Travel Arrangement and Reservation Services (U.S.) — NAICS 5615

A Histometrics rollup primer for public- and private-market investors. Synthesized from the three child-industry primers (56151 Travel Agencies, 56152 Tour Operators, 56159 Other Travel Arrangement and Reservation Services) plus our ground-truth federal statistics for this level. Figures are the most recent available; forward-looking statements are framed as judgments, not facts.

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1. Overview

The North American Industry Classification System (NAICS) — the U.S. government's standard for grouping businesses by what they do — uses code 5615, Travel Arrangement and Reservation Services, as the four-digit "industry group" that holds every business that helps arrange travel without owning the planes, ships, hotels, or arenas involved. It is the middleman layer of the travel economy: agents, packagers, reservation systems, ticketing platforms, membership clubs, and the civic offices that market destinations.

The unifying trait across the whole group is asset-light intermediation. These firms don't carry the risk of an empty seat or an unsold room; they earn a commission, a spread, a subscription due, or a per-transaction fee for standing between a traveler and a supplier. That makes the economics capital-light and often cash-generative — but it also leaves the group exposed to the two permanent hazards of any middleman: disintermediation (being cut out as suppliers sell direct and travelers self-serve) and cyclicality (travel is among the first things households and companies cut in a downturn).[56151][56152][56159]

The real story of 5615, though, is not the group — it's the contrast among its three children, which earn money in genuinely different ways, are owned by completely different kinds of people, and face different threats. This primer leads with that comparison and then treats the group as a whole.

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

NAICS builds codes by adding digits: broad sectors (2-digit) narrow to industry groups (4-digit, this level), then to NAICS industries (5-digit), then to the most detailed national industries (6-digit). Industry group 5615 splits into three five-digit children:

• 56151 — Travel Agencies: agents that sell other companies' trips for a commission or fee and hold no inventory. Ranges from local leisure agencies and home-based advisors to the two giant online travel agencies (OTAs) and the global corporate travel-management companies (TMCs).[56151]
• 56152 — Tour Operators: wholesalers that buy rooms, seats, guides, and activities in bulk, bundle them into a packaged trip, and resell it under their own brand and price — escorted coach tours, safaris, expedition cruises, student trips. They take inventory risk and earn a spread.[56152]
• 56159 — Other Travel Arrangement and Reservation Services: a holding pen for everything that is neither a retail agency nor a tour operator. It is itself really two businesses — non-profit/government Convention and Visitors Bureaus (CVBs) that market cities, and a commercial grab-bag of reservation systems, event ticketing, auto clubs, and timeshare-exchange networks that monetize the booking or membership itself.[56159]

Contrast table — the three children side by side

(HHI = Herfindahl-Hirschman Index, a 0–10,000 concentration score where below 1,500 is "unconcentrated"; CR4 = the combined revenue share of the four largest firms; GDS = global distribution system, the reservation "plumbing" airlines and hotels sell through; PE = private equity.)

The quantitative shape of each child

Read the two tables together and three contrasts jump out.

1. Travel agencies are the establishment story; "other reservation" is the revenue story. Agencies are ~59% of the storefronts but ~47% of the receipts — many small locations. The "other reservation" bucket is the reverse: ~24% of establishments but ~40% of receipts, because it contains a smaller number of far larger machines (a GDS, a ticketing platform, an auto-club federation). Revenue per firm — ~$11.0M in 56159 versus ~$3.6–4.3M in the other two — is the fingerprint of that difference.[3]
2. Pay tracks the technology intensity. The reservation-and-ticketing child pays ~$125K per employee (a skilled software/reservation workforce); tour operators, the most people-and-logistics business, pay ~$61K. That gap is a clue to where the scalable, high-margin economics actually sit.[2][3]
3. "Concentration" means nothing at this level and everything inside the niches. The group is a mix of a highly concentrated child (agencies, CR4 61.7%), a genuinely fragmented one (tour operators, HHI 193), and one that averages to "fragmented" (HHI 362) while hiding a reservation oligopoly, a ticketing near-monopoly, and a timeshare duopoly. Section 3 returns to why the group HHI is an accounting artifact.

