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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 Title of each class Common shares Ohio ( State or other jurisdiction of incorporation or organization ) 1835 Dueber Avenue SW , Canton , OH ( Address of principal executive offices ) Commission file number : 1-36313 TIMKEN STEEL Large accelerated filer Non - accelerated filer to TIMKENSTEEL CORPORATION ( Exact name of registrant as specified in its charter ) 330.471.7000 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Securities Exchange Act of 1934 : Trading symbol TMST No 风 Securities registered pursuant to Section 12 ( g ) of the Act : None 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 Exchange Act . Yes No 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 D X 46-4024951 ( I.R.S. Employer Identification No. ) 44706 ( Zip Code ) 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 ☐ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer or a smaller reporting company . See the definitions of " large accelerated filer , " " accelerated filer " and " smaller reporting company " in Rule 12b - 2 of the Exchange Act . Name of exchange in which registered New York Stock Exchange Document Proxy Statement for the 2021 Annual Meeting of Shareholders Accelerated filer Smaller reporting company 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 reporting accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . □ DOCUMENTS INCORPORATED BY REFERENCE 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 . > ☐ ☐ X Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No As of June 30 , 2020 , the aggregate market value of the registrant's common stock held by non - affiliates was $ 160,935,221 based on the closing sale price as reported on the New York Stock Exchange for that date . Indicate the number of shares outstanding of each of the issuer's classes of common stock , as of the latest practicable date . Class Common Shares , without par value Outstanding at February 15 , 2021 45,175,486 Parts Into Which Incorporated Part III