Machinery, Equipment, and Supplies Merchant Wholesalers (U.S.)

NAICS 2022 code 4238 — a Histometrics rollup primer for public-market and private investors

This is a NAICS ("North American Industry Classification System," the U.S. federal taxonomy for industries) industry group (4-digit). It bundles six 5-digit industries — 42381 through 42386 — that all do the same basic job (buy machinery and supplies from makers, resell to businesses) but serve six very different end-markets. This page synthesizes the six child primers plus our ground-truth federal statistics for 4238. Its distinctive value is the contrast across the six children — who is big, who is growing, who owns them, and where an investor can actually buy in.

1. Overview

NAICS 4238 is the wholesale-distribution layer of the machinery economy — the middlemen who sit between the factories that build equipment and the businesses that use it. A "merchant wholesaler" here takes title (legally buys and owns the goods), holds them in inventory, and resells them to other businesses rather than to consumers, usually adding local availability, technical advice, financing, and after-sale parts and service.[1]

What ties the six children together is one repeatable business model — spread-and-turns distribution with a razor-and-blades aftermarket — applied to six unrelated hardware worlds: bulldozers and excavators (42381), tractors and combines (42382), factory machinery like pumps and machine tools (42383), the consumable supplies that keep plants running (42384), the gear behind laundromats, car washes and salons (42385), and aircraft parts (42386). For an investor the group is a clean, unglamorous read on the physical economy — how hard America is building, farming, manufacturing, servicing, and flying — and one of the deepest hunting grounds for consolidation ("roll-up") strategies in the country. At roughly $725.6 billion in annual sales across ~35,800 firms,[1] it is large, cash-generative, and mostly private.

One measurement change since the last pass shapes everything below: four of the six children now lead with a newer federal vintage. The Census Bureau's Annual Integrated Economic Survey (AIES) for 2023 has since been published for 42381, 42383, 42384, and 42385, while 42382 and 42386 still carry 2022 Economic Census figures.[2][4][5][6][8] The 2022 Economic Census therefore remains the last common-vintage reading of the group and the only basis on which the children reconcile to the parent — so this page keeps 2022 for anything that has to add up and reports the 2023 figures alongside it.

The reason to look at the group as a group is that these six industries behave very differently. Some are single-brand franchised dealerships gated by a manufacturer's territory grant; others are open-market distributors buying from thousands of suppliers. Some are in a cyclical trough right now; others have structural tailwinds. And the public investor's ability to buy in ranges from "several scaled listed companies" to "essentially nothing" — and that public slice has been shrinking, as §4 sets out. Sections 2 and 4 draw those distinctions out.

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

NAICS narrows step by step: the 4-digit industry group (4238) splits into six 5-digit industries, each of which happens to contain a single 6-digit national industry of the same name (so 42381 = 423810, and so on). The six are not competitors — a farm-equipment dealer and an aircraft-parts distributor never bid against each other. They are six separate product markets filed under one federal heading because they share a distribution model.

The table below is the heart of this page. Sales show the child's current headline figure and, where the vintages differ, the 2022 Economic Census line beneath it; shares are computed on the common 2022 basis (each child's 2022 sales as a percentage of the group's $725.6 billion), because mixing vintages would not add up. Concentration is the top-4-firm and top-50-firm revenue shares (CR4, CR50) and the Herfindahl-Hirschman Index (HHI, a standard antitrust concentration gauge that runs to 10,000 — below 1,500 is "unconcentrated"); "direction of travel" is a forward-looking judgment synthesized from the child primers, not a forecast.

Note that the newer vintage does not move all six the same way: 42383, 42381, and 42385 read higher on the 2023 AIES than on the 2022 Economic Census, while 42384 reads lower ($92.7 billion against $94.6 billion).[5][8] These are different surveys with different collection bases, so the gaps are not growth rates and should not be netted against each other.

The CR50 column, new to this pass, reorders the group. On top-4 share the farm child (30.2%) looks the most concentrated of the two dealer industries; on top-50 share the construction child is well ahead (61.7% versus 55.1%), and aerospace parts leads everything at 69.7%.[2][3][7] The reading: in 42381 and 42386 a few dozen large organizations really do carry most of the volume, while 42383 — where the top 50 hold only 31.7% — has a genuinely long tail beneath the leaders.[4]

Three archetypes fall out of that table, and they are the useful way to think about the group:

• Franchised big-ticket dealers (42381, 42382). Single-brand dealerships — the Caterpillar or John Deere store — whose right to exist is a manufacturer's exclusive territory grant. Caterpillar reported just 41 U.S. dealers at the end of 2025, under sales-and-service agreements that are terminable on 90 days' notice — a sharp illustration of how few organizations carry a major brand nationally, and of how much depends on one counterparty.[2][9] Capital-heavy, floor-plan-financed (see §5), deeply tied to the construction and farm cycles, and mostly private because you cannot simply open one. Together ~37% of the group.
• Open-market industrial distributors (42383, 42384). Buy from thousands of suppliers, sell to factories; the most fragmented children and the ones with the deepest public-market exposure. Together ~52% of the group — the bulk of it.
• Niche and aftermarket specialists (42385, 42386). The two smallest, ~11% combined. One (42385) is a private, PE-favored residual "everything-else" bucket; the other (42386) is really an aerospace-parts business with a regulatory moat (see §7) and the steadiest demand of the six.

For the full scope, boundary lines, company rosters, and detailed economics of any one child, see its own primer (42381–42386).

3. Size (this level's rollup figures)

Ground-truth federal statistics for NAICS 4238 (United States), from the Histometrics dataset. Because the six children partition the group cleanly, their figures reconcile to these totals on the 2022 Economic Census / 2023 County Business Patterns basis — establishment counts sum exactly, employment sums exactly on the CBP basis, and sales and payroll sum to within rounding.

The very high sales-per-employee figure (~$0.9 million) is normal for wholesale distribution and does not mean these are high-margin businesses — the machines' cost passes straight through the wholesaler's books, so revenue dwarfs headcount and the real economics live in the thin spread (see §5). It also varies widely by child, from roughly $0.8 million in industrial machinery to about $1.2 million in construction and mining and $1.4 million in aircraft parts, tracking ticket size rather than productivity.[2][7]

The fragmentation paradox (important). At the group level, the top 4 firms hold just 10.1% of sales (CR4), the top 8 14.1%, the top 20 20.8%, the top 50 29.9%, and the HHI is 40.9 — extraordinarily low, an order of magnitude below the "unconcentrated" threshold.[1] But that group number is misleading if read as one market. Pooling six non-substitute product worlds dilutes any single firm's national share: a company that dominates aircraft-parts distribution counts for nothing in farm equipment. The real concentration lives inside the niches — aerospace parts (42386) runs an HHI of 307.7 with a top-50 share of 69.7%, and the farm and construction dealer children post CR4s of 30.2% and 26.8% — not across the pooled 4238 line.[2][3][7] Both dealer children add a second layer the ratios cannot show: an OEM may authorize only one dealer organization inside a given territory, so the national numbers understate local market power in exactly the children where it matters most.[2][3] A competition regulator would never treat "4238" as a single relevant market; neither should an investor.

