Other Construction Material Merchant Wholesalers (U.S.)

NAICS 2022 — 42339 · A Histometrics industry primer (rollup level)

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Short page — single-child pass-through. In the North American Industry Classification System (NAICS, the U.S. government's standard for grouping businesses), the five-digit industry 42339 contains exactly one six-digit child, 423390, of the same name. At this level the rollup is the child: the same firms, the same sales, the same economics. This page gives the level's own definition and ground-truth federal figures, then points you to the full 423390 primer for the detail (investable names, margins, demand drivers, regulation, risks).

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1. Overview

NAICS 42339 is the "everything else" aisle of the building-materials warehouse. It covers merchant wholesalers — companies that buy construction products from manufacturers, hold them in stock, and resell to contractors, dealers, and builders — for the specialty materials that don't fit the big named wholesale categories: flat glass and glazing, metal (non-wood) fencing and ornamental ironwork, prefabricated metal buildings, steel wall-framing and acoustical ceilings, storage bins, and the wholesale side of manufactured (mobile) homes.[1]

A merchant wholesaler takes title to the goods (it owns the inventory and bears price and obsolescence risk), which separates it from a manufacturer's sales branch or a broker; commission agents and brokers that never take title sit in subsector 425 instead.[2] The economics are classic distribution — thin margins, high volume, lots of cash tied up in inventory and receivables, and profit that comes from logistics and buying power rather than from making anything.[3] For an investor the appeal is that distribution is the toll booth between factories and job sites: unglamorous but cash-generative, and one of the most actively consolidated corners of the U.S. building economy, with more than $60 billion of merger-and-acquisition capital flowing into building-products distribution since 2024.[4][5] The catch, spelled out below, is that almost none of that deal money lands inside this code.

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

Under 42339 there is a single detailed industry:

Because there is only one child, the five-digit rollup and the six-digit industry are the same population of firms — the extra digit adds no further breakout. Everything true of 423390 is true of 42339.

Three things are worth remembering from the child definition. First, the scope splits into two buckets: wholesale distribution of manufactured homes and prefabricated (non-wood) buildings, and wholesale distribution of construction materials not classified elsewhere.[1] Second, this code is defined by subtraction: the building materials that have their own codes are carved out — lumber and millwork (NAICS 423310), brick/stone/cement (423320), roofing/siding/insulation (423330), electrical supplies (423610), metal service-center steel (423510), and ready-mix concrete, which is manufacturing (327320). So a company that "distributes building products" is usually not here; 42339 is the residual specialty bucket.[1] Third, ownership is overwhelmingly private — independent family businesses and regional chains, with a growing share held by private-equity platforms — which is why the code is fragmented and hard to pin to a single stock. Note too that the manufactured-home slice of this code is thinner than the name suggests: most manufactured-home commerce is captured by manufacturing (NAICS 321991) and retail dealers (NAICS 453930), not wholesale. (Full scope, exclusion table, and ownership map are in the 423390 primer, Sections 2 and 4.)

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3. Size (this level's rollup figures)

Federal statistics for NAICS 42339 (our ingested ground-truth figures; identical to 423390 because the level has one child):

• Sales / receipts: the federal sources do not agree, and the gap is definitional rather than an error — the 2022 Wholesale Trade gross-margin table reports ~$33.8 billion of sales for merchant wholesalers excluding manufacturers' sales branches, while the broader 2022 Economic Census receipts figure is ~$38.8 billion.[6][7] Use the narrower figure when you want margin math on the same base, the broader one for headline size.
• Firms: 2,954 (2022).[7]
• Establishments (physical locations): 3,756 (2023 County Business Patterns); 3,760 on the 2022 gross-margin table — effectively the same count from two vintages.[6][8]
• Employment: 51,293 workers (2023).[8]
• Annual payroll: ~$3.95 billion (2023), implying roughly $77,000 average pay per worker.[8]

For scale, IBISWorld estimates the category at roughly $49.9 billion of revenue in 2026, above both 2022 Census figures largely because of price inflation in glass, steel, and building materials.[9]

Undercount / caveat. These are employer-firm statistics and are reasonably complete — this is not a government- or gig-dominated activity with a large "invisible" cottage tier. Two honest wrinkles beyond the receipts spread above: (1) because 42339 is a residual "not-elsewhere-classified" bucket, some firms selling these exact products are classified under a neighboring wholesale code (or under manufacturing when the maker sells direct), so the real product economy is larger than the code; and (2) receipts are 2022 while employment and establishment counts are 2023 — a small timing gap. The Herfindahl-Hirschman Index (HHI, the standard market-concentration measure) is suppressed for this code, so we do not state it.[7]

