Port and Harbor Operations (U.S.) — Industry Primer

NAICS 2022 code 488310 — Port and Harbor Operations

(NAICS = North American Industry Classification System, the standard U.S. government code for industries.)

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1. Overview

Port and Harbor Operations covers the businesses that run the physical gateway where ships meet land: operating and maintaining the piers, docks, berths, harbors, and canals that vessels tie up to, and managing the terminal real estate around them.[1] It is the "landlord and traffic-cop" layer of the maritime supply chain — distinct from the crews that lift boxes off ships, the tugs that maneuver vessels, and the carriers that own the ships.

This is best understood as infrastructure, not a conventional transportation business. The asset is scarce, deep-water waterfront land wired into roads, railways, pipelines, and warehouses — long-lived, hard to replicate, and capable of throwing off contracted, often inflation-linked cash flows. That profile is prized by pension funds, sovereign wealth funds, and infrastructure investors. Revenue can be earned by a public port authority, a private terminal operator, or both, split across a lease or concession.

The scale of the broader system is large even though this exact industry code is small. The U.S. Government Accountability Office (GAO) counts more than 300 U.S. waterside ports, which handled over $2.28 trillion of U.S. international trade in 2022.[6] An industry study for the American Association of Port Authorities (AAPA) estimates that total U.S. port-related activity supports roughly $2.9 trillion in economic value and 21.8 million jobs.[7] But — as Section 3 explains — most of that footprint sits in adjacent codes and in government-owned ports that federal business statistics largely exclude.

The catch for public-market investors: in the United States there is almost no pure-play public company in this exact business. Most large U.S. ports are owned by government port authorities (public agencies), and the biggest private operators are held by pension funds, sovereign wealth funds, and private-equity infrastructure funds — not traded on a U.S. exchange.

• Public-market ways in: foreign-listed global terminal operators (Copenhagen, Hong Kong, Manila, Mumbai, London), one U.S.-listed ocean-carrier proxy, and U.S.-listed energy/midstream firms that own marine terminals. There is no clean U.S. pure-play ticker.
• Private ways in: infrastructure funds, pension co-investments, public-private partnerships (PPPs), municipal port revenue bonds, private credit, and direct terminal-lease/concession deals.

Bottom line: the investable opportunity is usually a specific gateway, terminal, or concession — not "the national industry."

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2. What it is and how it's structured

In scope (NAICS 488310): establishments primarily engaged in operating ports, harbors (including docking and pier facilities), or canals — the operation and maintenance of piers, docks, wharves, berths, and associated buildings and equipment, plus overall port/harbor management, and the collection of dockage, wharfage, terminal, and storage fees.[1] It supports container, bulk, agricultural, energy, automobile, project-cargo, cruise, and passenger traffic.

Explicitly excluded — and this matters for sizing the industry:

• 488320 Marine Cargo Handling — stevedoring: the crews and cranes that actually load and unload vessels. Most of the "port" labor and revenue lives here, not in 488310.[1]
• 488330 Navigational Services to Shipping — tugboats, towing, and harbor pilots (pilotage) that maneuver ships.[1]
• 713930 Marinas — recreational-boat docking and storage.[1]
• 483 Water Transportation — owning and operating the ships themselves.
• 493 Warehousing and Storage — the sheds and distribution centers behind the wharf.
• 484 Truck Transportation and 482 Rail Transportation — the landside drayage and rail that move cargo inland.

The Census Bureau cross-references 488320, 488330, and 713930 as outside 488310.[1] Real-world "port" companies are often hybrids that earn revenue across several of these codes at once, which is why no single code captures a large operator's full business.

Ownership mix — the defining feature. Most major U.S. ports run on the "landlord port" model: a state, county, or municipal port authority (e.g., the Port Authority of New York and New Jersey, Georgia Ports Authority, Port of Los Angeles) owns the land and berths and leases them to private marine terminal operators under long-term concessions, typically 10–30 years, often with minimum annual guarantees (MAGs — a rent floor regardless of volume).[6][8] A minority are "operating ports" where the authority runs the terminals itself (e.g., Virginia; Houston is a hybrid).[6] Even in a lease, the authority usually keeps significant control over land use, security, rate-setting, capital plans, and concession terms. The federal business statistics below therefore capture mainly the private and quasi-private operators and management companies — not the government authorities.