How much of the group is not independent distribution at all. This is the clearest thing the newer AIES vintage adds, and it corrects a claim the parent previously made too broadly. Manufacturers' own sales branches and offices are counted inside these wholesale codes, and four children now measure that slice separately: in construction and mining it is $30.9 billion of $136.8 billion (22.6%), in industrial machinery $63.7 billion of $290.9 billion, in industrial supplies $14.7 billion of $92.7 billion (leaving independents at about 84%), and in service-establishment equipment $3.1 billion of $30.2 billion.[2][4][5][6][8] That is the portion of each code that no dealer investor can buy — captive by construction. It is distinct from the captive arms filed under manufacturing (Boeing Distribution, Airbus's Satair, OEM parts operations), which sit outside these codes entirely and remain uncounted.[7]

Undercount and scope caveats. The $725.6 billion is the clean federal core, but it understates the true economic footprint of machinery distribution for reasons that recur across the children:

• Captive manufacturer distribution filed under manufacturing is missing. Aerospace is the extreme case: Boeing Distribution and Satair-type arms, plus HEICO's and Collins Aerospace's distribution operations inside companies classified as manufacturers, fall outside wholesale trade — and so do brokers who never take title (NAICS 425), who move a meaningful share of used and surplus aircraft material.[7]
• The aerospace line is both too broad and too narrow. The Aviation Suppliers Association warns explicitly against reading the 423860 total as an aircraft-parts-distribution market size: it sweeps in ships, railcars, and golf carts while excluding aviation distribution housed inside manufacturing plants, airlines, or repair stations.[7]
• Scope-splitting at the dealer. Real-world equipment dealers also rent machines (NAICS 532412) and run standalone repair shops (NAICS 811310), whose revenue falls in other codes — so the dealer channel's full footprint is larger than 42381/42382 show. On the farm side, lawn-and-garden sales to households are booked under retail codes instead.[2][3]
• Broad-line distributors file under one primary code. Diversified public distributors book machinery-and-supplies revenue that spills across 42383/42384 (and beyond) under a single classification, so the largest listed players' revenue exceeds the census lines they nominally sit in. Third-party researchers put machinery and equipment at roughly a third of a much broader ~$2.9 trillion U.S. industrial-distribution market — a wider lens that should be read as a research estimate, not a federal count.[4][5]
• Residual-category blur and non-employer firms. Service-establishment equipment (42385) is an explicit "everything-else" bucket whose mixed-line distributors get split across neighbouring codes, and County Business Patterns omits the smallest sole-proprietor distributors and brokers with no payroll — a meaningful tail in the more fragmented, individually-owned niches.[6]

One more measurement note: the firm count does not sum cleanly (the six children total 36,352 firms, versus 35,802 at the group). That is expected — a company operating in two children is counted once at the parent — and it is the only figure that is de-duplicated rather than added. Establishments do sum exactly (4,701 + 7,500 + 25,949 + 9,605 + 5,296 + 2,375 = 55,426), as does employment on the CBP basis — though the farm child now carries an employment range of ~113,000–115,000 rather than a point estimate, because the Bureau of Labor Statistics counts the same industry slightly differently from the Census Bureau.[3][32]

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

Two facts govern the whole group. First, most of the industry is private — family-owned dealerships, regional distributors, and private-equity ("PE") buy-and-build platforms — so the listed slice is a minority of the economics everywhere. Second, where you can invest depends entirely on which child you mean, and the public opportunity is lopsided toward the open-market industrial distributors.

A third fact has emerged since the last pass and cuts against the first two: the listed set is getting smaller, not larger. DNOW absorbed MRC Global in November 2025, removing MRC as a separate public exposure; Distribution Solutions Group agreed in July 2026 to be taken private by affiliates of LKCM Headwater; and the industrial-machinery child now describes the net effect as "fewer, larger listed ways in."[4][17] The one offset runs the other way — Genuine Parts announced in February 2026 a plan to separate its industrial and automotive businesses, which would eventually leave Motion as a standalone listed industrial distributor, targeted for roughly Q1 2027.[5][15]

• Deepest public access — Industrial Machinery & Supplies (42383, 42384). The scaled listed distributors cluster here and overlap heavily: Applied Industrial Technologies (NYSE: AIT, ~$4.6 billion fiscal 2025 revenue), Motion (the industrial segment of Genuine Parts Company, NYSE: GPC, ~$8.9 billion of 2025 segment sales and about 37% of GPC revenue), MSC Industrial Direct (NYSE: MSM, ~$3.77 billion fiscal 2025), DXP Enterprises (Nasdaq: DXPE, ~$2.0 billion), DNOW (NYSE: DNOW, ~$2.5 billion pro forma after MRC), Global Industrial (NYSE: GIC, ~$1.38 billion 2025), and the broad-line maintenance-repair-and-operations ("MRO") leaders W.W. Grainger (NYSE: GWW, ~$17.9 billion fiscal 2025) and Fastenal (Nasdaq: FAST, ~$8.2 billion fiscal 2025). None is a pure play on a single census code — their combined revenue exceeds either census line because their business is wider — but this is the one place an ordinary equity investor can own the model at scale.[4][5][14][15][16][17]
• Thin, indirect access — the franchised dealers (42381, 42382). Value here is overwhelmingly in private single-brand dealerships whose ownership is gated by the manufacturer: HOLT CAT, Ring Power, Empire Southwest on the Caterpillar side; United Ag & Turf (~97 ag locations), Ag-Pro (~84) and RDO (~34 ag stores of ~86 total) on the Deere side, several exceeding $2 billion of revenue.[2][3][24] The listed pure-plays are a short list of small/mid-cap dealer roll-ups — Alta Equipment Group (NYSE: ALTG, ~$1.84 billion 2025, the cleanest U.S. construction pure-play), Titan Machinery (Nasdaq: TITN, $2.43 billion in fiscal 2026, of which $1.56 billion is U.S. agriculture across 90 stores — the cleanest ag name, not a clean construction one), Custom Truck One Source (NYSE: CTOS, $1.944 billion 2025), and the large Canadian Caterpillar dealers Finning International (TSX: FTT, ~C$11.2 billion 2024) and Toromont Industries (TSX: TIH, ~C$5.0 billion 2024), with Wajax (TSX: WJX) as a multi-line Canadian alternative.[2][3][10][11][12][13] Most public investors instead reach this cycle through the manufacturers — Caterpillar, Deere, Komatsu, CNH, AGCO.
• Aerospace-aftermarket access — Transportation (42386). Listed proxies are the independent aviation-parts distributor/MRO firms AAR Corp. (NYSE: AIR, ~$2.8 billion of sales, with a $1.1 billion Parts Supply segment) and VSE Corp. (Nasdaq: VSEC), now a pure-play aviation aftermarket business after selling its fleet-parts arm, with more than $1.1 billion of 2025 aviation revenue and distribution up 46% year over year; plus HEICO (NYSE: HEI/HEI.A, $4.485 billion fiscal 2025 net sales, ~$3.1 billion in Flight Support), which blends parts manufacturing with large-scale distribution. The biggest distribution arms sit captive inside Boeing and RTX — Boeing Distribution alone states it carries more than a million part numbers from 65-plus locations.[7][20][21]
• Essentially no public access — Service Establishment (42385). The purest listed play remains a single small-cap commercial-laundry distributor, EVI Industries (NYSE American: EVI, ~$390 million in the year to June 2025) — founder-controlled and thinly traded. Sally Beauty Holdings (NYSE: SBH) now supplies a partial proxy: its Beauty Systems Group / CosmoProf professional-salon distribution segment is roughly 43% (~$1.61 billion) of $3.72 billion fiscal 2025 revenue, with the rest consumer retail. Beyond those the fit degrades fast — Cintas, on $10.34 billion of fiscal 2025 revenue, is ~95% route servicing and is a distributor substitute rather than a wholesaler. The scale is private: Uline (family-held, estimated ~$9–11 billion); Imperial Brady, the merged Imperial Dade + BradyPLUS platform at roughly $10 billion; car-wash consolidators Sonny's and National Carwash Solutions.[6][18][19]

