Executive Change

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): March 17, 2026       Tidewater Inc. (Exact name of registrant as specified in its charter)       Delaware 1-6311 72-0487776 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.)   842 West Sam Houston Parkway North , Suite 400 Houston , Texas   77024 (Address of principal executive offices)   (Zip Code)   Registrant’s telephone number, including area code: ( 713 ) 470-5300   Not Applicable (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 (see General Instruction A.2. below):   ¨ 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, $0.001 par value per share   TDW   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) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2).   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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.   Resignation of Darron M. Anderson   On March 17, 2026, Darron M. Anderson notified the Board of Directors (the “ Board ”) of Tidewater Inc. (the “ Company ”) of his intent to not stand for reelection as a Director of the Board at the Company’s 2026 Annual Meeting of Stockholders (the “ 2026 Annual Meeting ”). Mr. Anderson’s decision not to stand for reelection did not result from any disagreement with the Company on any matter relating to the Company’s operations, policies, or practices. Mr. Anderson will continue his role as Director and member of the Audit Committee and Safety & Sustainability Committee of the Board until the expiration of his current term at the 2026 Annual Meeting.   In connection with Mr. Anderson’s resignation as a director, the size of the Board of Directors will be reduced from eight to seven Directors.   Item 9.01 Financial Statement and Exhibits   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.     TIDEWATER INC.     Date: March 19, 2026 By: /s/ Daniel A. Hudson     Daniel A. Hudson     Executive Vice President, General Counsel and Corporate Secretary