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3. How big it is (federal figures + the undercount)

Official U.S. Census and U.S. Small Business Administration (SBA) figures for NAICS 488310. Our ingested federal statistics are the ground truth here:

(CR4 is the revenue share of the four largest firms; HHI is a market-concentration index built from firms' revenue shares. The SBA's $47 million figure is a government-contracting eligibility threshold, not a measure of industry size.)

Read the undercount carefully. These numbers describe a small industry on paper — 326 establishments, under 14,000 workers, ~$4.45 billion in receipts. That is because federal business statistics undercount ports on purpose: County Business Patterns (CBP) covers employer establishments with paid employees and excludes public administration and most government employees, and the Economic Census generally excludes government-owned establishments — and the biggest U.S. ports are government port authorities.[4] Nonemployer businesses and activity booked under adjacent codes (cargo handling, tugs, warehousing, trucking, rail) are also missing. Treat the 488310 figures as the management-and-facility-operations sliver of a vastly larger system, not the size of "the port economy." Our source data provides no single broader market-size total for this code; the $2.28 trillion (trade value)[6] and $2.9 trillion / 21.8 million jobs (total economic impact)[7] figures in Section 1 describe the whole port ecosystem, not NAICS 488310 alone.

Concentration. An HHI of ~601 is technically "unconcentrated," and CR4 of 41% is moderate.[3] But national figures understate real-world market power, because competition is intensely local — a shipper in Savannah cannot substitute the Port of Seattle. Within any single harbor, one or two terminal operators often dominate, and limited land, channel depth, or rail access can leave customers with few practical alternatives.

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4. The investable universe

There is no U.S.-listed pure-play port operator whose financials represent only NAICS 488310. The largest U.S. terminal operators are private, and the largest U.S. ports are public agencies that fund themselves with municipal revenue bonds, not equity. Listed exposure is mostly indirect.

Publicly traded operators with meaningful port/terminal exposure:

(TEU = twenty-foot equivalent unit, the standard container-count measure. SEZ, MLP defined above.)

Note: DP World (Dubai) and PSA International (Singapore) are top-tier global operators but are not publicly traded — owned by the Dubai government and Singapore's Temasek, respectively.[16]

Major private / non-equity owners of U.S. port operations:

• Ports America — the largest U.S. container terminal operator (~19 million TEU handled in 2024) and stevedore, active through PPPs with port authorities; wholly owned since 2021 by CPP Investments (Canada Pension Plan), bought out from Oaktree Capital.[11][12]
• SSA Marine / Carrix — one of the largest independent, privately held operators across container, bulk, automobile, cruise, and project-cargo facilities; its West Coast SSA Terminals venture includes Matson (35%).[13][14]
• CMA CGM (CMA Terminals) — family-owned French shipping group with U.S. terminal assets including Port Liberty (NY/NJ) and Fenix Marine Services (Los Angeles).[34]
• Maher Terminals — privately held multi-user container terminal in the Port of New York and New Jersey.[36]
• The Pasha Group — privately held operator focused on automobile, breakbulk, project, and container cargo.[37]
• Crowley — privately held, U.S.-owned maritime and logistics company with port terminals and related facilities.[38]
• Gulftainer / GT USA — privately owned international operator holding U.S. terminal concessions.[39]
• Public port authorities (NY/NJ, Los Angeles, Long Beach, Georgia, South Carolina, Virginia, Houston) — government agencies; investable only via their tax-exempt revenue bonds, backed by lease rents, wharfage, and dockage.[6]

Public-market bottom line: if you want listed equity, you are buying a foreign terminal operator, a diversified shipping company, or a U.S. energy-midstream firm that happens to own marine terminals — not a U.S. port. The purest exposure to U.S. port cash flows is private (infrastructure funds) or fixed-income (port revenue bonds).

