Industrial Machinery and Equipment Merchant Wholesalers (U.S.)

NAICS 2022 code 42383 — a NAICS industry (5-digit) that equals its one child, 423830

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1. Overview

NAICS (North American Industry Classification System) code 42383 covers the independent distributors that buy industrial machinery, equipment, and parts from manufacturers and resell them to industrial end-users — adding technical advice, local inventory, and after-sale service.[1] These are the middlemen of the factory economy: the firms that source the pumps, bearings, gearboxes, valves, conveyors, machine tools, and robot arms that keep American factories, refineries, and warehouses running.

For an investor, this is a large, fragmented, cash-generative, and quietly essential slice of the U.S. supply chain — roughly $291 billion in annual sales across about 18,800 firms.[2][3] It is not glamorous, but the best operators compound value steadily by rolling up smaller distributors, and because demand tracks the whole industrial economy, the group is a clean read on U.S. manufacturing health.

This page is a short rollup. The 5-digit industry 42383 contains exactly one 6-digit child, 423830, and is therefore identical to it in scope, size, and economics. This page gives the level's own definition and ground-truth federal figures, then points you to the full child primer — 423830 — Industrial Machinery and Equipment Merchant Wholesalers — for the complete detail on the investable universe, unit economics, demand drivers, regulation, consolidation, risks, and how to invest.

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2. What's inside — and why this level equals its one child

NAICS is a nested hierarchy: each 5-digit industry breaks into one or more 6-digit national industries. When a 5-digit industry has only one 6-digit child, the two codes describe the same set of businesses — the split adds no further detail. That is the case here:

So 42383 and 423830 are effectively one and the same. Every establishment counted here is a merchant wholesaler — it takes title to (buys and owns) the machinery, then resells it, mostly to businesses rather than consumers.[1] The machinery in scope is that used in manufacturing, oil-well, and warehousing activity: fluid-power (hydraulic and pneumatic) equipment, metalworking and machine tools, food-processing machinery, oil-well machinery, and material-handling gear such as conveyors, cranes, and hoists, along with pumps, compressors, engines, valves, and welding equipment.[1]

The child primer covers what sits just outside this code — construction and mining machinery (423810), industrial supplies and MRO (maintenance, repair, and operations) consumables (423840), transportation, electrical, and farm-machinery wholesale codes, and manufacturers' captive distribution arms filed under manufacturing — and why those distinctions blur the "industry" as investors think of it.[1] The practical consequence for anyone reading company filings: because Census classifies each establishment by its primary activity while public companies report broader segments, a company-level revenue number cannot be treated as 423830 market share.[1] See 423830 §2 for that full boundary discussion.

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3. Size (this level's rollup figures)

Because 42383 has a single child, its rollup totals are the same federal figures reported for 423830. Ground-truth statistics for NAICS 42383 (United States):

Two federal vintages, not a contradiction. The headline sales line now comes from the 2023 Annual Integrated Economic Survey ($290.9 billion), which also splits the total between conventional merchant wholesalers and manufacturers' sales branches; the quinquennial 2022 Economic Census counted $282.3 billion on its own basis.[2][3] Use the AIES figure for current size and the Economic Census for firm counts and concentration, and do not read the gap as growth or as a discrepancy between sources.

Trend. On a consistent 2017-NAICS basis, firm and establishment counts fell from 22,773 firms and 29,871 establishments in 2017 to 18,795 firms and 25,700 establishments in 2022 — visible consolidation over that five-year window, even as sales grew.[5] Establishments per firm run about 1.4, so the population is still overwhelmingly single- or few-branch local businesses sitting beneath a small number of national distributors.[3][4]

Concentration. This is one of the more fragmented industries in the economy. The four largest firms captured just 8.3% of sales; the top 8, 13.2%; the top 20, 22.4%; the top 50, 31.7%.[6] The Herfindahl-Hirschman Index (HHI, a standard concentration gauge that runs to 10,000) was 34.7 — near the very bottom of the scale, meaning almost no single-firm dominance.[6] Even the largest player holds only low-single-digit national share.

