X0306 4 2019-02-15 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 2019-02-15 4 M 0 47339 A 951526 D COMMON STOCK 2019-02-15 4 D 0 47339 1.47 D 904187 D COMMON STOCK 2019-02-15 4 M 0 213972 A 1118159 D COMMON STOCK 2019-02-15 4 D 0 213972 1.47 D 904187 D COMMON STOCK 2019-02-15 4 F 0 14155 1.59 D 890032 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 2019-02-15 4 M 0 47339 D COMMON STOCK 47339 0 D PHANTOM STOCK 2019-02-15 4 M 0 213972 D COMMON STOCK 213972 70062 D PHANTOM STOCK 2019-02-15 4 D 0 70062 D COMMON STOCK 70062 0 D Represents the one-third vesting and cash settlement of a time-vest phantom stock unit award with a Grant Date of February 16, 2016. 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. Represents the vesting and cash settlement of a performance-vest phantom stock unit award with a Grant Date of February 16, 2016. 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 unit award issued in accordance with Rule 16b-3. 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. These shares represent the forfeiture of a portion of a performance-vest phantom stock unit award granted February 16, 2016. /s/ Beth A. LaBrosse as POA for Todd M. Hornbeck 2019-02-20