Warehousing and Storage (United States) — NAICS 4931

A Histometrics rollup primer for public-market and private investors

What this page is. NAICS (the North American Industry Classification System, the U.S. government's standard code for industries) 4931 — Warehousing and Storage is an industry group (a 4-digit code) that gathers four distinct storage businesses under one roof. This page's job is the contrast across those four — how big each is, which way it is growing, who owns it, and how an investor can touch it — and then the level as a whole. For a deep dive on any one child, follow the links to its own primer.

1. Overview

Warehousing and storage is the business of holding and handling other people's goods for a fee. A firm that makes, imports, sells, grows, or trades something pays a storage operator to receive it, keep it safe, and move it back out on demand. The operator earns fees for the space used and the work performed; it does not take ownership of the goods. This is a service-and-infrastructure business — closer to a toll road or a specialized landlord than to a factory — and it sits at the physical crossroads of e-commerce, food, energy, and agriculture.[1]

What makes 4931 interesting to an investor is that the label hides four very different economies. One child stores dry consumer freight and is dominated by the rise of online shopping and by Amazon's in-house network. Another freezes food and is run by two publicly traded landlords. A third holds the nation's grain harvest and is controlled by private merchants and farmer cooperatives. The fourth is a grab-bag of oil tanks, document vaults, and whiskey rickhouses that mostly lives inside energy pipelines and one records-storage company. They share a business model — capacity, occupancy, and fees — but almost nothing about their ownership, cyclicality, or how you invest in them is the same. The rollup value is in seeing those differences side by side.

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

NAICS nests from broad to narrow: sector (2-digit) → subsector (3-digit) → industry group (4-digit, this level) → industry (5-digit) → national industry (6-digit). Industry group 4931 splits into four 5-digit industries, each of which happens to have a single 6-digit child of the same name — so at the child level the 5- and 6-digit codes are interchangeable.[1]

The four are wildly unequal. General warehousing alone is ~70% of the group's for-hire revenue and ~92% of its jobs; the other three split the rest. But the small children are far more capital-intensive per worker, more concentrated, and reach public markets more cleanly. The table below is the heart of this page.

¹ Receipts and employment shares computed from the federal figures in §3 (receipts from the 2022 Economic Census; jobs from 2023 County Business Patterns). ² Share of for-hire receipts held by the four largest firms, 2022 Economic Census. Tickers appear only in §4 and §10.

Four ways to read the contrast:

• Size is lopsided, and the "jobs" and "revenue" pictures disagree. General warehousing is ~92% of the group's headcount but only ~70% of its for-hire revenue. That gap is not an error — it is Amazon and other retailers counting their in-house fulfillment workers here while their in-house fulfillment revenue is booked to retail, not warehousing. The three smaller children look far more capital-intensive per employee precisely because they have fewer captive workers muddying the count.
• The group looks fragmented, but only because its biggest child is. At the group level the four-largest-firm share is just 18.5% and the concentration index is low (§3). Yet refrigerated storage is genuinely concentrated (top four ≈ 51%), and other storage is top-heavy too (≈ 43%). The group reads as fragmented because dry warehousing — three-quarters of it — is itself a long tail of small operators.
• Ownership models barely overlap. Refrigerated and records storage reach public markets cleanly through REITs (real estate investment trusts — companies that own income-producing property and pay most of their profit out as dividends). Bulk-liquid storage reaches them through energy midstream and MLPs (master limited partnerships — pipeline/terminal partnerships that issue K-1 tax forms). General and farm-product storage barely reach them at all: the first is dominated by private operators and captive networks, the second by private merchants and farmer cooperatives.
• The cycles are not synchronized. Dry and cold warehousing are both working off a 2021–23 construction glut. Grain storage is tight (record harvests, scarce space). Bulk-liquid storage swings on the oil-price curve and energy-security stockpiling. A single "warehousing" bet blends four different clocks.

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

These are NAICS 4931's own federal figures from our ingested ground-truth data. They come from two different programs and reference years, so treat them as a set of indicators, not one synchronized income statement.

