Water Transportation (U.S.) — NAICS 483 (subsector rollup)

A short rollup primer for a general investing audience — relevant to both public-market and private investors. NAICS (North American Industry Classification System) is the U.S. government's standard scheme for grouping businesses by activity; each added digit narrows the category. This three-digit subsector rolls up two four-digit industry groups — 4831 (ocean, coastal and Great Lakes) and 4832 (inland rivers and canals) — and its distinctive value is the contrast between them. Federal figures are reported facts with citations; forward-looking statements are worded as judgments. All figures for this level are the ground-truth NAICS 483 stats from our federal file [1][2]; deeper company and market detail comes from the two child primers [8][9].

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1. Overview

NAICS 483 is everything that moves cargo and people over water in the United States — from container ships and ocean cruise liners on the high seas, to the Jones Act coastal fleet, to Great Lakes ore carriers, down to the towboats pushing grain and fuel barges up the Mississippi and the ferries crossing a harbor. It is a ~$52 billion-revenue subsector run by roughly 1,300 firms employing about 63,000 people directly [1][2].

The single most useful thing to understand about this level is that it staples together two structurally different water-transport worlds that happen to share a NAICS code:

• 4831 — Deep Sea, Coastal & Great Lakes: the big-ship, salt-water-and-big-lake business. Larger firms, more concentrated, and home to the sector's deepest pool of listed equity (ocean cruise) and its most valuable protected assets (the Jones Act coastal fleet). About 84% of the subsector's revenue [1][3].
• 4832 — Inland: the river-and-canal barge business plus small passenger boats. Smaller, more fragmented, overwhelmingly private, family- and captive-owned, and dominated by cyclical bulk freight. About 16% of revenue [1][4].

They differ on almost every axis that matters to an investor — size, ownership, how they make money, who regulates the details, and how (or whether) you can buy in. The rest of this page leads with that contrast, then covers the level as a whole. For the full analysis of either world — company-by-company detail, economics, and the trades — read the two child primers [8][9].

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2. What's inside — the two children and how they differ

The subsector's two industry groups are near-opposites. This table is the core of the page:

(HHI = Herfindahl-Hirschman Index, the standard antitrust concentration gauge — higher means fewer, bigger players; ETF = exchange-traded fund.)

A few contrasts are worth spelling out:

• Size and firm scale. Ocean/Great Lakes is ~5x the revenue of inland but only ~1.3x the firm count, so its average firm is roughly four times larger ($59M vs. $15M of revenue) [3][4]. Inland is a business of many small, often family-run operators; ocean is a business of a few large ones plus a foreign-owned fringe.
• Concentration. The larger child is moderately concentrated (HHI 1,081) while inland is unconcentrated (HHI 735) [3][4]. Both figures are national statistical averages that hide much tighter competition lane-by-lane and commodity-by-commodity.
• Ownership and access. In 4831, the value an ordinary investor can actually buy sits mostly in ocean cruise (a listed global oligopoly). In 4832, the value sits in freight barging, which is almost entirely private, private-equity, or captive (shippers like grain and cement makers moving their own product) — so there is no clean listed way in [3][4][8][9].
• What drives the money. Both are capital-intensive and cyclical, but ocean adds the demand-elastic cruise consumer and global charter-rate cycles, while inland is pure derived demand — barge freight rises and falls with grain, energy and construction volumes on the river [8][9].

The real internal diversity lives one more level down: 4831's single five-digit child (48311) splits four ways (deep-sea freight, ocean cruise, Jones Act coastal freight, and domestic ferries/small cruises), and 4832's single child (48321) splits into freight and passenger. Both child primers carry that detail [8][9].

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3. How big it is (this level's rollup figures)

These are the U.S. Census Bureau ground-truth figures for NAICS 483. Receipts, firm count and concentration are from the 2022 Economic Census (EC); establishments, employment and payroll are from 2023 County Business Patterns (CBP) — so this is not a single clean year [1][2].

(CR4 = combined revenue share of the four largest firms, and so on.) The children's establishment, employment and payroll figures sum exactly to the level totals; the firm counts sum to 1,307 against 1,301 reported for the level — a ~6-firm rounding artifact of the Economic Census, not a suppressed value [1][2][3][4].

Two comparative signals fall out of the split. Ocean/Great Lakes generates roughly $1.05 million of revenue per employee against inland's ~$0.39 million — the salt-water world is far more revenue-dense per worker, reflecting cruise ticket economics and large-vessel scale (receipts are 2022, employment 2023, so treat as approximate) [1][2]. Pay is skilled across both: average payroll runs about $117,000 per employee in 4831 and ~$92,000 in 4832 — these are unionized, licensed merchant mariners and skilled shore staff, not low-wage labor [1].