There is no exchange-traded fund (ETF) that targets NAICS 4238 or any of its children; the listed names appear inside broad industrials and capital-goods index funds. Tickers, yields, and valuation multiples are the right lens only in this investable-universe framing — in the operating business itself, think in the distributor economics of §5.

5. How the money works

Across all six children the model is the same: buy from makers, resell to businesses at a markup, and earn a return on the working capital tied up in inventory and receivables. It is a spread-and-turns business — a modest gross margin multiplied by how many times a year you cycle inventory — not a fat-margin manufacturing business. The balance sheet is the business: inventory and accounts receivable are the biggest assets, so working-capital discipline, high fill rates (having the right part in stock), and inventory turns are the core skills.

The most useful thing the group view adds is the margin ladder — the bigger the machine, the thinner the spread. Alta's 2025 dealer book ran a 25.9% consolidated gross margin, built from 14.1% on new and used equipment, 34.6% on parts, 59.4% on service, and 30.5% on rentals.[11] The open-market machinery distributors sit near 30% (Applied Industrial 30.3%, Motion 30.6%).[14][15] The supplies distributors run 39–45% (Grainger 39.1%, MSC 40.8%, Fastenal 45.0%).[16] And EVI, in the service-equipment niche, has lifted consolidated gross margin from about 23% in fiscal 2019 past 30% precisely by shifting mix toward parts and technical service.[18] Operating margin, though, varies more within a child than across the group: inside 42384 alone, 2025 operating margins ran Fastenal 20.2%, Grainger 13.9%, and MSC 8.0% — a function of product mix, customer concentration, and service model, not of the census label.[5][16] Underwrite the business model, not the code.

Three features recur and are worth internalizing:

• The razor-and-blades aftermarket. In every child, the equipment sale is thin-margin and the follow-on parts and service are fat-margin and recurring. Titan's fiscal 2026 disclosure is the cleanest public proof: equipment produced 73.1% of revenue but only 33.8% of gross profit, while parts and service together produced 24.9% of revenue and 63.2% of gross profit.[10] The guiding metric is the absorption rate — parts-and-service gross profit as a share of fixed operating cost — though the children set the bar differently: the construction primer says well-run dealers aim near or above 100%, while the farm primer puts the target at 80%-plus, with Titan running 75.2% company-wide in fiscal 2026 mid-downturn.[2][3][10] In aerospace (42386) the same idea appears as an availability premium: a grounded jet ("aircraft-on-ground") costs an operator tens of thousands of dollars an hour, so having the part now is the product, and roughly 80% of aerospace-parts distribution is tied to maintenance rather than new-build.[7][23] In industrial supplies (42384) roughly two-thirds of sales are recurring consumables. The aftermarket is why these businesses are steadier than their cyclical headline sales suggest.
• Floor-plan financing and interest-rate sensitivity. The big-ticket dealer children (42381, 42382) finance inventory with floor-plan financing — short-term revolving credit, often from the manufacturer's captive lender, repaid as machines sell — so interest rates hit them twice, on the dealer's own inventory carry and on the customer's purchase financing. The scale is not incidental: Titan carried $553.8 million of floorplan payables at January 2026 against facilities of $875 million (CNH Capital), $390 million (wholesale) and $70 million (DLL), and estimated that a one-point rate rise would cost about $2.9 million of annual pretax earnings.[2][3][10] The lighter-inventory children (42384, 42385, 42386) are less levered to rates but still rise and fall with working-capital cost.
• Capital-light in fixed assets, capital-heavy in working capital. Applied Industrial spent $27.2 million of capex against $4.6 billion of sales, yet carried $505 million of inventory and $770 million of net receivables, turning inventory 4.3 times with days sales outstanding of 56.6.[14] The same shape shows up in aerospace, where VSE ended 2025 with $554 million of inventory on $1.1 billion of revenue and AAR held $809 million.[20] Stickiness is bought with capital: Fastenal finished 2025 with roughly 124,000 vending devices installed at customer sites, and employee-related costs still ran 70–75% of its selling, general and administrative expense — this is a service model, not a warehouse model.[5][16]

The metrics that matter here are organic sales growth, gross and incremental margin, inventory turns, absorption rate (for dealers), fill rate, cash-conversion cycle, and return on invested capital — not the rate-base, funds-from-operations, or all-in-sustaining-cost gauges used in utilities, REITs, or mining. A useful quirk: free cash flow often rises in a downturn as distributors liquidate inventory faster than sales fall — Titan deliberately cut inventory by roughly $419 million through fiscal 2025 while posting a net loss.[10]

6. Demand drivers

Because the group spans six end-markets, its aggregate demand is a blend of several unrelated cycles — which is itself a feature: weakness in farm equipment can coincide with strength in aerospace, smoothing the group even as any one child swings.

