X0306 4 2018-02-06 0 0001131227 HORNBECK OFFSHORE SERVICES INC /LA HOS 0001284591 HORNBECK TODD M 103 NORTHPARK BOULEVARD, SUITE 300 COVINGTON LA 70433 1 1 0 0 President & CEO COMMON STOCK 2018-02-06 4 D 0 206 0.00 D 987946 D COMMON STOCK 2017-06-20 4 G 0 50000 0.00 A 70000 I By Family Trusts COMMON STOCK 42511 I By Limited Partnership COMMON STOCK 1650 I By Wife COMMON STOCK 70 I By UTMA custodian for child COMMON STOCK 220 I By IRA PHANTOM STOCK 2018-02-06 4 A 0 510757 0.00 A 2019-02-06 2021-02-06 COMMON STOCK 510757 510757 D PHANTOM STOCK 2018-02-06 4 A 0 510756 0.00 A 2021-02-06 2021-02-06 COMMON STOCK 510756 510756 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. Represents shares beneficially owned by Reporting Person through various family trusts. Represents shares beneficially owned by Reporting Person through a Family Limited Partnership 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 Todd M. Hornbeck 2018-02-08