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4. Investable universe (where value concentrates)

With one child, value concentrates exactly where it does in 423390. In short: there is no U.S.-listed pure-play. The businesses that sit squarely inside the code are private, and the child's revised name list makes that texture clearer than the old parent did — Master Halco (70+ locations) and Merchants Metals in fencing; Oldcastle BuildingEnvelope in architectural glass, sold by CRH to private-equity firm KPS Capital Partners for ~$3.8 billion in 2022; General Glass International, American Insulated Glass, and Flat Glass Distributors among specialty flat-glass wholesalers; ABC Supply Interiors (formerly L&W Supply, 270+ locations in wallboard, ceilings, steel framing and insulation); and White Cap, whose 2020 combination with Construction Supply Group created a $4 billion, 400-plus-location specialty-construction distributor straddling 42339 and adjacent codes.[10][11][12][13][14]

Public exposure is indirect and splits two ways:

• Diversified distribution roll-ups that carry some of these products alongside broader lines — QXO, Inc. (NYSE: QXO, ~$18 billion of combined 2025 revenue after Beacon/Kodiak/TopBuild), The Home Depot (NYSE: HD, via SRS and GMS, acquired September 2025 for ~$5.5 billion of enterprise value), Lowe's (NYSE: LOW, via Foundation Building Materials — 370+ locations and ~$6.5 billion of 2024 pro forma revenue, acquired October 2025 for $8.8 billion), and Builders FirstSource (NYSE: BLDR, mostly lumber).[15][16][17][18][19]
• Upstream manufacturers whose goods flow across these warehouse floors — Champion Homes (NYSE: SKY, ~$2.5 billion FY2025 net sales), Cavco Industries (NASDAQ: CVCO), Legacy Housing (NASDAQ: LEGH) in manufactured homes; Nucor (NYSE: NUE) in pre-engineered metal buildings; Gibraltar Industries (NASDAQ: ROCK) in fencing and residential products. Clayton Homes, the largest manufactured-home producer, sits inside Berkshire Hathaway (NYSE: BRK.A/BRK.B) rather than trading separately.[20][21][22]

The most useful public yardstick for the code was GMS before Home Depot took it private: $5.514 billion of fiscal 2025 sales across more than 320 distribution centers, split into $2.198 billion of wallboard, $1.726 billion of complementary products, $796 million of steel framing, and $793 million of ceilings — a basket only partly consistent with 42339, since insulation and lumber fall elsewhere.[16]

In every case 42339 products are a minority of what you buy. One methodological caution the child now makes explicit: NAICS classifies establishments by primary activity while large distributors sell across several codes, so company-wide revenue cannot legitimately be divided into Census industry sales to manufacture a market share. The full name-by-name breakdown, with scale and the specific 42339 touchpoint for each, is in the 423390 primer, Section 4.

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5. How the money works

Owners make money on spread, velocity, and buying power, not on manufacturing. On gross margin the evidence points in slightly different directions and is worth holding side by side: the 2022 Census wholesale gross-margin table puts the code's own rate at 36.2% on own-account sales ($33.8 billion of sales less $22.0 billion of cost of goods sold, or $12.2 billion of gross margin), general distribution benchmarks describe a 20–40% markup band, and GMS — the closest recent listed comparator — earned 31.2% in fiscal 2025, down from 32.3%.[6][3][16] What all three agree on is what happens below that line: after warehouse, delivery, sales, and overhead the business nets to a low-to-mid single-digit operating margin. GMS carried SG&A of 22.9% of sales, adjusted EBITDA of $500.9 million (9.1%), and net income of $115.5 million (~2.1%).[16]

The real engine is inventory turnover: the best operators turn stock 4–6 times a year while weaker ones sit near 3, and a faster-turning distributor can out-earn a higher-margin, slower one on return on capital because less cash is frozen in the warehouse.[3] Working capital is the balance-sheet story — the code carried $3.4 billion of beginning and $3.9 billion of ending inventory against $21.6 billion of purchases in 2022, on top of contractor receivables at 30–60 day terms.[6] Reliable in-stock availability plus jobsite delivery is the local moat. Metrics to watch: gross margin %, inventory turns, days sales outstanding (DSO), organic (same-branch) sales growth, and EBITDA margin — plus the commodity cost of steel, aluminum, and glass, which swings both revenue and inventory value. Price-cost timing cuts both ways: GMS blamed its margin decline on weak demand, unfavorable price-cost dynamics, and lower vendor-incentive income as purchase volumes fell.[16] (Detail in 423390, Section 5.)