One counter-intuitive point: the blended level HHI (786.4) is lower than the larger child's (1,081.5) [2][3]. Pooling two markets dilutes each big firm's share of the combined total, so 483 looks "unconcentrated" even though its dominant segment is not — a reminder that the subsector figure is a statistical blend, not a real competitive market.

The undercount caveat — read this before trusting $52.22 billion. This figure counts only U.S. employer establishments classified here, and it understates the sector's true economic weight in five compounding ways: (1) the foreign container lines that move most U.S. import/export trade (Maersk, MSC, CMA CGM, Hapag-Lloyd, COSCO) book their revenue abroad [8]; (2) U.S.-listed cruise, tanker, bulk and gas owners run their ships through foreign-flag subsidiaries — Carnival Corporation alone booked $26.6 billion in fiscal 2025, more than half the entire U.S. rollup, yet only its U.S. footprint lands here [10]; (3) governments are excluded entirely, so the public ferry authorities carrying roughly 105.8 million passengers a year are invisible to business statistics [11]; (4) captive shipper fleets — when a grain, cement or chemical company moves its own product on its own barges, that tonnage is usually booked under the parent's primary industry, not here [9]; and (5) CBP omits nonemployer owner-operated boats and the self-employed. So $52.22 billion is best read as the U.S. corporate-and-operating footprint of a sector whose true weight — global freight flows, global cruise revenue, public ferry ridership, captive tonnage — is many times larger. Our federal file reports no fleet size, freight or fare rates, fuel cost, utilization, or cargo volumes for this level; those come from company disclosures, not the NAICS statistics.

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4. The investable universe (where value concentrates)

Across the whole subsector, listed value clusters in a narrow band, and it clusters differently in each child:

• In 4831 (ocean/Great Lakes), the public value is ocean cruise — the deepest pool of listed equity in all of water transportation: Carnival, Royal Caribbean, Norwegian Cruise Line Holdings, Viking and Lindblad. Domestic Jones Act freight offers essentially one large listed name (Matson), with the marquee operators (Crowley, Saltchuk/TOTE, Pasha, Interlake) private; international tanker/bulk/gas exposure is a set of foreign-flagged, often foreign-listed cyclicals [3][8].
• In 4832 (inland), the public value is a single freight handle — Kirby Corporation, the largest U.S. inland tank-barge operator — plus indirect exposure through agriculture and energy names (e.g., Archer-Daniels-Midland, Genesis Energy) and a diluted river-cruise proxy (Viking). There is no clean inland pure-play and no inland ETF; most of the money sits in private, family and captive hands [4][9].

The through-line for the whole level: value concentrates where the customer is discretionary and global (cruise), or where the asset is scarce and legally protected (Jones Act tonnage) — and it hides in private ownership everywhere the cargo is bulk commodities. Tickers, yields and multiples are reserved for the child primers, which map each segment company-by-company [8][9].

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5. How the money works

Every business at this level is capital-intensive: it owns or finances long-lived, expensive vessels and earns a spread over the cost of running them. But the earnings engine differs by segment [8][9]:

• Ocean cruise earns a net yield per berth-day (revenue per available bed) over cost per berth-day, on a debt-financed fleet, using pre-paid customer deposits as float.
• International freight lives on charter rates and vessel asset-trading, measured in Time Charter Equivalent (TCE — daily earnings net of voyage costs).
• Domestic freight (Jones Act coastal, Great Lakes, and inland barges) earns utilization × rate on scarce, protected U.S.-built hulls — the U.S.-build requirement is both a cost burden and a moat, and the supply cycle is the whole game: new U.S. vessels are costly and slow to build, so fleet size adjusts sluggishly and rates swing in multi-year booms and busts.
• Passenger ferries chase cost recovery, not profit — the gauge is the farebox recovery ratio (share of operating cost covered by fares), topped up by public payments and grants; river cruising is a small, high-operating-leverage niche (berths × occupancy × ticket yield).

Across all of it, the discipline is the same: reconcile headline EBITDA (earnings before interest, taxes, depreciation and amortization) back to cash flow after maintenance capital spending and drydock, and judge names on through-cycle cash generation rather than a single strong or weak year.

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6. What drives demand

The two children rarely peak together, which is the point of holding them in one frame [8][9]:

• 4831 (ocean/Great Lakes): global trade and ton-miles (cargo × distance) drive international freight; discretionary travel and demographics drive cruise — a record 37.2 million passengers sailed globally in 2025, with supply capped by shipyard throughput [12]; non-contiguous economies (Hawaii, Alaska, Puerto Rico, Guam import nearly everything by sea) drive Jones Act coastal freight.
• 4832 (inland): demand is derived — barge freight tracks grain exports (much of it down the Mississippi at harvest), Gulf-Coast energy and petrochemicals, coal (a structural decliner), and construction materials; passenger splits between commuter/necessity ferries and an affluent, aging river-cruise cohort.

