Other Transit and Ground Passenger Transportation (NAICS 48599): An Investor's Primer

1. Overview

This is the U.S. government's catch-all bin for local passenger transport that doesn't fit the tidier categories — not city buses, not taxis, not intercity coaches, not school buses. Its formal label under the North American Industry Classification System (NAICS) is code 48599, and it holds two very different businesses:

• Special needs transportation (NAICS 485991) — moving the elderly, disabled, and medically fragile, above all to medical care. In the trade this is paratransit and non-emergency medical transportation (NEMT): the wheelchair van, the dialysis ride, the accessible sedan.[1][4]
• All other transit and ground passenger transportation (NAICS 485999) — mostly airport and hotel shuttles and employer vanpools: fixed-route, fixed-schedule shared rides that aren't on-demand ride-hailing.[1][5]

They share a workforce (drivers), a cost stack (labor, fuel, insurance, vehicles), and a business model (win a contract, run vehicles efficiently). But they answer to different customers and different tailwinds. Special needs transportation runs on government health programs and a legal mandate; shuttles and vanpools run on air travel, commuting, and employer/agency budgets. One is defensive and demographically driven; the other is more cyclical and more exposed to how much people fly and commute.

For investors the shared punchline is blunt: there is no clean U.S.-listed pure-play in either child, and none at this level. Public exposure is indirect and diluted; the real operating and brokerage business is a private-markets, private-equity, and small-business arena. What this rollup adds over the two leaf primers is the contrast between the children — who is bigger, which way each is growing, who owns them, and how you would actually get exposure to each.

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

Special needs transportation is roughly 70% of this level by revenue and jobs; the shuttle/vanpool bucket is the smaller ~30%. But the smaller child has a higher share of establishments (37% vs. 63%), meaning its typical location is smaller — about 11 employees per establishment versus 17 for special needs.[2][4][5] The contrast that matters:

One overlap to hold onto. The large multinational contract operators — Transdev, Keolis, RATP Dev, MV Transportation, and Mobico's WeDriveU — straddle both children, running paratransit and shuttle/microtransit under the same multi-modal agency contracts.[19][17] That is visible even in the raw counts: the two children's firm totals (3,462 + 1,618 = 5,080) slightly exceed the 5,065 firms reported at this level, exactly what you'd expect when a handful of operators are counted in each child but once at the parent.[3] So "who owns them" differs at the specialist end (NEMT brokers vs. vanpool/airport-shuttle firms) but converges at the scaled contract-operator top.

3. How big it is

Ground-truth federal figures for NAICS 48599 as a whole (employer statistics and receipts come from different federal series and years — don't read the row set as one income statement):

Split between the children: special needs transportation contributes ~$5.81B of receipts, ~66,000 jobs, and ~$2.51B of payroll; the shuttle/vanpool bucket the remaining ~$2.40B, ~25,000 jobs, and ~$1.03B of payroll.[4][5] The two reconcile to the level almost exactly on establishments and employment.

Extremely fragmented — even more so combined than apart. At this level the four largest firms took just 14.2% of receipts, the top eight 19.9%, the top twenty 30%, and the top fifty only 39.4%.[3] The Herfindahl-Hirschman Index (HHI, the standard single-number concentration score where ~1,500 is the "moderately concentrated" line) is 103.1 — barely above zero.[3] Pooling two fragmented industries dilutes concentration further: the level HHI (103.1) sits below the shuttle child's own 143.[3][5] In plain terms, no company holds meaningful national share of this level. (The important exception is invisible in these numbers: the NEMT broker layer inside 485991 is highly concentrated, but brokers who own no vans are largely classified in other codes — see below.)

Undercount caveat — the ~$8.2 billion understates the real footprint, and understates it differently for each child. County Business Patterns primarily covers employer establishments; the Economic Census generally excludes government-owned operations.[7] Three leaks matter here:

• Government-run service is excluded. Large volumes of Americans with Disabilities Act (ADA) complementary paratransit are run in-house by public transit agencies, and many vanpool/microtransit programs are agency-operated — none of it in these business statistics.[7]
• Brokered and managed-care dollars land elsewhere. Spend flowing through ModivCare/MTM contracts and Medicaid managed-care plans is largely coded outside 485991, which is why the broker concentration doesn't appear above.[10][12]
• Tiny and in-house operators fall through. Single-van owner-operators (no payroll employees) are missing, and hotel/airport/campus shuttles run in-house are coded to those industries, not here.[7]

