Communication and Energy Wire and Cable Manufacturing (United States)

NAICS 2022 code 33592 — a rollup primer for public-market and private investors

(NAICS = North American Industry Classification System, the federal statistical taxonomy for industries. This five-digit "industry" sits one level above its two component industries: 335921 and 335929.)

1. Overview

This industry is where raw conductor becomes finished cable — the physical media that move electricity and information through the U.S. economy. It bundles two closely related but economically distinct trades under one federal code:

• 335921 — Fiber Optic Cable Manufacturing: taking purchased glass fiber and turning it into jacketed cable that carries data as pulses of light.[6]
• 335929 — Other Communication and Energy Wire Manufacturing: taking purchased copper or aluminum wire and turning it into insulated cable that carries electricity and electrical signals.[6]

For an investor, the two halves rhyme. Both are "picks-and-shovels" suppliers to the same handful of megatrends — artificial-intelligence (AI) data centers, grid rebuilds, rural-broadband build-outs, reshored factories, and electrified transport — and both are enjoying the strongest demand backdrop in years.[37][38][44][45] Both are also capital-intensive, cyclical converters with heavy foreign ownership of their U.S. plants, both are undercounted by their own federal definitions in the same direction, and neither has a large U.S.-listed pure-play left to buy.

But the economics differ in a way that matters. Fiber is a glass-and-utilization business geared to a genuine supply shortage; copper-and-aluminum wire is a metal-spread business geared to the copper cycle. Understanding that split — and the fact that a few of the same companies straddle both, while in access networks the two products directly substitute for each other — is the whole point of looking at this level rather than the two children separately.

2. What's inside — the two child industries and how they differ

At the combined level, one child is roughly three times the other. Copper-and-aluminum wire (335929) is the larger, broader, more construction-driven half; fiber (335921) is the smaller, faster-growing, more tech-driven half.

The two indexes in the "price signal" row use different base periods and are not comparable in level — the point is the direction of travel, which has been opposite.[9][10] One more thing is identical on both sides: the federal definition of "small." The Small Business Administration counts a firm in either child as small up to 1,000 employees, so nearly the whole long tail below the top tier qualifies.[7]

Where they converge. Despite the different physics, the two children share owners and buyers to an unusual degree. Amphenol's $10.5 billion purchase of CommScope's Connectivity & Cable Solutions (CCS) unit — closed 9 January 2026 — bought fiber cable and copper communications cable at once.[18] That single acquired business recorded $3.755 billion of 2025 sales, which happens to be about what the entire fiber child reported in federal receipts for 2022 — though CCS also includes copper cable, connectivity, software and enclosures, so it is not a like-for-like comparison.[19][2] Prysmian — the world's largest cable maker — leads in both energy/building wire (via Encore Wire and General Cable) and telecom fiber cable.[23][25] Japanese and Korean groups (Sumitomo, Furukawa/OFS, Fujikura/AFL, LS Cable & System) hold U.S. capacity across both.[34][36] Tellingly, Corning names Amphenol, Fujikura/AFL, Sumitomo and Prysmian as its principal competitors — a list in which three of four are straddlers or foreign parents active on both sides of this code.[14] That overlap is the rollup's key practical insight: a single diversified name can hand an investor both halves of the level in one holding.

Where they diverge. The demand signals differ. Fiber's swing factor is data-center and broadband build velocity against slow-to-add glass capacity — a volume-and-shortage story. Wire's swing factor is the copper price, which flatters revenue on the way up and can crush spreads on the way down regardless of how many pounds ship.[27] And in one segment they are not merely different but opposed: copper telecommunications and coaxial cable keeps losing access-network share to fiber, so part of 335921's growth comes directly out of 335929's product mix — a share shift inside this five-digit code that nets out at the rollup level.[6] An investor who conflates the two will misread which lever is moving earnings.

3. How big it is

Our federal ground-truth figures for the combined level, NAICS 33592 (U.S. Census Bureau unless noted):[1]

The two children reconcile to that published rollup almost exactly: establishments (130 + 212 = 342), employment (8,325 + 15,936 = 24,261) and annual payroll ($590.3M + ~$1.17B ≈ $1.76B) all line up, and receipts ($3.76B + ~$10.0B ≈ $13.8B) match.[2][3][4][5] The firm counts don't quite sum — 99 + 169 = 268 versus 263 at the rollup — because a handful of companies (the straddlers named above) run plants in both children and are counted once here.[1][2][4]

Concentration. At the combined level the top 4 firms hold 40.4% of receipts, the top 8 56.9%, the top 20 79.8%, and the top 50 92.1% (CR4/CR8/CR20/CR50 are standard four-, eight-, twenty- and fifty-firm concentration ratios).[1] Note that this combined CR4 (40.4%) reads lower than either child's own CR4 — fiber 64.6% (CR8 82%, CR20 91.9%), wire 48.3% (CR8 65.7%, CR20 83.9%, CR50 95.1%) — a statistical artifact of merging two industries whose leaders aren't all the same firms, not evidence of a fragmented field.[2][4] The Herfindahl-Hirschman Index (HHI, the standard squared-market-share concentration gauge) for the rollup is suppressed in our source, so we do not state one; for the children individually it was 1,364.7 (fiber, moderate concentration) and 837.9 (wire, technically unconcentrated).[2][4]