The two shared exposures are the fleet supply side (in every segment, a demand boom met by a wave of newbuilds still crushes returns) and the water itself — droughts, floods, ice, hurricanes and canal chokepoints disrupt loading and itineraries alike, a hard-to-hedge risk that binds the whole subsector.

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7. Regulation

Water transportation is one of the most heavily regulated corners of the economy, and one framework binds both children: cabotage law. The Jones Act (Merchant Marine Act of 1920) reserves domestic cargo — coastal, Great Lakes and inland alike — for ships that are U.S.-built, -flagged, -owned and -crewed, and the Passenger Vessel Services Act of 1886 (PVSA) does the same for domestic passengers [5][6]. This single moat underpins the economics of the entire domestic fleet in both 4831 and 4832 [8][9].

Beyond that, the rulebooks diverge by segment: international liner freight answers to the Federal Maritime Commission (FMC); ocean cruise leans on the Section 883 tax exemption for foreign-operated ships and on the International Maritime Organization (IMO), whose tightening carbon rules (a 2050 net-zero target, plus the EEXI/CII efficiency regime) are the defining forward cost driver for ocean-going tonnage [8]. Inland freight depends less on IMO and more on U.S. Coast Guard (USCG) inspection (Subchapter M for towing vessels) and on the U.S. Army Corps of Engineers locks, dams and dredging, funded partly by the barge-industry-paid Inland Waterways Trust Fund [9]. Passenger ferries in both worlds draw on federal transit and highway ferry grants. Decarbonization hits the ocean children hardest, forcing expensive fleet renewal that larger operators are better placed to fund; the Maritime Administration (MARAD) runs the U.S.-flag support programs that touch both.

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8. Consolidation

The level's blended figures — HHI 786.4, CR4 47.5% — sit below the 1,000 line the U.S. Department of Justice's 2023 merger guidelines treat as "unconcentrated" [2][7]. But that average is misleading across two unlike markets, and the averaging is exactly what pulls the number down:

• 4831 is moderately concentrated (HHI 1,081) [3], and inside it ocean cruise is a near-complete global oligopoly (segment CR4 ~98%) while international freight is a container-liner oligopoly beside a fragmented tanker/bulk sector.
• 4832 is unconcentrated (HHI 735) [4], with freight more concentrated and actively consolidating (e.g., Marquette's parent agreeing to acquire Canal Barge in 2025) and passenger more fragmented apart from a genuine oligopoly in overnight river cruising.

The standing caveat: NAICS 483 is a statistical category, not an antitrust market. Real competition is often far tighter than any national figure suggests — by trade lane, commodity, waterway, or route [7]. See each child primer for the segment-by-segment split [8][9].

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9. Risks

The subsector's risks are the shared risks of both children [8][9]:

• Cyclicality and overcapacity — freight rates and cruise yields fall hard when newbuilds outrun demand (ferries are the steady exception).
• Balance-sheet leverage — vessels are debt-financed sector-wide.
• Fuel and decarbonization capex — heaviest on the ocean side.
• Policy risk — the Jones Act, PVSA and Section 883 tax exemption each underpin a segment's economics; erosion of any would reprice that business (two-edged for incumbents).
• Weather, water and chokepoints — river levels and ice on the inland side (the 2022 Mississippi low water backed up ~2,000 barges), Red Sea / Panama Canal disruption on the ocean side.
• Aging infrastructure — much of the inland lock-and-dam network is past its 50-year design life.
• Government-budget and grant dependence — for the public ferry systems in both children.
• Fleet aging, shipyard scarcity and a licensed-mariner shortage.
• Undercount and private-market opacity — much of the real activity is foreign-flagged, privately held, captive, or governmental, so disclosure is thin and valuation harder than in most industries.

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10. How to invest, and the outlook

There is no single "water transportation" trade — you have to pick the child, then the segment inside it [8][9]:

• 4831 (ocean/Great Lakes) offers the deepest public access via ocean cruise, a single Jones Act franchise (Matson) plus private coastal tonnage, and foreign-listed tanker/bulk cyclicals for the international freight cycle.
• 4832 (inland) offers one best listed handle on freight health (Kirby) — read its barge-utilization and spot-rate commentary — with agriculture/energy names as indirect exposure and a diluted river-cruise proxy; otherwise it is a private-market business (direct fleet ownership, private-equity platforms, family roll-ups, captive economics, and vessel-secured credit).

