X0306 4 2017-02-17 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 2017-02-17 4 D 0 11654 D 1069264 D COMMON STOCK 2017-02-17 4 F 0 11533 4.66 D 1057731 D COMMON STOCK 2017-02-17 4 F 0 5103 4.66 D 1052628 D COMON STOCK 2017-02-17 4 M 0 5833 A 1058461 D COMMON STOCK 2017-02-17 4 D 0 5833 6.85 D 1052628 D COMMON STOCK 42511 I By Limited Partnership COMMON STOCK 1650 I By Wife COMMON STOCK 20000 I By Family Trusts COMMON STOCK 70 I By UTMA custodian for child COMMON STOCK 220 I By IRA PHANTOM STOCK 2017-02-17 4 M 0 5833 D COMMON STOCK 5833 0 D These shares represent the forfeiture of a portion of a performance - vest restricted stock unit award granted February 18, 2014. Disposition of these shares represents payment of tax liability by delivering or withholding securities incident to the vesting of a restricted stock unit award issued in accordance with Rule 16b-3. Represents the vesting and cash settlement of a time-vest phantom restricted stock unit award with a Grant Date of February 18, 2014. Each phantom unit is the economic equivalent of one share of the Company's Common Stock. The phantom shares are payable only in cash 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. 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 2017-02-22