Concentration, 2022 Economic Census: the four largest firms held 18.5% of receipts, the top eight 27.8%, the top twenty 39.0%, and the top fifty 48.2%. The Herfindahl-Hirschman Index (HHI, a standard concentration gauge where anything under 1,500 counts as "unconcentrated") was 147.9 — very fragmented at the group level.[3] As §2 notes, that low reading is a blend: it masks a genuinely concentrated refrigerated segment.

A useful cross-check (and one caveat) on firm counts. The children's establishment and employment figures sum exactly to the group totals (16,753 + 1,376 + 722 + 2,670 = 21,521 establishments; 1,514,034 + 66,236 + 6,190 + 62,178 = 1,648,638 jobs). But the four children's firm counts sum to 9,707, above the group's 9,473 — because a company that operates in more than one storage sub-industry is counted once at the group level. Firms span children; establishments and jobs do not.

Undercount caveat — and it is large. Every one of these numbers understates the real storage economy, and each child undercounts for a different reason:

• Captive operations. In general warehousing, every distribution center a retailer or manufacturer runs for its own goods is scored to the parent's industry, not here — Amazon's network above all, estimated at roughly a third of dry-warehousing headcount.[4] The ~$60B receipts figure is the size of the third-party (for-hire) market; the 1.6M jobs are closer to the physical warehousing workforce. Do not combine the two into one market size.
• On-farm and merchant storage. In farm-product storage, more than half the nation's ~25.5 billion bushels of grain capacity sits in on-farm bins counted as farming, and the biggest commercial elevators are reclassified as grain merchants (NAICS 424510).[8] The ~$1B here is the independent fee-for-storage niche, not the footprint of U.S. grain storage.
• In-house energy storage and self-storage. In other storage, oil and chemicals held by refiners, traders, and pipelines that take title are counted as wholesale or midstream, not here; consumer self-storage sits in real estate (NAICS 531130).[3]

And across all four, County Business Patterns and the Economic Census cover employer establishments and largely exclude government facilities and the smallest non-employer operators, so individual and small-business ownership — pervasive in dry warehousing and grain elevators — is partly outside these counts.[3][13][14] Our federal extract carries no national square-footage, utilization, or profitability figure, so none is stated here.

4. Investable universe (where value concentrates across the children)

The single most important fact for a stock investor: there is no large, clean, publicly traded "warehousing" company that maps to NAICS 4931. Value concentrates in different places in each child, and most of it is private.

• Where the public money actually is — the cold and records corners. The cleanest listed exposure in the whole group is in refrigerated storage (child 49312): Lineage, Inc. (Nasdaq: LINE), the world's largest temperature-controlled warehouse REIT, and Americold Realty Trust (NYSE: COLD). On the records side of other storage (child 49319), Iron Mountain (NYSE: IRM) is a records-and-data-center REIT. These are the three names where a general investor can buy something close to a pure play.
• Bulk-liquid storage is buried inside energy midstream. The oil, fuel, and chemical tank farms in child 49319 mostly sit within Kinder Morgan (NYSE: KMI), Energy Transfer / Sunoco (NYSE: ET / SUN), and Global Partners (NYSE: GLP) — several structured as MLPs. Royal Vopak (Amsterdam: VPK) is the purest listed tank-storage play but is foreign-listed.
• Dry warehousing has proxies, not pure plays. In child 49311, the closest listed operator is GXO Logistics (NYSE: GXO), an asset-light contract-logistics firm; C.H. Robinson and J.B. Hunt add warehousing to freight. The big "warehouse stocks" people name — Prologis, Rexford, First Industrial, STAG, EastGroup, Terreno — are industrial landlords (NAICS 531120), not warehousing operators. They are a demand proxy, not the industry itself.
• Farm storage barely lists at all. In child 49313, the best storage economics are held by private merchants (Cargill, Louis Dreyfus) and farmer cooperatives (CHS, GROWMARK) that outside shareholders cannot buy. Public exposure runs through diversified agribusiness — most directly The Andersons (Nasdaq: ANDE), more diffusely Archer-Daniels-Midland (NYSE: ADM) and Bunge Global (NYSE: BG).