For scale on the broader activity the two leaf primers cite private market-research estimates of roughly $11–17 billion for total U.S. NEMT and roughly $5 billion for U.S. airport shuttles alone — each a broader definition than the census code, not an apples-to-apples restatement.[11]

4. Investable universe — where value concentrates across the children

There is no ticker for "NAICS 48599." Value concentrates in a few places, and they differ by child:

The scaled private assets are the NEMT brokers (in 485991). The single most valuable pure operating exposures at this level are the two national non-emergency medical transportation brokers: ModivCare (formerly Nasdaq: MODV; ~$2.79B service revenue in 2024, ~36.8M trips) and privately held MTM, which reached all 50 states after buying Access2Care.[12][13] Both are private today — ModivCare went through Chapter 11 in 2025 and emerged lender-owned on Dec 29, 2025 — so neither is buyable as common stock.[12]

The scaled listed names straddle or sit adjacent to both children:

Private operators — where the bulk of the level lives:

• Large multi-modal contract operators (both children): Transdev U.S., Keolis North America, RATP Dev USA, MV Transportation — mostly foreign- or state-owned, running paratransit and shuttle/microtransit under agency contracts.[19]
• Vanpool and roll-up specialists (485999): Enterprise Mobility (largest U.S. vanpool operator after buying vRide); Beacon Mobility, an Audax-backed PE roll-up of Northeast bus/vanpool/paratransit firms.[20][21]
• Autonomous-shuttle venture bets (485999): Beep, May Mobility, EasyMile — driverless microtransit pilots, years from proven unit economics.[27]
• Thousands of small operators (both children): the sub-$19M van and shuttle firms that make up most of the 6,205 establishments.[2][6]

Bottom line: the cleanest listed operating exposure at this level is Mobico (diversified and distressed) or Via (a software/operations bet); the cleanest growth-theme exposure is Uber/Lyft's health arms (a rounding error in each). Everything with real scale and real margins — the NEMT brokers and the contract operators — is private.

5. How the money works

Neither child earns open-market fares at scale; both are contracted-capacity services, and none of the specialized frameworks (utility rate base, real-estate FFO, mining cost curves) apply. Judge each layer on its own metrics.

Operators (both children). Paid per completed trip (base rate + per-mile), per vehicle-hour, or a fixed monthly fee. Profit turns on vehicle utilization (paid trips per van-day) versus deadhead miles (empty repositioning that earns nothing), plus driver wages, insurance, and fuel — the three costs that move margins. Commercial auto insurance for accessible vans is the number-one killer of small NEMT operators; load factor is the key lever for retail airport vans.[4][5] Margins are thin across the board (~11–17 employees and ~$1.5M revenue per firm), with little pricing power in a fragmented market.[2][3]

The distinctive layer — NEMT brokers (485991 only). Brokers such as ModivCare and MTM sign statewide or plan-wide contracts paid a capitated fee (a fixed dollar amount per member per month, whether or not the member rides) and profit if they arrange the required trips for less. Efficient at scale — but it breaks when driver pay, fuel, and insurance rise faster than a fixed fee, which is precisely what pushed ModivCare through bankruptcy.[12] There is no equivalent broker economics in 485999; the shuttle/vanpool child is operators and contracts all the way down.

The subsidy layer — vanpools (485999 only). Employer-sponsored commuter vans lean on the federal qualified transportation pre-tax benefit under Internal Revenue Code Section 132(f) — up to $340/month in 2026 — which is the economic backbone of the vanpool segment. Marginal cost per extra rider is near zero, so profit is about keeping vans full.[24]

Why the payer keeps funding it (485991). Medicaid treats NEMT as cheap prevention — industry and CMS-adjacent sources estimate on the order of $11 of downstream health savings per $1 spent by preventing missed dialysis and avoidable ER visits. That return-on-investment argument is the industry's political shield.[10]

6. Demand drivers

Special needs (485991) — structural and defensive:

• Aging and disability. ~55.9M Americans are 65+, ~43.9% of them report a disability, and an estimated 7.7M have travel-limiting disabilities — a near-mechanical volume tailwind.[26]
• Medicaid caseload and the legal mandate. Federal law requires states to assure transportation to care, putting a non-discretionary floor under demand.[8][9]
• Medicare Advantage supplemental transport. A newer, commercially priced demand pool since ~2020 that pulled in Uber and Lyft.[14]

Shuttle/vanpool (485999) — commercial and cyclical:

• Air travel and hospitality volumes (airport/hotel shuttles) and return-to-office commuting (vanpools/employee shuttles) — the main swing factors, both hit hard in 2020.[5]
• Ride-hailing competition is a persistent headwind for retail shared vans specifically.[22]
• Fuel/parking prices, congestion and sustainability mandates, and fleet electrification nudge employers and agencies toward shared modes.