Volume versus value — the one series that spans the whole level. The Federal Reserve publishes an industrial-production index at exactly this five-digit code, covering both children. NAICS 33592 output stood at 71.99 in 2025 against a 2017 base of 100 — measured physical production roughly 28% below its 2017 level, even though the demand narrative is the most bullish in a generation.[8] Set that against the children's price series, which have moved in opposite directions (the fiber index fell 13.9% into late 2024 before being discontinued; the wire index sits at 344.26 on a 2003 base), and the lesson is blunt: at this level nominal sales are heavily a metal-price and mix story, and rising revenue is not evidence of rising tonnage.[9][10] The only clean physical benchmark either child offers is fiber's — U.S. optical-fiber-cable production of 48 million fiber-kilometers in 2022, or 9.7% of world output, with USGS putting U.S. shipments of two optical-cable product categories at $3.132 billion in 2021. ("Fiber-kilometers" multiply route length by strand count and are not kilometers of installed route.)[12]

Where the value sits inside the larger half. Only the wire child has a product-level breakout, and it is dated: Census's 2016 report split $10.996 billion of 335929 product shipments into $3.299 billion of electronic wire and cable, $2.980 billion of power wire and cable, $2.433 billion of building wire, $1.179 billion of other insulated/automotive/control/signal cable, and $716 million of low-voltage telecommunications and premises cable.[11] Useful shape, not a current market share — electronics and power, not just building wire, carry the tonnage.

Undercount caveat — and it runs the same direction for both halves. The $13.77 billion understates the true economic footprint, because the federal definitions strip out adjacent value on both sides. In fiber, the single most valuable step — drawing glass fiber from a preform — sits in glass manufacturing (NAICS 32721), not here.[6] In copper/aluminum wire, any plant that both draws the metal wire and insulates it in the same building is booked under copper drawing (NAICS 331420) or aluminum drawing (331318), pulling several of the largest integrated U.S. cable operations out of the count — Encore Wire, for instance, made most of its own copper rod.[6][27] A vivid single-company illustration: Corning's Optical Communications segment alone reported $4.66 billion in 2024 sales and $6.27 billion in 2025 — larger than the entire fiber child's federal receipts — precisely because it folds in the glass, cable, and hardware the narrow codes separate.[13][14] Third-party estimates that bundle those pieces put the U.S. fiber-optic-cable market at roughly $5–6 billion and the global market near $16 billion in 2024.[40] Read the $13.77 billion as the "convert-purchased-conductor" slice, not the whole wire-and-cable economy. One more wrinkle unique to the wire half: because copper cost passes straight through to price, the 2022 receipts were struck at far lower copper prices than 2025–26 levels, so the same physical tonnage would post materially higher nominal sales today.[27][49]

4. The investable universe

There is no large, U.S.-listed pure-play anywhere in this level. The fiber half never really had one beyond a micro-cap; the wire half lost its last pure-play (Encore Wire) to Prysmian in 2024.[25] So public exposure is a slice of bigger, mostly diversified or foreign-listed companies, and the deepest capacity is private or foreign-parented. Tickers and scale below are for orientation, not recommendations.

The straddlers (exposure to both children at once):

(ADR = American depositary receipt, a U.S.-traded proxy for a foreign-listed share.)

Fiber-tilted (335921):

Copper/aluminum-wire-tilted (335929):

Major private / foreign-subsidiary owners (not directly investable here, but they define the field):

• Southwire — largest U.S. wire-and-cable producer; private; ~$8–9B revenue, an estimated ~15% of the U.S. wire-and-cable market.[33]
• Superior Essex — U.S. communications and magnet wire; owned by Korea's LS Cable & System; the world's largest magnet-wire maker.[34]
• OFS (Furukawa), AFL (Fujikura), Sumitomo Electric — Japanese-parented fiber-and-cable capacity in the U.S.; AFL alone announced more than $50 million of South Carolina cable-plant investment in 2024.[36]

Bottom line for stock-pickers: value in this level concentrates in the larger copper/aluminum-wire half by revenue (~73%), but the fastest-growing, highest-margin pockets sit in fiber and in specialty/data-grade copper cable. Because there's no clean pure-play, the practical trade is to own a diversified straddler (Amphenol, Prysmian) and accept that cable is one revenue stream among several.

5. How the money works

Both halves are capital-intensive factory businesses that make money by filling expensive lines with high-margin volume — but the profit lever differs.

