Marine Support Services NAICS 4883

        Marine Support Services

Unlock access to the full platform with more than 900 industry reports and local economic insights.

Get Free Trial

Get access to this Industry Profile including 18+ chapters and more than 50 pages of industry research.

Purchase Report

Industry Summary

The 2,040 marine support services firms in the US include companies that operate ports, harbors, and canals, as well as companies that provide marine cargo handling and storage services. The industry also includes companies providing navigational services, such as piloting or tugboat services, and marine salvaging services.

Dependence on International Trade

Revenue for marine support services is driven by US imports and exports, which in turn depend on global economic conditions and international trade agreements.

Automation of Operations

As cargo volumes increase and ships get larger, marine terminal operators face challenges in quickly loading and unloading cargo to avoid congestion and delays for shippers, truckers and railcar operators.


Recent Developments

Nov 12, 2025 - Tariffs on Cargo Equipment Slowing US Port Modernization
  • US ports are urging the federal government to roll back steep tariffs on imported cargo-handling equipment, warning that the measures are delaying critical upgrades and threatening long-term growth. The American Association of Port Authorities (AAPA) said the tariffs (currently 100% on certain types of equipment, with proposals to raise them to 150%) are increasing project costs and slowing modernization efforts. Items such as ship-to-shore cranes, reach-stackers, and terminal tractors are essential to ports, yet much of this equipment is not manufactured domestically. As a result, ports have little choice but to import from foreign suppliers, primarily in Asia. Industry leaders argue that these tariffs undermine US competitiveness by stalling infrastructure projects at a time when global trade and cargo volumes are expanding. While the AAPA supports domestic manufacturing growth, it says that punitive tariffs without parallel incentives, such as tax credits or infrastructure investment, will ultimately weaken America’s supply chain.
  • Tumbling ocean shipping rates from China to the US indicate the peak shipping season of 2025 was shorter than usual and retailers and manufacturers are wary of placing new orders because of tariffs. The rate slide in July of 68% from the previous month comes just before the fall and winter shopping season, one of the busiest shipping times of the year. The tariff situation is making it difficult for shipping companies to properly plan ahead, with importers either reducing current inventory or leaning heavily on the stockpiled goods they bought when the tariffs were announced in April. The average shipping rate from China to the West Coast in early September was $1,802, down from the year’s high of $5,553 in June. The forecast for the rest of the year from the National Retail Federation predicts monthly year-over-year declines of anywhere from 19% to 21%.
  • Imports to the Port of Los Angeles, the busiest US port, rebounded in June as retailers stocked up on holiday inventory in an effort to get ahead of potentially steeper tariffs later in the year. Incoming cargo to the port jumped 10% from the previous year after the US came to terms with China. It was also a 32% increase from May when imports cratered after a brief 145% import tax on Chinese goods. Shipping experts say the situation is likely as good as it will get this year since holiday orders have already been placed and manufactured and can’t be altered this late in the year. The National Retail Federation expects double-digit import declines from August through November due to additional potential tariff increases and order timing. The Trump administration plans to tariff Mexico and the EU by 30% starting August 1, sending the industry back into a scramble.
  • An analysis of US ports by World Bank Group and S&P Global found only eight US ports rank in the top 100 of the world’s most efficient water entryways. The port of Charleston, South Carolina was the country’s most efficient, but still ranked at a somewhat lowly 52nd place. US port inefficiency is caused by a lack of automation in data systems and cargo equipment, resulting in longer wait times to process imports and exports. On an efficiency scale of 1 to 10, US ports scored an average of 3.7, while other nations averaged 7.9. Automation is critical to modern port operations, but such upgrades may not occur soon. The US averted a strike by the International Longshoremen’s Association in 2024 that would have crippled East Coast and Gulf ports by raising pay almost 60%, but the issue of automation was kicked down the road into 2025.

Industry Revenue

Marine Support Services


Industry Structure

Industry size & Structure

The average marine support services company operates out of a single location, employs 50 workers, and generates $16.1 million annually.

    • The marine support services industry consists of about 2,040 firms employing about 103,440 workers and generating around $32.9 billion annually.
    • About 360 commercial ports in the US and its territories handle 2-3 billion gross tons of cargo annually.
    • The top US ports, based on volume of twenty-foot equivalent units (TEUs) handled include Houston, New York/New Jersey, Long Beach, Port of Virginia, Charleston, Seattle, and Los Angeles.
    • The industry is concentrated, with the 50 largest firms accounting for 67% of industry revenue.
    • Large companies include Ports America, APM Terminals (headquartered in the Netherlands), and SSA Marine.

                              Industry Forecast

                              Industry Forecast
                              Marine Support Services Industry Growth
                              Source: Vertical IQ and Inforum

                              Vertical IQ Industry Report

                              For anyone actively digging deeper into a specific industry.

                              50+ pages of timely industry insights

                              18+ chapters

                              PDF delivered to your inbox

                              Privacy Preference Center