Other Pipeline Transportation (U.S.) — NAICS 4869

A Histometrics rollup primer for public- and private-market investors

1. Overview

In the North American Industry Classification System (NAICS, the U.S. government's standard for grouping businesses by what they do), the pipeline sector splits into three industry groups: crude-oil pipelines, natural-gas pipelines, and everything else. NAICS 4869 — Other Pipeline Transportation is that "everything else" group. It covers the buried steel networks that move finished fuels and a short list of non-hydrocarbon products, but not raw crude oil (NAICS 4861) or natural gas (NAICS 4862), which are far larger businesses classified elsewhere.[1]

The group has two children, and they could hardly be more different in size. One — refined-products pipelines (48691) — is a mature, ~$14-billion toll-road business moving gasoline, diesel, and jet fuel across the country. The other — all other pipeline transportation (48699) — is a ~$374-million residual bucket dominated by carbon-dioxide (CO₂) pipelines, tiny today but carrying an outsized growth story tied to carbon capture. Together they form a capital-heavy, labor-light group: roughly $14.4 billion of transportation fees generated by fewer than 100 firms and under 10,000 workers.[3][4]

The unifying economics are toll-road: owners generally do not buy or sell what flows through the pipe — they charge a fee to move someone else's barrels or tons. That makes the cash flows fee-based, largely insulated from commodity prices, and attractive to income-oriented and infrastructure investors. But the two children sit at opposite ends of the maturity curve, and the real value of reading them together is the contrast.

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

NAICS is a nested hierarchy: this four-digit industry group breaks into two five-digit industries, each of which happens to roll up to a single six-digit national industry of the same name (so 48691 = 486910 and 48699 = 486990). The two children share the toll-road chassis but differ on almost everything that matters to an investor — what moves, how big it is, which way it is heading, who owns it, and how you would buy in.

(Acronyms: CR4 = combined revenue share of the four largest firms; HHI = Herfindahl-Hirschman Index, a market-concentration score that rises toward 10,000 as an industry approaches monopoly. "Suppressed" means the federal agency withheld the value because too few firms exist to publish it without exposing individual companies.)

The one-paragraph version: 48691 is the group. It supplies about 97 cents of every revenue dollar and nearly all the jobs. It is a slow, steady, well-understood utility-like business. 48699 is a rounding error today but an option on the future — a tiny existing CO₂ network with a large, contested, policy-dependent expansion story bolted on. An investor allocating across the group is really choosing between durable income (48691) and contingent growth (48699).

3. Size (this level's rollup figures)

The figures below are our ingested ground-truth federal statistics for NAICS 4869 as a whole. They combine two reference years — receipts, firms, and concentration from the 2022 Economic Census; establishments, employment, and payroll from 2023 County Business Patterns (CBP, the Census Bureau's annual business-count series) — so this is a composite, not a single-year financial statement.[3][4]

How the children roll up. The group totals are close to a clean sum of the two children, with one instructive exception. Establishments (849 + 35 = 884) and employment (9,350 + 209 = 9,559) add up exactly. Firms do not: the children report 85 + 18 = 103, but the group counts only 95 — meaning roughly eight firms operate in both children (diversified midstream operators that carry refined products and CO₂ or ammonia), and the group counts each such firm once. Revenue splits about 97% / 3% in refined products' favor. So the group's economics are, to a first approximation, the refined-products business with a small carbon-transport call option attached — which is also why the group HHI (961) sits just below the refined-products child's (~1,007): adding a handful of small "other" firms nudges measured concentration down at the group level even though the "other" segment is itself far more concentrated internally.

Scale in one number: ~$14.4 billion of revenue divided by ~9,600 workers is roughly $1.5 million of revenue per employee — among the most capital-intensive, labor-sparse profiles in the entire economy. Value here is steel in the ground, not people.

Undercount and interpretation caveats. Three points matter before anyone uses these figures:

1. This is transportation revenue only — the tolls to move product, not the value of the fuel or CO₂ itself. It will look tiny next to commercial "market size" reports that bundle in product value or measure global markets.
2. Ownership is blurred by classification. Much national mileage sits in joint ventures or in captive lines owned by integrated refiners and oil majors, whose activity is often reported under a parent's primary industry code (oil-and-gas extraction, crude pipelines, refining) rather than here. The single largest refined-products system (Colonial) is a standalone private company, and most large CO₂ mileage belongs to majors classified elsewhere. So the 95-firm count understates who actually controls the pipe.[2][5]
3. Small-operator undercount is modest — because this is a few-large-owners group, not a fragmented one, the usual "missing tiny firms" distortion is minor. The bigger distortion is structural mis-classification of the majors, above.

