X0306 4 2018-02-06 0 0001131227 HORNBECK OFFSHORE SERVICES INC /LA HOS 0001353569 Cook John S 103 NORTHPARK BOULEVARD, SUITE 300 COVINGTON LA 70433 0 1 0 0 Executive VP, CCO, & CIO COMMON STOCK 2018-02-06 4 D 0 67 0.00 D 219592 D COMMON STOCK 50 I By UGMA custodian for children PHANTOM STOCK 2018-02-06 4 A 0 169251 0.00 A 2019-02-06 2021-02-06 COMMON STOCK 169251 169251 D PHANTOM STOCK 2018-02-06 4 A 0 169251 0.00 A 2021-02-06 2021-02-06 COMMON STOCK 169251 169251 D These shares represent the forfeiture of a portion of a performance - vest restricted stock unit award granted February 5, 2013. Includes 500 shares acquired under the Company's employee stock purchase plan on June 30, 2017 and 500 shares acquired under the Company's employee stock purchase plan on December 31, 2017. These time-vest phantom restricted stock unit awards will vest in three equal annual installments on the 1st, 2nd and 3rd anniversaries of the Grant Date. Each is the economic equivalent of one share of the Company's Common Stock. These phantom shares are payable in either stock, cash or notes payable at the election of the Company. These performance-vest phantom restricted stock awards can vest in whole or in part on the 3rd anniversary of the Grant Date based upon the Company achieving certain levels of specified performance objectives. The number of units listed above represent the maximum amount that may be earned, or 150% of the target grant. Each is the economic equivalent of one share of the Company's Common Stock. These phantom shares are payable in either stock, cash, or notes payable at the election of the Company. /s/ Beth A. LaBrosse as POA for John S. Cook 2018-02-08