The through-line: the deepest, most durable storage assets in this group are overwhelmingly private — Amazon's captive network and Blackstone's Link Logistics in dry; Stonepeak/GIC/EQT-backed operators in cold; Cargill and the co-ops in grain; Brookfield/IFM/Vopak in liquids. Public markets offer a partial, curated slice.

5. How the money works

Under the differences sits one shared engine: revenue ≈ capacity × occupancy × storage rate, plus handling and value-added fees. Storage rent (per pallet position, cubic foot, or tank barrel) is the recurring, high-margin annuity; handling and throughput fees (receiving, picking, packing, blast-freezing, cross-docking) scale with volume; value-added services (kitting, labeling, returns, freezing, blending) carry the best margins. The cost base is largely fixed — land, buildings, racking or tanks, refrigeration, security, compliance — so utilization is the swing variable, and incremental volume drops almost straight to profit above a facility's break-even occupancy.

But the economics that matter to an investor differ by child, and this is where forcing one framework onto the group goes wrong:

• Refrigerated and records operators are REITs, so the metric is FFO/AFFO (funds from operations / adjusted funds from operations — cash earnings that add back real-estate depreciation), most of it paid out as dividends. Reported net income understates them because depreciation is heavy.
• Dry warehousing is a thin-margin, labor-intensive service business where scale, engineering, and automation — not owning the real estate — are the edge. It is not a rate-base or FFO story; the landlord economics belong to the sibling REIT code.
• Grain elevators layer a merchandising business on top of storage: beyond the storage "toll," integrated operators earn carry (capturing the spread when deferred crop-futures prices sit above nearby ones) and basis trading, and their single biggest cost is the interest on financed inventory.
• Bulk-liquid terminals live on the shape of the oil-price curve — contango (future prices above spot) fills tanks; backwardation empties them — plus long, take-or-pay contracts.

So one revenue formula, four profit engines. Do not apply refrigerated-REIT FFO to a dry 3PL, or grain-carry economics to an oil terminal.

6. Demand drivers

Because the children serve different end-markets, their demand pulls from different places:

• General warehousing rides e-commerce — the biggest structural tailwind in the group (online sales were $326.7B in Q1 2026, up 9.8% year over year and 16.9% of retail, and fulfillment uses roughly three times the warehouse space per dollar of store retail)[5] — plus goods consumption, the shift from just-in-time to just-in-case inventory, outsourcing to logistics contractors, nearshoring, and import/port volumes.
• Refrigerated rides food consumption, frozen and online-grocery habits, protein production and trade, and a growing pharmaceutical cold chain; its near-term swing factor is the post-pandemic inventory de-stocking cycle.
• Farm-product rides the size of the harvest and the shape of the crop-futures curve (a wide "carry" pulls grain into commercial tanks), plus export pace, biofuel and crush demand, and trade policy.[8]
• Other rides commodity price structure and volatility (contango and stockpiling fill oil tanks), energy-security policy, biofuel and ammonia tankage, and — for records — regulatory retention rules (tax, litigation holds, HIPAA, Sarbanes-Oxley).

The common thread is that storage demand tracks the volume and volatility of things that must be held between production and use — but the "things" range from sneakers to frozen chicken to diesel to corn, so the group never moves as one.