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5. How the money works

Owners in this industry monetize scarce waterfront land and guaranteed traffic, not the cargo itself. Core revenue lines:

• Lease / concession rent. The landlord authority's biggest and most stable line: long-term rent from terminal operators, usually with a minimum annual guarantee (MAG) so the port gets paid even in a slow year, plus escalators.[8][40] This "annuity" is what makes ports bond-financeable and attractive to pension investors.
• Wharfage — a per-ton charge on cargo crossing the wharf, whether or not the vessel uses port cranes.[40]
• Dockage — a charge for a vessel occupying a berth, billed per foot of vessel length or per gross ton, per day.[40]
• Container / throughput royalties, plus ancillary charges: storage and late-pickup (demurrage), equipment, crane, gate, rail, utility, and security fees.[40]
• Passenger, cruise, and vehicle-processing fees, and bulk-liquid storage and transfer charges for energy terminals.
• For operating ports and terminal operators, revenue also includes cargo-handling fees per container/lift — though pure stevedoring sits in NAICS 488320.

Unit economics. Ports are high-fixed-cost, capital-intensive businesses — dredged channels, cranes, wharves, paved yards, gates, and IT systems cost hundreds of millions and last decades, and most of that spend lands before the incremental volume arrives. Key operating metrics:

• Throughput — TEUs (containers), tons (bulk/breakbulk), vehicle units (ro-ro, i.e., roll-on/roll-off), passengers, or vessel calls — drives variable revenue and utilization.
• Berth, crane, and yard utilization / capacity — like occupancy for real estate; the asset earns only when it's full.
• Revenue per unit (per TEU, ton, vehicle, or ship call), crane productivity, truck turn time, and cargo dwell time.
• Contracted rent coverage (MAGs) — the share of revenue locked in regardless of volume, which cushions cyclicality.
• Operating leverage — because costs are largely fixed, incremental volume drops heavily to the bottom line, and volume losses hurt disproportionately.

Main costs are labor, equipment maintenance, electricity and fuel, land leases, insurance, security, dredging, environmental compliance, IT, and capital expenditure. For government authorities, "profit" is really debt-service coverage: revenues over the interest and principal on the revenue bonds that funded the terminals and dredging. For private operators and their pension/infrastructure owners, the target is a stable, inflation-protected yield on a hard-to-replicate asset — closer to a toll road than a growth stock. The best assets combine high utilization, long concessions, pricing flexibility, and strong rail/highway connections with room to grow without disproportionate capital spending.

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6. What drives demand

• U.S. imports and consumption. Port throughput tracks imports (consumer goods, autos, industrial inputs) and exports (agriculture, energy, chemicals). When consumer spending and inventories rise, boxes move.[9]
• Global supply-chain routing. Trade shifts among coasts — West Coast (Los Angeles ~10M TEU and Long Beach ~9.6M TEU in 2024, ~20M combined) versus East and Gulf gateways (New York/New Jersey moved ~8.7M TEU worth ~$264 billion in 2024).[9][10] Canal reliability (Panama drought, Suez/Red Sea security) reroutes cargo and reshuffles which ports win.
• Vessel upsizing. Ever-larger ships force ports to deepen channels and raise bridges to stay in the rotation — a structural capital driver. Bigger ships lower unit costs but raise dredging, crane, berth, and yard requirements. The U.S. Army Corps of Engineers (USACE) navigation program maintains channels and harbors supporting roughly 2.3 billion tons of cargo movement a year.[20]
• Nearshoring and trade policy. Tariffs, "China+1" sourcing, reshoring, and USMCA (U.S.–Mexico–Canada Agreement) flows shift volumes among ports and modes.
• Energy and bulk cycles. Liquefied natural gas (LNG), crude, refined products, coal, grain, and project cargo drive bulk and breakbulk (and energy-terminal) berths independently of the container cycle.
• Environmental modernization. Zero-emission equipment, electrification, and resilience projects are themselves a demand source for cranes, power systems, software, and construction — supported by programs such as the EPA's Clean Ports Program.[23]
• Cruise passengers. For cruise-focused operators, demand follows leisure travel and itinerary growth (Caribbean, Mediterranean).[15]

Port volumes should grow with trade over the long run, but individual gateways can lose share when cargo owners change routes, rail access, vessel services, or distribution-center locations.