The pay figure (~$91,800 per worker) sits well above a typical warehouse wage, reflecting technical outside-sales staff, application engineers, and service technicians rather than pure order-pickers.[4]

Undercount caveat. Federal wholesale statistics capture this industry reasonably well — it is dominated by employer firms with payroll and tax IDs, not by untracked micro-operators, so there is no large hidden tail. The distortion runs the other way: the industry as investors picture it is larger than the 42383 line alone, because NAICS classifies each establishment by its primary activity. Machinery-distribution revenue booked by diversified public distributors under a different primary code, and manufacturers' captive distribution arms filed under manufacturing, both fall outside this count. 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 mixes in supplies and electrical goods, and one that should be read as a research estimate rather than a federal count.[7] Treat 42383 as the clean federal core, not the outer edge of the opportunity set.

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4. Investable universe (where value concentrates)

Because 42383 is a single child, all of the investable exposure lives in 423830. There is no pure-play way to own the code as a whole and no dedicated index fund, but a handful of scaled distributors trade on U.S. exchanges and one industry giant sits inside a larger public parent. The listed names are Applied Industrial Technologies (NYSE: AIT, ~$4.6B fiscal 2025 revenue in bearings, power transmission, fluid power, and factory automation)[8], Motion (the industrial segment of Genuine Parts Company, NYSE: GPC, ~$8.9B segment sales in 2025 and the largest North American power-transmission distributor)[9], MSC Industrial Direct (NYSE: MSM, ~$3.8B in metalworking and machine-shop supply)[10], DXP Enterprises (NASDAQ: DXPE, ~$2.0B in pumps and rotating equipment)[11], DNOW (NYSE: DNOW, ~$2.5B pro forma in pipe, valves, fittings, and process equipment)[12], and Global Industrial Company (NYSE: GIC, ~$1.3B in material handling and broad-line industrial products)[13].

The listed set has changed materially since the last pass. DNOW completed its acquisition of MRC Global in November 2025, removing MRC as a separate public exposure and creating a larger energy/industrial platform.[12] Distribution Solutions Group (NASDAQ: DSGR, ~$2.0B of 2025 revenue) entered a definitive agreement in July 2026 to be taken private by affiliates of LKCM Headwater, so it is no longer a clean long-term public access point.[14][15] And Genuine Parts announced in February 2026 an intention to separate its industrial and automotive businesses, which would eventually leave Motion as a standalone industrial-distribution vehicle.[9] The net effect is fewer, larger listed ways in.

Adjacent broad-line MRO leaders W.W. Grainger (NYSE: GWW, ~$17.2B 2024 revenue) and Fastenal (NASDAQ: FAST, ~$7.55B) tilt toward supplies (NAICS 423840) but overlap heavily and remain the largest listed distributors.[16][17]

The bulk of the industry is private — thousands of family-owned and regional distributors plus private-equity buy-and-build platforms such as SunSource (fluid power; owned by Clayton, Dubilier & Rice since 2017) and OTC Industrial Technologies (a sponsor-backed multi-brand network in pumps, compressed air, automation, and power transmission that is actively consolidating the space).[18][19] For the full company table with revenue, market values, and focus areas — plus the major private owners — see 423830 §4.

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5. How the money works

The economics are the classic distributor model: buy from manufacturers, resell to industrial users at a markup, and earn a return on the working capital tied up in inventory and receivables. Gross margins run in the high-20s to low-30s percent; operating margins for the strongest scaled players run roughly 8–12%. The two public benchmarks bracket that range tightly: Applied Industrial Technologies posted a 30.3% gross margin and 10.9% operating margin in fiscal 2025, and Motion a 30.6% gross margin with a 12.9% segment EBITDA margin in 2025.[8][9]

The book splits between recurring MRO / break-fix demand (higher-margin, sticky, resilient) and project / capital-equipment demand (cyclical, lumpier, deferred first in a downturn). The model is capital-light in fixed assets but not in working capital: Applied 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.[8] Profitability therefore depends less on commodity direction than on the timing of price pass-through — inflation can lift nominal sales while squeezing margin, and deflation can reset selling prices before inventory cost follows.[8] The metrics that matter are organic daily sales growth, gross and incremental margin, inventory turns, return on invested capital (ROIC), and free cash flow — which tends to rise in a downturn as inventory is liquidated. Full detail, including the two-revenue-stream breakdown and the owner/investor metric list, is in 423830 §5.