Boundary note. This group deliberately excludes the businesses that actually provide the travel — airlines, cruise lines, hotels, and the sightseeing bus/boat operators (NAICS subsector 487) are all classified where they operate, not here. 5615 is strictly the arrangement-and-reservation layer.[56152]

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

Our ingested ground-truth federal statistics for NAICS 5615 as a whole:

The level number is a real sum, not an estimate. Establishments (9,308 + 2,584 + 3,812 = 15,704) and employment (82,899 + 27,113 + 76,800 = 186,812) add up to the group totals exactly; receipts and payroll reconcile to within rounding.[1][2][3] The one line that does not add up is the firm count — the three children sum to 12,576, but the level reports 12,519, because a company that operates in more than one of these industries is counted once at the group level and separately in each child. That is normal and small (~0.5%).

But three cautions apply before anyone leans on the $69 billion.

Caveat 1 — the group HHI is a misleading average of markets that don't compete. At 396.4, the group HHI reads "unconcentrated." It is not one market. A leisure travel advisor does not compete with a concert-ticketing platform; a safari operator does not compete with a global distribution system; and none of them compete with a city tourism office. Inside the real niches, concentration is far higher — online leisure distribution is a two-firm affair, reservation distribution is a three-firm global oligopoly, timeshare exchange is effectively a duopoly, and primary event ticketing is dominated by one company to the point of a 2026 antitrust liability verdict.[1][3] Note too that the group CR4 (34.2%) is lower than travel agencies' own CR4 (61.7%): re-ranking the biggest firms against a larger $69B revenue base dilutes their measured share. Treat the group concentration figures as accounting artifacts, not competitive facts.

Caveat 2 — the undercount is large, and it runs in different directions for each child. The $69B captures the standalone, employer firms the census can see. It systematically understates the true economic weight of travel arrangement because:

• Agencies book the take, not the trip. A pure agent's receipts are its commission, not the ticket value — so 56151's $32B is the industry's cut, not the travel it moves. For scale on the air channel alone, the Airlines Reporting Corporation (ARC) settled $99.2 billion of U.S. travel-agency air-ticket sales in 2024 (ticket value, not additive to Census receipts).[56151]
• Small and individual ownership dominates the long tail and is excluded. County Business Patterns counts only employer establishments, so the many home-based independent advisors, one-person adventure outfits, sole-proprietor ticket brokers, and reservation offices with no payroll are not counted. Where small/individual ownership dominates — most visibly in agencies and the "other reservation" grab-bag — the true firm count runs well above the employer figures. Our ground-truth file for this level publishes no non-employer counts or receipts, so none are stated here.[4][56151][56159]
• The biggest branded revenue is booked elsewhere. Much of the largest guided-travel revenue is classified as water transport or airlines; the biggest online booking activity sits partly in adjacent codes; and marquee operators report their revenue inside larger parents — Ticketmaster inside Live Nation, RCI inside Travel + Leisure, Interval International inside Marriott Vacations. Member-basis measures dwarf the census line (the United States Tour Operators Association, USTOA, reported ~$24.4B of member revenue in 2024 alone).[56152][56159]
• Government-run destination offices are excluded. The business census omits government establishments, and many of the country's largest destination organizations are exactly that — the Las Vegas authority alone runs a budget near $460 million, roughly two-thirds of one percent of the entire group, yet sits outside these figures.[56159]

Bottom line: read $69 billion as a clean but narrow measure of the standalone, private/non-profit, employer firms the census can see — the "measured core" — not as the full economic weight of the travel-arrangement layer.

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

The single most important fact carries straight up from all three children: there is no listed pure-play for NAICS 5615, or for any of its children. Public exposure is a scattered set of segments and global names; large parts of the group are owned only privately or not at all. All company figures below are global/consolidated scale indicators — do not add them to the federal receipts number. Tickers are reserved to this section and Section 10.

Where the liquid public value sits (mostly in 56151 and 56159):

• Travel distribution — the OTAs (56151). The two large-cap platforms, Booking Holdings (BKNG) and Expedia Group (EXPE), are the liquid, scaled way to own travel distribution; Trip.com (TCOM) and MakeMyTrip (MMYT) add Asia/India growth; Tripadvisor (TRIP) adds experiences/discovery.[56151]
• Ticketing (56159). Live Nation Entertainment (LYV) owns Ticketmaster (segment ~$3.0B revenue, ~$1.1B operating income, 2024); the resale pure-plays StubHub (STUB) (IPO Sept 2025) and Vivid Seats (SEAT) give direct secondary-market take-rate exposure.[56159]
• Reservation-distribution infrastructure (the "picks and shovels," 56159 / feeding 56151). Sabre (SABR) is the leveraged U.S.-listed GDS bet (~$3.0B revenue, 2024); Amadeus (AMS, Madrid) is the higher-quality non-U.S. peer.[56151][56159]
• Guided/packaged travel (56152) and timeshare-exchange sleeves (56159). One small U.S. expedition operator, Lindblad Expeditions (LIND) (~$645M FY2024); foreign-listed integrated tourism groups TUI (TUI1.DE), Jet2 (JET2.L), Flight Centre (FLT.AX); the Viator marketplace inside Tripadvisor (TRIP); and the RCI / Interval International exchange sleeves inside vacation-ownership developers Travel + Leisure (TNL) and Marriott Vacations Worldwide (VAC) — though in those two you are mostly buying a timeshare developer.[56152][56159]

