Marine Cargo Handling (U.S., NAICS 48832)

1. Overview

Marine cargo handling is the business of physically loading and unloading ships and moving that cargo across the dock — the stevedores and terminal operators whose longshore workers, cranes, and yard equipment lift containers, cars, grain, coal, steel, and liquids between vessel and shore.[1] It is the labor-and-equipment layer of a seaport, distinct from the government body that owns the land.

This page covers NAICS (North American Industry Classification System) code 48832, the five-digit industry level. It is a rollup of the levels beneath it — but here the rollup is a formality. This industry contains exactly one national industry, 488320 Marine Cargo Handling, and the two are effectively identical: same definition, same firms, same federal statistics. Think of 48832 as the folder and 488320 as the single file inside it.

Because the level equals its one child, this is a short pointer page. The full analysis — investable universe, economics, demand drivers, regulation, consolidation, and risks — lives in the 488320 primer, which you should read for detail.[1] What follows is the level's own ground-truth statistics plus a compact map of where things stand.

2. What's inside — and why the level equals its one child

Under the NAICS hierarchy, a five-digit industry can split into several six-digit national industries. NAICS 48832 does not: the U.S. Census Bureau maps it to a single national industry, 488320 Marine Cargo Handling.[1] When a five-digit code has only one six-digit child, the two are one and the same population of businesses — no data is added or lost moving between them.

So 48832 covers exactly what 488320 covers: establishments primarily engaged in stevedoring and other marine cargo handling — loading and unloading vessels, operating cargo terminals, wharfage (moving cargo across the wharf), longshoring, and ship-hold cleaning.[1] It spans containers, dry bulk (grain, coal, minerals), liquid bulk (petroleum, chemicals), breakbulk (steel, paper, machinery), roll-on/roll-off (RoRo — autos and equipment), and project/military cargo.

It excludes the rest of the seaport, which sits in neighboring codes: 488310 Port and Harbor Operations (the "landlord" and navigation layer), 488330 Navigational Services (pilotage, tugs), and 488390 Other Support Activities.[1] The ocean carriers themselves are separate again (Subsector 483 Water Transportation).[1]

3. Size (this level's rollup figures)

Because 48832 equals its one child, the level's federal statistics are the child's statistics. The figures below are our ground-truth federal data for NAICS 48832. Years and measures differ by source: County Business Patterns (CBP) supplies 2023 employer data; the Economic Census supplies 2022 firm, revenue, and concentration data.

The ~$90,000 payroll-per-employee figure — well above the private-sector norm — reflects a heavily unionized, high-skill longshore workforce. The concentration data describe a nationally fragmented revenue base (an HHI of 592.9 is "unconcentrated" by federal antitrust thresholds), yet the CR50 of 92.1% shows most measured revenue still sits with a relatively small group of larger firms — and national figures hide much tighter concentration at any single port or berth.

Undercount caveat. These figures capture private employer firms only and understate the industry's real footprint. CBP covers establishments with paid employees and excludes most government establishments and nonemployer businesses.[4] Public port-authority staff — who own and sometimes directly operate terminals — are counted under public administration and 488310, not here. And the registered longshore workforce dispatched through union hiring halls (tens of thousands of members on each of the East/Gulf and West coasts) is plausibly larger than the 66,890 paid-employee count, because hours are often booked through carriers or payroll agents rather than the handling firm.[4] Read the ~$10.64 billion as the handling-services fee pool, not the value of the cargo moved (which runs into the trillions).

4. Investable universe (where value concentrates)

With one child industry, there is nowhere for value to "concentrate across children" — it all sits in 488320. And there it concentrates in the private and infrastructure-fund channel, not the public market. There is no U.S.-listed pure-play marine cargo handler.[13]

• Largest U.S. private operators: Ports America (owned by CPP Investments, the Canada Pension Plan) and SSA Marine/Carrix (family, investor, and Blackstone Infrastructure ownership).[10][11]
• Foreign global terminal operators and carrier terminals running U.S. capacity: APM Terminals (Maersk), DP World, PSA International, Terminal Investment Ltd (MSC), Hutchison Ports, and COSCO Shipping Ports.[14][15]
• Public-market proxies (all diluted — U.S. marine handling is a slice, not the whole): Matson (NYSE: MATX), which owns 35% of West Coast operator SSA Terminals; A.P. Møller-Maersk (parent of APM Terminals); energy-terminal names such as Kinder Morgan (NYSE: KMI); and diversified infrastructure vehicles such as Brookfield Infrastructure (NYSE: BIP/BIPC).[13][15][16][23]

See the 488320 primer, Section 4, for the full operator and proxy tables.