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6. Demand drivers

Sales are a near-direct function of how hard American industry is running. The master gauges are the Federal Reserve's Industrial Production Index and capacity-utilization rate — which Genuine Parts identifies as the primary demand variables for Motion — and manufacturing sentiment via the ISM PMI (the Institute for Supply Management's Purchasing Managers' Index — above 50 signals factory expansion, below 50 contraction).[9][21][22] On top of the cycle sit several structural tailwinds: reshoring of U.S. manufacturing, factory automation and robotics adoption (industry group MHI points to continuing uptake of AI, machine learning, robotics, and both horizontal and vertical warehouse automation), oil-and-gas capital spending (a big swing factor for pump-heavy distributors such as DXP and DNOW), and warehouse and logistics buildout for e-commerce.[23] A quieter driver worth naming: technical outsourcing — as customers' skilled-labor constraints bite and plant equipment grows more sophisticated, the distributor's engineers and mechanics become an outsourced maintenance function rather than a reseller vulnerable to catalog substitution.[8] The recurring MRO base provides ballast when capex projects stall. See 423830 §6 for the full list.

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7. Regulation

Distribution is comparatively lightly regulated — there is no sector-specific federal regulator for machinery wholesalers and no licensing regime comparable to finance or health care. The exposure that matters is indirect: workplace safety (OSHA — the Occupational Safety and Health Administration, covering forklift, confined-space, and lockout/tagout risk in branches and fabrication shops), transportation and hazardous-materials rules (Department of Transportation), export controls and sanctions on machinery and oil-field equipment, product-liability and warranty risk as the seller of record, state equipment-dealer statutes governing OEM–dealer relationships, and — the live one — trade policy and tariffs. Section 232 (steel and aluminum) and Section 301 (China) tariffs raise the landed cost of imported machinery; distributors generally pass tariffs through, but face margin-timing risk and softer demand when buyers confront price uncertainty.[22] Full treatment in 423830 §7.

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8. Consolidation

The defining strategic fact — top-4 share of just 8.3% and an HHI of 34.7 — is a fragmented market that is slowly consolidating, and the 2017–2022 drop of roughly 4,000 firms is that process showing up in the federal data.[5][6] Scaled players grow largely by acquisition, buying regional and single-line distributors to add geography, product lines, and technical capability; landmark deals include Motion's $1.3 billion purchase of the Kaman Distribution Group (2017) and Clayton, Dubilier & Rice's buyout of SunSource (2017), and 2025's DNOW/MRC Global combination shows the same logic at the top of the market.[12][18][20]

Consolidation is not mechanically continuous, though. Trade press reported industrial-distribution deal activity down considerably in 2025 amid tariff and macroeconomic uncertainty — M&A velocity follows the cycle and financing conditions, so a roll-up thesis has to underwrite lumpy deal flow rather than a steady cadence.[24] Distributors defend margin through technical depth and service, breadth and scale, value-add fabrication, and e-commerce — against the twin disintermediation threats of OEMs selling direct and marketplaces (Amazon Business and the like) commoditizing catalog orders.[7] See 423830 §8.

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9. Risks

The principal risks are the same as the child's: cyclicality (demand tracks industrial production and capex, though cash flow holds up as inventory unwinds), end-market concentration (firms tied to oil and gas, such as DXP and DNOW, ride that boom-bust cycle), tariffs and input-cost inflation, disintermediation by OEM-direct and e-commerce, margin transparency from online price discovery, acquisition and integration risk on the roll-up strategy, and labor and succession pressure as the technical outside-sales and service workforce ages.[6][22] Two balance-sheet risks deserve equal billing in a working-capital business: inventory obsolescence when technology or supplier lines change, and credit losses on receivables, which rise in industrial downturns among smaller manufacturers and energy customers.

On tariffs, the sector-level evidence is a 2025 NAW/MDM survey of wholesale distributors in which 62% expected cost of goods sold to rise by at least 10%, 67% reported a negative business impact, and 48% were slowing inventory replenishment — responses across wholesale distribution generally, not statistics specific to this code, but indicative of the sensitivity.[25] Full discussion in 423830 §9.