7. Regulation

None of these businesses is price-regulated like a utility — there is no rate base and no federal tariff on storage fees. The binding rules are about safety, environment, food, security, and tax, and they get heavier as the stored product gets more hazardous:

• General warehousing — lightest touch: OSHA (Occupational Safety and Health Administration) forklift and materials-handling standards and a warehouse-focused enforcement program, labor law, and — increasingly the sharpest friction — local land-use fights over warehouse development.
• Refrigerated — FDA (Food and Drug Administration) rules under the Food Safety Modernization Act, USDA inspection for meat and poultry, and OSHA/EPA process-safety and risk-management obligations for the anhydrous-ammonia refrigerant many facilities use.
• Farm-product — voluntary federal licensing under the United States Warehouse Act (administered by USDA), warehouse receipts as documents of title, and OSHA grain-dust-and-explosion rules.
• Other — EPA spill-prevention (SPCC) and API 653 tank-integrity standards for oil tanks, Coast Guard security for waterfront terminals, and U.S. Customs bonded-warehouse and TTB (Alcohol and Tobacco Tax and Trade Bureau) rules for spirits.

In every case compliance is a real cost but also a moat — the permitting, safety, and food/hazmat regimes that raise costs also keep new entrants out. Full regulatory maps are in each child primer.

8. Consolidation

The group's low concentration (top four ≈ 18.5%, HHI 147.9)[3] hides a barbell that looks different in each child:

The common force is capital: infrastructure and private-equity funds are the marginal buyer in cold, liquids, and increasingly dry, drawn by hard-to-replicate assets and annuity-like cash flows. Expect the top of each child to keep concentrating while a long tail of small operators persists at the bottom.

9. Risks

The group-wide risks are real, but they land unevenly across the children — a point a blended view hides:

• Oversupply / cyclicality. A 2021–23 building wave hit both dry and cold warehousing, pushing U.S. industrial vacancy to roughly 7% and cold-storage vacancy to a 20-year high; both are working it off.[6] Grain storage faces the opposite problem (too little space). Oil tankage swings with the commodity cycle.
• Interest rates and asset values. The asset-heavy, REIT-and-infrastructure owners (cold, records, liquids) are the most exposed to rate moves and leverage; the asset-light dry 3PLs less so.
• Labor and safety. Heaviest in dry warehousing (huge, unionizing workforces) and in freezer labor; grain elevators carry dust-explosion and engulfment hazards; tank farms carry spill and fire liability.
• Secular / transition risk. The energy transition is a long-term overhang on petroleum tankage (partly offset by biofuels and ammonia), and the decline of paper pressures records storage (offset by a data-center pivot).
• Classification and disclosure risk — acute at this level. Because public companies bury warehousing inside larger businesses (retail, energy midstream, agribusiness), and because captive and on-farm activity sits outside the codes, simple "warehousing sector" comparisons using these public names are unreliable. Know which child, and which slice of it, a given stock actually represents.

10. How to invest, and the outlook

There is no one-ticket way to own NAICS 4931, and — given how different the children are — that is a feature, not a gap. Match the route to the child:

• Cleanest listed exposure: the two cold-storage REITs, Lineage (LINE) and Americold (COLD), and records REIT Iron Mountain (IRM) — all judged on dividend yield and FFO/AFFO growth, not reported net income. (Cold-storage yields have been elevated mid-cycle as prices fell — treat any figure as of-the-moment.)
• Energy-storage exposure: midstream names with terminal assets — Kinder Morgan (KMI), Energy Transfer/Sunoco (ET/SUN), Global Partners (GLP) — plus foreign-listed Vopak (VPK); mind the MLP K-1 tax friction.
• Dry-warehousing exposure: operator GXO Logistics (GXO) and freight-plus-warehousing names (C.H. Robinson, J.B. Hunt); or the industrial-landlord REITs (Prologis, Rexford, STAG, and logistics-real-estate ETFs — exchange-traded funds) as a demand proxy.
• Farm-storage exposure: diversified agribusiness — The Andersons (ANDE) most directly, ADM and Bunge (BG) more diffusely.
• Private routes — where most of the group actually lives: developing or buying warehouse and cold-storage buildings and sale-leasebacks; real-estate, infrastructure, and private-credit funds; direct ownership of regional operators; and — distinctively in dry warehousing — rolling up sub-scale independent 3PLs, a genuinely fragmented, sub-$34-million-firm landscape (below the SBA — Small Business Administration — size standard) with real consolidation upside.[13]