• Fiber (335921): utilization × ASP, plus glass control. Cabling lines are costly fixed assets; when plants run full, incremental volume drops largely to profit, and when carriers pause, fixed costs crush margins. Product mix toward specialty cable (high-fiber-count, ribbon, bend-insensitive, armored, data-center) lifts ASP. Scale is the difference between operating leverage that works and operating leverage that doesn't: Optical Cable Corporation's FY2025 sales rose 9.5% to $73.0 million while gross profit rose 24.1% to $22.6 million (margin 27.3% → 30.9%), yet it still posted a $0.5 million operating loss because gross profit didn't cover corporate and selling costs — while the far larger CCS franchise earned a 36.5% gross and 19.7% operating margin on $3.755 billion, albeit on a mix that also includes copper cable, connectivity and software.[22][19] The structural edge is vertical integration into glass — makers who draw their own fiber (Corning, OFS, Sumitomo) enjoy cost and supply security when glass is scarce.[6] Because new capacity takes 12–24 months, buyers lock in multi-year contracts; Corning's >$1 billion AT&T deal and ~$6 billion Meta-anchored arrangement de-risk plants before they're built.[17][37]
• Wire (335929): the metal spread. Owners convert metal, they don't sell it — and the metal dominates the cost stack: at Encore Wire in 2023, copper was 80.8% of raw-material dollars and 52.2% of sales, against 12.5% for other raw materials and 8.7% for labor and overhead.[27] Copper is passed through as a "copper adder" indexed to the COMEX or LME exchanges (the New York and London metal markets), so real economics are the fabrication margin per pound layered on top, plus inventory timing.[48] Pass-through is not instantaneous: distributor price lists generally change several weeks after announcements, and some original-equipment pass-through provisions lag raw-material moves by several weeks to three months.[31] The classic illustration is Encore in 2023: selling price per copper pound fell 17.8% while copper cost per pound fell only 3.7% — even as pounds shipped rose 6.7% — and sales fell from $3.018 billion to $2.568 billion, gross margin from 36.9% to 25.5%, operating margin from 30.4% to 17.6%.[27] Those were exceptionally profitable years and should not be read as normalized industry margins. Here vertical integration means owning rod mills and wire-drawing lines to buffer metal timing, and the business is working-capital heavy: rising copper simultaneously inflates reported sales and consumes cash.[27]

The shared honest read: for both halves, headline revenue is a poor quality signal — inflated in fiber by segment bundling, and in wire by the copper price — and the level-wide production index says measured physical output is well below its 2017 level even now.[8] The real signals are pounds and fiber-kilometers shipped, capacity utilization, and margin (spread) per unit, plus backlog and anchor customers.

6. What drives demand

The two halves are pulled by overlapping waves, all currently pointing up:

• AI data centers — the common accelerant. AI compute needs enormous fiber inside and between buildings (AI-optimized facilities use roughly 5–10× the fiber of conventional cloud sites), and enormous copper/aluminum power cable to feed the racks.[37][45] Data-center fiber is projected to jump from under 5% of global fiber demand in 2024 toward ~30% by 2027, and Corning's enterprise-network sales — the data-center-weighted line — rose from $1.98 billion in 2024 to $3.20 billion in 2025.[38][15] On the power side, the Department of Energy estimated data centers consumed 176 terawatt-hours (~4.4% of U.S. electricity) in 2023 and projected 325–580 TWh (~6.7%–12%) by 2028; hyperscale sites alone may add 50,000–110,000 tons of incremental copper demand a year in 2026.[47][45]
• Grid modernization (mostly the wire half). Utilities are rebuilding transmission and distribution (T&D); more than $777 billion in U.S. grid spending is reported as planned this decade, and power cable is the largest-volume cable segment.[45] DOE's 2023 transmission study found median regional transmission capacity would need to grow 20% by 2035 in a moderate-load/moderate-clean case, 64% in a moderate-load/high-clean case and 128% in a high-load/high-clean case, each against the 2020 system.[46] U.S. electricity demand is rising again — the Energy Information Administration (EIA) projects ~4,193 billion kWh in 2025 and ~4,283 billion kWh in 2026, the first sustained rise in nearly two decades.[44]
• Rural broadband (mostly the fiber half). The federal Broadband Equity, Access, and Deployment (BEAD) program — $42.45 billion — is moving into construction, with most states choosing fiber.[41] The runway is real: the Fiber Broadband Association counted 76.5 million U.S. homes passed by fiber at year-end 2024 (up 13% in the year, 45.2% subscriber adoption), and the FCC put fiber at 100/20 Mbps in front of 63.5 million of 115.8 million broadband-serviceable locations — about 55%.[42][43]
• Reshoring, EVs and renewables. New U.S. factories, electric-vehicle (EV) charging, wind and solar all add cable content across both halves.

