Other Communication and Energy Wire Manufacturing (NAICS 335929): An Investor's Primer

1. Overview

This industry makes the insulated copper and aluminum wire and cable that moves electricity and signals through buildings, factories, power grids, and communication networks. Think of the wire behind your walls, the armored cable feeding a data center, the utility cable running down a distribution pole, and the coaxial cable carrying a video signal. The metal conductor is usually bought in from someone else; the work here is drawing, stranding, insulating, jacketing, and reeling it into finished cable [4].

Why an investor cares: this is a picks-and-shovels supplier to nearly every electrification trend at once — construction, grid rebuilds, data centers, electric vehicles, and renewables. Demand is broad and, in the current cycle, growing. But it is also a commodity-converter business: profits ride on the spread between the price a maker charges per pound of finished wire and the cost of the raw copper or aluminum it buys, so earnings can swing hard with metal prices [14][20].

Ways in differ from most sectors. The largest U.S. producer, Southwire, is private [11]. The last U.S.-listed pure play, Encore Wire, was bought by Italy's Prysmian in 2024 [5][6]. So public-market investors mostly reach this industry through large diversified or foreign-listed cable and connector companies, while private investors meet it directly as family- and sponsor-owned manufacturers.

2. What it is and how it's structured

Scope. NAICS 335929 covers establishments "primarily engaged in manufacturing insulated wire and cable of nonferrous metals from purchased wire" [4]. In plain terms: taking bought copper or aluminum wire and turning it into finished insulated products — building wire (such as THHN, the common insulated building conductor), metal-clad (MC) cable, power and control cable, utility distribution cable, electronic and coaxial communications cable, and armored cable [4].

The manufacturing process. Production is a continuous, capital-intensive conversion process. Purchased conductor wire is stranded or cabled, passed through extrusion lines that apply PVC, polyethylene, cross-linked polyethylene or similar insulation, cooled or cured, and sometimes jacketed or armored. Finished cable is electrically and dimensionally tested, cut to length and packaged on coils, reels or in contractor-oriented pulling systems. Typical process elements include wire preheating, controlled tension, crosshead extrusion dies, color concentrate and tandem PVC-insulation/nylon-jacketing lines [21]. Plants compete on conversion cost, line speed and uptime, scrap recovery, quality certification, breadth of available stock-keeping units, order-fill rate and freight distance.

What it explicitly excludes (and where those activities sit instead):

• Fiber-optic cable — its own code, NAICS 335921. Despite sitting in the same family, glass-fiber cable is not counted here [4].
• Plants that both draw and insulate copper in the same establishment — classified as copper rolling/drawing, NAICS 331420. This is a large carve-out (see the undercount note below) [4].
• Plants that both draw and insulate aluminum — NAICS 331318 [4].
• Drawing other nonferrous wire (not copper or aluminum) — NAICS 331491 [4].
• Cable assemblies with connectors for electronics — NAICS 334419; and extension/appliance cords — NAICS 335999 [4].
• Fabricated wire products (springs, mesh, fasteners) from purchased wire — NAICS 332618 [4].

Ownership mix. A concentrated top tier of large manufacturers — several foreign-owned — sits above a long tail of smaller specialty and regional producers. Public ownership is limited; much of the domestic base is privately or corporate-parent held (Southwire is private; Cerrowire belongs to Berkshire Hathaway's Marmon; Superior Essex belongs to Korea's LS Cable) [11][12][13].

3. How big it is

Our federal figures for NAICS 335929:

• Shipments/receipts: about $10.0 billion (2022 Economic Census) [1].
• Firms: 169; establishments: 212 [1][2].
• Employment: 15,936 workers; annual payroll: about $1.17 billion (2023) [2].
• Concentration: the top 4 firms make 48.3% of shipments, the top 8 65.7%, the top 20 83.9%, and the top 50 95.1%; the Herfindahl-Hirschman Index (HHI, a standard concentration gauge) is 837.9 (2022) [1].
• Small-business threshold: the U.S. Small Business Administration (SBA) counts a firm here as small up to 1,000 employees [3].

Product mix (historical benchmark). Census's 2016 Manufacturing and International Trade Report broke out $10.996 billion of 335929 product shipments: $2.980 billion of power wire and cable, $3.299 billion of electronic wire and cable, $716 million of low-voltage telecommunications and premises cable, $2.433 billion of building wire, and $1.179 billion of other insulated, automotive, control and signal cable [22].

Physical volume vs. nominal value. Price and volume data warn against treating nominal sales growth as physical growth. The Federal Reserve's broader NAICS 33592 industrial-production index (which includes fiber-optic cable) stood at 71.99 in 2025 with 2017 equal to 100, while the BLS producer-price index for 335929 reached 344.26 in December 2025 with December 2003 equal to 100 [23][24]. Nominal market estimates can rise even while measured physical production is lower.