Outlook. The near-term picture is a group healing at different speeds: dry and cold warehousing digesting an oversupply hangover (more likely to stabilize than deteriorate as the construction pipeline thins), grain storage running tight into record harvests, and energy tankage supported by price volatility and energy-security stockpiling while records storage drifts down slowly. The structural case is more durable than any one cycle — rising e-commerce penetration, higher held inventories, an expanding pharma cold chain, nearshoring, and automation lifting thin labor productivity — and points to a slower-growing but steadily consolidating group where scale, technology, and location decide the winners rather than simply owning more space. None of it is guaranteed. For the full analysis of any child, follow the links in §2.

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Sources

Group-level figures ([2],[3]) are our ingested federal ground truth for NAICS 4931; the remaining sources are drawn from the four child primers.

1. U.S. Census Bureau, 2022 NAICS — 4931 Warehousing and Storage (definitions, hierarchy, and the four children 49311/49312/49313/49319 with their single 6-digit national industries). https://www.census.gov/naics/?input=4931&year=2022
2. U.S. Census Bureau, County Business Patterns: 2023 — NAICS 4931 establishments, employment, annual and first-quarter payroll. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms, NAICS 4931 (firms, receipts, CR4 18.5% / CR8 27.8% / CR20 39.0% / CR50 48.2%, HHI 147.9). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
4. Economic Policy Institute, Unfulfilled promises: Amazon fulfillment centers do not generate broad-based employment growth, 2024 (captive fulfillment headcount). https://www.epi.org/publication/unfulfilled-promises-amazon-warehouses-do-not-generate-broad-based-employment-growth/
5. U.S. Census Bureau, Quarterly Retail E-Commerce Sales: First Quarter 2026. https://www.census.gov/retail/eCommerce.html
6. CBRE, Q1 2026 U.S. Industrial and Logistics Figures (industrial vacancy/availability). https://www.cbre.com/insights/figures/q1-2026-us-industrial-and-logistics-figures
7. Lineage, Inc. and Americold Realty Trust — company filings and disclosures (warehouse counts, cubic feet, segments), 2024–2026. See the 49312 child primer for full citations.
8. U.S. Department of Agriculture, NASS, Grain Stocks / Grain Storage Capacity (Dec. 1, 2024: ~25.48 billion bushels — 13.63 on-farm, 11.85 off-farm), January 2025. https://www.nass.usda.gov/Publications/Todays_Reports/reports/grst0125.pdf
9. The Andersons, ADM, and Bunge Global filings; World Grain, Bunge–Viterra merger completion, 2025. See the 49313 child primer for full citations.
10. Iron Mountain Incorporated, Fourth Quarter and Full Year 2024 Results, 2025. https://www.businesswire.com/news/home/20250213929445/en/Iron-Mountain-Reports-Fourth-Quarter-and-Full-Year-2024-Results
11. Kinder Morgan Terminals; PR Newswire, Sunoco LP to Acquire NuStar Energy L.P., 2024 (midstream terminal consolidation). https://www.prnewswire.com/news-releases/sunoco-lp-to-acquire-nustar-energy-lp-in-transaction-valued-at-7-3-billion-302040392.html
12. GlobeNewswire, Bulk Petroleum and Chemical Storage Industry Report 2026–2035, 2026 (scale of bulk-liquid storage relative to census receipts). https://www.globenewswire.com/news-release/2026/02/26/3245861/28124/en/Bulk-Petroleum-and-Chemical-Storage-Industry-Report-2026-2035-A-51-92-Billion-Market-by-2030.html
13. U.S. Small Business Administration, Table of Size Standards, 2023. https://data.sba.gov/dataset/small-business-size-standards
14. U.S. Census Bureau, Understanding NAICS / Economic Census coverage (employer-establishment scope; government and non-employer exclusions), 2025. https://www.census.gov/programs-surveys/economic-census/year/2022/guidance/understanding-naics.html