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7. Regulation

U.S. ports sit under a patchwork of federal, state, and local authority — no single lead agency — because they combine transportation, industrial, environmental, public-safety, and national-security functions.[6]

• U.S. Army Corps of Engineers (USACE) — builds and dredges/maintains the navigation channels. Without federal dredging, big ships can't reach the berths, so USACE approvals and appropriations are gating for port expansion.[20]
• U.S. Coast Guard (USCG) — port and vessel safety and security under the Maritime Transportation Security Act (MTSA), including facility security plans and inspections; many waterfront workers must hold a Transportation Worker Identification Credential (TWIC).[18]
• Federal Maritime Commission (FMC) — oversees ocean shipping and regulates marine terminal operators (MTOs) in U.S. foreign commerce, which must register and maintain rate schedules where applicable and file certain agreements.[17]
• Occupational Safety and Health Administration (OSHA) — Marine Terminals standards under 29 CFR (Code of Federal Regulations) Part 1917 govern cargo movement, equipment, and landside terminal work.[19]
• Maritime Administration (MARAD) and the Harbor Maintenance Tax (HMT) — a 0.125% ad-valorem fee on the value of imported cargo (roughly $109 per 40-foot container) flows into the Harbor Maintenance Trust Fund, which reimburses USACE dredging.[21]
• Environmental Protection Agency (EPA) — Clean Air Act (CAA), Clean Water Act (CWA), and National Environmental Policy Act (NEPA) reviews apply to dredging, construction, stormwater, spills, and emissions; California ports carry especially stringent air-quality mandates.[22]
• Committee on Foreign Investment in the United States (CFIUS) — can review foreign acquisitions, leases, or concessions involving port real estate or sensitive infrastructure.[24]
• State/local port authorities set their own tariffs, leases, environmental rules, and bond programs.

The regulatory theme for investors: ports are permission-dependent infrastructure. Channel depth, environmental clearance, security compliance, foreign-investment review, and labor rules are set outside the operator's control, and a single permit delay or concession renegotiation can alter returns even when national demand is strong.

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8. Competitive dynamics and consolidation

• Local monopoly, national competition. Within a harbor, one or two terminals dominate; but ports compete fiercely across regions for the same discretionary cargo (e.g., Savannah vs. Charleston vs. Norfolk for Southeast imports).[30] The battleground is channel depth, rail connectivity, congestion, reliability, and total delivered cost. National concentration data (HHI 600.8, CR4 41.1%) show a broad industry but do not mean every local market is competitive.[3]
• Global consolidation. A handful of global terminal operators — PSA, Hutchison, APM Terminals, DP World, COSCO — control a large share of world container-terminal capacity and increasingly co-own U.S. terminals alongside ocean carriers.[16]
• Vertical integration. Shipping lines owning terminals is a persistent theme — CMA CGM's U.S. terminal acquisitions and Maersk's APM Terminals are prime examples.[16][34] This can improve network coordination but raises customer concerns about neutrality and access.
• Infrastructure-capital ownership. U.S. terminals have moved steadily into the hands of pension funds and infrastructure investors (e.g., CPP's Ports America), attracted by long leases and stable yields. Expect continued asset trading among these funds rather than IPOs.[12]
• Automation is contested. Terminal automation could cut costs and raise throughput, but is capped by labor agreements on the East and Gulf coasts (below) — a structural brake on U.S. productivity gains versus automated Asian and European ports.[25]

The strongest competitive advantages are physical and contractual — waterfront land, channel access, rail connectivity, labor relationships, customer contracts, and concession rights. They are hard to replicate but can be impaired by poor capital allocation or loss of a concession.