• Industrial production & manufacturing activity drives the two biggest open-market children (42383, 42384). The master gauges are the Federal Reserve's Industrial Production Index and capacity utilization — which Genuine Parts identifies as the primary demand variables for Motion — plus the ISM PMI (the Institute for Supply Management's Purchasing Managers' Index — above 50 signals factory expansion). The transmission is close to direct: MSC drew 67% of fiscal 2025 revenue from manufacturing customers and Fastenal estimated 71–76% of its 2025 business was with manufacturers. Structural tailwinds: reshoring, factory automation and robotics, oil-and-gas capital spending for the pump-heavy distributors, and heavy data-center, warehouse and logistics build-out. Procurement is also digitizing fast — MSC reported e-commerce channels at 63.8% of fiscal 2025 sales.[4][5][15][16][29]
• Construction & mining capital spending drives 42381. U.S. construction put in place totaled $2.16 trillion in 2025 — $1.65 trillion private (down 2.9%) and $517 billion public (up 3.6%), a mix that favors dealers with road and infrastructure exposure over those levered to private buildings — with data-center construction up roughly 30% year on year late in 2025. On the mining side, USGS put U.S. nonfuel mineral production at $112 billion in 2025, 6% above 2024, and the Department of Energy announced nearly $1 billion of intended critical-minerals funding in August 2025. Caterpillar's construction-industries sales rose ~8% and resource-industries ~9% in 2025 against a record ~$39.8 billion backlog.[2][9][27]
• The farm economy drives 42382, and it is the group's downdraft. USDA forecast 2025 net farm income up ~37% to about $179.8 billion — but the gain came from livestock and government payments while crop receipts fell, and crop farmers buy the biggest iron. The May 2026 forecast puts 2026 net farm income at $153.4 billion, down 0.7% nominally and 2.6% after inflation. Units confirm it: U.S. tractor sales fell ~9.9% in 2025 to ~195,900 and combines ~35.6% to ~3,579, with tractors down a further 12.4% and combines 14.6% year over year through May 2026. Offsetting that is a replacement driver largely independent of the commodity cycle — precision agriculture, with USDA finding guidance and autosteering on 52% of midsize and 70% of large crop farms in 2023.[3][26]
• Service-business health and utilization drive 42385: openings of salons, laundromats, commercial laundries, car washes and cleaning contractors, plus municipal water-utility capital budgets. Equipment lasts 7–15+ years, so most sales are replacement and the repair-versus-replace decision is rate-sensitive. Labor scarcity is the structural pull — robotic floor cleaning has moved into mainstream adoption, which creates installation, maintenance and fleet-management work for distributors rather than simply displacing tool sales.[6]
• The size and age of the global flying fleet drives 42386 — the installed base, not new deliveries. Boeing projects the world fleet roughly doubling toward ~50,000 aircraft by 2044, and the FAA's fiscal-2025 forecast has the U.S. commercial fleet growing from 7,387 aircraft in 2024 to 10,607 by 2045 (1.7% a year), with large cargo jets rising from 861 to 1,399 — each needing decades of maintenance.[7][22]

The common thread beneath all of them is a recurring maintenance floor — parts and service demand that is hard to defer for long, because a stalled line, a grounded jet, or a broken-down harvester costs far more than the part that fixes it. That floor is what keeps the group cash-generative through downturns.

7. Regulation

Distribution itself is lightly regulated at the industry level — there is no sector-specific price or entry regulator for machinery wholesalers, and no rate base or licensing regime like utilities, finance, or health care. Barriers to entry come from scale, inventory, capital, and relationships, not from a regulatory franchise. The regulatory exposure that matters is mostly indirect, product-specific, and varies by child:

• General goods-handling rules apply to all six: Occupational Safety and Health Administration (OSHA) workplace rules, Department of Transportation (DOT) hazardous-materials shipping rules, and Environmental Protection Agency (EPA) rules for certain chemicals. One of these is newly distributor-facing: OSHA's amended Hazard Communication Standard took effect July 19, 2024, revising the chemical labels and safety data sheets a distributor must pass downstream.[30]
• Product-specific obligations land directly on the distributor in 42385, which is the most rule-touched of the six despite being the smallest. Disinfectants making pesticidal claims fall under FIFRA, where repackaging or relabeling can itself constitute pesticide "production" requiring a registered establishment; salon distributors acquire cosmetic listing obligations under MoCRA whenever they are the "responsible person" on a label; and the child primer corrects a common overstatement — the FTC Funeral Rule does not cover a seller of caskets alone, though it still creates substitution pressure because funeral homes must accept externally purchased caskets without a handling surcharge.[6][30]
• Dealer-franchise laws (state statutes governing how a manufacturer can terminate or decline to renew a dealer, and inventory repurchase) shape the franchised children 42381 and 42382 — protections that matter precisely because the underlying manufacturer agreement is itself short-fused, terminable on 90 days' notice in Caterpillar's case.[2][3][9]
• Right to repair is the fastest-moving issue in farm equipment (42382), and it has now landed. Colorado's law took effect January 1, 2024, and in July 2026 the Federal Trade Commission and five states settled with Deere, requiring the company for ten years to give farmers and independent repairers access on fair terms to repair capabilities equivalent to authorized dealers' — including fault-code clearing, component pairing, emissions-shutdown restart, and technical guidance. That is a direct assault on dealers' highest-margin work.[3][25]
• Emissions standards (EPA off-road / Tier 4 diesel rules) raise new-machine cost and periodically accelerate fleet replacement in construction and farm equipment; mine-safety approvals (MSHA certification of equipment for underground and gassy mines) add compliance work that supports authorized service demand in 42381.[2][31]
• Aerospace quality and safety regulation is a genuine moat for 42386 — with one nuance the child primer makes explicit: FAA distributor accreditation under Advisory Circular AC 00-56B, commonly met via the ASA-100 industry standard, is voluntary and strongly endorsed, not a mandatory license. What is mandatory is traceability: parts must trace to an approved design and production source (the original manufacturer or a Parts Manufacturer Approval holder), a distributor cannot certify airworthiness merely by selling a part, and the FAA runs a Suspected Unapproved Parts program to catch bogus components. Add ITAR and EAR export controls. These systems are hard to build and favor incumbents.[7][22]
• Small-business size standards differ by child and matter to anyone selling into federal set-asides: 250 employees in 42381, 125 in 42382, 42384 and 42385, and 175 in 42386.[2][3][5][6][7][32]
• Trade policy and tariffs are a live swing factor across the entire group — Section 232 (steel/aluminum) and Section 301 (China) tariffs raise the landed cost of imported machines, parts, and supplies. The recent path is concrete: a 50% tariff on imported steel and aluminum took effect in August 2025 (Deere flagged roughly $600 million of 2025 impact and ~$1.2 billion projected for fiscal 2026; CNH ~$120 million), partially eased by a June 2026 cut in equipment tariffs to 15%. Distributors generally pass tariffs through but face margin-timing risk and softer demand amid price uncertainty.[3][28]

8. Consolidation

The defining strategic fact for the whole group is fragmentation being slowly rolled up. With ~35,800 firms and 55,400 establishments, there are far more locations than firms — the signature of multi-branch consolidators. The clearest evidence now sits in the federal data itself: in industrial machinery, firm counts fell from 22,773 in 2017 to 18,795 in 2022 and establishments from 29,871 to 25,700 — roughly 4,000 companies absorbed in five years, even as sales grew.[4]

But the shape of consolidation differs by archetype:

• Franchised dealers (42381, 42382) consolidate within a brand — the manufacturer steers territories toward larger, better-capitalized multi-location groups that can fund rental fleets, technician training, and precision-ag support (Titan and Alta on the listed side; large private groups like RDO, Brandt, United Ag & Turf, Ag-Pro). The 2024 "Big Dealer" report counted 206 ag groups with five-plus locations — down from a 2022 peak of 214 as the big groups themselves merge — together holding roughly 39% of North American ag stores.[3][24] Entry is nearly impossible without a manufacturer's grant, so growth is M&A, not greenfield. The adjacent rental channel is consolidating harder still and increasingly overlaps the dealer channel: Herc outbid United Rentals for H&E Equipment Services at ~$5.3 billion (closed June 2025).[2][12]
• Open-market distributors (42383, 42384) consolidate across an open field of thousands of independents — landmark deals include Motion's $1.3 billion purchase of Kaman Distribution and CD&R's buyout of SunSource, with 2025's DNOW/MRC Global combination showing the same logic at the top of the market — while defending against disintermediation from OEM-direct selling and marketplaces (Amazon Business).[4][15][17] An important correction to the old parent's framing: this is not a steady cadence. Trade press reported industrial-distribution deal activity down considerably in 2025 amid tariff and macroeconomic uncertainty, so a roll-up thesis has to underwrite lumpy, cycle-and-financing-dependent deal flow rather than a metronome.[29]
• Niche specialists (42385, 42386) are prime PE roll-up terrain. In service equipment, EVI has rolled up commercial-laundry distributors since 2016; Imperial Dade had completed its ninety-sixth acquisition under current family leadership by January 2025 and then merged with BradyPLUS in March 2026 to create Imperial Brady, a ~$10 billion platform with more than 13,000 employees and 125-plus facilities — though much of that revenue sits in chemicals, paper and packaging outside this code, so it should not be read as 42385 concentration.[6][19] In aerospace the cheques are larger: Boeing built its distribution arm by buying Aviall (~$1.7 billion, 2015) and KLX Aerospace (~$4.25 billion, 2018); HEICO acquired Wencor for ~$2.05 billion in 2023; VSE bought Kellstrom (2024) and Precision Aviation Group (2025); AAR acquired ADI in 2025; and Bain Capital took a majority interest in FDH Aero in June 2026.[7][20][21]