The federal file does not report mileage, throughput, utilization, tariffs, capital spending, or profits; those are absent, not suppressed, and are drawn from company filings and safety-agency data in the child primers.

4. Investable universe — where value concentrates across the children

Two facts define the investable landscape, and they hold across both children: there is no publicly listed pure-play in either one, and the largest, purest assets are privately owned.

• In refined products (48691, ~97% of the group), public-market investors get exposure bundled inside larger diversified midstream companies — regular corporations (C-corps) and master limited partnerships (MLPs, publicly traded partnerships that pay no corporate tax and pass income through to their owners) — where refined-products transport is one segment among crude, natural gas, and natural gas liquids (NGL). The largest standalone refined-products systems are private. (The child primer names and sizes them; the short version is that diversified public exposure runs through names such as ONEOK, Kinder Morgan, Energy Transfer, Sunoco LP, MPLX, and Enterprise Products Partners, while the biggest pure systems — Colonial, owned by Brookfield, and Buckeye, owned by IFM — sit inside private infrastructure funds.)[7][8][9][10]
• In all other transportation (48699, ~3%), the closest thing to a pure-play — Denbury Inc., the largest independent CO₂ transport-and-storage network — was acquired by ExxonMobil in 2023, so what remains is a small segment inside diversified majors (ExxonMobil, Kinder Morgan, Occidental), with the genuine dedicated CO₂-pipeline exposure living in private and venture-backed carbon-capture developers.[11]

So "where value concentrates" has a clean answer: almost all the revenue, jobs, and durable cash flow are in the refined-products child, and that is where a listed-equity or income investor will spend their time. The "other" child is where a growth- or theme-oriented investor takes a small, mostly private, higher-variance position. Specific tickers, yields, and valuation multiples belong to individual security analysis and are laid out in the two child primers.

5. How the money works

The shared model is contracted toll-road infrastructure: heavy upfront capital to lay the pipe, then low operating cost and long-lived, fee-based cash flow. This is not a regulated-utility rate base, a real-estate income model, or a mining cost-curve model — those frameworks do not apply here. Owners earn a tariff (a per-unit toll that typically scales with distance and volume), plus storage and terminal fees, and their costs are overwhelmingly fixed once the steel is down, giving high operating leverage on near-monopoly routes.

Where the children diverge is in what makes the cash flow durable — and where the risk enters:

• 48691 (refined products) is the purer toll road. Because the operator moves product it does not own, cash flow is largely commodity-price-agnostic, and interstate rates escalate on a federal formula tied to the Producer Price Index — set at PPI-FG − 0.55% (the finished-goods producer price index, minus 0.55 percentage points) for 2026–2031, giving built-in, inflation-linked rate growth.[12][13] The investor question is throughput and rate escalation.
• 48699 (all other) layers extra economics on top: the CO₂ incumbents also sell CO₂ as a commodity and run their own enhanced oil recovery (EOR — injecting CO₂ into aging fields to push out more crude), which adds genuine oil-price sensitivity that the refined-products lines lack. And for new CO₂ projects the swing variable is not oil price at all but federal tax policy — specifically the Section 45Q tax credit for captured carbon — and the ability to actually permit and build the route.[5][6]

The metrics investors watch across both — throughput, utilization, contract coverage and tenor, customer concentration, tariff per unit, capex per mile, and (for MLPs) distributable cash flow and coverage — are worked through in the child primers.

6. Demand drivers

Because refined products dominate, group demand is mostly refined-fuel demand. That tracks refinery output and regional supply/demand imbalances: gasoline (the largest volume, ~8.9 million barrels per day in 2025) is mature and in slow secular decline as vehicles get more efficient and electric adoption grows; distillate (diesel and heating oil) tracks freight and industry; and jet fuel is near record levels on strong air travel, a structural offset to falling gasoline. The deeper driver is geography — refining is concentrated on the Gulf Coast while consumption is nationwide, so long-haul pipelines exist to bridge the gap, and refinery closures reshuffle those flows. Renewable diesel and sustainable aviation fuel (SAF) are a growing slice existing lines are adapting to carry.[14][15]

The "other" child runs on a different demand engine: oil-field EOR (which rises and falls with oil prices), the 45Q credit (a 2025 law lifted it to $85 per metric ton for EOR/utilization, materially improving CO₂-throughput economics), industrial carbon capture at ethanol/fertilizer/gas-processing plants, and low-carbon-fuel markets that make Midwest ethanol producers want CO₂ pipelines at all.[6] This is the demand contrast in a sentence: 48691 is driven by how much fuel a mature economy burns; 48699 is driven by tax policy and the pace of decarbonization.

7. Regulation

Regulation is where the two children look most different, and it explains why one is a placid utility and the other a battleground.