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6. Demand drivers

Demand is a derivative of construction activity and highly cyclical. Total U.S. construction put-in-place ran ~$2.19 trillion in 2024 and eased about 1.4% to ~$2.16 trillion in 2025, with the nonresidential component at ~$766 billion and ~$742 billion respectively — and big divergence by segment beneath those totals.[23] Residential building and remodeling drive fencing, glass replacement, and interior products, and are rate-sensitive (high mortgage rates cool housing starts). The current bright spot is nonresidential mega-projects — data centers, reshoring factories, and warehouses — which consume pre-engineered metal buildings, curtain-wall glazing, perimeter fencing, and steel framing in volume. Manufactured housing carries a durable affordability tailwind: HUD-code production rose ~16% in 2024 to roughly 96,200 homes at an average sales price near $123,300, about a third of a comparable site-built home — though the wholesale slice of that activity is small.[24][25] Weather matters at the margin: storms drive replacement demand for fencing and glass, while cold or wet spells delay jobs, which is why distributors' calendars are seasonal.[16] Finally, because distributors resell commodities, higher steel/aluminum/glass prices lift reported revenue even without more units sold — and falling prices can shrink it. (Full treatment in 423390, Section 6.)

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7. Regulation

Wholesalers face relatively light product regulation themselves — their main load is standard commercial, warehouse-safety (OSHA — Occupational Safety and Health Administration), and delivery/motor-carrier (DOT — Department of Transportation) rules. But the products they move carry federal standards that shape the stock mix: safety glazing in hazardous locations must meet the Consumer Product Safety Commission's 16 CFR Part 1201 (effectively tempered or laminated glass, referenced against ANSI Z97.1), and manufactured homes must be built to the federal HUD Code (24 CFR Part 3280), which preempts local building codes and requires a certification label on each home.[26][27] Local adoption of the International Building and Residential Codes and of energy codes sets glazing performance and framing requirements, steering specifications — and creating inventory-obsolescence and training costs when they tighten. Trade policy is a live cost factor: Section 232 tariffs on imported steel and aluminum, plus duties on some imported glass, raise landed costs on fencing, metal buildings, framing, and glass, a risk GMS flagged explicitly alongside its product-liability, warranty, construction-defect, and vehicle-accident exposure.[16] (Detail in 423390, Section 7.)

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8. Consolidation

The federal concentration data confirm how fragmented the code is: the top 4 firms hold just 22.9% of revenue, the top 8 31.2%, the top 20 39.8%, and the top 50 only 49% — meaning half the market sits with firms outside the fifty largest.[7] Competition is won locally on stock availability, delivery speed, credit terms, and relationships. Building-products distribution overall — a roughly $800 billion North American market served by more than 7,000 distributors — is being rolled up at unprecedented scale: Home Depot bought SRS Distribution for $18.25 billion in 2024 and added GMS for ~$5.5 billion in September 2025; Lowe's entered specialty pro distribution with Foundation Building Materials for $8.8 billion in October 2025; and QXO acquired Beacon Roofing (~$11 billion), Kodiak (~$2.25 billion), and TopBuild (~$17 billion) while targeting ~$50 billion of revenue this decade.[28][4][17][19][15] That megadeal activity is centered on adjacent codes (roofing, drywall, insulation); within 42339 proper, consolidation is quieter and niche-specific — Master Halco in fencing, Oldcastle BuildingEnvelope and General Glass International in glass — with private equity the typical consolidator.[10][11] Digital tools are reshaping order capture (discovery, estimating, inventory visibility) more than physical fulfillment, since bulky and specified materials still need local stock, credit, and coordinated delivery. The strategic threat to independents is real either way. (Full deal list in 423390, Section 8.)

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9. Risks

The risk profile is exactly the child's: cyclicality (revenue tracks construction and interest rates); commodity and tariff cost volatility (steel, aluminum, glass prices swing margins and inventory values); inventory / price-deflation risk (write-downs on stock bought high, obsolescence on slow movers); working-capital and credit risk (heavy contractor receivables; a wave of defaults in a downturn is a classic distributor failure mode); consolidation squeeze (scaled national buyers erode independents' pricing and purchasing power, and consolidated customers press margins from the other side); labor, immigration, and freight costs on a thin operating margin — GMS named immigration policy as a constraint on both its own workforce and its customers'; substitution / channel shift (product-mix changes such as composite versus metal fencing, and manufacturers selling direct); and regulatory and liability exposure (code changes, product-liability, warranty, construction-defect, and vehicle claims).[16] See 423390, Section 9.

