X0306 4 2019-02-06 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 2019-02-06 4 M 0 170252 A 1086764 D COMMON STOCK 2019-02-06 4 D 0 170252 1.39 D 916512 D COMMON STOCK 701 I By Limited Liability Company COMMON STOCK 1650 I By Wife COMMON STOCK 86724 I By Family Trusts COMMON STOCK 70 I By UTMA custodian for child COMMON STOCK 220 I By IRA PHANTOM STOCK 2019-02-06 4 M 0 170252 D COMMON STOCK 170252 340505 D Represents the one-third vesting and cash settlement of a time-vest phantom restricted stock unit award with a Grant Date of February 6, 2018. Each phantom unit is the economic equivalent of one share of the Company's Common Stock. The phantom shares are payable in cash or stock at the election of the Company. Cash awards are based on a 10 day trailing average of the market price of the Company's stock on the vesting date. No shares were actually issued, converted, or sold in connection with this transaction. Includes 500 shares acquired on December 31, 2018 under the Company's employee stock purchase plan. Represents shares beneficially owned by Reporting Person through a closely held Limited Liability Company. Represents shares beneficially owned by Reporting Person through various family trusts. /s/ Beth A. LaBrosse as POA for Todd M. Hornbeck 2019-02-08