5. How the money works

Identical to the child. This is a volume-and-utilization business, priced by the move: stevedoring/handling charges (per container, per ton, or per vehicle), wharfage, and high-margin storage/demurrage/detention fees that spike during congestion.[23] Costs are dominated by unionized labor — among the best-paid blue-collar work in the country — plus equipment, concession/lease payments, and lumpy capital for cranes and yard gear.[23] Fixed labor and rent make the model highly operating-leveraged: modest volume declines pressure earnings, and profits swing with the trade cycle. Full mechanics are in the 488320 primer, Section 5.

6. Demand drivers

The underlying driver is waterborne trade. In 2024, water carried 42.4% of U.S. international freight trade by value ($2.2 trillion) and 79.2% by weight (1.7 billion tons), per the Bureau of Transportation Statistics (BTS).[9] The core cyclical lever is containerized import volume (about 28.1 million TEU — twenty-foot equivalent units — in 2025, essentially flat versus 2024), amplified by consumer spending, retail restocking, and — increasingly — trade-policy timing, as tariff deadlines pull cargo forward and then destock.[21] Structural shifts (nearshoring, East/Gulf coast share gains, ever-larger vessels) round out the picture. See the 488320 primer, Section 6.

7. Regulation

Same regime as the child, since it is the same industry. Marine cargo handling is regulated across trade, safety, security, labor, and environmental regimes: the Federal Maritime Commission (FMC) oversees marine terminal operators under the Shipping Act and the Ocean Shipping Reform Act of 2022 (OSRA); the Occupational Safety and Health Administration (OSHA) applies 29 CFR (Code of Federal Regulations) Parts 1917/1918; the Maritime Transportation Security Act (MTSA) and Transportation Worker Identification Credential (TWIC) govern dock access; the Environmental Protection Agency (EPA) and California Air Resources Board (CARB) drive emissions-related capital spending; and the Committee on Foreign Investment in the United States (CFIUS) reviews foreign terminal ownership.[16][17][18][19] Operations run under master labor contracts (East/Gulf through 2030, West Coast through 2028).[14][15] Full detail in the 488320 primer, Section 7.

8. Consolidation

Two forces define the landscape, both covered in full at the child level: carriers integrating vertically (Maersk/APM, MSC/TIL, COSCO run terminals to control their own ships' turnaround), and financial owners treating terminals as infrastructure (CPP Investments, Blackstone, Brookfield, IFM buying in for stable, toll-like cash flows).[10][11][14][23] Competition is mostly between ports and coasts rather than within a port — each terminal is a local near-monopoly on its berths, so the moderate national HHI of 592.9 can coexist with local monopolies and exclusive concessions.[2] Automation is the flashpoint in labor negotiations. See the 488320 primer, Section 8.

9. Risks

The risk profile is the child's: high operating leverage and trade-volume cyclicality (worsened by tariff whiplash); rare-but-severe labor disruption (the October 2024 East/Gulf strike stranded billions in trade in three days); customer/cargo concentration at individual terminals; port and concession risk; foreign-ownership and geopolitical scrutiny (CFIUS, USTR); capital intensity and stranded-asset risk if trade lanes shift; and environmental, safety, and technology exposures.[13][21] Data risk applies too — federal figures exclude most government and nonemployer activity, so market-size and share estimates require caution.[4] Full list in the 488320 primer, Section 9.

10. How to invest & outlook

How to invest. Because 48832 is 488320, the access map is the same. Public routes are thin and always diluted — the closest listed thread is Matson (NYSE: MATX) via its 35% stake in SSA Terminals, with broader exposure through foreign-listed carriers/operators, energy-terminal names, or a diversified infrastructure vehicle such as Brookfield Infrastructure.[13][23] The actual American assets sit in the private/infrastructure channel: pension and infrastructure funds own the largest operators outright, and institutions access the industry through infrastructure private-equity funds, terminal acquisitions, port concessions, and port-adjacent industrial real estate.[10][11]

Outlook. The base case is steady long-term demand with cyclical earnings. Near-term volume looks flat to softer — the National Retail Federation (NRF) projects first-half 2026 U.S. import container volume down about 2.5% year over year amid tariff uncertainty — offset by labor peace (West Coast to 2028, East/Gulf to 2030) and durable investor appetite for terminals as infrastructure.[22] For most investors, the practical takeaway is unchanged from the child level: this is an infrastructure allocation reached privately and selectively, terminal by terminal — the public market does not offer a clean U.S. marine-cargo-handling security.

For full detail on every section above, read the 488320 primer — this five-digit level adds nothing beyond it.

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Sources

Drawn from the child primer (NAICS 488320); numbering preserved for cross-reference.