Two honest qualifiers the children now insist on. First, BEAD's $42.45 billion is a program authorization, not a cable-buying budget — it also funds construction, labor, electronics and planning — and the 2025 technology-neutral reform lets fixed wireless and satellite compete with fiber for some funded locations.[41][51] Second, not every segment inside this level benefits: copper telecom and coax keep ceding access-network share to fiber, and aluminum substitutes for copper in utility and some building applications when the copper premium is extreme.[6]

Because fiber capacity is slow to add, its demand has produced a genuine supply shortage — extended lead times and firming prices into 2026.[37][39] The wire half is a broad volume story rather than a shortage, with margin gated by the metal cycle.

7. Regulation

Neither half is rate-regulated like a utility, but policy shapes both powerfully — and much of it applies across the whole level:

• Build America, Buy America (BABA). Federally funded broadband and infrastructure generally requires domestically manufactured cable. NTIA's waiver framework requires specified optical-fiber and fiber-cable manufacturing steps to occur in the United States and has estimated that close to 90% of BEAD equipment spending would go to U.S.-manufactured equipment — a direct tailwind for U.S. plants in both children, and a reason foreign groups keep expanding American capacity (AFL's South Carolina investment is a small, concrete example).[50][41][36]
• Trade and tariffs (a live wire for both). On the copper side, the U.S. imposed a 50% Section 232 national-security tariff on the declared copper content of specified semi-finished copper products and copper-intensive derivatives, including covered wire and cable, effective 1 August 2025 (cathode, ores and scrap excluded); a 2026 follow-on added tariffs on copper-intensive derivatives including insulated cable at 25%, or 10% where the copper/steel/aluminum is at least 95% U.S.-sourced, and the regime was adjusted again in mid-2026.[53][54][55] The practical implication is that there is no single industry-wide rate — classification, country of origin and metal content decide it product by product. On the fiber side, U.S. antidumping/Section 301 duties limit cheap Chinese optical imports, while in September 2025 China imposed a ~37.9% antidumping duty on U.S.-made single-mode fiber, curbing U.S. exporters.[52]
• Safety codes and standards. Finished copper cable must meet the National Electrical Code (NEC, published as NFPA 70), carry Underwriters Laboratories (UL) listings, and satisfy ASTM/ICEA specs; fiber jacketing must meet building and fire codes. These standards are effectively the license to sell and a real barrier to casual entry.[27]
• Environmental compliance. Metals handling and insulation compounds (PVC and other polymers) bring the usual manufacturing burden — air emissions, waste, hazardous substances and PVC chemistry liabilities — weighted toward the wire half.[6]

8. Consolidation

The level is top-heavy and consolidating, with the same deals reshaping both halves:

• Amphenol → CommScope CCS ($10.5B, closed January 2026) consolidated communications cable and connectivity — touching both the fiber and copper-communications children in one transaction, and moving a business with $3.755 billion of 2025 sales under one owner.[18][19]
• Prysmian → General Cable (2018) and Encore Wire (2024) made the Italian group the dominant force in U.S. building/energy wire and a leading telecom-fiber cabler. Encore went at $290 per share, ~€3.9 billion enterprise value — 8.2× 2023 EBITDA, or 6.3× including run-rate synergies, the clearest disclosed comparable for the level.[25][26] Prysmian has since committed a further $500 million over five years to expand the former Encore campus (a facility exceeding 650,000 square feet, up to 120 jobs) for data-center, grid and industrial-electrification demand.[28]
• Corning is expanding via anchor-customer offtake deals rather than M&A, effectively pre-selling new fiber capacity.[17]
• Southwire has grown by acquisition (including Coleman Cable) to lead the U.S. wire market as a private integrated producer.[33]

Two structural features cut across the level. First, foreign ownership of "U.S." capacity is heavy — Italian (Prysmian), French (Nexans), Korean (LS/Superior Essex) and Japanese (Sumitomo, Furukawa, Fujikura) groups all hold major domestic plants.[24][29][34] Second, integration and scale win: controlling the upstream input (glass for fiber, rod mills for copper) and national distribution reach are advantages the long tail of small specialty makers cannot easily match — Encore's last independent filing named Southwire, Cerrowire, General Cable/Prysmian and AFC Cable Systems/Atkore as its principal building-wire rivals and observed that the number of manufacturers had declined.[27] Note that the 2022 concentration snapshots predate the Prysmian–Encore and Amphenol–CommScope closings, so actual concentration today is higher than the reported ratios in Section 3.