Two consequences worth holding together. First, because national concentration is so low (§3), consolidation is a durable engine of value creation rather than a story that is nearly finished — but it is a within-niche, episodically-paced game. Second, none of it shows in the concentration ratios above, which are 2022 vintage: the measured HHIs understate where these industries now stand. And consolidation increasingly runs through the public market rather than into it — DNOW/MRC and the DSG take-private each removed a listed way in.[4][6][17]

9. Risks

The risk set is common in kind across the group, differing in degree by child:

• Cyclicality. Big-ticket, deferrable equipment sales swing hard with their underlying cycle — sharpest in farm right now, where Titan's U.S. agriculture same-store sales fell 17.4% in fiscal 2026 and the segment posted a $28.9 million pretax loss despite material inventory reductions; milder in industrial supplies (42384) and aerospace aftermarket (42386, the steadiest).[3][10]
• Inventory, floor-plan, and interest-rate risk. Debt-financed inventory whose value can drop in a slowdown — the 2023 Chapter 11 of aerospace distributor Incora is the cautionary tale of leverage plus working capital meeting a demand dip, and even a healthy operator carries the exposure: AAR's auditor flagged slow-moving-inventory valuation as a critical audit matter against $809 million of inventory at fiscal-2025 year-end.[7][20][23] Rate sensitivity is highest in the floor-plan-financed dealer children. Residual values are a second-order version of the same risk — Herc's rental-equipment sale margin fell from 28% in 2024 to 18% in 2025 as used prices normalized, and those marks flow back into dealer trade-in economics.[2][12]
• Supplier / OEM concentration and disintermediation. Single-brand dealers live and die with one manufacturer — Titan reported that CNH products generated approximately 75% of its fiscal 2025 new-equipment revenue — and face allocation, territory, warranty-reimbursement and change-of-control risk on top. Open-market distributors face OEM-direct selling and e-commerce commoditizing catalog orders, with online price discovery eroding margin opacity.[2][3][4][10]
• Tariffs and supply chain. Group-wide cost pressure, and pass-through is not automatic: Alta said tariff costs were not fully recovered in 2025, contributing to a 100-basis-point decline in new-and-used-equipment margins. A 2025 NAW/MDM survey of wholesale distributors found 62% expecting cost of goods sold to rise by at least 10%, 67% reporting a negative business impact, and 48% slowing inventory replenishment — across wholesale distribution generally, not this code specifically, but indicative of the sensitivity.[11][28]
• Deflation and price-timing risk. The mirror image of tariffs: falling selling prices compress revenue and gross-profit dollars at stable volumes while high-cost inventory sits on hand, and contracted customer prices often reset more slowly than supplier costs.[5][14]
• Aftermarket erosion. The July 2026 FTC/Deere right-to-repair settlement (42382) and OEMs reclaiming aftermarket margin threaten the high-margin service annuity that anchors the model.[3][25]
• Skilled-technician shortage. A persistent constraint on the highest-margin service work across every child, and a measurable one: the farm child alone rests on a base of 24,770 farm-equipment mechanics and service technicians.[2][3][32]
• Roll-up execution risk. Overpayment and integration failure in the buy-and-build strategies that dominate the group, plus leverage at PE-backed platforms, loss of local salespeople, and supplier resistance to concentrated buyer power. Balance-sheet cousins: inventory obsolescence when supplier lines or platforms change, and credit losses on receivables, which rise in downturns among smaller manufacturers and energy customers.[4][6]

10. How to invest & outlook

How to invest — pick the archetype first. The single most useful decision is which of the three archetypes you want, because it determines whether public exposure even exists:

• For public-market liquidity, own the open-market industrial distributors (42383/42384). This is the only part of the group with several scaled, listed, high-quality names (AIT, MSM, DXPE, DNOW, GIC, plus broad-line GWW and FAST), and the Motion separation targeted for around Q1 2027 would add a large focused pure-play. Judge them on organic growth versus industrial production, margin durability, cash conversion, inventory turns, return on invested capital, and acquisition track record — and note that the listed menu is narrowing, so entry points are becoming scarcer rather than more plentiful.[4][5][15][17]
• For the construction/farm cycle, use the manufacturers or the dealer roll-ups. Direct dealer exposure is thin and higher-beta; be precise about which cycle you are buying — ALTG is the cleanest listed construction distributor, TITN the cleanest ag one, CTOS is vocational trucks, and FTT/TIH/WJX are Canadian. The OEMs (Caterpillar, Deere, Komatsu, CNH, AGCO) give broader, more liquid access to the same demand; equipment rental (URI, HRI, EQPT, Ashtead) and the used/auction channel (RB Global) are adjacent plays on the same cycle with different economics.[2][3][10][11][12][13]
• For aerospace aftermarket, use AAR, VSE, or HEICO — the steadiest end-market of the six — with Boeing, RTX, and TransDigm offering the exposure bundled inside larger businesses.[7][20]
• For the private route — the majority of the group's economics — buy, operate, or roll up a regional distributor or single-brand dealership (gated by the manufacturer in the franchised children), or back a PE buy-and-build platform. This is the only way into the service-establishment niche (42385) at scale. Diligence in the franchised children centres on OEM consent and termination rights, territorial exclusivity, installed field population, technician retention, inventory aging, used marks, floor-plan terms, and customer concentration; in the open-market children on customer concentration, gross-margin quality, supplier authorizations, SKU-level turns and obsolescence, branch density, and how much revenue is embedded through vending, onsite, or procurement integration; in aerospace on distribution-right renewal, inventory aging by platform, traceability controls, and turns.[2][3][5][7]

Outlook (judgment, not a forecast). The group's diversified end-markets mean its aggregate is steadier than any one child. Entering 2026 the picture is mixed and self-hedging: farm equipment (42382) is the deepest in trough, with unit sales still falling through May 2026, a used-equipment overhang, and 2026 net farm income forecast lower in real terms — offset only by an aging fleet, the parts-and-service cushion, and June 2026 tariff relief; construction/mining (42381) is two-sided — firm on infrastructure, data-center and grid buildout, and mining fleet renewal (record OEM backlogs), soft on private nonresidential buildings and still pressured by rates and tariffs; industrial machinery and supplies (42383/42384) track the manufacturing cycle with structural reshoring, automation, and data-center tailwinds; aerospace parts (42386) grows steadily with a fleet the FAA expects to expand ~1.7% a year for two decades; and service-establishment equipment (42385) consolidates through the cycle, with lower rates the trigger for deferred replacement demand.[2][3][6][7][22][26][27][28] Across all six, the recurring parts-and-service aftermarket is the ballast, and the fragmentation that defines the group makes consolidation a durable source of returns — durable, but lumpy: M&A velocity follows the cycle and financing conditions, as 2025's slowdown showed.[29] This is a family of slow-and-steady cash compounders, not a hyper-growth story — best judged on absorption, service growth, turns, and disciplined M&A rather than headline equipment volume. For the complete treatment of any child — company rosters, unit economics, and detailed outlook — see its own primer (42381 through 42386).