• Refined-products pipelines (48691) operate inside a mature, well-defined federal framework. The Federal Energy Regulatory Commission (FERC) sets interstate economics and regulates them as common carriers (they must offer equal, non-discriminatory access). The Pipeline and Hazardous Materials Safety Administration (PHMSA) sets safety rules (49 CFR Part 195, focused on high-consequence areas), the Environmental Protection Agency (EPA) administers spill prevention, the Transportation Security Administration (TSA) governs pipeline cybersecurity (mandatory directives followed the 2021 Colonial ransomware incident), and state public utility commissions handle intrastate lines and siting.[12][13][14]
• All other pipeline transportation (48699) has no single regulator and, critically, no federal siting or eminent-domain framework for CO₂ lines — those are fought state by state (South Dakota banned eminent domain for carbon pipelines in 2025). Underground CO₂ storage runs through EPA Class VI injection-well permits, and the 45Q credit is administered by the IRS. This fragmentation, not engineering or financing, is the single biggest reason CO₂ projects stall.[5][6]

For an investor, the takeaway is that regulatory risk in 48691 is about the periodic re-set of a known rate formula, while in 48699 it is existential — whether a route can be permitted and built at all.

8. Consolidation

The defining trend across the group is consolidation and privatization, and it has run hard in both children.

• In refined products: IFM took Buckeye private (2019); ONEOK bought Magellan (2023, ~$18.8 billion); Sunoco acquired NuStar (2024, ~$7.3 billion); and Brookfield acquired Colonial (2025, ~$9 billion). Two forces drive it — MLP simplification (folding partnerships into corporations) and a wave of private infrastructure capital chasing stable, inflation-linked cash flows.[7][8][9][10]
• In "all other": ExxonMobil's 2023 acquisition of Denbury folded the largest independent CO₂ network into a supermajor, while the growth frontier saw the opposite of expansion — Navigator cancelled its entire 1,300-mile Heartland Greenway in 2023, and Summit Carbon Solutions has been repeatedly forced to shrink its route.[11]

The pattern rhymes: incumbents get bigger through acquisition; new entrants get smaller or disappear. The group's federal CR4 of 51.2% understates the effective concentration on individual corridors, where a single system often has no competition.[3]

9. Risks

The group's risks are a blend, weighted ~97% toward the refined-products child:

• Secular gasoline decline and stranded-asset risk on gasoline-heavy lines (48691) — the dominant long-run concern for the group by revenue.
• Regulatory / rate risk as the FERC index is periodically re-set and litigated (48691).
• Permitting, eminent-domain, and social-license risk — the decisive risk for the "other" child (48699); an economically sound CO₂ project can be killed by state approval or landowner opposition.
• Safety and environmental liability — leaks and spills for fuels; and for CO₂ specifically, its behavior as a dense, odorless asphyxiant.
• Cybersecurity — the 2021 Colonial ransomware shutdown is the cautionary tale for the whole sector.[16]
• Oil-price sensitivity — largely absent in 48691 but real in 48699's EOR-linked incumbents.
• Policy risk — 45Q design and safety rules for 48699; and for the group broadly, interest-rate and leverage sensitivity, since these are debt-heavy, long-duration assets.
• Classification / disclosure risk — both children are opaque buckets buried inside larger companies, so investors rarely see clean segment financials.[13][15]

10. How to invest & outlook

Routes in — refined products (where ~97% of the value is). Public-market investors gain exposure through diversified midstream C-corps and MLPs, where refined-products transport is one segment inside each — so start with segment exposure, not the corporate name. MLPs issue K-1 partnership tax forms (not 1099s) and can generate unrelated business taxable income (UBTI) that is awkward inside retirement accounts; midstream exchange-traded funds (ETFs) and closed-end funds offer a 1099-simple, diversified wrapper. The purest systems (Colonial, Buckeye) are reachable only through institutional infrastructure funds, generally open to institutional and accredited investors — undiluted toll-road cash flows at the cost of liquidity.

Routes in — all other (the ~3% option on decarbonization). Public exposure is a modest segment inside diversified majors (start with the asset, then read filings for the share of revenue, throughput, contracted-versus-uncontracted capacity, customer concentration, and safety liabilities). Dedicated CO₂-pipeline exposure lives in private, infrastructure-fund- and venture-backed carbon-capture developers — illiquid, project-finance-style bets with wide dispersion between winners and cancelled projects. (For reference on how small individual firms here are, the U.S. Small Business Administration's size standard for this industry is $46.0 million in average annual receipts.)[17]

Specific tickers, yields, and valuation multiples belong to individual security analysis and are in the two child primers.