9. Risks

• Cyclicality and inventory whiplash (both). Demand tracks lumpy carrier, hyperscaler and construction capex. Corning's Optical Communications sales went $5.02B (2022) → $4.01B (2023) as customers destocked, then $4.66B (2024) → $6.27B (2025) as AI demand returned — the same plants, very different economics, and a reminder that today's shortage can flip to glut.[16][13][14]
• Copper-price volatility (wire half). Copper hit records into 2025–26 (COMEX around $6.71/lb intraday May 2026, up ~44% in 2025); sharp reversals compress spreads and cause inventory losses — the single biggest earnings risk on that side.[49][27]
• Input/glass supply (fiber half). Non-integrated cablers depend on scarce purchased fiber; a glass shortage squeezes them hardest.[37]
• Capacity overshoot (both). The whole level is expanding into the boom; if demand normalizes, manufacturing cycles reliably end in oversupply and margin compression — and the level-wide production index shows output is still below 2017, so the installed base is not obviously capacity-starved in aggregate.[8]
• Trade whiplash (both). The copper tariff regime has been rewritten three times since mid-2025, and foreign antidumping actions cut the other way; the same policy that protects domestic makers raises input costs and can reverse abruptly.[52][53][54][55]
• Customer concentration and distributor power. A few hyperscalers and telcos drive fiber orders; wire sales funnel through a few large electrical distributors (WESCO, Rexel, Sonepar) that hold pricing power over smaller makers.
• Policy timing (fiber). BEAD timelines have repeatedly shifted, and the 2025 technology-neutral reform may route some funded projects to fixed wireless or satellite instead of fiber.[41][51]
• Downstream bottlenecks (fiber). Cable production is not always the binding constraint — the Fiber Broadband Association found smaller providers believed they could build 7% more network absent labor shortages, with permitting and pole access larger obstacles still; slower field construction defers cable orders.[42]
• Labor and product liability (wire). Automation cuts labor per pound but raises the cost of downtime and the need for skilled maintenance; Encore employed 1,629 people at year-end 2023, 1,350 of them hourly. Product qualification is a barrier to entry and also a warranty and liability exposure.[27]
• Substitution (long-tail). Aluminum substitutes for copper at extreme premiums; fiber displaces copper coax inside this very code; hollow-core fiber, denser optics and wavelength multiplexing mean traffic can grow without proportional cable volume — slow-moving rather than imminent.

10. How to invest and the outlook

Public-market routes. Since there's no clean pure-play, the practical choices, by exposure:

• Straddlers (both halves): Amphenol (APH) now that it owns the former CommScope cable franchise, and Prysmian (PRY, Milan) for the broadest combined building-wire-plus-fiber exposure; Nexans (NEX, Paris) is a secondary route. In each, cable is a large segment, not the whole company — which dilutes both upside and risk.
• Fiber tilt: Corning (GLW) for integrated glass-and-cable; Optical Cable Corp. (OCC) is the only listed U.S. fiber pure-play but is a thinly traded micro-cap that has grown revenue and gross margin without yet clearing its operating cost base.[22]
• Wire tilt: Atkore (ATKR) for U.S. construction cable via AFC Cable Systems; Belden (BDC) and TE Connectivity (TEL) for signal and data copper cable; Berkshire Hathaway (BRK.B) for indirect Cerrowire exposure; downstream, distributors such as WESCO (WCC) offer a volume-linked proxy.
• Theme without factory risk: the fiber deployers (telecom/broadband carriers) and data-center owners on the demand side, or copper miners/ETFs on the input side (a metal bet, not a fabrication-margin bet).

Private-market routes. The deepest direct exposure is private and already dominant — Southwire and regional/specialty wire makers on the copper side; OFS, AFL, Superior Essex on the fiber side.[33][34][36] Sponsors reach the level through direct acquisition, private credit to manufacturers, greenfield plant investment plus long-term offtake (the Meta–Corning and AT&T–Corning deals are the template), and positions in the surrounding connectivity-hardware and network-construction ecosystem.[17] Diligence differs by half but rhymes: on the wire side, metal pass-through mechanics, normalized pounds and conversion margin rather than nominal revenue, plant classification and integration status, working capital and environmental history; on the fiber side, actual cable-versus-connectivity revenue mix, backlog cancellation rights, strand-supply contracts, BABA qualification, utilization, scrap and yield. The Encore transaction at 8.2× EBITDA (6.3× with synergies) remains the clearest disclosed strategic comparable.[26]

Outlook (forward-looking judgment). The setup entering the mid-2020s is the best this level has seen in a generation. AI data centers pull on both halves at once — fiber for data, copper/aluminum for power — alongside grid rebuild, BEAD broadband, reshoring and electrified transport, against capacity that is slow to add.[37][38][41][44][45][46][47] Domestic-content rules and reshoring add a policy tailwind for U.S. plants.[50] Two disciplines on that enthusiasm. First, the volume story is not yet visible in the level's own physical output index, which still sits well below 2017 — the boom is largely ahead of the data, not behind it.[8] Second, the credible bear case is not weak demand but overbuild on the fiber side and a copper reversal on the wire side: fiber's shortage can become a glut, and wire's record-high copper flatters revenue but can crush spreads on the way down.[27][49] The likely winners across the level are the same profile in both children — vertically integrated, scale producers who control their own input (glass or metal), lock in anchor customers before adding lines, and keep plants full when the cycle eventually turns. For most investors the realistic exposure is diversified (Amphenol, Prysmian, Corning, Atkore, Belden) or private — a single American cable stock is no longer on the menu.

