Results of Operations

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) May 4, 2021   Commission file number: 000-03134 Park-Ohio Holdings Corp. (Exact name of registrant as specified in its charter)   Ohio   34-1867219 (State or other jurisdiction of incorporation or organization)   (I.R.S. Employer Identification No.) 6065 Parkland Boulevard, Cleveland, Ohio   44124 (Address of principal executive offices)   (Zip Code) Registrant’s telephone number, including area code ( 440 ) 947-2000 Not applicable (Former name or former address, if changed since last report.) 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, Par Value $1.00 Per Share PKOH The NASDAQ Stock Market LLC 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 (see General Instruction A.2.): ☐ 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)) Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934. ☐ 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. ¨ 2 Item 2.02 Results of Operations and Financial Condition. On May 4, 2021, Park-Ohio Holdings Corp. issued a press release announcing its quarter ended March 31, 2021 results. The press release is attached hereto as Exhibit 99.1. The information contained in this Current Report shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit Number    Description 99.1    Park-Ohio Holdings Corp. Press Release, dated May 4, 2021 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) 3 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.       Park-Ohio Holdings Corp. (Registrant) Dated: May 4, 2021   /s/ Patrick W. Fogarty   Patrick W. Fogarty   Vice President and Chief Financial Officer 4