Cross-cutting discipline: compare names on normalized, through-cycle cash flow (enterprise value to normalized EBITDA, free-cash-flow yield, net asset value, fleet age, orderbook growth, contract coverage, and the share of earnings actually tied to the activity in question). Dividend yields and price multiples are unreliable when freight rates or cruise yields are unusually high or low.

Outlook (forward-looking judgment). The children are not aligned, which is the case for owning the contrast rather than the average:

• Ocean cruise enters 2026 with the strongest setup — record demand against shipyard-capped supply — tempered by leverage and Section 883 tax risk.
• Coastal and Great Lakes freight is mixed: tight coastal tankers, softer Great Lakes bulk.
• International freight stays cyclical, currently reroute-supported, and watching proposed U.S.-flag revival legislation (the SHIPS for America Act).
• Inland freight came out of 2025 constructive — utilization in the low-to-mid-90s and firming rates on a tight, slow-to-grow fleet.
• Passenger is two-speed across both children — flat, subsidy-dependent ferries alongside a small river/ocean cruise niche throttled more by shipyard and mariner capacity than by demand.

Bottom line. NAICS 483 is two water-transport worlds under one code: a large, moderately concentrated, partly-listed ocean and Great Lakes business (~84% of revenue, where cruise and Jones Act tonnage hold the value) stapled to a smaller, fragmented, almost-entirely-private inland barge business (~16%, where the value is in bulk freight you mostly cannot buy on an exchange). Strategically it is the physical backbone of U.S. trade, tourism and island life; as an investment it is not one thing. Pick the child before you pick the trade — and for the full picture of either, read the 4831 and 4832 primers [8][9].

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Sources

1. U.S. Census Bureau, County Business Patterns (NAICS 483 and children), 2023 — establishments, employment, annual and Q1 payroll (and nonemployer/coverage caveat). https://www.census.gov/programs-surveys/cbp.html
2. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms (NAICS 483) — receipts, firm count, CR4/CR8/CR20/CR50, HHI. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
3. U.S. Census Bureau, 2022 EC / 2023 CBP — NAICS 4831 (Deep Sea, Coastal & Great Lakes Water Transportation) — child-level receipts, firms, employment, payroll, CR ratios, HHI (via the 4831 child primer). https://data.census.gov/
4. U.S. Census Bureau, 2022 EC / 2023 CBP — NAICS 4832 (Inland Water Transportation) — child-level receipts, firms, employment, payroll, CR ratios, HHI (via the 4832 child primer). https://data.census.gov/
5. U.S. Customs and Border Protection, The Jones Act & The Passenger Vessel Services Act (PVSA; 46 U.S.C. §55103). https://www.help.cbp.gov/s/article/Article-1004?language=en_US
6. Congressional Research Service, Shipping Under the Jones Act: Legislative and Regulatory Background, R45725. https://www.congress.gov/crs-product/R45725
7. U.S. Department of Justice, Herfindahl-Hirschman Index / 2023 Merger Guidelines (unconcentrated below HHI 1,000; NAICS categories are not antitrust markets). https://www.justice.gov/atr/herfindahl-hirschman-index
8. Histometrics, Deep Sea, Coastal, and Great Lakes Water Transportation (NAICS 4831 / 48311) primer — ocean cruise, international tanker/bulk/liner freight, Jones Act coastal freight, ferries; IMO decarbonization; company detail. Underlying: U.S. Census 2022 EC & 2023 CBP; UNCTAD Review of Maritime Transport 2024/2025; CLIA; company 10-Ks.
9. Histometrics, Inland Water Transportation (NAICS 4832 / 48321) primer — barge freight, captive fleets, river cruising, ferries; Inland Waterways Trust Fund; Subchapter M; company detail. Underlying: U.S. Census 2022 EC & 2023 CBP; U.S. Army Corps of Engineers Waterborne Commerce Statistics; Kirby Corporation 2025 Form 10-K.
10. Carnival Corporation & plc, FY2025 results (record full-year revenue $26.6B; foreign incorporation; Section 883) — via the 4831 primer. https://www.prnewswire.com/news-releases/carnival-corporation--plc-achieves-record-full-year-adjusted-net-income-and-investment-grade-leverage-metrics-reinstates-dividend-302646558.html
11. U.S. Bureau of Transportation Statistics, National Census of Ferry Operators (≈105.8M ferry passengers) — via the child primers. https://www.bts.gov/ncfo
12. Cruise Lines International Association (CLIA), State of the Cruise Industry Report 2026 (37.2M passengers; shipyard-capped supply) — via the 4831 primer. https://cruising.org/resources/state-cruise-industry-report-2026