Outlook. Steady rather than exciting, and the two halves point different directions. The refined-products core offers durable, fee-based, inflation-linked cash flows with high barriers to entry, but low volume growth and a product mix slowly shifting from gasoline toward jet fuel, diesel, and renewable fuels — a classic income-and-inflation-protection asset, not a growth story. The "other" bucket is the reverse: tiny today, but the 2025 lift of the 45Q credit and falling CO₂-transport costs improve the economics of expansion, so its future turns almost entirely on non-economic gates — state siting, eminent-domain law, PHMSA safety rules, and community acceptance. Across the group, expect continued consolidation and private-capital acquisition keeping asset valuations firm, a placid income core, and a small, contested growth option on the side. (Forward-looking judgment.)

---

This rollup summarizes NAICS 4869 — Other Pipeline Transportation, an industry group made of two national industries: 486910 (refined-products pipelines, via 48691) and 486990 (all other pipeline transportation, via 48699). Level-wide figures are our ingested federal ground truth; company detail, full economics, and complete sourcing are in the two child primers. The Sources below are drawn from those primers and renumbered to the citations used here.

Sources

1. U.S. Census Bureau. 2022 NAICS Manual — 486910, 486990 and adjacent codes (486110, 486210, 324110, 424710). 2022. https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf
2. U.S. Department of Energy / EIA. Refined Petroleum Product Pipelines (backgrounder). 2023. https://www.energy.gov/sites/default/files/2023-08/Pipeline%20Backgrounder_FINAL_508.pdf
3. U.S. Census Bureau. 2022 Economic Census — Concentration of Largest Firms, NAICS 4869 (receipts, firms, CR4/CR8/CR20/CR50, HHI). 2025. https://data.census.gov/table/ECNSIZE2022
4. U.S. Census Bureau. County Business Patterns 2023 — NAICS 4869 (establishments, employment, payroll). 2023. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
5. Congressional Research Service. Carbon Dioxide (CO₂) Pipelines: Safety, Siting, and Eminent Domain (IN12575). 2025. https://www.congress.gov/crs-product/IN12575
6. PHMSA (U.S. DOT). Annual Report Mileage for Hazardous Liquid or Carbon Dioxide Systems (~5,354 miles CO₂/other, 2022). https://www.phmsa.dot.gov/data-and-statistics/pipeline/annual-report-mileage-hazardous-liquid-or-carbon-dioxide-systems
7. ONEOK. ONEOK to Acquire Magellan Midstream Partners (~$18.8B), SEC Form 425. 2023. https://www.sec.gov/Archives/edgar/data/1126975/000121390023052276/ea181057-425_oneok.htm
8. Sunoco LP. Sunoco LP Completes Acquisition of NuStar Energy L.P. (~$7.3B). 2024. https://www.prnewswire.com/news-releases/sunoco-lp-completes-acquisition-of-nustar-energy-lp-announces-a-4-increase-in-quarterly-distribution-302135594.html
9. Transport Topics. Brookfield to Buy Colonial Pipeline Owner in $9 Billion Deal. 2025. https://www.ttnews.com/articles/brookfield-buy-colonial
10. Buckeye Partners. Who We Are (IFM Global Infrastructure Fund ownership). 2026. https://www.buckeye.com/who-we-are
11. Oil & Gas Journal / ExxonMobil. ExxonMobil acquires Denbury (closed Nov. 2023, ~$4.9B; largest U.S. CO₂ network). 2023. https://www.ogj.com/general-interest/companies/article/14296369/exxonmobil-acquires-denbury
12. Federal Energy Regulatory Commission. Oil (interstate rate regulation; common carriers). 2025. https://www.ferc.gov/oil
13. Akin Gump. FERC Finalizes New Oil Pipeline Index for 2026–2031 (PPI-FG − 0.55%). 2026. https://www.akingump.com/en/insights/alerts/ferc-finalizes-new-oil-pipeline-index-for-2026-2031-key-takeaways
14. Pipeline and Hazardous Materials Safety Administration. Hazardous Liquid Integrity Management (49 CFR Part 195). 2025. https://www.phmsa.dot.gov/pipeline/liquified-natural-gas/hazardous-liquid-integrity-management
15. U.S. Energy Information Administration. Short-Term Energy Outlook and Increasing fuel efficiency leads to decreasing gasoline consumption (~8.9 MMbbl/d in 2025). 2026. https://www.eia.gov/todayinenergy/detail.php?id=67426
16. Wikipedia. Colonial Pipeline ransomware attack. 2021. https://en.wikipedia.org/wiki/Colonial_Pipeline_ransomware_attack
17. U.S. Small Business Administration. Table of Small Business Size Standards (NAICS 486990 = $46.0M). 2023. https://www.sba.gov/document/support-table-size-standards