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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A 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 9, 2025 OCEANEERING INTERNATIONAL, INC. (Exact name of registrant as specified in its charter) Delaware 1-10945 95-2628227 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 5875 North Sam Houston Parkway West, Suite 400 Houston, TX 77086 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: ( 713 ) 329-4500 N/A (Former name or former address, if changed since last report) 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 exchange on which registered Common stock, par value $0.25 per share OII New York Stock Exchange 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. ☐ EXPLANATORY NOTE Oceaneering International, Inc. (“Oceaneering”) is filing this Amendment on Form 8-K/A to amend its Current Report on Form 8-K, as originally filed with the U.S. Securities and Exchange Commission on May 9, 2025 (the “Original Filing”), solely for the purpose of adding a conformed signature to the signature page, which was inadvertently omitted from the Original Filing. 1 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. OCEANEERING INTERNATIONAL, INC. Date: May 12, 2025 By: /S/ JENNIFER F. SIMONS Jennifer F. Simons Senior Vice President, Chief Legal Officer and Secretary 2