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10. How to invest & outlook

Because 42339 equals 423390, the playbook is identical. Publicly, no pure-play exists, so investors approximate the exposure through distribution roll-ups (QXO, Home Depot via SRS/GMS, Lowe's via FBM, Builders FirstSource) or upstream manufacturers (Champion Homes, Cavco, Legacy Housing, Nucor, Gibraltar) — accepting that these products are a minority of the mix.[15][16][20] Privately, this is where the code actually lives: acquiring or building a platform of regional specialty distributors (fencing, glass, prefab buildings), private-equity roll-ups (the KPS/Oldcastle template), and owning the distribution-yard real estate alongside the operating business.[11] Diligence in this niche turns on local market share, customer and supplier concentration, gross margin by SKU, delivery density, inventory turns, rebate dependence, receivable aging, and how much of the franchise walks out the door with the owner-salesperson.

Outlook. Near-term demand looks mixed — total construction is flat-to-soft, and housing stays rate-sensitive — but nonresidential mega-projects (data centers, reshoring factories, warehouses) should support metal buildings, glazing, steel framing, and security fencing, and manufactured housing has a durable affordability tailwind. The dominant structural theme is consolidation: expect the roll-ups to keep buying, independents to keep selling, and the buying-power gap to widen. Key swing factors: interest rates (housing-linked demand) and steel/aluminum/glass tariffs and prices (margins and inventory values). These are directional judgments, not guarantees.

→ For the full detail — name-by-name investable universe, margin mechanics, demand and regulation deep-dives, the consolidation map, and the complete risk register — see the 423390 primer.