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9. Risks

• Cyclicality and trade shocks. High fixed costs mean volume downturns hit hard; a trade war, recession, tariff, sanction, or inventory glut cuts throughput quickly.
• Labor disruption. Dockworker unions are powerful. The October 2024 strike by the International Longshoremen's Association (ILA) against the United States Maritime Alliance (USMX) shut 36 East and Gulf Coast ports for three days, with estimates near $5 billion/day in disruption before a deal.[25][26] The contract delivered a ~62% wage increase and labor peace to 2030 — but capped automation, and the next negotiation is a known cliff.
• Trade-policy whiplash. In 2025 the U.S. Trade Representative (USTR) imposed Section 301 port-entry fees on Chinese-built and Chinese-operated vessels (starting $50/net ton in October 2025, scheduled to rise toward $140 over three years) — then suspended them for one year effective November 10, 2025.[27][28] Rules can appear and vanish, scrambling vessel routing and port economics.
• Catastrophic single-point failure. The March 2024 Francis Scott Key Bridge collapse blocked the Port of Baltimore's main channel for 11 weeks (~$15 million/day impact), showing how one accident can idle a major gateway. Congestion, cyberattacks, and channel closures pose similar concentrated risks.[29]
• Capital intensity / stranded assets. Deepening a channel runs $500 million to nearly $1 billion (Savannah's last dig reached 47 feet for ~$973 million; Charleston reached 52 feet, the East Coast's deepest, for ~$580 million).[30] Miss the vessel-size race and traffic migrates elsewhere. Dredging delays, cost overruns, and equipment failures compound the risk.
• Environmental and climate exposure. Emissions mandates, contaminated-sediment liabilities, spills, community opposition, sea-level rise, and storm/seismic risk raise costs and threaten waterfront assets.
• Concentration and counterparty risk. A landlord port depends on a few large terminal tenants and a few ocean-carrier alliances; losing one can gut utilization.
• Governance and financing risk. Public-sector political intervention, concession-renewal risk, foreign-investment restrictions, and interest-rate/refinancing risk all bear on these capital-heavy assets. Matson's own filings flag that terminal modernization, aging infrastructure, severe weather, and construction cost overruns can hit cash flow even when shipping demand is intact.[14]

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10. How to invest and the outlook

Public-market routes (equity):

• Foreign-listed global operators — Maersk/APM Terminals (Copenhagen), COSCO Shipping Ports (Hong Kong), ICTSI (Manila), Adani Ports (India), Global Ports Holding for cruise (London). Diversified terminal exposure, but with country, currency, and carrier-cycle risk.[15][16]
• U.S.-listed proxies — Matson (NYSE: MATX), a U.S. carrier with a 35% stake in a leading West Coast operator, is the closest thing to a U.S. port play but is primarily a shipping company;[14] energy MLPs Enterprise Products (EPD) and Global Partners (GLP) and tank-storage operator Vopak (VPK) own marine terminals but are dominated by midstream/fuel businesses.[31][32][33]
• There is no clean U.S.-listed pure-play — say so plainly to anyone expecting one. For any listed name, check what share of earnings is actually tied to terminal assets, owned vs. leased/concession capacity, concession length and escalators, revenue per unit of throughput, customer concentration, capex, labor and environmental liabilities, and debt coverage.

Private / fixed-income routes:

• Infrastructure funds and pension co-investments — how most institutional capital actually owns U.S. terminals (the Ports America / CPP model). Diligence the concession contract, remaining term, minimum-volume commitments, rent structure, union agreements, environmental history, capex plan, customer mix, and exit options.[12]
• Municipal port revenue bonds — tax-exempt debt of public port authorities, backed by lease rents, wharfage, and dockage; a lower-risk income route tied to a specific gateway. Key questions: traffic diversity, debt-service coverage, rate-setting authority, capital needs, and concession stability.[6][40]
• Direct terminal concessions / leases, private credit, and equipment finance — available mainly to large strategic or infrastructure investors.

Near-term drivers (forward-looking):

• Labor peace through 2030 on the East/Gulf coasts removes a major near-term disruption risk but caps automation, so the U.S. productivity gap versus overseas ports likely persists.[25]
• Trade-policy volatility — the on-again/off-again Section 301 vessel fees and the broader "Restoring America's Maritime Dominance" push mean routing and cost assumptions can change fast; watch the 2026 fee-suspension expiry.[27][28]
• Capacity and deepening arms race — Southeast and Gulf ports keep investing to capture East Coast cargo and handle ever-bigger ships, a multi-year tailwind for dredging, cranes, and rail.[30]
• Resilience premium — post-Baltimore and post-pandemic, redundancy, reliability, and multi-gateway routing are valued more highly, favoring well-capitalized, well-connected ports.

Judgment: as an asset class, U.S. port operations are a defensive, infrastructure-style, income-oriented exposure — attractive contracted cash flows on irreplaceable land, but cyclical at the margin and politically/labor-sensitive. The long-term outlook is durable but uneven: returns depend more on selecting the right gateway, concession, and capital structure than on broad industry growth. And the structural reality for a general investor is that the best U.S. exposure is private or fixed-income, while listed equity means buying a foreign operator, a shipping company, or an energy-midstream firm. That is a feature of how the U.S. chose to own its ports — publicly — not a temporary quirk.