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10. How to invest & outlook

Routes to exposure. The public-market path is direct ownership of the listed distributors (AIT, MSM, DXPE, DNOW, GIC) or Genuine Parts Company for its Motion segment — with the caveat that GPC's announced separation would eventually unbundle that exposure.[8][9][10][11][12][13] The broad-line MRO names (GWW, FAST) are the largest and highest-quality listed distributors but tilt toward supplies.[16][17] There is no dedicated ETF, so these names appear inside broad industrials and capital-goods index funds. Because 90%-plus of the industry is private, the larger opportunity set is off-exchange — acquiring or building a regional distributor, or backing a private-equity buy-and-build platform; the extreme fragmentation (HHI 34.7, top-4 share 8.3%) is precisely the attraction.[6] The child primer names the underwriting traps worth memorizing: treating gross sales as value added, understating inventory and receivables funding, assuming every price increase protects margin, and paying a technology multiple for a cyclical, working-capital-intensive distribution business. Tickers, market values, and yields are the appropriate lens only in this investable-universe context; in the operating business itself, think in the distributor economics of Section 5.

Outlook. Near term, results follow the manufacturing cycle — ISM PMI, industrial production, and tariff-driven pricing uncertainty are the swing factors, with the recurring MRO base as ballast.[21][22] Structurally, reshoring, automation, and heavy build-out of data centers, electrical infrastructure, and logistics all enlarge the installed equipment base these distributors sell and service, and the fragmentation that defines the industry makes consolidation a durable engine of value creation — episodic in timing, but unlikely to resolve quickly. This is a slow-and-steady cash compounder, not a hyper-growth story.

For the complete treatment of every section above, see the child primer: 423830 — Industrial Machinery and Equipment Merchant Wholesalers.

