X0303 4/A 2011-03-31 2011-04-04 0 0001030749 GULFMARK OFFSHORE INC GLF 0001452077 Rubio Samuel R 10111 RICHMOND AVE, STE. 340 HOUSTON TX 77042 0 1 0 0 Controller & CAO Common Stock 2011-03-31 4 A 0 66 26.27 A 20979 D The transaction reported here is made pursuant to the GulfMark Offshore, Inc. Employee Stock Purchase Plan. This Form is being filed to amend the reporting person's Form 4 originally filed on April 4, 2011. The original Form 4 inadvertently reflected that the reporting person purchased 67 shares under the Company's Employee Stock Purchase Plan. The actual share purchase was 66 shares. As of March 31, 2011, the reporting person directly owned 20,979 shares of common stock. /s/ Samuel R. Rubio 2011-04-12