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Sources

1. U.S. Census Bureau. 2022 Economic Census and 2023 County Business Patterns, NAICS 33592 (rollup receipts, firms, establishments, employment, payroll, concentration ratios; HHI suppressed). https://www.census.gov/programs-surveys/economic-census.html
2. U.S. Census Bureau. 2022 Economic Census — Comparative Statistics & Concentration, NAICS 335921 (fiber receipts $3.76B, 99 firms, CR4 64.6% / CR8 82% / CR20 91.9%, HHI 1,364.7). https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Census Bureau. County Business Patterns 2023, NAICS 335921 (130 establishments, 8,325 employees, $590.3M annual payroll). https://www.census.gov/programs-surveys/cbp.html
4. U.S. Census Bureau. 2022 Economic Census — Industry Statistics and Concentration Ratios, NAICS 335929 (receipts ~$10.0B, 169 firms, CR4 48.3% / CR8 65.7% / CR20 83.9% / CR50 95.1%, HHI 837.9). https://www.census.gov/programs-surveys/economic-census.html
5. U.S. Census Bureau. County Business Patterns 2023, NAICS 335929 (212 establishments, 15,936 employees, ~$1.17B annual payroll). https://www.census.gov/programs-surveys/cbp.html
6. NAICS Association. 2022 NAICS Definitions — 335921 and 335929 (scope; cross-references to glass fiber 32721, copper drawing 331420, aluminum drawing 331318, connector and cord codes). https://www.naics.com/naics-code-description/?code=335921
7. U.S. Small Business Administration. Table of Small Business Size Standards (1,000 employees for both 335921 and 335929), 2023. https://www.sba.gov/document/support-table-size-standards
8. Federal Reserve Board via FRED. Industrial Production: Communication and Energy Wire and Cable (NAICS 33592) (71.99 in 2025, 2017 = 100), 2025. https://fred.stlouisfed.org/series/IPN33592A
9. Bureau of Labor Statistics via FRED. Producer Price Index — Cable made from purchased fiber (PCU3359213359210) (99.7 Apr 2023 → 85.9 Dec 2024 → 87.0 Jun 2025; series discontinued 2025). https://fred.stlouisfed.org/series/PCU3359213359210
10. Bureau of Labor Statistics via FRED. Producer Price Index: Other Communication and Energy Wire Manufacturing (NAICS 335929) (344.26 in December 2025, December 2003 = 100), 2025. https://fred.stlouisfed.org/data/PCU335929335929
11. U.S. Census Bureau. 2016 Manufacturing and International Trade Report (335929 product shipments by category: electronic $3.299B, power $2.980B, building wire $2.433B, other $1.179B, low-voltage telecom $716M of $10.996B). https://www.census.gov/foreign-trade/Press-Release/MITR/2016/2016_Manufacturing_and_International_Trade_Report.pdf
12. U.S. Geological Survey. Optical Fiber Supply Chain Analysis (U.S. shipments $3.132B in 2021; 48 million fiber-km production, 9.7% of world output, 2022), 2024. https://pubs.usgs.gov/publication/ofr20241057/full
13. Corning Incorporated / Business Wire. Corning Reports Strong Fourth-Quarter and Full-Year 2024 Results — Optical Communications sales $4.66 billion, 2025. https://www.businesswire.com/news/home/20250128076674/en/
14. Converge Digest. Corning Delivers Record 2025 Results, Raises Springboard Growth Targets — Optical Communications $6.27 billion; principal competitors, 2026. https://convergedigest.com/corning-delivers-record-2025-results-raises-springboard-growth-targets/
15. Corning Incorporated. 2025 Form 10-K, Segment Disclosure (enterprise-network $3.20B, carrier-network $3.08B in 2025; enterprise $1.98B in 2024). https://www.sec.gov/Archives/edgar/data/24741/000002474126000124/R27.htm
16. Corning Incorporated. 2022 Form 10-K, Segment Disclosure (Optical Communications $5.023B). https://www.sec.gov/Archives/edgar/data/24741/000143774923003123/R27.htm
17. Manufacturing Dive. Corning, Meta ink ~$6B deal supporting US manufacturing (plus >$1B AT&T fiber agreement), 2026. https://www.manufacturingdive.com/news/corning-meta-6-billion-data-center-ai-north-carolina-facebook-q4-2025/810772/
18. Amphenol Corporation. Amphenol Completes Acquisition of CCS Business From CommScope ($10.5B; closed 9 January 2026), 2026. https://investors.amphenol.com/news-and-events/news-details/2026/Amphenol-Completes-Acquisition-of-CCS-Business-From-CommScope/default.aspx
19. Amphenol Corporation. CommScope CCS Combined Financial Statements (2025 sales $3.755B, gross margin 36.5%, operating margin 19.7%, operating income $740M), January 2026. https://www.sec.gov/Archives/edgar/data/820313/000110465926036173/aph-20260109xex99d1.htm