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Sources

This rollup synthesizes the six child primers (NAICS 42381–42386) plus the Histometrics ground-truth federal statistics for NAICS 4238. Citations below are drawn from those child primers and the level dataset.

1. U.S. Census Bureau, 2022 Economic Census (receipts, firms, concentration ratios, HHI) and 2023 County Business Patterns (establishments, employment, payroll), NAICS 4238 — as compiled in the Histometrics federal-statistics ground-truth dataset. https://www.census.gov/naics/; https://www.census.gov/programs-surveys/economic-census.html
2. Histometrics primer and federal statistics for NAICS 42381 / 423810 — Construction and Mining (except Oil Well) Machinery and Equipment Merchant Wholesalers (sales on both vintages, manufacturers'-sales-branch share, concentration ratios, dealer economics, absorption, scope caveats). Census EC 2022 / CBP 2023. https://data.census.gov/profile/423810_-_Construction_and_Mining_%28except_Oil_Well%29_Machinery_and_Equipment_Merchant_Wholesalers?codeset=naics~423810&g=010XX00US
3. Histometrics primer and federal statistics for NAICS 42382 / 423820 — Farm and Garden Machinery and Equipment Merchant Wholesalers (sales, firm and establishment counts, employment range, concentration ratios, dealer revenue and margin mix, absorption target, boundary caveats). Census EC 2022 / CBP 2023. https://www.census.gov/naics/?input=423820
4. Histometrics primer and federal statistics for NAICS 42383 / 423830 — Industrial Machinery and Equipment Merchant Wholesalers (2023 AIES sales and branch split, 2022 receipts and 18,795 firms, CR4 8.3% / CR50 31.7% / HHI 34.7, 2017–2022 firm-count decline, third-party market context). Census EC 2022 / CBP 2023. https://data.census.gov/profile/423830_-_Industrial_Machinery_and_Equipment_Merchant_Wholesalers?codeset=naics~423830
5. Histometrics primer and federal statistics for NAICS 42384 / 423840 — Industrial Supplies Merchant Wholesalers (2023 AIES sales and 84/16 independent-vs-branch split, 2022 receipts, CR4 19.7% / CR50 49.7% / HHI 139.2, MRO market context). Census EC 2022 / CBP 2023. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN; https://data.census.gov/table/CBP2023.CB2300CBP
6. Histometrics primer and federal statistics for NAICS 42385 / 423850 — Service Establishment Equipment and Supplies Merchant Wholesalers (2023 AIES sales and branch split, CR4 19.5% / CR50 52.5% / HHI 154.6, residual-category, jansan-boundary and non-employer caveats). Census EC 2022 / CBP 2023. https://data.census.gov/profile/423850_-_Service_Establishment_Equipment_and_Supplies_Merchant_Wholesalers?codeset=naics~423850
7. Histometrics primer and federal statistics for NAICS 42386 / 423860 — Transportation Equipment and Supplies (except Motor Vehicle) Merchant Wholesalers (sales, 1,920 firms, CR4 29.3% / CR50 69.7% / HHI 307.7, aerospace-aftermarket and captive-distribution caveats); Aviation Suppliers Association, "How Big Is the U.S. Aircraft Parts Distribution Industry?" (NAICS scope caveats). Census EC 2022 / CBP 2023. https://www.census.gov/naics/?input=423860&year=2022; https://www.aviationsuppliers.org/asa-member-bulletin---feb-2020---how-big-is-the-us-aircraft-parts-distribution-industry
8. U.S. Census Bureau, Annual Integrated Economic Survey (AIES), reference year 2023 — sales and merchant-wholesaler vs. manufacturers'-sales-branch splits for NAICS 423810, 423830, 423840, and 423850, 2023–2026. https://data.census.gov/table?codeset=naics~423810&g=010XX00US; https://data.census.gov/table/AIESINVTIMESERIES.AIES00INV?codeset=naics~423830&g=010XX00US; https://data.census.gov/table/AIESBASICTIMESERIES.AIES42BASIC?codeset=naics~423840; https://data.census.gov/table?codeset=naics~423850&g=010XX00US
9. Caterpillar Inc., Form 10-K for fiscal 2025 (dealer sales-and-service agreements, exclusive territories, 90-day termination, 41 U.S. dealers) and Q3 2025 earnings / FY2025 results (record ~$39.8 billion backlog; construction-industries and resource-industries sales; tariffs; dealer inventory), 2025–2026. https://www.sec.gov/Archives/edgar/data/18230/000001823026000008/cat-20251231.htm; https://s25.q4cdn.com/358376879/files/doc_financials/2025/q3/3Q-2025-Caterpillar-Inc-Earnings-Call-Transcript_-10-29-2025.pdf
10. Titan Machinery Inc., Form 10-K for fiscal 2026 (consolidated and U.S. agriculture revenue, store count, revenue-versus-gross-profit mix, 75.2% absorption, $553.8 million floorplan payables and rate sensitivity, floor-plan facilities, same-store sales, segment pretax loss) and fiscal 2025 full-year results (revenue, net loss, inventory reduction, CNH supplier concentration), 2025–2026. https://www.sec.gov/Archives/edgar/data/1409171/000162828026022376/titn-20260131.htm; https://www.globenewswire.com/news-release/2025/03/20/3046062/0/en/Titan-Machinery-Inc-Announces-Results-for-Fiscal-Fourth-Quarter-and-Full-Year-Ended-January-31-2025.html
11. Alta Equipment Group Inc., Form 10-K for fiscal 2025 (revenue ~$1.84 billion; gross margins of 14.1% new and used equipment, 34.6% parts, 59.4% service, 30.5% rentals, 25.9% consolidated; tariff costs not fully recovered; 100-basis-point equipment-margin decline), 2026. https://www.sec.gov/Archives/edgar/data/1759824/000119312526076932/altg-20251231.htm
12. Adjacent specialty-truck and rental channel: Custom Truck One Source, Inc., full-year 2025 results (record revenue $1,944.0 million); EquipmentShare IPO, January 2026; Herc Holdings / United Rentals bid for H&E Equipment Services (~$5.3 billion, closed June 2025); Herc Holdings Form 10-K fiscal 2025 (rental-equipment sale margin 28% → 18%); United Rentals Form 10-K fiscal 2025 (86% rental revenue, ~2% new-equipment sales), 2025–2026. https://www.stocktitan.net/news/CTOS/custom-truck-one-source-inc-reports-fourth-quarter-and-full-year-opi2wzt0xooo.html; https://www.equipmentshare.com/press-releases/equipmentshare-prices-initial-public-offering; https://www.rermag.com/news-analysis/headline-news/article/55269324/; https://www.sec.gov/Archives/edgar/data/1364479/000136447926000050/hri-20251231.htm; https://www.sec.gov/Archives/edgar/data/1047166/000106770126000007/uri-20251231.htm
