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) September 30, 2015

TIDEWATER INC.

(Exact name of registrant as specified in its charter)

(504) 568-1010

(Registrant’s telephone number, including area code)

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 registrants under any of the following provisions:

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Item 8.01. Other Events

In accordance with the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, the Company notes that certain statements set forth in this Current Report on Form 8-K provide other than historical information and are forward looking. The actual achievement of any forecasted results, or the unfolding of future economic or business developments in a way anticipated or projected by the Company, involve numerous risks and uncertainties that may cause the Company’s actual performance to be materially different from that stated or implied in the forward-looking statement. Among those risks and uncertainties, many of which are beyond the control of the Company, include, without limitation, volatility in worldwide energy demand and oil and gas prices; and the potential long-term effects of a depressed level of oil and gas prices; consolidation of our customer base: fleet additions by competitors and industry overcapacity; our views with respect to the need for and timing of the replenishment of our asset base, including through acquisitions or vessel construction; changes in capital spending by customers in the energy industry for offshore exploration, field development and production; loss of a major customer: changing customer demands for vessel specifications, which may make some of our older vessels technologically obsolete for certain customer projects or in certain markets; delays and other problems associated with vessel construction and maintenance; uncertainty of global financial market conditions and difficulty in accessing credit or capital; acts of terrorism and piracy; integration of acquired businesses and entry into new lines of business; disagreements with our joint venture partners; significant weather conditions; unsettled political conditions, war, civil unrest and governmental actions, such as expropriation or enforcement of customs or other laws that are not well developed or consistently enforced, or requirements that services provided locally be paid in local currency, in each case especially in higher political risk countries where we operate; foreign currency fluctuations; labor changes proposed by international conventions; increased regulatory burdens and oversight; changes in laws governing the taxation of foreign source income; retention of skilled workers; and enforcement of laws related to the environment, labor and foreign corrupt practices. Readers should consider all of these risk factors as well as other information contained in this report.

On September 30, 2015, Joseph M. Bennett, Executive Vice President and Chief Investor Relations Officer, presented at the Johnson Rice 2015 Energy Conference in New Orleans, Louisiana.

The following information is being provided under Item 8.01 Other Events in this Current Report on Form 8-K: (1) a slide presentation presented at the Johnson Rice 2015 Energy Conference on September 30, 2015 in New Orleans, Louisiana included as Exhibit 99.1 and (2) a transcript of the presentation at the Johnson Rice 2015 Energy Conference on September 30, 2015 in New Orleans, Louisiana included as Exhibit 99.2. Both Exhibit 99.1 and 99.2 are incorporated herein by reference as if fully set forth.

The information contained in the transcript, which was prepared by Wall Street Webcasting, is a textual representation of the Company’s presentation. There may be material errors, omissions or inaccuracies in the reporting of the contents of the presentation. The Company assumes no responsibility to correct or update the third-party transcript. Users are advised to review the Company’s SEC filings before making any investment or other decisions.

Item 9.01. Financial Statements and Exhibits.

The following exhibits are furnished with this Form 8-K:

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SIGNATURE

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.

Date: October 5, 2015

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