20. Lightwave Online. CommScope Connectivity & Cable Solutions ~$2.8B revenue (2024), 2025. https://www.lightwaveonline.com/business/article/55244162/
21. Wikipedia. Amphenol (2024 revenue ~$15.2B), 2024. https://en.wikipedia.org/wiki/Amphenol
22. Optical Cable Corporation. Fiscal Year 2025 Form 10-K and Shareholder Letter (revenue $73.0M, +9.5%; gross profit $22.6M, +24.1%; gross margin 27.3% → 30.9%; $0.5M operating loss), 2025. https://www.sec.gov/Archives/edgar/data/1000230/000143774925038228/ex_897382.htm
23. Wikipedia. Prysmian Group (2024 revenue €15.6B; ~20% of sales in North America; 23 U.S. plants; owns General Cable), 2025. https://en.wikipedia.org/wiki/Prysmian_Group
24. Prysmian Group. North America — company overview (North American revenue ~$6B; ~29 North American plants), 2024–2025. https://na.prysmian.com/company
25. Encore Wire Corporation. Prysmian Completes the Acquisition of Encore Wire, 2024. https://www.encorewire.com/press-releases/2024-07-02-acquisition.html
26. U.S. Securities and Exchange Commission. Encore Wire Corporation Form 8-K Exhibit 99.1 — Transaction Announcement ($290/share; ~€3.9B enterprise value; 8.2× 2023 EBITDA, 6.3× including run-rate synergies), 2024. https://www.sec.gov/Archives/edgar/data/850460/000119312524095443/d809980dex991.htm
27. Encore Wire Corporation. Annual Report (Form 10-K), fiscal year 2023 (copper 80.8% of raw-material value and 52.2% of sales; ASP per copper pound −17.8% vs. copper cost −3.7% with pounds +6.7%; sales $3.018B → $2.568B; gross margin 36.9% → 25.5%; operating margin 30.4% → 17.6%; internal copper rod; 1,629 employees; ~75-day collections; NEC/UL/ASTM/ICEA qualification; competitor set), 2024. https://www.sec.gov/Archives/edgar/data/850460/000085046024000017/wire-20231231.htm
28. Prysmian Group. Prysmian Invests $500 Million to Support Growing Electrification Demand and U.S. Power Grids Through Encore Wire Expansion (>650,000 sq ft; up to 120 jobs), 2025. https://na.prysmian.com/resources/press-releases/prysmian-invests-500-million-dollars-to-support-growing-electrification-demand-and-us-power-grids-through-encore-wire-expansion
29. Wikipedia. Nexans — energy and telecom cable, U.S. operations, 2024–2025. https://en.wikipedia.org/wiki/Nexans
30. Belden Inc. Belden Reports Fourth Quarter and Full Year 2024 Results (revenue ~$2.46B), 2025. https://investor.belden.com/news/news-details/2025/Belden-Reports-Fourth-Quarter-and-Full-Year-2024-Results/
31. Belden Inc. Annual Report (Form 10-K), fiscal year 2025 (metal pass-through timing: distributor lists lag several weeks; OEM provisions lag several weeks to three months), 2026. https://www.sec.gov/Archives/edgar/data/913142/000091314226000009/bdc-20251231.htm
32. Atkore Inc. Annual Report (Form 10-K), fiscal year 2025 (~$3.4B revenue; Electrical segment; AFC Cable Systems), 2025. https://www.sec.gov/Archives/edgar/data/1666138/000162828025054049/atkr-20250930.htm
33. Forbes. Southwire — Company Overview (private; ~$8–9B revenue; ~15% of U.S. wire-and-cable market; acquisitions including Coleman Cable), 2024–2025. https://www.forbes.com/companies/southwire/
34. Wikipedia. Superior Essex (LS Cable & System subsidiary; world's largest magnet-wire producer; U.S. operations), 2024. https://en.wikipedia.org/wiki/Superior_Essex
35. Cerrowire (Marmon / Berkshire Hathaway). Copper and aluminum building wire; plants in AL, GA, IN, UT, 2025. https://www.cerrowire.com/
36. AFL (Fujikura). AFL Announces Multi-Million Dollar Investment and Expansion to Its U.S. Fiber Optic Cable Manufacturing (>$50M, South Carolina), 2024. https://www.aflglobal.com/en/company/company-profile/news/2024/afl-announces-a-multi-million-dollar-investment-and-expansion-to-its-us-fiber-optic-cable
37. Tom's Hardware. AI data centers are consuming fiber optic cable faster than suppliers can make it (5–10× fiber per AI facility; lead times toward a year; 12–24 month capacity additions), 2025. https://www.tomshardware.com/tech-industry/ai-data-centers-are-consuming-fiber-optic-cable-faster-than-suppliers-can-make-it
38. McKinsey & Company. Opportunities in networking optics: boosting supply for data centers (data-center share of global fiber demand under 5% in 2024 toward ~30% by 2027), June 2025. https://www.mckinsey.com/industries/technology-media-and-telecommunications