13. Finning International Inc., 2024 Annual Financial Report (world's largest Caterpillar dealer; 2024 revenue) and Toromont Industries Ltd., 2024 fourth-quarter and full-year results (total revenue C$5,021.2 million), 2025. https://www.finning.com/content/dam/finning/Shared/ir-events-attachments/2024-annual-financial-report.pdf; https://investor.toromont.com/2025-02-11-TOROMONT-ANNOUNCES-2024-FOURTH-QUARTER-AND-FULL-YEAR-RESULTS-AND-INCREASES-QUARTERLY-DIVIDEND
14. Applied Industrial Technologies, Inc., Fiscal 2025 Form 10-K (revenue $4.563 billion; gross margin 30.3%; operating margin 10.9%; inventory $505 million; receivables $770 million; inventory turns 4.3x; DSO 56.6 days; capex $27.2 million), 2025. https://www.sec.gov/Archives/edgar/data/109563/000010956325000080/ait-20250630.htm
15. Genuine Parts Company, 2025 Form 10-K (Motion/Industrial segment sales ~$8.9 billion; gross margin 30.6%; segment EBITDA margin 12.9%; industrial production and capacity utilization as primary demand variables) and "Plan to Separate Automotive and Industrial Businesses," February 17, 2026. https://www.sec.gov/Archives/edgar/data/40987/000004098726000003/gpc-20251231.htm; https://www.genpt.com/2026-02-17-Genuine-Parts-Company-Announces-Plan-to-Separate-Automotive-and-Industrial-Businesses-Into-Two-Industry-Leading-Public-Companies
16. W.W. Grainger, Inc., 2025 Form 10-K (revenue ~$17.9 billion; gross margin 39.1%; operating margin 13.9%; private label ~19% of U.S. stocked-product sales); MSC Industrial Direct Co., Inc., fiscal 2025 Form 10-K (net sales ~$3.77 billion; gross margin 40.8%; operating margin 8.0%; 67% manufacturing customers; e-commerce 63.8% of sales); Fastenal Company, 2025 Form 10-K (net sales ~$8.2 billion; gross margin 45.0%; operating margin 20.2%; ~124,000 FASTVend devices; employee costs 70–75% of SG&A; 71–76% manufacturing customers), 2025–2026. https://www.sec.gov/Archives/edgar/data/277135/000027713526000011/gww-20251231.htm; https://www.sec.gov/Archives/edgar/data/1003078/000100307825000123/msm-20250830.htm; https://www.sec.gov/Archives/edgar/data/815556/000081555626000009/fast-20251231.htm
17. DNOW Inc., 2025 Form 10-K (MRC Global acquisition completed November 2025); DXP Enterprises, Inc., 2025 Form 10-K (revenue $2.016 billion); Distribution Solutions Group, Inc., Form 8-K on the definitive agreement to be acquired by LKCM Headwater (July 2026) and 2025 Form 10-K; Global Industrial Company, Form 10-K fiscal 2025, 2025–2026. https://www.sec.gov/Archives/edgar/data/1599617/000119312526072828/dnow-20251231.htm; https://www.sec.gov/Archives/edgar/data/1020710/000162828026012382/dxpe-20251231.htm; https://www.sec.gov/Archives/edgar/data/703604/000119312526306263/d131211d8k.htm; https://www.sec.gov/Archives/edgar/data/945114/000162828026012945/gic-20251231.htm
18. EVI Industries, Inc., record fiscal 2025 results and subsequent quarterly reports (revenue ~$390 million; gross margin from ~23% in FY2019 past 30%; service and parts ~one-third of gross profit); Sally Beauty Holdings, Inc., Form 10-K FY2025 (revenue ~$3.72 billion; Beauty Systems Group ~43%); Cintas Corporation, Form 10-K FY2025 (revenue $10.34 billion; ~95% route servicing), 2025–2026. https://www.nasdaq.com/press-release/evi-industries-reports-record-fiscal-2025-results-fueled-strategic-acquisitions; https://www.sec.gov/Archives/edgar/data/1368458/000119312525280122/sbh-20250930.htm; https://www.sec.gov/Archives/edgar/data/723254/000072325425000017/ctas-20250531.htm
19. Imperial Brady (Imperial Dade + BradyPLUS merger completed March 2026, unified brand launched May 2026; ~$10 billion combined, 13,000-plus employees, 125-plus facilities); Imperial Dade, ninety-sixth acquisition announcement (January 2025); Sonepar, sale of Vallen North America to Nautic Partners (2025). https://www.businesswire.com/news/home/20260508673107/en/Imperial-Dade-and-BradyPLUS-Launch-Unified-Brand-Imperial-Brady; https://www.mdm.com/news/top-distributor-sectors/grocery-foodservice-distribution/imperial-dade-bradyplus-complete-jansan-megamerger/; https://www.imperialdade.com/news/imperial-dade-acquires-s-freedman-sons-inc-expands-across-mid-atlantic; https://www.sonepar.com/en/newsroom/sonepar-enters-into-an-agreement-to-sell-vallen-north-america-35010
20. AAR Corp., fiscal 2025 Form 10-K (Parts Supply segment $1.1 billion at 14.3% operating margin; $809 million inventory; slow-moving-inventory critical audit matter) and ADI acquisition (2025); VSE Corporation, full-year 2025 results and Form 10-K (pure-play aviation; aviation revenue >$1.1 billion; distribution +46%; $554 million inventory); HEICO Corporation, fiscal 2025 record results (net sales $4.485 billion; Flight Support ~$3.1 billion) and the ~$2.05 billion Wencor acquisition (2023), 2023–2026. https://www.sec.gov/Archives/edgar/data/1750/000141057825001475/air-20250531x10k.htm; https://www.aarcorp.com/en/newsroom/press-releases/2025/aar-acquires-leading-parts-distributor-adi-american-distributors/; https://www.businesswire.com/news/home/20260225618361/en/VSE-Corporation-Announces-Fourth-Quarter-and-Full-Year-2025-Results; https://www.sec.gov/Archives/edgar/data/102752/000010275226000015/vsec-20251231.htm; https://www.accessnewswire.com/newsroom/en/aerospace-and-defense/heico-corporation-reports-record-net-income-up-35-on-record-operating-income-1118837; https://www.clearygottlieb.com/news-and-insights/news-listing/warburg-pincus-to-sell-wencor-group-to-heico
21. Boeing Distribution Services, "About Us" (more than one million part numbers; 65-plus locations); FDH Aero, "FDH Aero Enters Partnership with Bain Capital and Audax Private Equity" (June 2026), 2025–2026. https://www.boeingdistribution.com/aero/about-us/idex.cfm; https://fdhaero.com/press-release/fdh-aero-enters-partnership-with-bain-capital-and-audax-private-equity/