Where the value is private or non-buyable:

• Corporate travel (56151). The one listed corporate-travel pure-play, Global Business Travel Group / Amex GBT (GBTG), is being taken private in 2026 — a merger-arbitrage situation, not a long-term public holding. The rest is private: Internova (PE-owned), BCD Travel (family-owned), CWT (absorbed into Amex GBT).[56151]
• Escorted/packaged tours (56152). Overwhelmingly private — Apollo owns The Travel Corporation, KKR owns Travelopia, and Globus, Collette, Tauck, G Adventures, Gate 1, and EF remain private/family-owned. Reachable mainly through private equity and private credit.[56152]
• The commercial reservation grab-bag (56159). AAA (~60M-member non-profit federation, no equity), Travelport (#3 GDS, PE-owned via Siris), travel-fintech Hopper, and thousands of sub-threshold ticket brokers.[56159]
• The civic tenth (56159 / CVBs). No CVB stock exists and a bureau is essentially never an acquisition target. Exposure comes only indirectly — municipal hotel-/room-tax and convention-center revenue bonds (the most literal claim on the tax cash flow), adjacent equities (events EEX; convention hotels RHP, HST; hotel brands MAR / HLT / H; Las Vegas resorts MGM / CZR), and private equity in the destination-marketing software and venue stack (Granicus, Cvent via Blackstone, Legends/ASM Global).[56159]

The synthesis for a stock-picker: an investor who says "I want NAICS 5615" is really assembling exposure across three unrelated theses — travel distribution (BKNG, EXPE, SABR), guided/packaged travel (LIND, TUI, TRIP/Viator), and reservation/ticketing/membership (LYV, STUB, SEAT, TNL, VAC) — plus a civic tenth (56159's CVBs) that can only be reached through bonds and adjacencies. Notice how few names span slices (Sabre and Tripadvisor recur), which underlines that this is a group of separate businesses, not one industry.

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5. How the money works

Across the three children, four distinct engines run — and knowing which one you're looking at tells you the cyclicality and the risk.

A. The commission / take-rate engine (travel agencies, plus ticketing and reservation platforms in 56159). The firm sits between buyer and seller and keeps a slice. Agencies earn supplier commissions (~10% hotels, ~10–16% cruises/tours; air is now barely commissionable after U.S. carriers eliminated base commissions ~2002), service fees, override commissions from pooling volume, and GDS incentives.[56151] Ticketing and GDS platforms earn a take rate on gross merchandise or booking value (a resale marketplace's ~10–20% take on billions of volume, or a GDS's fee per air segment).[56159] The metric that matters is the take rate — revenue as a percentage of the gross value of travel booked (roughly 12–14% for the big OTAs, low-single-digits for corporate TMCs). All of these are near-zero-inventory, low-capital, high-operating-leverage businesses whose margins live on volume, mix, and marketing cost.[56151][56159]

B. The spread-on-a-package engine, funded by float (tour operators). An operator contracts inventory at wholesale "net" rates (typically 15–40% below retail), prices the package at its own markup (gross margins ~25–35% on escorted tours, 50%+ on luxury), and collects customer deposits (commonly 30–50%) months before paying suppliers — real float, but money owed back, which is why bonding exists. Profit turns on departure fill rate and the forward-booking curve, the single most-watched leading indicator.[56152]

C. The recurring-membership / subscription engine (auto clubs, timeshare exchange, in 56159). Members pay annual dues up front. The metrics are member count and renewal rate; a base of millions at high-80s-to-90%+ renewal produces extraordinarily predictable, low-marginal-cost revenue plus a mild float benefit. This is the recession-resistant end of the group.[56159]