Undercount caveat — read this before using the $10 billion. Unlike restaurants or trades, this industry is not undercounted because of tiny or informal operators; it is a small set of sizable factories. The measurement quirks run the other way:

1. Vertically integrated producers vanish into other codes. Any plant that both draws copper wire and insulates it in the same building is booked under copper drawing (NAICS 331420), not here [4]. Several of the largest U.S. cable operations are integrated this way — Encore Wire, for example, manufactured most of its copper-rod requirements internally in 2023 [14] — so a meaningful share of real "insulated wire and cable" output lives outside the $10 billion figure. The 335929 number understates the true domestic footprint.
2. The dollar figure is metal-price-sensitive. Because most sales pass copper cost straight through, the same physical volume produces very different revenue depending on the copper price. The 2022 receipts were struck at far lower copper prices than the record levels of 2025-2026, so nominal industry sales today are materially higher for the same tonnage [14][15].
3. The concentration snapshot predates the big deals. The 2022 HHI of 837.9 (technically "unconcentrated" by antitrust yardsticks) was measured before Prysmian bought Encore Wire (2024) and Amphenol bought CommScope's cable unit (2026); actual concentration today is higher than the reported ratios [5][8].

4. The investable universe

There is no U.S.-listed pure-play wire maker anymore — Encore Wire, the last one, was taken private inside Prysmian in 2024 [5][25]. Public exposure now comes mainly through diversified or foreign-listed groups; the biggest domestic capacity is privately or parent-held.

Major private / other owners (no direct stock):

• Southwire — the largest U.S. wire and cable producer, private and family-controlled, based in Carrollton, GA; roughly $8-9 billion revenue and an estimated ~15% of the U.S. wire-and-cable market [11].
• Superior Essex — owned by Korea's LS Cable & System; world's largest magnet-wire maker with major U.S. operations [13].
• Okonite — employee-owned, operating six U.S. plants producing insulated cable from 300 volts through 345 kilovolts [27].
• Service Wire — multi-generation family-owned manufacturer serving industrial, commercial and utility markets [28].
• Japanese groups (Sumitomo Electric, Furukawa, Fujikura) hold U.S. capacity, especially in communications and specialty cable.

5. How the money works

Owners here make money by converting metal, not by selling metal — the core metric is the spread: the price per pound of finished wire minus the cost per pound of the copper or aluminum inside it [14][20].

• Copper is the dominant input cost. Encore Wire reported that copper represented 80.8% of the dollar value of raw materials used in 2023 — copper cost alone was 52.2% of sales, other raw materials 12.5%, and labor and overhead 8.7% [14]. Contracts and quotes typically pass copper through as a "copper adder" indexed to the COMEX or LME (the New York and London metal exchanges) price, so the maker's real economics are the fabrication margin layered on top, plus how well it times inventory [20].
• Spread expands and compresses with the cycle. When demand is strong and metal is rising, makers often earn inventory gains and wider spreads; when metal falls faster than selling prices, spreads compress. Wire prices can move daily, but pass-through timing is imperfect: distributor price lists generally change several weeks after announcements, while some OEM pass-through provisions lag raw-material changes by several weeks to three months [29]. Encore Wire is the clean illustration: in 2023 its average selling price per copper pound fell 17.8% while its copper cost per pound fell only 3.7% — a squeeze on margin even though copper pounds shipped increased 6.7%. Sales declined from $3.018 billion in 2022 to $2.568 billion in 2023, gross margin fell from 36.9% to 25.5%, and operating margin from 30.4% to 17.6% [14]. These were exceptionally profitable years and should not be treated as normalized industry margins.
• Volume and utilization matter. These are capital-intensive plants (extrusion lines, stranders, reels). Running them full spreads fixed cost over more pounds; pounds shipped and capacity utilization are the volume levers [14].
• Mix matters. Commodity building wire is competitive and thin-margin; specialty, armored, utility, and data-grade cable carry richer margins. Product mix shift is a lever independent of the metal cycle.
• Vertical integration is an edge. Owning rod mills and wire-drawing lets a producer capture more of the chain and buffer metal timing — one reason integrated players (Southwire, and Encore before its sale) have been structurally strong [11][14].
• Working capital intensity. The business is working-capital heavy. Producers hold metal, work in process and finished cable while also extending credit to distributors. Encore said a significant majority of sales were collected within approximately 75 days of invoice and maintained substantial finished-goods inventory to support prompt delivery [14]. Rising copper prices can therefore increase reported sales while consuming cash.

So the honest read: revenue is inflated or deflated by copper regardless of activity, and the quality signal is spread-per-pound and pounds shipped, not headline sales.