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Sources

1. U.S. Census Bureau, "2022 NAICS Definition: 488310 Port and Harbor Operations" (inclusions and exclusions; cross-references to 488320, 488330, 713930). https://www.census.gov/naics/?details=488310&year=2022
2. U.S. Census Bureau, County Business Patterns, NAICS 488310 (2023) — establishments, employment, payroll. (Histometrics ingested federal statistics.) https://www.census.gov/programs-surveys/cbp.html
3. U.S. Census Bureau, Economic Census / Concentration of Largest Firms, NAICS 488310 (2022) — firms, receipts, CR4/CR8/CR20/CR50, HHI. (Histometrics ingested federal statistics.) https://www.census.gov/programs-surveys/economic-census.html
4. U.S. Census Bureau, "County Business Patterns: Coverage and Methodology" (employer establishments; excludes public administration and most government employees). https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
5. U.S. Small Business Administration, "Table of Size Standards" / 13 CFR §121.201, NAICS 488310 — $47 million receipts (2023). https://www.sba.gov/document/support-table-size-standards
6. U.S. Government Accountability Office, "U.S. Port Infrastructure" (GAO-25-107159): >300 U.S. waterside ports; >$2.28 trillion of U.S. international trade in 2022; landlord vs. operating port models (2025). https://www.gao.gov/products/gao-25-107159
7. American Association of Port Authorities (AAPA) / EY, "Port and Maritime Industry Economic Impact Report" — ~$2.9 trillion economic value, ~21.8 million jobs (2024). https://www.aapa-ports.org/
8. Port Economics, Management and Policy / The Geography of Transport Systems, "Public and Private Roles in Port Management" (landlord model, concessions, MAGs) (2024). https://transportgeography.org/contents/chapter6/port-terminals/public-private-roles-ports/
9. American Journal of Transportation / Supply Chain 24/7, "Top U.S. Container Ports 2024" (Los Angeles ~10M TEU; Long Beach ~9.6M TEU) (2024). https://www.supplychain247.com/article/north-america-top-20-container-ports-2024
10. Port Authority of New York and New Jersey, 2024 cargo-volume release (~8.7M TEU; ~$264B in goods) (2025). https://www.panynj.gov/port-authority/en/press-room.html
11. Ports America, "Who We Are" (leading U.S. container terminal operator; ~19M TEU in 2024). https://www.portsamerica.com/who-we-are
12. 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/
13. SSA Marine / Carrix, "About Us" (major privately held terminal operator) (2026). https://www.ssamarine.com/about
14. Matson, Inc., Form 10-K and investor materials — 35% interest in SSA Terminals; terminal/infrastructure risk factors. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000003453&type=10-K
15. Global Ports Holding (LSE: GPH), "Cruise Terminals" (world's largest cruise-port operator). https://www.globalportsholding.com/
16. Freight News / Sinay, "Top Global Container Terminal Operators" (PSA, Hutchison, APM Terminals, DP World, COSCO; DP World and PSA state-owned) (2024). https://sinay.ai/en/top-10-biggest-port-operators-in-the-world/
17. Federal Maritime Commission, "Marine Terminal Operators" (MTO registration and rate schedules). https://www.fmc.gov/marine-terminal-operators/
18. U.S. Coast Guard, "Office of Port and Facility Compliance" — MTSA facility security and TWIC. https://www.dco.uscg.mil/Our-Organization/Assistant-Commandant-for-Prevention-Policy-CG-5P/Inspections-Compliance-CG-5PC-/Port-and-Facility-Compliance-CG-FAC/
19. Occupational Safety and Health Administration, Marine Terminals standards, 29 CFR Part 1917. https://www.osha.gov/laws-regs/regulations/standardnumber/1917
20. U.S. Army Corps of Engineers, "Value to the Nation: Navigation" (~2.3 billion tons of annual cargo movement; dredging). https://www.iwr.usace.army.mil/Missions/Value-to-the-Nation/Navigation/