D. The tax-funded civic flywheel (CVBs, in 56159). Bureaus earn no profit. A visitor pays a hotel occupancy tax → a statutory slice funds the CVB → the CVB markets the destination and books conventions → more overnight visitors → more room-tax revenue. A bureau's budget is effectively a leveraged bet on local lodging demand, increasingly funded by self-imposed Tourism Improvement District (TID) assessments rather than politically exposed appropriations.[56159]

The common thread across A–C is asset-light operating leverage: once the network, platform, or club exists, each additional transaction or member costs little to serve, so incremental margins are high, and the main variable cost is customer acquisition — these businesses live on lifetime value versus acquisition cost, and on retention. Our federal file reports no industry-wide margin, take-rate, average-booking-value, room-night, cancellation, or per-firm figures for this level; those metrics do not exist in the ground-truth data and are not inferred here.[4]

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6. Demand drivers

All three children ultimately ride the same wave — discretionary travel and live-experience spending — but sit on different parts of it.

• The business cycle and discretionary income. Leisure travel, packaged tours, event tickets, and vacation-week swaps all get cut in downturns; corporate travel and meetings budgets are among the first to go. The whole group amplifies the cycle, and the recurring-membership sleeve (auto clubs, exchange) is the most resilient part. For scale, the U.S. Travel Association projects total U.S. travel spending near $1.374 trillion in 2026 — the travel economy this group sits inside, not the group's own receipts.[56159]
• Trip complexity and the "experiences over things" shift. Advisors and operators win where do-it-yourself booking is painful and high-stakes (cruises, multi-country itineraries, luxury, groups); simple point-to-point air is the most commoditized. The durable consumer tilt toward experiences feeds tours, activities, and ticketing.[56151][56152][56159]
• International inbound and outbound flows. Roughly 98 million American international trips in 2024, and the National Travel and Tourism Office (NTTO) forecasts inbound arrivals near 70.5 million in 2026 — sensitive to the dollar, visa/border policy, and advisories. A strong dollar helps outbound-focused operators and hurts inbound-dependent destinations.[56152][56159]
• Air/hotel/cruise capacity and channel share drive GDS and platform volumes; hotel occupancy and room rates drive CVB budgets directly.[56159]
• An unusually event-rich window. The 2026 FIFA World Cup across North American host cities, the U.S. Semiquincentennial (America's 250th) in 2026, and the 2028 Los Angeles Olympics are simultaneous tailwinds for host-city bureaus, ticketing, and the reservation flow around them — a rare alignment that lifts multiple children at once.[56159]

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7. Regulation

NAICS is a statistical classification, not a license; there is no single federal license to operate in 5615. Oversight is a patchwork that differs sharply by child.

• State "Seller of Travel" laws are the closest thing to licensing for the commercial children — California (most stringent), Florida, Hawaii, and Washington (Iowa also for agencies) require registration and sometimes bonding. This is the shared baseline for agencies (56151), tour operators (56152), and commercial reservation firms (56159).[56151][56152][56159]
• Air-sales oversight. The U.S. Department of Transportation (DOT) applies refund, charter, and air-fare rules to anyone selling air transportation, and requires industry accreditation to transact (ARC for air settlement, IATAN for international recognition, CLIA for cruise).[56151][56152]
• Consumer-protection pricing. The Federal Trade Commission's (FTC) Unfair or Deceptive Fees Rule — effective May 12, 2025 — mandates all-in pricing for live-event tickets and short-term lodging, ending hidden "drip" fees, and the FTC polices truthful advertising across the group.[56159]
• Bonding of customer money. USTOA's $1 million Travelers Assistance Program bonds each active tour-operator member to protect deposits; agencies and operators holding customer funds face the heaviest compliance load.[56152]
• Antitrust — the hottest zone, concentrated in 56159. After a 2024 Department of Justice (DOJ) suit, a federal jury found Live Nation-Ticketmaster liable on antitrust counts in April 2026, with the DOJ seeking a Ticketmaster divestiture — the single biggest regulatory event hanging over the group's largest ticketing player. Large agency and corporate-travel deals now draw scrutiny too (the DOJ challenged, then dropped, Amex GBT–CWT).[56151][56159]
• Public-money and funding-policy rules (CVBs, 56159). Lodging-tax statutes restrict how proceeds may be spent, and the national marketing body Brand USA is politically contingent — its federal match was cut sharply and its authorization expires in September 2027.[56159]

The unifying investor lesson: the commercial children face fee-and-antitrust risk (mandated transparency and structural remedies compressing take rates), while the civic child faces funding-policy risk (a city redirecting room-tax revenue, or Washington cutting inbound-marketing money).