6. What drives demand

Demand is unusually broad right now because several electrification waves are pulling at once:

• Construction. Residential and commercial building wire (THHN, MC cable) tracks housing starts and non-residential building. This is the largest single volume base and the most cyclical. Distributor restocking and destocking can amplify end-market movements because manufacturers generally have short order-to-shipment cycles rather than long protected backlogs.
• Grid modernization and transmission/distribution (T&D). Utilities are rebuilding and expanding the grid; more than $777 billion in grid spending is reported as planned for this decade, and power cable remains the largest-volume cable segment [19]. DOE's 2023 transmission study found that median U.S. regional transmission capacity would need to grow 20% by 2035 in a moderate-load/moderate-clean-energy case, 64% in a moderate-load/high-clean-energy case, and 128% in a high-load/high-clean-energy case, each relative to the 2020 system [30].
• Data centers and AI. The fastest-growing end market. U.S. electricity demand is rising again — the Energy Information Administration (EIA) projects about 4,193 billion kWh in 2025 and 4,283 billion kWh in 2026, roughly 2% annual growth and the first sustained rise in nearly two decades — much of it digital load [18]. DOE estimated that data centers consumed 176 terawatt-hours, or about 4.4% of U.S. electricity, in 2023, and projected 325–580 terawatt-hours (approximately 6.7%–12% of U.S. electricity) by 2028 [31]. Hyperscale data centers alone are estimated to add 50,000-110,000 tons of incremental copper demand a year in 2026 [19]. Prysmian announced a $500 million, five-year expansion of the former Encore campus — including a new facility exceeding 650,000 square feet and up to 120 new jobs — directed at data-center, grid and industrial-electrification demand [32].
• Electrification of transport and renewables. EV charging, wind, and solar all add copper and aluminum cable content.
• Reshoring and industrial construction. New U.S. factories pull power and control cable.

Not every segment benefits. Copper telecommunications cable faces continuing substitution by fiber in access and backbone networks — and fiber output belongs to 335921, not 335929. Aluminum can substitute for copper in utility and selected building-wire applications when the installed economics justify larger conductor sizes and compatible terminations.

Forward-looking judgment: the structural demand backdrop is the strongest this industry has seen in years, and we expect it to stay supportive through the balance of the decade — but that is a volume story; it does not guarantee wide spreads if metal prices whipsaw.

7. Regulation

• Product safety and standards. Finished cable must meet the National Electrical Code (NEC, published as NFPA 70), carry Underwriters Laboratories (UL) listings, and satisfy ASTM and ICEA (Insulated Cable Engineers Association) specifications. These standards are effectively the license to sell and a real barrier to casual entry [14].
• Trade policy — the live wire. In July 2025 the U.S. imposed a 50% Section 232 national-security tariff on the declared copper content of specified imported semi-finished copper products and copper-intensive derivatives, including covered wire and cable, effective August 1, 2025 (cathode, ores and scrap were excluded) [16][17]. A follow-on structure in 2026 added tariffs on copper-intensive derivatives including insulated cable (25%, or 10% if the copper/steel/aluminum is at least 95% U.S.-sourced) [17]. This cuts both ways: it protects domestic makers from imported finished cable while raising the cost of imported metal inputs. The metal-tariff regime was adjusted again in mid-2026, underscoring that investors must check the current HTS classification, country of origin and metal-content rules for each product rather than assuming a single industry-wide rate [33].
• Domestic-content rules. Build America, Buy America (BABA) provisions attach to federally funded infrastructure and favor U.S.-made cable, a tailwind for domestic capacity.
• Antidumping/countervailing duties periodically apply to specific imported wire and cable categories.
• Environmental. Metals handling and insulation compounds (PVC and other polymers) bring the usual manufacturing environmental compliance, including air emissions, waste, hazardous substances and PVC chemistry liabilities.

8. Competitive dynamics and consolidation

The industry is top-heavy and consolidating. The top four firms already make nearly half of shipments [1], and the biggest deals of the last decade have concentrated it further:

• Prysmian bought General Cable in 2018 and Encore Wire in 2024 ($290 per share in cash, approximately €3.9 billion enterprise value — 8.2 times 2023 EBITDA, or 6.3 times including projected run-rate synergies), making the Italian group the dominant force in U.S. building wire [5][6][34].
• Amphenol acquired CommScope's Connectivity & Cable Solutions unit for $10.5 billion, closing in early 2026, consolidating communications cable and connectivity [8].
• Southwire has grown by acquisition (including Coleman Cable) to lead the U.S. market as a private integrated producer [11].