Shared across both: the secular outsourcing of transport by agencies, airports, hospitals, and universities that would rather contract than own vehicles and hire drivers — the single most durable demand driver for the scaled operators that span both children.[5][19]

7. Regulation

The two children answer to largely different regulators, which is why one is defensive and the other commercial:

Special needs (485991) — health-program driven. Federal rule 42 CFR § 431.53 and § 440.170 require state Medicaid plans to ensure transportation to care; the Consolidated Appropriations Act, 2021 (Section 209) codified NEMT as a statutory Medicaid benefit and added provider-integrity standards.[8][9] States deliver via brokers, managed-care organizations, or fee-for-service — the broker/MCO model now dominates, which is why two brokers control so much volume.[10] ADA complementary paratransit (49 CFR Part 37) obliges every fixed-route transit agency to offer comparable service, reaching the contractors who run it.[7]

Shuttle/vanpool (485999) — carrier and tax driven. The Federal Motor Carrier Safety Administration (FMCSA) regulates for-hire passenger carriers by vehicle capacity (9–15 / 16+ passengers) and weight (10,001 lb), with a lighter touch for airport-incidental service within ~25 miles.[23] The Section 132(f) commuter benefit is the vanpool subsidy engine.[24] ADA accessibility, commercial driver's license (CDL) requirements, drug/alcohol testing, and airport access agreements apply across the board.

The common thread: regulation is a demand floor for 485991 (the mandate) and mostly a compliance cost and barrier to entry for 485999. A state rate change or a re-bid can reshape a provider's economics overnight in either child.

8. Consolidation

The through-line at this level is consolidation at the top over a stubbornly fragmented base — with the action concentrated differently in each child:

• NEMT broker roll-up (485991). ModivCare (~25% estimated broker share) and MTM are forming a duopoly; MTM bought Access2Care (Oct 2024) to reach all 50 states after earlier absorbing Veyo.[13] ModivCare's prepackaged Chapter 11 (Aug 2025), cutting >$1.1B of debt and emerging private, is the vivid warning of the capitated model under cost stress.[12]
• Contract-operator roll-up (both children). Transdev acquired First Transit (2023); EQT Infrastructure bought First Student/First Transit (2021); Mobico sold its U.S. school-bus arm (2025) while keeping WeDriveU's shuttle/paratransit work.[19][17] These operators consolidate across both children at once.
• Vanpool/PE roll-up (485999). Audax-backed Beacon Mobility is buying Northeast bus/vanpool/paratransit operators; Enterprise consolidated vanpooling by buying vRide.[20][21]
• Rideshare and autonomy at the edges. Uber Health and Lyft Healthcare are pulling the walk-capable NEMT segment (485991), while autonomous-shuttle startups pilot in 485999.[14][22][27]

Reported national concentration stays low (HHI 103.1) because the fragmented base swamps the deal activity, and because the biggest consolidator — the NEMT broker layer — is largely coded outside this NAICS.[3] Scale still matters: larger operators spread dispatch, compliance, training, maintenance, and insurance buying across contracts, while local relationships and agency know-how remain real barriers.

9. Risks

• Reimbursement / cost-inflation lag (mainly 485991). Government rates rise slowly while wages, fuel, and insurance rise fast — the structural risk that bankrupted the market leader.[12]
• Demand cyclicality (mainly 485999). Revenue tied to air travel, tourism, and commuting drops in recessions and travel shocks; vanpool/employee-shuttle demand hinges on unsettled return-to-office norms.[5]
• Contract and single-customer concentration (both). National concentration looks low, but an individual operator's book can hinge on one broker, agency, or airport contract that can be re-bid or re-priced.[3]
• Insurance, labor, and safety (both). Expensive/scarce commercial auto insurance, chronic CDL-driver shortages, and accident/claims exposure sit in a labor-dominated cost stack.[4][5]
• Substitution and technology (both). Ride-hailing already gutted retail shared vans and is taking the ambulatory NEMT segment; robotaxis and autonomous shuttles are a longer-run wildcard.[22][27]
• Policy risk (mainly 485991). Any federal move to cut Medicaid, tighten eligibility, or weaken the NEMT mandate would hit volumes directly.[10]
• Data and disclosure gaps (both). Private operators disclose little, and federal statistics under-cover government-run and nonemployer activity — do not read the low HHI as evidence of an untapped profit pool; fragmentation more likely reflects weak pricing power.[7]