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8. Consolidation

The three children consolidate in different ways — and the group's structure is a barbell.

• 56151 (Agencies) is a barbell with a squeezed middle: two mega-OTAs dominate online leisure distribution, a few global TMCs dominate managed corporate travel (consistent with CR4 = 61.7%), and a fragmented long tail of independents survives on service, specialization, and consortium buying power. Consolidation is the through-line — Amex GBT's completed 2025 acquisition of CWT, its own 2026 take-private, and continuing PE roll-ups — with large deals now drawing antitrust scrutiny.[56151]
• 56152 (Tour Operators) has no national gatekeeper (HHI ~193); consolidation is private-equity roll-up of legacy family brands driven by succession pressure and the rising cost of technology and marketing (Apollo/The Travel Corporation, KKR/Travelopia), plus selective specialist M&A and vertical integration by the largest global players.[56152]
• 56159 (Other Reservation) mostly consolidated decades ago — the GDS oligopoly and the exchange duopoly formed long ago. Today's action is in secondary ticketing (StubHub's 2025 IPO), travel-tech take-privates (Travelport), and corporate-travel roll-ups, while the civic function does not consolidate as a business ("every city has exactly one bureau"; only the software and venue layers around it do).[56159]

So consolidation at the group level is real but diffuse — it happens in the platform, technology, and venue layers, while the local civic function stays locally governed and the reservation-and-ticketing niches stay concentrated behind their existing leaders.

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9. Risks

Shared across the group:

• Cyclicality and exogenous shocks. Everything here rides discretionary and corporate travel, which crater in recessions and collapse in pandemics, geopolitics, and disasters (2020 was near-existential across all three children). Recurring-membership models are the most resilient sleeve.[56151][56152][56159]
• Disintermediation and AI. Suppliers selling direct, the airlines' New Distribution Capability (NDC) standard, metasearch, AI booking/trip-planning agents, and online platforms all attack the "complexity" moat the middlemen rely on — for agencies, GDS operators, and even the information role of CVBs.[56151][56159]
• Commission and fee compression. Large suppliers and corporate customers negotiate down; OTA take rates face supplier direct-booking pressure; and mandated all-in pricing plus antitrust remedies threaten ticketing economics.[56151][56159]
• Operational liability and customer-fund handling. Refunds, chargebacks, fraud, and prepaid-deposit exposure — a demand shock plus refunds can cause fast liquidity failure, especially for merchant-of-record and deposit-funded businesses.[56152][56159]
• Measurement and opacity risk. The federal figures omit government establishments and non-employers, while public-company filings cover far broader global businesses — neither is a clean read on the code, and most of the ~12,500 firms are tiny, private, and key-person-dependent.[4][56151][56159]

Concentrated by child: tour operators carry the sharpest prepaid-deposit/working-capital fragility and succession risk; the reservation-and-ticketing child carries the heaviest antitrust overhang (Live Nation's case) and secular decline in timeshare; and the civic child carries doubly cyclical funding (a downturn means fewer visitors and a smaller budget) plus federal-marketing retrenchment.[56152][56159]

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10. How to invest & outlook

Treat 5615 as three theses that happen to share a statistical code — not one sector. There is no clean pure-play at any level, so choose a lens.

Public routes:

• Travel distribution (56151) — own the large-cap OTAs Booking (BKNG) and Expedia (EXPE); reach Asia/India growth via Trip.com (TCOM) and MakeMyTrip (MMYT); hold the GDS backbone Sabre (SABR). Note the one corporate-travel pure-play, Amex GBT (GBTG), is going private (arbitrage, not a hold).
• Guided/packaged travel (56152) — Lindblad (LIND) for expedition cruising, Tripadvisor (TRIP) for the Viator marketplace, and TUI / Jet2 / Flight Centre for the integrated global model (foreign-listed, with European/Australian-consumer and currency exposure).
• Reservation, ticketing & membership (56159) — Live Nation (LYV) for the dominant ticketing franchise (antitrust as the swing factor) or the resale pure-plays StubHub (STUB) / Vivid Seats (SEAT); Travel + Leisure (TNL) or Marriott Vacations (VAC) for a timeshare-exchange sleeve (mostly a vacation-ownership developer).