22. Federal Aviation Administration: AC 00-56B Change 1, Voluntary Industry Distributor Accreditation Program; Parts Manufacturer Approval (PMA) guidance; Suspected Unapproved Parts program; and FAA Aerospace Forecasts FY2025–2045 (U.S. commercial fleet 7,387 in 2024 to 10,607 by 2045; large cargo jets 861 to 1,399), 2023–2025. https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_00-56B_CHG_1.pdf; https://www.faa.gov/aircraft/air_cert/design_approvals/pma/pma_des; https://www.faa.gov/aircraft/safety/programs/sups; https://www.faa.gov/data_research/aviation/aerospace_forecasts/FY-2025-2045-Full-Forecast-Document-and-Tables.pdf
23. Kevin Michaels / AeroDynamic Advisory, "Parts Distribution: The New MRO Battleground" (~$22 billion global parts-distribution market, ~80% tied to MRO); Modern Distribution Management, "Aircraft Parts Distributor Incora Files for Bankruptcy," 2023. https://www.linkedin.com/pulse/parts-distribution-new-mro-battleground-kevin-michaels; https://www.mdm.com/news/top-distributor-sectors/aerospace/aircraft-parts-distributor-incora-files-for-bankruptcy/
24. Farm Equipment magazine, 2024 "Big Dealer" Report (206 groups with five-plus ag locations, down from a 2022 peak of 214; ~39% of North American ag stores) and Farm Progress / AgriMarketing coverage of the largest North American dealer groups (United Ag & Turf, Ag-Pro, RDO Equipment location counts and revenue), 2024–2026. https://www.farm-equipment.com/articles/22441-big-dealer-consolidation-continues-in-2024; https://www.agrimarketing.com/s/153962
25. Federal Trade Commission, "FTC, States Secure Settlement with Deere & Company, Advancing Farmers' Right to Repair" (July 2026; ten-year obligations, dealer-equivalent repair access); U.S. PIRG / National Agricultural Law Center on the Colorado 2024 right-to-repair law, 2024–2026. https://www.ftc.gov/news-events/news/press-releases/2026/07/ftc-states-secure-settlement-deere-company-advancing-farmers-right-repair; https://pirg.org/resources/john-deere-and-right-to-repair-over-the-years/
26. Association of Equipment Manufacturers, U.S. Monthly Agricultural Equipment Sales Reports (December 2025 and May 2026 — tractors −9.9% to ~195,900 units and combines −35.6% to ~3,579 in 2025; tractors −12.4% and combines −14.6% year over year through May 2026); U.S. Department of Agriculture, Economic Research Service, Farm Sector Income Forecast (May 2026: 2026 net farm income $153.4 billion) and 2025 net farm income forecast with American Farm Bureau Federation commentary, 2025–2026. https://www.aem.org/getattachment/9ee3a193-4c55-4c47-8e3a-ec1237b41f09/US-Month-Ag-Report-2025-12.pdf; https://ers.usda.gov/topics/farm-economy/farm-sector-income-finances/farm-sector-income-forecast; https://www.fb.org/market-intel/farm-income-rebounds-livestock-gains-as-crops-fall
27. U.S. Census Bureau, Construction Spending, 2025 annual (total $2.1643 trillion; private $1.6475 trillion, down 2.9%; public $516.8 billion, up 3.6%; data-center growth); U.S. Geological Survey, Mineral Commodity Summaries 2026 (U.S. nonfuel mineral production $112 billion in 2025, up 6%); U.S. Department of Energy, critical-minerals funding announcement (nearly $1 billion, August 2025). https://www.census.gov/construction/c30/pdf/pr202512.pdf; https://pubs.usgs.gov/periodicals/mcs2026/mcs2026.pdf; https://www.energy.gov/articles/energy-department-announces-actions-secure-american-critical-minerals-and-materials-supply
28. Tariff impact: Deere & Co. Form 10-K (FY2025), AgWeb, Manufacturing Dive and Farm Progress coverage of the 50% steel and aluminum tariffs effective August 2025, OEM cost impacts (Deere ~$600 million in 2025 and ~$1.2 billion projected for fiscal 2026; CNH ~$120 million) and the June 2026 equipment-tariff reduction to 15%; National Association of Wholesaler-Distributors, NAW/MDM Tariff Survey (62% expect COGS +10%; 67% negative business impact; 48% slowing inventory replenishment), 2025–2026. https://www.agweb.com/news/machinery/new-machinery/what-farm-equipment-manufacturers-are-saying-about-50-steel-and-alum; https://www.naw.org/new-naw-research-shows-tariffs-growing-impact-on-supply-chain/
29. Manufacturing Dive / ISM and S&P Global / Distribution Strategy Group, U.S. Manufacturing PMI and tariff-uncertainty coverage, 2025–2026; Industrial Distribution, "A High Bar for Acquisitions" (industrial-distribution M&A activity down in 2025 amid tariff and macroeconomic uncertainty), 2025. https://www.manufacturingdive.com/news/ism-pmi-october-2025-us-production-deteriorates-despite-improved-demand/804522/; https://distributionstrategy.com/2026/04/u-s-manufacturing-pmi-hits-near-four-year-high-as-inventory-surge-masks-cost-pressures/; https://www.inddist.com/mergers-acquisitions/article/22954785/print-a-high-bar-for-acquisitions
30. Product and goods-handling regulation: OSHA Hazard Communication Standard final rule (effective July 19, 2024); U.S. EPA, Pesticide Establishment Registration and Reporting (FIFRA); U.S. FDA, Cosmetic Registration and Listing Guidance (MoCRA); U.S. FTC, "Complying with the Funeral Rule," 2024–2025. https://www.osha.gov/hazcom/rulemaking; https://www.epa.gov/compliance/pesticide-establishment-registration-and-reporting; https://www.fda.gov/cosmetics/registration-listing-cosmetic-product-facilities-and-products; https://www.ftc.gov/business-guidance/resources/complying-funeral-rule
31. U.S. Environmental Protection Agency, Regulations for Emissions from Heavy Equipment (Compression-Ignition) — Tier 4 nonroad diesel standards; U.S. Mine Safety and Health Administration, Approval and Certification Center (mining equipment approvals). https://www.epa.gov/regulations-emissions-vehicles-and-engines/regulations-emissions-heavy-equipment-compression; https://www.msha.gov/about/program-areas-offices/technical-support/technical-support/approval-and-certification-center
32. U.S. Small Business Administration, Table of Small Business Size Standards (250 employees for 423810; 125 for 423820, 423840 and 423850; 175 for 423860); U.S. Bureau of Labor Statistics, May 2023 Industry-Specific Occupational Employment and Wage Estimates for NAICS 423820 (24,770 farm-equipment mechanics and service technicians) and Current Employment Statistics series for NAICS 42384 and 42385, 2023–2026. https://www.sba.gov/document/support-table-size-standards; https://www.bls.gov/oes/2023/may/naics5_423820.htm; https://www.bls.gov/web/empsit/ceseeb1b.htm