ) M & T BANK CORPORATION ( Exact name of registrant as specified in its charter ) One M & T Plaza , Buffalo , New York ( Address of principal executive offices ) Commission file number 1-9861 100 Registrant's telephone number , including area code : 716-635-4000 16-0968385 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( b ) of the Act : 14203 ( Zip Code ) Title of Each Class Common Stock , $ .50 par value 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 , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes > No No □ 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 ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No □ Name of Each Exchange on Which Registered New York Stock Exchange 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 Accelerated filer Smaller reporting company Non - accelerated filer Emerging growth 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 . 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 . No | Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes Aggregate market value of the Common Stock , $ 0.50 par value , held by non - affiliates of the registrant , computed by reference to the closing price as of the close of business on June 30 , 2020 : $ 12,939,363,542 . Number of shares of the Common Stock , $ 0.50 par value , outstanding as of the close of business on February 19 , 2021 : 128,636,592 shares . Documents Incorporated By Reference : ( 1 ) Portions of the Proxy Statement for the 2021 Annual Meeting of Shareholders of M & T Bank Corporation in Parts II and III .