| HSHorizon Shipbuilding, INC. | Bayou La Batre | AL | — | ◇ UNVERIFIED |
| HCHornblower Cruises and Events | San Pedro | CA | — | ◇ UNVERIFIED |
| HCHornblower Cruises & Events | Alameda | CA | — | ◇ UNVERIFIED |
| HSHornblower Shipyard LLC | Bridgeport | CT | — | ◇ UNVERIFIED |
| HSHouston Ship Repair INC | Orange | TX | — | ◇ UNVERIFIED |
| HBHrp Brownsville LLC | Brownsville | TX | — | ◇ UNVERIFIED |
| HBHrp Brownsville LLC | Brownsville | TX | — | ◇ UNVERIFIED |
| HSHull Scrubber Corporation | Port Angeles | WA | — | ◇ UNVERIFIED |
 Huntington Ingalls Industries | Newport News | VA | — | ◇ UNVERIFIED |
| Huntington- Ingalls Industries/ Amsec | Bremerton | WA | — | ◇ UNVERIFIED |
| Huntington Ingalls Industries - Newport News Shipbuilding | Coronado | CA | — | ◇ UNVERIFIED |
| HIHutco, INC. | Calvert City | KY | — | ◇ UNVERIFIED |
| HTHy Tec Marine Prop, LLC | Silt | CO | — | ◇ UNVERIFIED |
 Hyval Industries Incorporated | Portsmouth | VA | — | ◇ UNVERIFIED |
| HVHy Val Industries, Incorporation | Norfolk | VA | — | ◇ UNVERIFIED |
 Illinois Marine Towing INC | Channahon | IL | — | ◇ UNVERIFIED |
| Illinois Marine Towing INC | Lemont | IL | — | ◇ UNVERIFIED |
| Illinois Marine Towing, INC. (imt) | Lemont | IL | — | ◇ UNVERIFIED |
| III.m.w., INC. | Houston | TX | — | ◇ UNVERIFIED |
| IMInd-mar Machine | Jacksonville | FL | — | ◇ UNVERIFIED |
| IMIndustrial Marine INC | Portland | OR | — | ◇ UNVERIFIED |
| IMIndustrial Marine INC. | Portland | OR | — | ◇ UNVERIFIED |
| ITIndustrial Turnaround & Construction, L.l.c. | Ingleside | TX | — | ◇ UNVERIFIED |
| ISIngalls Shipbuilding | Pascagoula | MS | — | ◇ UNVERIFIED |
| ISIngalls Shipbuilding, Gulfport Operations | Gulfport | MS | — | ◇ UNVERIFIED |
| IIInland Industries | Orange | TX | — | ◇ UNVERIFIED |
| IMIntegrated Marine Services | Terminal Island | CA | — | ◇ UNVERIFIED |
| IMIntegrated Marine Services INC. | San Pedro | CA | — | ◇ UNVERIFIED |
| IIntegrity | Port Arthur | TX | — | ◇ UNVERIFIED |
 International Flooring & Protective Coatings, INC. | Norfolk | VA | — | ◇ UNVERIFIED |
| IMInternational Marine and Industrial Applicators | San Diego | CA | — | ◇ UNVERIFIED |
| IMInternational Marine and Industrial Applicators LLC | Saint Marys | GA | — | ◇ UNVERIFIED |
| IMInternational Marine and Industrial Applicators LLC | Portsmouth | VA | — | ◇ UNVERIFIED |
| IMInternational Marine and Industrial Applicators, LLC | Philadelphia | PA | — | ◇ UNVERIFIED |
| IMInternational Marine and Industrial Applicators, LLC | Portsmouth | VA | — | ◇ UNVERIFIED |
| IMInternational Marine and Industrial Applicators, LLC | Portsmouth | VA | — | ◇ UNVERIFIED |
| IMInternational Marine & Industrial Applicator LLC | Norfolk | VA | — | ◇ UNVERIFIED |
| IMInternational Marine & Industrial Applicators INC | San Diego | CA | — | ◇ UNVERIFIED |
| IMInternational Marine & Industrial Applicators LLC | Jacksonville | FL | — | ◇ UNVERIFIED |
| IMInternational Marine & Industrial Applicators LLC | Bremerton | WA | — | ◇ UNVERIFIED |
| IMInternational Marine & Industrial Applicators, LLC | Honolulu | HI | — | ◇ UNVERIFIED |
| IMInternational Marine & Industrial Applicators, LLC | Honolulu | HI | — | ◇ UNVERIFIED |
| IPInternational Paint LLC | San Diego | CA | — | ◇ UNVERIFIED |
| ISInternational Shipbreakers INC. Uss Wichita | Brownsville | TX | — | ◇ UNVERIFIED |
| ISInternational Shipbreaking | Brownsville | TX | — | ◇ UNVERIFIED |
| IMInt'l Marine & Ind Applicators LLC | San Diego | CA | — | ◇ UNVERIFIED |
| IMIntl Marine & Ind Applicators, LLC | Bremerton | WA | — | ◇ UNVERIFIED |
| ICIntracoastal City Dry Dock | Abbeville | LA | — | ◇ UNVERIFIED |
| IMIreland Marine Transportation, INC. | Chesapeake | VA | — | ◇ UNVERIFIED |
| ISIsland Shipyard, INC. | Green Cove Springs | FL | — | ◇ UNVERIFIED |
