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Horizon Lines is a maritime transport and logistics company. It is the only Jones Act shipper to serve the 3 non-contiguous regions of Puerto Rico, Alaska and Hawaii. In addition, the company also ships to Guam as well as Asia as part of an agreement with Moller Maersk.
Horizon doesn't have a direct competitor for comparison as it is the only Jones Act shipper to service all three non-contiguous US ports (Puerto Rico, Hawaii/Guam, Alaska). The competitors listed below are also Jones Act shippers but have other operations and/or focus.
Alexander & Baldwin - Hawaii-based operator with operations in sugar & real estate:
Kirby (KEX) - Inland tank barge carrier focused mainly on petrochemical liquids transportation with some operations in diesel engine services.