X0306 4 2018-02-14 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 2018-02-14 4 M 0 41217 A 982765 D COMMON STOCK 2018-02-14 4 D 0 41217 3.47 D 941548 D COMMON STOCK 2018-02-14 4 F 0 12118 3.91 D 929430 D COMMON STOCK 42511 I By Limited Partnership COMMON STOCK 1650 I By Wife COMMON STOCK 70000 I By Family Trusts COMMON STOCK 70 I By UTMA custodian for child COMMON STOCK 220 I By IRA PHANTOM STOCK 2018-02-14 4 M 0 41217 D COMMON STOCK 41217 82436 D Represents the one-third vesting and cash settlement of a time-vest phantom restricted stock unit award with a Grant Date of February 14, 2017. 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. Disposition of these shares represents payment of tax liability by delivering or withholding securities incident to the vesting of a restricted stock award issued in accordance with Rule 16b-3. Represents shares beneficially owned by Reporting Person through a Family Limited Partnership Represents shares beneficially owned by Reporting Person through various family trusts. /s/ Beth A. LaBrosse as POA for Todd M. Hornbeck 2018-02-16