21. U.S. Maritime Administration (MARAD) and 19 CFR §24.24, "Harbor Maintenance Fee" (0.125% ad valorem; Harbor Maintenance Trust Fund). https://www.maritime.dot.gov/
22. U.S. Environmental Protection Agency, "Ports Primer: Federal Environmental Regulations and Programs" (CAA, CWA, NEPA). https://www.epa.gov/ports-initiative/ports-primer-73-federal-environmental-regulations-and-programs
23. U.S. Environmental Protection Agency, "Clean Ports Program" (zero-emission equipment and infrastructure). https://www.epa.gov/ports-initiative/cleanports
24. U.S. Department of the Treasury, "Committee on Foreign Investment in the United States (CFIUS): Real Estate." https://home.treasury.gov/policy-issues/international/the-committee-on-foreign-investment-in-the-united-states-cfius
25. gCaptain, "Historic ILA-USMX Contract Brings Six Years of Labor Peace" (~62% wage increase; automation limits; Oct 2024–Sep 2030) (2025). https://gcaptain.com/done-deal-historic-ila-usmx-contract-brings-six-years-of-labor-peace-to-east-and-gulf-coast-ports/
26. Supply Chain Dive / GEODIS, coverage of the October 2024 ILA port strike (36 ports; ~$5B/day estimate) (2024). https://www.supplychaindive.com/news/port-strike-usmx-ila-tentative-agreement/728901/
27. Office of the U.S. Trade Representative, "Section 301 Action on China's Targeting of the Maritime, Logistics, and Shipbuilding Sectors" (port fees on Chinese-built/operated vessels) (April 2025). https://ustr.gov/about/policy-offices/press-office/press-releases/2025/april/ustr-section-301-action-chinas-targeting-maritime-logistics-and-shipbuilding-sectors-dominance
28. Holland & Knight, "USTR Port Fee Suspension: What You Need to Know" (one-year suspension effective Nov. 10, 2025) (2025). https://www.hklaw.com/en/insights/publications/2025/11/ustr-port-fee-suspension-what-you-need-to-know
29. PBS NewsHour / reporting on the Francis Scott Key Bridge collapse (Mar. 26, 2024; channel blocked ~11 weeks; ~$15M/day) (2024). https://www.pbs.org/newshour/nation/baltimore-bridge-collapse
30. South Carolina Ports Authority / Atlanta Journal-Constitution, Charleston (52 ft, ~$580M) and Savannah (47 ft, ~$973M) harbor deepening (2022–2024). https://scspa.com/news/charleston-has-deepest-harbor-on-east-coast-at-52-feet/
31. Enterprise Products Partners L.P. (NYSE: EPD), Form 10-K — marine terminals for NGLs, crude, petrochemicals, refined products. https://ir.enterpriseproducts.com/
32. Global Partners L.P. (NYSE: GLP), Form 10-K — liquid-energy terminals connected to marine, rail, and pipeline assets. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001323468&type=10-K
33. Royal Vopak (Euronext Amsterdam: VPK), "Vopak Terminal Deer Park (Houston)." https://www.vopak.com/terminals/vopak-terminal-deer-park-houston
34. CMA CGM, "CMA Terminals: Global Network" — U.S. assets including Port Liberty and Fenix Marine Services. https://www.cmacgm-group.com/en/group-and-vision/our-activities/terminals
35. APM Terminals / A.P. Møller–Maersk (Nasdaq Copenhagen: MAERSK-B), "Our Company" (U.S. terminals). https://www.apmterminals.com/en/about/our-company
36. Maher Terminals, "About" (privately held container terminal, Port of NY/NJ). https://www.maherterminals.com/
37. The Pasha Group / Pasha Stevedoring & Terminals, "Company Overview." https://www.psterminals.com/
38. Crowley, "Company Overview" (privately held U.S. maritime and logistics company). https://www.crowley.com/company-overview/
39. Gulftainer / GT USA, "About Us" (privately owned international operator with U.S. concessions). https://www.gulftainer.com/about-us/
40. Port Authority of New York and New Jersey, Marine Terminal Tariff, and Port Economics "Port Pricing" (dockage, wharfage, demurrage, MAGs) (2024–2026). https://www.portauthoritybuilds.com/content/port/en/doing-business/tariffs.html