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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 For the transition period from : to Commission file number : 01-07698 ACME UNITED CORPORATION ( Exact Name of Registrant as Specified in Its Charter ) Connecticut State or Other Jurisdiction of Incorporation or Organization 55 Walls Drive , Fairfield , Connecticut Address of Principal Executive Offices Registrant's telephone number , including area code : ( 203 ) 254-6060 Title of each class $ 2.50 par value Common Stock Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ACU I.R.S. Employer Identification No. 06-0236700 06824 Zip Code Name of each exchange on which registered NYSE American Securities registered pursuant to Section 12 ( g ) of the Act : None ( Title of Class ) NO " Indicate by check mark whether 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 □ 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 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 ( sec . 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 Accelerated filer > Smaller Reporting Company 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 definitions of “ large accelerated filer ” , “ accelerated filer ” , “ smaller reporting company ” and “ emerging growth company " in Rule 12b - 2 of the Exchange Act ( Check one ) . Large accelerated filer 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 is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . YES NO 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 USC . 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . YES NO The aggregate market value of the voting and non - voting stock held by non - affiliates of the registrant as of the last business day of the registrant's most recently completed second fiscal quarter was $ 67,031,281 . Registrant had 3,342,210 shares of its $ 2.50 par value Common Stock outstanding as of March 12 , 2021 . DOCUMENTS INCORPORATE BY REFERENCE ( 1 ) Certain portions of the Company's Proxy Statement for the Annual Meeting scheduled for April 20 , 2021 are incorporated into the Company's Annual Report on Form 10 - K for the fiscal year ended December 31 , 2020 , in Part III .