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 10, 2018 AMPCO-PITTSBURGH CORPORATION (Exact name of registrant as specified in its charter) Pennsylvania 1-898 25-1117717 (State or other jurisdiction of incorporation) (Commission file number) (I.R.S. Employer Identification Number) 726 Bell Avenue, Suite 301, Carnegie PA 15106 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: (412) 456-4400 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)) 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 2.02. Disclosure of Results of Operations and Financial Condition On May 10, 2018, Ampco-Pittsburgh Corporation issued a press release announcing its results for the three months ended March 31, 2018. A copy of the press release is attached hereto. The information in this Item 2.02 shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be incorporated by reference into a filing under the Securities Act of 1933, 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 99.1 – Press release dated May 10, 2018 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. AMPCO-PITTSBURGH CORPORATION Date: May 10, 2018 By: /s/ Michael G. McAuley Michael G. McAuley Senior Vice President, Chief Financial Officer and Treasurer