Encore's last independent filing identified Southwire, Cerrowire, General Cable/Prysmian and AFC Cable Systems/Atkore as its main building-wire competitors and noted that the number of manufacturers had declined [14].

Two structural features stand out. First, foreign ownership of U.S. capacity is heavy — Prysmian (Italy), Nexans (France), Superior Essex/LS (Korea), plus Japanese groups — so a "domestic" industry is substantially foreign-parented [7][13]. Second, integration and scale win: rod mills, wire drawing, and national distribution reach are advantages the long tail of small specialty makers cannot easily match. Competition at the commodity building-wire end is price-driven; differentiation lives in specialty, utility, and data-grade cable.

9. Risks

• Metal-price volatility. Copper hit record highs into 2025-2026 (COMEX around $6.71/lb intraday in May 2026; up roughly 44% in 2025) [15]. Sharp reversals compress spreads and can produce inventory losses; this is the single biggest earnings risk [14][15].
• Construction cyclicality. The largest volume base tracks housing and commercial building, which turn with rates and the economy. Distributor destocking can amplify end-market downturns.
• Trade whiplash. Tariff levels and coverage have moved repeatedly; the same policy that protects domestic finished cable raises input costs and can be reversed [16][17][33].
• Import competition. Foreign cable, when tariffs allow, pressures commodity pricing.
• Substitution. Aluminum substitutes for copper when the copper premium is extreme; fiber (335921) displaces copper coax in some communications uses.
• Capital intensity and customer concentration. Plants are expensive to run below capacity, and sales funnel through a few large electrical distributors (for example WESCO, Rexel, Sonepar), which holds pricing power over smaller makers.
• Labor and operational risk. Labor is a smaller cost than metal but remains operationally important. Plants need technicians and production workers able to operate and maintain high-speed drawing, extrusion, take-up and material-handling systems safely. Encore employed 1,629 people at year-end 2023, of whom 1,350 were hourly workers primarily operating and maintaining manufacturing and warehouse facilities [14]. Automation reduces labor per pound but raises the cost of downtime and the need for skilled maintenance.
• Product liability. Product qualification is a barrier but also a liability; failures and warranty claims are a risk.

10. How to invest and the outlook

Public-market routes (reserve for the investor comfortable owning a diversified proxy, since no U.S. pure play remains):

• Diversified / foreign-listed cable makers: Prysmian (Milan: PRY) is the most direct large-cap exposure to U.S. building and energy cable after absorbing Encore Wire and General Cable [6][7]; Nexans (Paris: NEX) is a secondary route [7].
• U.S. construction cable exposure: Atkore (NYSE: ATKR) offers U.S. construction exposure through AFC Cable Systems, though it also owns conduit, fittings, framing, mechanical pipe and cable-management businesses [26].
• Connectivity and specialty cable: Amphenol (NYSE: APH), Belden (NYSE: BDC), TE Connectivity (NYSE: TEL), and the slimmed-down CommScope (NASDAQ: COMM) give signal- and data-cable exposure [8][9][10].
• Indirect: Berkshire Hathaway (NYSE: BRK.B) owns Cerrowire through Marmon [12]; electrical distributors such as WESCO (NYSE: WCC) offer a downstream, volume-linked proxy.
• Upstream proxy: copper miners and copper ETFs move on the same electrification demand, though they are a metal bet, not a fabrication-margin bet.

Private-market routes: the deepest direct exposure is private — Southwire, Service Wire, Okonite, and sponsor- or family-owned regional cable makers, reachable through direct acquisition, private credit to manufacturers, or supplier/customer positions in the electrical supply chain [11][27][28]. Foreign parents (LS, Sumitomo, Furukawa) also hold U.S. plants [13]. The diligence focus should be metal pass-through mechanisms, normalized pounds and conversion margin rather than nominal revenue, plant classification and integration status, customer and distributor concentration, qualification status, maintenance capex, scrap recovery, working capital and environmental history. The Encore transaction (8.2x EBITDA, or 6.3x with synergies) is the clearest disclosed strategic comparable [34].

Outlook (forward-looking judgment). The demand setup is the best in a generation: grid rebuild, AI-driven data centers, reshored factories, and electrified transport all consume copper and aluminum cable, and U.S. power demand is rising for the first time in ~20 years [18][19][30][31]. Tariffs and Buy-America rules tilt toward domestic producers [16]. The offsetting reality is that this remains a spread business geared to a volatile metal — record-high copper flatters revenue but can crush margins on the way down. We judge the multi-year volume trajectory as strongly positive, while near-term earnings will hinge on the copper cycle and how cleanly makers pass cost through. For most investors the practical exposure is diversified (Prysmian, Amphenol, Atkore, Belden) or private, not a single American wire stock — that ship sailed with Encore Wire in 2024 [5].

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Sources

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