Private and bond routes:

• Private equity / private credit is where tour operators and much of corporate travel actually live — succession-driven roll-ups of family brands, growth capital for adventure/experiences/travel-tech, and credit against deposits and contracted inventory.[56152]
• Municipal hotel-tax and convention-center revenue bonds are the most literal claim on the civic tenth's cash flow — for income investors comfortable with cyclical coverage.[56159]
• Franchise / host-agency ownership is the lowest-capital way into the agency child.[56151]

Due diligence differs by child. Normalize OTA and platform valuations for take rate, booking growth, direct/repeat mix, and marketing efficiency; normalize tour-operator multiples for seasonal working capital, leases, owned assets, and foreign exchange; and for CVB bonds, focus on hotel-tax coverage, funding durability, air access, and future hotel supply.[56151][56152][56159]

Outlook — judgment. The base case is resilient but uneven growth. A genuinely event-rich window (2026 World Cup, the U.S. 250th, the 2028 Olympics) lifts lodging demand, ticketing, and reservation volume across all three children at once — an unusual alignment. Domestic leisure, complex/corporate travel, and recurring memberships look durable and fees are rising; commodity point-to-point bookings, timeshare exchange, and the CVB information role face structural pressure. The two swing factors are AI-driven booking and the NDC transition, plus, for individual names, idiosyncratic legal risk (Ticketmaster antitrust) and funding fights (Brand USA). The winners at every end of this group will share one trait — control of a relationship that is hard to route around: proprietary customer data and corporate workflow, difficult-to-replicate supplier relationships, a platform's grip on the inventory and payment flow, or a bureau's grip on a destination's tax-funded marketing mandate.

Bottom line. NAICS 5615 is a ~$69 billion federal industry group — but that figure is a narrow, employer-only "measured core" that omits commission-versus-trip-value, the small/individual long tail, revenue booked in other codes, and government-run offices. Its ~47/13/40 receipts split hides three unrelated businesses with different owners, different economics, and different threats. You cannot buy the group; you assemble exposure to distribution, guided travel, and reservation/ticketing/membership one slice at a time — and, for the civic tenth, you buy the bonds and adjacencies around a function that isn't for sale.

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Sources

This rollup synthesizes our ground-truth federal statistics for NAICS 5615 and the three already-written child primers. See each child primer for its complete numbered Sources list (Census, DOT, FTC, DOJ, ARC, USTOA, SEC filings, and others).

• [1] Histometrics ground-truth federal figures for NAICS 56151 (Travel Agencies) via the 56151 rollup: U.S. Census Bureau, County Business Patterns 2023 (establishments, employment, payroll) and 2022 Economic Census (firms, receipts $32.34B, CR4 61.7%; HHI suppressed). See primer-56151-DRAFT.md.
• [2] Histometrics ground-truth federal figures for NAICS 56152 (Tour Operators) via the 56152 rollup: County Business Patterns 2023 and 2022 Economic Census (receipts $9.03B; HHI 193.1). See primer-56152-DRAFT.md.
• [3] Histometrics ground-truth federal figures for NAICS 56159 (Other Travel Arrangement and Reservation Services) via the 56159 primer: County Business Patterns 2023 and 2022 Economic Census (receipts $27.646B; HHI 362.1; ~90/10 commercial-vs-civic split). See primer-56159-DRAFT.md.
• [4] Ingested official U.S. federal statistics for NAICS 5615 (this level's ground truth): U.S. Census Bureau, County Business Patterns 2023 (15,704 establishments; 186,812 employees; $19.350B annual and $5.193B Q1 payroll) and 2022 Economic Census — Concentration of Largest Firms (12,519 firms; receipts $69.017B; CR4 34.2% / CR8 41.2% / CR20 52.1% / CR50 64.3%; HHI 396.4). No non-employer counts or per-firm operating metrics supplied at this level.
• [56151] Histometrics child primer — Travel Agencies (U.S.) — NAICS 56151 (and its child 561510), full detail on business models, investable universe, regulation, and risks. primer-56151-DRAFT.md.
• [56152] Histometrics child primer — Tour Operators (U.S.) — NAICS 56152 (and its child 561520), full detail on unit economics, demand drivers, consolidation, and how to invest. primer-56152-DRAFT.md.
• [56159] Histometrics child primer — Other Travel Arrangement and Reservation Services (U.S.) — NAICS 56159 (children 561591 CVBs and 561599 All Other), full detail on the civic-vs-commercial split, ticketing/GDS/exchange economics, and antitrust. primer-56159-DRAFT.md.