10. How to invest and the outlook

Public-market routes (indirect only). There is no pure-play stock at this level or in either child. The cleanest listed options are Via (VIA) for the transit software/operations layer, Mobico (MCG) for a diversified, distressed operator that touches both children via WeDriveU, and ABM for embedded airport-shuttle exposure.[16][17][18] For the NEMT growth theme, Uber/Lyft health arms and Medicaid managed-care insurers give indirect read-through — each a bet on a much larger business.[14][15] For any name, the diligence is segment disclosure, contract duration, customer concentration, labor and insurance cost, fleet capital spending, and cash generation.

Private-market routes (where the real exposure is). This is a small-business and lower-middle-market private-equity / private-credit arena. The scaled assets are the NEMT brokers (ModivCare, MTM — accessed via private credit/equity, not shares) and the multi-modal contract operators; the roll-up thesis (buying fragmented operators for route density and insurance-buying power) is the main institutional angle in both children, with autonomous/microtransit ventures as the high-risk edge.[12][13][20][21][27] Diligence is contract-level: renewal and escalation clauses, fuel and labor treatment, route density, payer mix, claims history, fleet age, and free cash flow after replacement capital expenditure.

Outlook. The two children point in different directions and should be underwritten separately. Special needs transportation — ~70% of the level — has a demographic and legal tailwind and defensive volumes; its open question is not demand but whether reimbursement rises fast enough to let operators and brokers make money. Shuttle/vanpool is bifurcating: retail shared vans are structurally impaired, while contracted corporate, university, and agency shuttle/microtransit work is the growth pocket, gated by return-to-office durability and air-travel volumes. The base case for the level as a whole is steady, policy-and-outsourcing-supported volume growth with thin, uneven margins — a low-margin, fragmented, mostly private services industry with a narrow and imperfect set of public proxies, not a growth sector with an obvious ticker to buy. The supplied federal data do not support a precise market-growth forecast.

