Material Agreement · New Debt / Obligation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K   CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 1, 2025   ACME UNITED CORP ORATION (Exact name of registrant as specified in its charter)     Connecticut 001-07698 06-0236700 (State or other jurisdiction of incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.) 1 Waterview Dr , Shelton , Connecticut   06484 (Address of principal executive offices)   (Zip Code) Registrant’s telephone number, including area code: ( 203 ) 254-6060 Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:     ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)   ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)   ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))   ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:   Title of each class   Trading Symbol(s)   Name of each exchange on which registered Common Stock, $2.50 par value per share   ACU   NYSE American   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter). 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. ☐         ITEM 1.01. ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT   Effective as of June 26, 2025, Acme United Corporation (the “Company”) entered into Amendment No. 11 to the Loan and Security Agreement dated as of April 5, 2012, as amended (the ”Loan Agreement”), between the Company and HSBC Bank USA, N.A. Amendment No. 11 extends the scheduled maturity of the $65 million dollar secured revolving credit facility under the Loan Agreement from May 31, 2026 to May 31, 2027. The terms of the Loan Agreement otherwise remain unchanged. The foregoing summary of Amendment No. 11 is qualified in its entirety by reference to the full text of Amendment No. 11, which is filed as Exhibit 10.1 to this Current Report and is incorporated herein by reference.   ITEM 2.03. CREATION OF A DIRECT FINANCIAL OBLIGATION OR AN OBLIGATION UNDER AN OFF-BALANCE SHEET ARRANGEMENT OF A REGISTRANT. The information set forth in Item 1.01 of the Current Report is incorporated herein by reference.     ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS. (c) Exhibits   Exhibit Number Description 10.1   Amendment No. 11 dated July 1, 2025 to the Loan and Security Agreement dated as of April 5, 2012, as amended (together with the Fifth Amended and Restated Secured Revolving Note).           104   Cover Page Interactive Data File (embedded within the Inline XBRL document).   SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.   ACME UNITED CORPORATION   By /s/ Walter C. Johnsen Walter C. Johnsen Chairman and Chief Executive Officer Dated: July 1, 2025 By /s/ Paul G. Driscoll Paul G. Driscoll Vice President and Chief Financial Officer Dated: July 1, 2025