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Sources

1. U.S. Census Bureau / NAICS Association, "NAICS 423830 — Industrial Machinery and Equipment Merchant Wholesalers (2022 definition, illustrative examples, and cross-references)," 2022. https://data.census.gov/profile/423830_-_Industrial_Machinery_and_Equipment_Merchant_Wholesalers?codeset=naics~423830
2. U.S. Census Bureau, "2023 Annual Integrated Economic Survey — Inventory and Sales (NAICS 423830): employer-firm sales $290.857 billion; merchant wholesalers $227.110 billion; manufacturers' sales branches $63.747 billion; year-end inventories $46.771 billion," 2023. https://data.census.gov/table/AIESINVTIMESERIES.AIES00INV?codeset=naics~423830&g=010XX00US
3. U.S. Census Bureau, "2022 Economic Census — Concentration by Largest Firms (NAICS 423830): receipts $282,320,837 thousand; 18,795 firms," 2022. https://www.census.gov/programs-surveys/economic-census.html
4. U.S. Census Bureau, "County Business Patterns 2023 (NAICS 423830): 25,949 establishments; 374,989 employees; $34,437,110 thousand annual payroll," 2023. https://www.census.gov/programs-surveys/cbp.html
5. U.S. Census Bureau, "2017–2022 Comparative Economic Census (NAICS 423830): 22,773 firms / 29,871 establishments in 2017 vs. 18,795 firms / 25,700 establishments in 2022," 2022. https://data.census.gov/table/ECNCOMP2022.EC2200COMP?codeset=naics~423830&g=010XX00US
6. U.S. Census Bureau, "2022 Economic Census — Concentration Ratios and HHI (NAICS 423830): CR4 8.3%, CR8 13.2%, CR20 22.4%, CR50 31.7%, HHI 34.7," 2022. https://www.census.gov/programs-surveys/economic-census.html
7. GlobeNewswire / Dimension Market Research and Statifacts, "U.S. / Global Industrial Distribution Market Size (machinery & equipment ~32% of a ~$2.9 trillion U.S. market; e-commerce fastest-growing channel)," 2024–2025. https://www.globenewswire.com/news-release/2024/12/09/2993778/0/en/Industrial-Distribution-Market-Is-Expected-To-Reach-Revenue-Of-USD-12-975-Bn-By-2033-At-5-3-CAGR-Dimension-Market-Research.html
8. Applied Industrial Technologies, Inc., "Fiscal 2025 Form 10-K (revenue $4.563B; gross margin 30.3%; operating margin 10.9%; inventory $505M; receivables $770M; inventory turns 4.3x; DSO 56.6 days; capex $27.2M)," 2025. https://www.sec.gov/Archives/edgar/data/109563/000010956325000080/ait-20250630.htm
9. Genuine Parts Company, "2025 Form 10-K (Industrial/Motion segment sales ~$8.9B worldwide, ~$8.4B North America; gross margin 30.6%; segment EBITDA margin 12.9%; planned separation of Industrial and Automotive segments)," 2025. https://www.sec.gov/Archives/edgar/data/40987/000004098726000003/gpc-20251231.htm
10. MSC Industrial Direct Co., Inc., "Fiscal 2024 Fourth Quarter and Full-Year Results (net sales $3.82 billion, down 4.7%)," 2024. https://www.sec.gov/Archives/edgar/data/1003078/000100307824000103/pressreleaseq410242024.htm
11. DXP Enterprises, Inc., "2025 Form 10-K (revenue $2.016 billion; pumps, rotating equipment, bearings, power transmission, safety products, supply-chain and pumping solutions)," 2025. https://www.sec.gov/Archives/edgar/data/1020710/000162828026012382/dxpe-20251231.htm
12. DNOW Inc., "2025 Form 10-K (pipe, valves, fittings, pumps, process equipment; MRC Global acquisition completed November 2025)," 2025. https://www.sec.gov/Archives/edgar/data/1599617/000119312526072828/dnow-20251231.htm
13. Stock Analysis / CompaniesMarketCap, "Global Industrial Company (GIC) revenue ~$1.31B (2024) and market capitalization ~$1.26B (2026); formerly Systemax," 2024–2026. https://stockanalysis.com/stocks/gic/revenue/
14. Distribution Solutions Group, Inc., "2025 Form 10-K (revenue $1.980 billion)," 2025. https://www.sec.gov/Archives/edgar/data/703604/000070360426000008/dsgr-20251231.htm
15. Distribution Solutions Group, Inc., "Form 8-K — Definitive Agreement to be Acquired by LKCM Headwater (July 2026)," 2026. https://www.sec.gov/Archives/edgar/data/703604/000119312526306263/d131211d8k.htm
16. Grainger (W.W. Grainger, Inc.), "Results for the Fourth Quarter and Full Year 2024 (sales $17.2 billion, up 4.2%)," Feb 2025. https://www.prnewswire.com/news-releases/grainger-reports-results-for-the-fourth-quarter-and-full-year-2024-302364936.html
17. Fastenal Company, "2024 Annual and Fourth Quarter Earnings (net sales $7.55 billion, up 2.7%)," Jan 2025. https://investor.fastenal.com/news-releases/news-details/2025/Fastenal-Company-Reports-2024-Annual-and-Fourth-Quarter-Earnings/default.aspx
18. Clayton, Dubilier & Rice / Automate.org, "Clayton, Dubilier & Rice to Acquire SunSource (fluid-power distributor; 200,000+ SKUs)," 2017. https://www.automate.org/news/clayton-dubilier-and-rice-to-acquire-sunsource
19. OTC Industrial Technologies, "About Us (multi-brand network: pumps, compressed air, automation, power transmission, process equipment, repair, engineered solutions)," 2026. https://otcindustrial.com/about-us
20. Littlejohn & Co. / Genuine Parts (Motion Industries), "Littlejohn Announces Sale of Kaman Distribution Group for $1.3 Billion to Motion Industries," 2017. https://markets.financialcontent.com/lethbridgeherald.com/article/bizwire-2021-12-16-littlejohn-and-co-announces-sale-of-kaman-distribution-group-for-13-billion
21. S&P Global / Distribution Strategy Group, "U.S. Manufacturing PMI (expansion/contraction readings, 2025–2026)," 2026. https://distributionstrategy.com/2026/04/u-s-manufacturing-pmi-hits-near-four-year-high-as-inventory-surge-masks-cost-pressures/
22. Manufacturing Dive / ISM, "U.S. Manufacturing PMI and Tariff Uncertainty (late 2025 contraction; sentiment improvement into 2026)," 2025–2026. https://www.manufacturingdive.com/news/ism-pmi-october-2025-us-production-deteriorates-despite-improved-demand/804522/
23. MHI, "Warehouse Automation Technology Trends (AI, machine learning, robotics, horizontal and vertical automation adoption)," 2026. https://www.mhi.org/blog/66401/technology-trends
24. Industrial Distribution, "A High Bar for Acquisitions (M&A activity down in 2025 amid tariff and macroeconomic uncertainty)," 2025. https://www.inddist.com/mergers-acquisitions/article/22954785/print-a-high-bar-for-acquisitions
25. National Association of Wholesaler-Distributors, "NAW/MDM Tariff Survey (62% expect COGS +10%; 67% negative business impact; 48% slowing inventory replenishment)," 2025. https://www.naw.org/new-naw-research-shows-tariffs-growing-impact-on-supply-chain/