---

Sources

1. U.S. Census Bureau, 2022 NAICS — 48599 Other Transit and Ground Passenger Transportation, and children 485991 / 485999 (definitions and exclusions), 2022. https://www.census.gov/naics/?input=485990&year=2022
2. U.S. Census Bureau, County Business Patterns: 2023, NAICS 48599 and children (establishments, employment, annual and first-quarter payroll), 2025. 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 48599 and children (receipts, firm count, CR4/CR8/CR20/CR50, HHI), 2025. https://data.census.gov/table/ECNSIZE2022
4. Histometrics, Special Needs Transportation (NAICS 485991): An Investor's Primer (child primer synthesizing CBP 2023, EC 2022, and industry sources), 2026.
5. Histometrics, All Other Transit and Ground Passenger Transportation (NAICS 485999): An Investor's Primer (child primer synthesizing CBP 2023, EC 2022, and industry sources), 2026.
6. U.S. Small Business Administration, Table of Small Business Size Standards (NAICS 485991 / 485999 = $19 million), 2023. https://www.sba.gov/document/support-table-size-standards
7. U.S. Census Bureau / U.S. DOT, CBP and Nonemployer Statistics coverage; Economic Census government-establishment exclusion; ADA complementary paratransit (49 CFR Part 37), 2013–2026. https://www.census.gov/programs-surveys/cbp/about.html; https://www.ecfr.gov/current/title-49/subtitle-A/part-37
8. Medicaid.gov (CMS), Assurance of Transportation — 42 CFR § 431.53 and § 440.170, 2024–2026. https://www.medicaid.gov/medicaid/benefits/assurance-of-transportation
9. MACPAC / CMS, Consolidated Appropriations Act, 2021, Section 209 — NEMT as a statutory Medicaid benefit, 2021–2023. https://www.macpac.gov/wp-content/uploads/2021/06/Chapter-5-Mandated-Report-on-Non-Emergency-Medical-Transportation.pdf
10. KFF / CMS Report to Congress, Medicaid NEMT ~$3B/yr (<1% of Medicaid), 3–4M beneficiaries; downstream-savings ROI; broker/MCO delivery, 2018–2024. https://www.kff.org/medicaid/issue-brief/medicaid-non-emergency-medical-transportation-overview-and-key-issues/
11. Mordor Intelligence / Global Growth Insights / Research and Markets, U.S. NEMT market (~$11–17B, 2025) and U.S. airport-shuttle market (~$5B, mid-2020s) — broader definitions than the census codes, 2024–2025. https://www.mordorintelligence.com/industry-reports/non-emergency-medical-transportation-market
12. ModivCare Inc. / Businesswire / SEC filings, 2024 service revenue ~$2.79B, ~36.8M trips; prepackaged Chapter 11 (Aug 2025); emerged private Dec 29, 2025 cutting >$1.1B (>85%) of debt, 2025. https://www.businesswire.com/news/home/20251229414980/en/
13. MTM Inc. / press release, MTM acquires Access2Care, expanding to all 50 states (Oct 2024); trip and member scale, 2024. https://www.mtm-inc.net/mtm-to-expand-reach-with-acquisition-of-access2cares-nemt-business/
14. Uber Health / Lyft Healthcare / Healthcare Dive, Uber Health in 250+ cities; Lyft Healthcare a Medicaid provider in ~21 states; Medicare Advantage supplemental transport; Medicaid managed-care coordination, 2024–2025. https://www.uberhealth.com/us/en/transportation/; https://www.lyft.com/healthcare
15. Uber Technologies Inc. and Lyft Inc., Full-Year 2024 results and segment disclosures (Uber revenue ~$44B; Lyft ~$5.8B), 2025. https://investor.uber.com/news-events/; https://investor.lyft.com/
16. Renaissance Capital / Reuters, Via Transportation prices IPO at $46 (Sept 2025), ~$4.2B market value; >90% of revenue from government agencies, 2025. https://www.renaissancecapital.com/IPO-Center/News/113433
17. Mobico Group PLC, Annual Report 2024 / 2025 trading updates (WeDriveU transit, shuttle, and paratransit); completion of U.S. school-bus sale to I Squared Capital (2025), 2025. https://www.mobicogroup.com/media/f1djgmn2/mobico-group-plc-annual-report-2024.pdf
18. ABM Industries, Shuttle Services, 2026. https://www.abm.com/solutions/service-line/shuttle
19. Transdev / Keolis / RATP Dev / MV Transportation, Governance and North American operations (paratransit + shuttle/microtransit); Transdev acquisition of First Transit (2023), 2023–2026. https://www.transdev.com/en/group/governance; https://www.keolis.com/en/group/governance; https://www.ratpdev.com/en; https://mvtransit.com/
20. PR Newswire, Enterprise Holdings acquires vRide vanpooling business (2015), 2015. https://www.prnewswire.com/news-releases/enterprise-holdings-acquires-vride-vanpooling-business-300285380.html
21. Federal Register / Surface Transportation Board, Van Pool Transportation LLC / Beacon Mobility (Audax-backed) — acquisitions of control, 2024–2025. https://www.federalregister.gov/documents/2024/09/27/2024-22185/van-pool-transportation-llc-acquisition-of-control-transaction-corporate-shuttles-inc
22. CNN Business, SuperShuttle airport business shutting down at the end of 2019 (retail shared-van decline), 2019. https://www.cnn.com/2019/12/13/business/supershuttle-shutting-down/index.html
23. Federal Motor Carrier Safety Administration, Understanding Passenger Carrier Regulations — 9–15 / 16+ passenger and 10,001-lb thresholds; airport-incidental (~25-mile) exemption, 2026. https://www.fmcsa.dot.gov/regulations/understanding-passenger-carrier-regulations
24. Internal Revenue Code § 132(f), Qualified transportation fringe benefit — up to $340/month in 2026; vanpool 7+ seat rule, 2026. https://en.wikipedia.org/wiki/Employer_transportation_benefits_in_the_United_States
25. U.S. DOT / eCFR — 49 CFR Part 37 & U.S. GAO, ADA complementary paratransit — service standards, contractor obligations, demand and per-trip cost, 2013–2026. https://www.gao.gov/assets/gao-13-17.pdf
26. Centers for Disease Control and Prevention / U.S. Census Bureau / Bureau of Transportation Statistics, ~55.9M Americans 65+; 43.9% of adults 65+ with a disability; 7.7M with travel-limiting disabilities, 2022–2024. https://www.cdc.gov/media/releases/2024/s0716-Adult-disability.html
27. Beep, Inc. / May Mobility / TechCrunch, Autonomous shuttles and driverless microtransit pilots, 2023–2025. https://ridebeep.com/; https://techcrunch.com/2023/12/18/may-mobilitys-driverless-microtransit-might-beat-robotaxis-to-profitability/