39. IEEE ComSoc Technology Blog. How will fiber and equipment vendors meet increased demand in 2026 due to AI data center buildouts?, December 2025. https://techblog.comsoc.org/2025/12/23/how-will-fiber-and-equipment-vendors-meet-the-increased-demand-for-fiber-in-2026-due-to-ai-data-center-buildouts/
40. GMI (Global Market Insights). Fiber Optic Cable Market Size (global ~$16B in 2024; U.S. market ~$5–6B), 2025. https://www.gminsights.com/industry-analysis/fiber-optic-cable-market
41. The Pew Charitable Trusts. Demand for Broadband Workforce Expected to Rise to Meet BEAD Requirements ($42.45B program), October 2025. https://www.pew.org/en/research-and-analysis/issue-briefs/2025/10/demand-for-broadband-workforce-expected-to-rise-to-meet-bead-requirements
42. Fiber Broadband Association. The State of North American Fiber Deployment (76.5M homes passed at year-end 2024, +13%, 45.2% adoption; labor and permitting constraints), January 2025. https://fiberbroadband.org/resources/the-state-of-the-north-american-fiber-deployment-january-2025/
43. Federal Communications Commission. Broadband Deployment Report (fiber at 100/20 Mbps available to 63.5M of 115.8M broadband-serviceable locations as of 31 December 2024), 2025. https://docs.fcc.gov/public/attachments/DOC-418459A1.pdf
44. IndexBox (citing U.S. EIA). Metallic cables market forecast — energy transition and grid modernization (U.S. electricity demand ~4,193 TWh in 2025, ~4,283 TWh in 2026), 2025. https://www.indexbox.io/blog/metallic-cables-market-forecast-points-higher-toward-2035-driven-by-energy-transition-and-grid-modernization/
45. S&P Global / CRU. Copper in the Age of AI; US data-center demand drives cable investment (grid spend >$777B this decade; hyperscale copper demand 50,000–110,000 tons/yr in 2026), 2025. https://www.spglobal.com/en/research-insights/special-reports/copper-in-the-age-of-ai
46. U.S. Department of Energy. National Transmission Needs Study (median regional transmission capacity +20% / +64% / +128% by 2035 under three scenarios, vs. the 2020 system), 2023. https://www.energy.gov/sites/default/files/2023-10/National_Transmission_Needs_Study_2023.pdf
47. U.S. Department of Energy / Lawrence Berkeley National Laboratory. DOE Releases New Report Evaluating Increase in Electricity Demand from Data Centers (176 TWh, ~4.4% of U.S. electricity in 2023; 325–580 TWh, ~6.7%–12%, by 2028), 2024. https://www.energy.gov/articles/doe-releases-new-report-evaluating-increase-electricity-demand-data-centers
48. Edison ELM. LME vs. COMEX: copper pricing and the copper-adder / pass-through model in wire & cable, 2025. https://www.edisonelm.com/post/lme-vs-comex-copper-pricing-and-its-impact-on-the-wire-cable-market
49. Investing News Network. What Was the Highest Price for Copper? (COMEX ~$6.71/lb intraday May 2026; +43.93% in 2025), 2026. https://investingnews.com/daily/resource-investing/base-metals-investing/copper-investing/highest-price-for-copper/
50. National Telecommunications and Information Administration. American-Made Internet for All — Build America, Buy America (U.S. manufacturing requirements; ~90% of BEAD equipment spending U.S.-manufactured), 2024. https://www.ntia.gov/blog/2024/american-made-internet-all
51. National Telecommunications and Information Administration. Trump Administration Announces BEAD Program Technology-Neutral Reform, 2025. https://broadbandusa.ntia.gov/news/latest-news/trump-administration-announces-benefit-bargain-bead-program-removes-regulatory
52. CGTN. China imposes anti-dumping duties (~37.9%) on certain U.S. optical fiber goods, September 2025. https://news.cgtn.com/news/2025-09-04/China-imposes-anti-dumping-duties-on-certain-U-S-optical-fiber-goods-1GodLct1sdy/p.html
53. White & Case LLP. President Trump orders 50% Section 232 tariff on copper imports (effective 1 August 2025; cathode, ores and scrap excluded), 2025. https://www.whitecase.com/insight-alert/president-trump-orders-50-percent-section-232-tariff-copper-imports
54. Congressional Research Service. Section 232 National Security Tariffs on Copper Imports (derivative coverage including insulated cable; 25% / 10% U.S.-content rates), 2025. https://www.congress.gov/crs-product/IN12614
55. The White House. Proclamation: Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper Into the United States, June 2026. https://www.whitehouse.gov/presidential-actions/2026/06/further-adjusting-the-tariff-regimes-for-imports-of-aluminum-steel-and-copper-into-the-united-states/