1. U.S. Census Bureau, 2022 NAICS Definition — 488320 Marine Cargo Handling (and adjacent 488310/488330/488390 definitions), 2022. https://www.census.gov/naics/?details=488320&input=488320&year=2022
2. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms, NAICS 488320 (receipts, firms, CR4/CR8/CR20/CR50, HHI), 2025. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
3. U.S. Census Bureau, County Business Patterns: 2023 — NAICS 488320 (establishments, employment, annual and Q1 payroll), 2025. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
4. U.S. Census Bureau, County Business Patterns Methodology, 2026. https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
5. U.S. DOT, Bureau of Transportation Statistics, Port Performance Freight Statistics: 2026 Annual Report (2024 waterborne trade share), 2026. https://doi.org/10.21949/1403522
6. CPP Investments, CPP Investments to Acquire Ports America Interest from Oaktree, 2021. https://www.cppinvestments.com/newsroom/cpp-investments-to-acquire-ports-america-interest-from-oaktree/
7. Blackstone, Blackstone Infrastructure Partners Announces Growth-Oriented Investment in Carrix, 2023. https://www.blackstone.com/news/press/blackstone-infrastructure-partners-announces-growth-oriented-investment-in-carrix-one-of-the-world-s-largest-marine-terminal-operators/
8. Matson, Inc., Form 10-K (FY2024) — 35% interest in SSA Terminals (SSAT), 2025. https://www.sec.gov/Archives/edgar/data/3453/000155837025001875/matx-20241231x10k.htm
9. SeaVantage, The Top 10 Container Terminal Operators in International Trade — 2024, 2024. https://www.seavantage.com/blog/the-top-10-container-terminal-operators-in-international-trade---2024
10. APM Terminals, Service Locator (U.S. facilities), 2026. https://www.apmterminals.com/en/tools/service-locator
11. Kinder Morgan, Inc., Form 10-K (FY2024) — terminals segment, 2025. https://www.sec.gov/Archives/edgar/data/1506307/000150630725000008/kmi-20241231.htm
12. APM Terminals, Tariffs (handling, storage, free-time, reefer rate examples), 2026. https://akamai.apmterminals.com/en/tariffs
13. Wikipedia, 2024 United States port strike (ILA/USMX), 2025. https://en.wikipedia.org/wiki/2024_United_States_port_strike
14. International Longshoremen's Association, ILA–USMX Master Contract Agreement (through Sept 30, 2030), 2025. https://ilaunion.org/international-longshoremens-association-and-united-states-maritime-alliance-officially-sign-historic-six-year-master-contract-agreement-at-ceremonies-in-new-jersey-ila-longshore-workers-on-a/
15. Pacific Maritime Association, Pacific Coast Longshore Contract Document 2022–2028, 2025. https://www.pmanet.org/wp-content/uploads/2025/01/Pacific_Coast_Longshore_Contract_Document_2022-2028.pdf
16. Federal Maritime Commission, Marine Terminal Operators and Ocean Shipping Reform Act of 2022 Implementation, 2024–2026. https://www.fmc.gov/marine-terminal-operators/
17. Occupational Safety and Health Administration, 29 CFR Part 1917 (Marine Terminals) and Part 1918 (Longshoring), 2026. https://www.osha.gov/laws-regs/regulations/standardnumber/1918/1918TableofContents
18. U.S. Coast Guard, Facilities (MTSA facility security; TWIC), 2026. https://www.dco.uscg.mil/Our-Organization/Assistant-Commandant-for-Prevention-Policy-CG-5P/Inspections-Compliance-CG-5PC-/Port-and-Facility-Compliance-CG-FAC/Cargo-and-Facilities-Division/Facilities/
19. U.S. Environmental Protection Agency, Ports Primer: Federal Environmental Regulations and Programs, 2026. https://www.epa.gov/ports-initiative/ports-primer-73-federal-environmental-regulations-and-programs
20. White & Case LLP, USTR Issues Final Section 301 Actions in China Shipbuilding Investigation, 2025; and Holland & Knight, USTR Port Fee Suspension: What You Need to Know, 2025. https://www.whitecase.com/insight-alert/ustr-issues-final-section-301-actions-china-shipbuilding-investigation
21. Global Trade Magazine, Tariff Uncertainty Expected to Drag U.S. Container Imports Below 2025 Levels (~28.1M TEU in 2025), 2026. https://www.globaltrademag.com/tariff-uncertainty-expected-to-drag-u-s-container-imports-below-2025-levels/
22. National Retail Federation, Import Cargo Volume Expected to See Year-Over-Year Drop During First Half of 2026, 2026. https://nrf.com/media-center/press-releases/import-cargo-volume-expected-to-see-year-over-year-drop-during-first-half-of-2026
23. Brookfield Infrastructure Partners, Infrastructure — Transport (ports), 2024. https://bip.brookfield.com/