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Sources

1. NAICS Association. "NAICS Code 423390 — Other Construction Material Merchant Wholesalers (Definition, Illustrative Examples, Cross-References)." 2022. https://www.naics.com/naics-code-description/?code=423390
2. U.S. Census Bureau. "NAICS Sector 42 — Wholesale Trade (Description)." 2022. https://www.census.gov/naics/?details=42&input=42&year=2022
3. Pryse / Vendavo. "Distributor Margins and Markups Explained: Benchmarks by Industry." 2024. https://pryse.ai/blog/distributor-margins; https://vendavo.com/pricing/distributor-supplier-markups-explained
4. Modern Distribution Management. "QXO Set to Land TopBuild in $17B Deal…" and MDM/HousingWire coverage of Home Depot–SRS/GMS and Lowe's–FBM deals. 2025. https://www.mdm.com/news/top-distributor-sectors/building-materials-construction/qxo-set-to-land-topbuild-in-17b-deal-to-reshape-building-materials-distribution/
5. Zelman & Associates. "Beyond Consolidation: The Evolving M&A Playbook in Building Products Distribution." 2026. https://www.zelmanassociates.com/resources/zelman-insights/2026-04/beyond-consolidation-the-evolving-m-a-playbook-in
6. U.S. Census Bureau. 2022 Wholesale Trade Gross Margin table — NAICS 42339/423390 (3,760 establishments; $33.817B sales; $22.038B COGS; $12.229B gross margin; 36.2% gross-margin rate; $3.439B beginning inventory; $3.916B ending inventory; $21.562B purchases). 2022. https://data.census.gov/table/ECNGRMARGPROF2022.EC2242GRMARGPROF
7. U.S. Census Bureau. 2022 Economic Census — Concentration & receipts, NAICS 42339/423390 (receipts ~$38.8B; 2,954 firms; CR4 22.9%, CR8 31.2%, CR20 39.8%, CR50 49%; HHI suppressed). 2022. https://www.census.gov/programs-surveys/economic-census.html
8. U.S. Census Bureau. County Business Patterns 2023 — NAICS 42339/423390 (3,756 establishments; 51,293 employees; annual payroll ~$3.95B). 2023. https://www.census.gov/programs-surveys/cbp.html
9. IBISWorld. "NAICS Code 423390 — Other Construction Material Merchant Wholesalers" (revenue estimate ~$49.9B, 2026). https://www.ibisworld.com/classifications/naics/423390/other-construction-material-merchant-wholesalers/
10. Master Halco. "Your Leading Wholesale Fencing Distributor" (70+ locations); Merchants Metals fence systems. 2026. https://www.masterhalco.com/
11. Oldcastle BuildingEnvelope / KPS Capital Partners. "KPS to Acquire Oldcastle BuildingEnvelope from CRH plc" (~$3.8B, 2022). https://www.kpsfund.com/news/press-releases/2022/02/28/kps-capital-partners-to-acquire-oldcastle-buildingenvelope-inc.-from-crh-plc
12. General Glass International / American Insulated Glass / Flat Glass Distributors — private flat-glass wholesalers/fabricators (company sites). 2026. https://www.generalglass.com/
13. ABC Supply. "Fact Sheet" (ABC Supply Interiors, formerly L&W Supply; 270+ locations; wallboard, ceilings, steel framing, insulation). 2026. https://www.abcsupply.com/media-center/fact-sheet/
14. White Cap. "White Cap and Construction Supply Group Combine to Create $4 Billion Market-Leading Distributor" (400+ locations; 2020). https://about.whitecap.com/2020-10-19-white-cap-and-construction-supply-group-combine-to-create-4-billion-market-leading-distributor-of-concrete-accessories-and-specialty-construction-products
15. QXO, Inc. Form 10-K / annual report and Modern Distribution Management coverage (~$18.1B combined 2025 revenue post-Beacon/Kodiak/TopBuild). 2025–2026. https://www.sec.gov/Archives/edgar/data/1236275/000162828026012601/qxo-20251231.htm
16. GMS Inc. Form 10-K, FY2025 ($5.514B sales; $2.198B wallboard, $1.726B complementary products, $796M steel framing, $793M ceilings; 320+ distribution centers; 31.2% gross margin; $500.9M adjusted EBITDA / 9.1%; $115.5M net income / ~2.1%; 22.9% SG&A). 2025. https://www.sec.gov/Archives/edgar/data/1600438/000162828025032103/gms-20250430.htm
17. The Home Depot. "Home Depot Completes Acquisition of GMS" (September 2025; ~$5.5B enterprise value). https://ir.homedepot.com/news-releases/2025/09-04-2025-133535262
18. Lowe's Companies, Inc. SEC Filing — Foundation Building Materials acquisition announcement (370+ locations; ~40,000 professional customers; ~$6.5B 2024 pro forma revenue; $635M adjusted EBITDA). 2025. https://www.sec.gov/Archives/edgar/data/60667/000006066725000162/exhibit991-08012025fbm.htm
19. Lowe's Companies, Inc. "Lowe's Completes Acquisition of Foundation Building Materials" (October 2025; $8.8B cash). https://www.sec.gov/Archives/edgar/data/60667/000006066725000199/exhibit991-10092025.htm
20. Champion Homes, Inc. (fka Skyline Champion). Form 10-K, FY2025 (~$2.5B net sales; #2 U.S. manufactured housing; Clayton Homes = Berkshire Hathaway). 2025. https://www.sec.gov/Archives/edgar/data/90896/000095017025077746/sky-20250329.htm
21. Cavco Industries (CVCO) and Legacy Housing (LEGH) — SEC filings / company profiles. 2025. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=cvco
22. Nucor Buildings Group. "Metal Building Systems" (pre-engineered metal buildings; 200,000+ projects). 2026. https://nucor.com/products/metal-buildings/
23. U.S. Census Bureau. "Monthly Construction Spending" (value of construction put in place: ~$2.19T in 2024, ~$2.16T in 2025; nonresidential ~$766B/$742B). 2024–2026. https://www.census.gov/construction/c30/current/index.html
24. Manufactured Housing Association for Regulatory Reform / MHProNews. "2024 HUD-Code Manufactured Home Production ~96,200 homes (+16%)." 2025. https://manufacturedhousingassociationregulatoryreform.org/category/manufactured-home-shipments/
25. U.S. Census Bureau / HUD Manufactured Housing Survey (via FRED, series SPTNSAUS). "Average Sales Price of New Manufactured Homes ~$123,300 (2024)." 2024. https://fred.stlouisfed.org/series/SPTNSAUS
26. U.S. Consumer Product Safety Commission. "Safety Standard for Architectural Glazing Materials, 16 CFR Part 1201." https://www.ecfr.gov/current/title-16/chapter-II/subchapter-B/part-1201
27. U.S. Department of Housing and Urban Development. "Manufactured Home Construction and Safety Standards (HUD Code), 24 CFR Part 3280." https://www.ecfr.gov/current/title-24/subtitle-B/chapter-XX/part-3280
28. McKinsey & Company. "Building materials: Understanding the keys to outperformance" (building-products distribution ~$800B; 7,000+ North American distributors). 2024. https://www.mckinsey.com/industries/engineering-construction-and-building-materials/our-insights/building-materials-understanding-the-keys-to-outperformance