X0306 4 2018-11-15 0001030749 GULFMARK OFFSHORE INC GLF 0001452077 Rubio Samuel R 842 W. SAM HOUSTON PARKWAY N. STE 400 HOUSTON TX 77024 1 Senior VP and CFO Common Stock 2018-11-15 4 D 0 196 D 9483 D Common Stock 2018-11-15 4 D 0 9483 D 0 D Warrants (Right to Buy) 100 2018-11-15 4 D 0 2115 D 2017-11-14 2024-11-14 Common Stock 2115 0 D Each share of common stock was disposed of pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated as of July 15, 2018, between Tidewater Inc. ("Tidewater") and the Issuer, in exchange for (1) 1.100 shares of common stock of Tidewater and (2) any applicable cash in lieu of fractional shares of common stock of Tidewater. As previously reported, the reporting person received a grant of restricted stock units representing a contingent right to receive the equivalent number of shares of common stock of the Issuer for no consideration that vest in one-third increments on each of the first three anniversaries of April 13, 2018. On November 15, 2018, each restricted stock unit was disposed of pursuant to the Merger Agreement in exchange for restricted stock units of Tidewater representing a contingent right to receive 1.100 shares of common stock of Tidewater on substantially similar terms, as described in more detail in the Merger Agreement. The warrants were assumed by Tidewater pursuant to the Merger Agreement and converted automatically into a warrant representing a right to acquire shares of common stock of Tidewater on substantially the same terms, as described in more detail in the Merger Agreement. /s/ Samuel R. Rubio 2018-11-15