U.S. Alumina and Aluminum Production and Processing (NAICS 33131): Investor Primer

1. Overview

North American Industry Classification System (NAICS) code 33131 is the five-digit industry that gathers the four steps of turning aluminum into usable industrial forms: refining ore into alumina and smelting it into primary metal (331313), melting scrap back into alloy (331314), flat-rolling metal into sheet, plate and foil (331315), and extruding, drawing and non-flat rolling it into bars, rods, profiles, tube and wire (331318).[1]

The single most important fact for an investor is that, in the United States, this is now overwhelmingly a processing and recycling industry, not a primary-production one. Making metal from ore (331313) accounts for only about 6% of the level's employees; the two rolling-and-extruding children together carry roughly 84% of the employees and 82% of the payroll.[2] The physical metal flows tell the same story: the country produced 660,000 metric tons of primary aluminum in 2025 against 1.31 million tons of smelter nameplate capacity, while recovering an estimated 3.6 million tons from purchased scrap — recycling is now the larger domestic source of metal, and imports supply 60% of apparent consumption.[6] Every child shares one economic engine — customers pay a metal price that flows through, plus a conversion premium for the shaping work — but they differ sharply in size, growth direction, wage intensity, ownership and how you can own a piece of them.

Public investors reach the level through a handful of listed specialists and diversified metals groups; there is no pure play for the level as a whole. Private investors have a far broader menu — whole mills, recyclers, regional extruders, finishing and services businesses, and private credit — concentrated in the more fragmented recycling and extrusion children. Upstream, the private opportunity set has narrowed to a small number of named situations rather than a market.

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

The four children serve different customers with different economics. The table contrasts them; share figures are our federal ground truth (see §3).

Four contrasts stand out:

• Size is inverted from the value chain. The upstream child (331313) is the smallest at home, while the downstream extrusion child (331318) is the largest by both plant count and headcount. The U.S. shape-making base dwarfs its metal-making base — and the gap is widening, because primary capacity has been leaving while extrusion presses and sheet mills are being added.
• Wage intensity flags where the capital and skill sit. Payroll per employee runs roughly $98,000 in sheet/plate/foil (331315) and $95,000 in primary (331313), versus about $78,000 in recycling (331314) and $61,000 in extrusion (331318).[2] Sheet and primary are the technically demanding, high-fixed-cost ends; extrusion supports many smaller, lower-wage shops.
• Ownership mix widens as you move downstream. Primary is a near-oligopoly of three owners; recycling and extrusion are fragmented fields of listed strategics, private-equity platforms and family owners — which is exactly where private capital finds targets.
• Idle capacity is the shared problem, but on different bases. Primary ran at roughly half its nameplate capacity in 2025;[6] the extrusion product market ran at 70.1% in 2023 and 67.7% in the first quarter of 2024, down from 83.5% in 2021;[27] and Rio Tinto reported 88% effective utilization at its Matalco recycling network.[11] These three measures are not comparable — one is national smelter nameplate, one a customs-defined product survey, one a single company — but together they show that the level's spare capacity sits upstream and in extrusion, not in recycling.

Note on sourcing: all four children now have completed primers, and this rollup is drawn from them. Two caveats carry up. First, Census suppression is pervasive below the level: the child primers report no unsuppressed six-digit figure for industry receipts, firm count or concentration for any of the four children, so the level's Economic Census receipts and Herfindahl-Hirschman Index in §3 cannot be checked against a published child breakdown. Second, one child primer refers to aluminum extruders as NAICS 331316, the pre-2022 code; under the 2022 manual used here the extrusion child is 331318.[1]

3. How big it is (the rollup)

Our ground-truth federal statistics for NAICS 33131 are:

The four children's County Business Patterns (CBP) records sum cleanly to this level — 32 + 92 + 80 + 227 = 431 establishments and 3,583 + 5,746 + 18,025 + 30,004 = 57,358 employees — so the rollup is internally consistent, not an approximation.[2] One caveat on the split: the 331313 primer reports that Census publishes no unsuppressed six-digit employment or payroll for that child, so its 3,583 employees are the level extract's allocation rather than an independently published industry figure. The other three children's CBP records are published directly.

What the concentration figures mean. The level's HHI of 500.4 is low — below the roughly 1,500 threshold that U.S. antitrust agencies treat as the start of "moderate" concentration — and the top four firms hold only 38% of receipts. Read plainly: no single firm dominates the whole level. But that aggregate badly understates reality inside the children, and the revised child primers now put numbers on it. Three companies own the six remaining U.S. smelters, and one private refinery operates.[6] Seven producers told the U.S. International Trade Commission (USITC) they accounted for 91.4% of U.S. common-alloy sheet production in 2023 — not a concentration ratio for all of 331315, but strong evidence that individual rolled-product markets are supplied by a very small mill set.[23] Extrusion is the opposite: the USITC identified at least 29 known domestic producers, the Aluminum Extruders Council counts more than 510 presses operating across North America, and the leader, Norsk Hydro, estimates only an 18% North American share.[26][29][24] The level looks unconcentrated precisely because it bundles separately structured markets that rarely compete head-to-head. With 257 firms across 431 establishments, the average operator runs more than one plant, and the top 50 firms already account for 85% of receipts.

Product-market size measures do not add up to the level. The children carry three differently scoped market figures that are useful individually and misleading if combined: the U.S. Geological Survey (USGS) valued 2025 domestic primary aluminum output at about $2.6 billion; the USITC put apparent U.S. consumption of aluminum extrusions at roughly 2.4 million short tons worth $14.9 billion, of which domestic producers supplied 1.3 million short tons worth $8.0 billion, or 53.4% by quantity; and USGS put secondary recovery from purchased scrap at 3.6 million tons.[6][26] These use customs definitions, commodity accounting and NAICS boundaries respectively, and they overlap. Only the $51.142 billion Economic Census receipts figure is a level total.

Undercount and double-count caveats. CBP counts establishments with paid employees; it omits nonemployer and government operations. For this capital-intensive level that omission is minor — there are few one-person aluminum mills — but two boundary effects matter more. First, vertically integrated plants are classified by their primary activity, so an integrated recycle-and-roll mill lands in 331315 rather than 331314; the recycling primer identifies this as its single largest statistical undercount, since USGS scrap-recovery totals include captive recycling inside rolling and extrusion mills. Scrap wholesaling without smelting (423930), commingled-material sorting (562920) and aluminum foundries (331524) sit outside the level entirely.[1] Second, the $51 billion receipts figure double-counts metal that flows from one child to the next (primary metal sold into rolling, for example); it is gross revenue, not value added, and it is inflated by the aluminum price that passes through every invoice. Do not read it as the industry's economic output. Note also that receipts are 2022 while the employment and payroll figures are 2023.

4. Investable universe — where value concentrates

Public value concentrates in the two rolling-and-extruding children (331315 and 331318) and in diversified groups; the upstream primary child offers the most direct commodity exposure but the smallest domestic base. Tickers and exchanges below.

Upstream — primary and alumina (331313). The most direct listed exposures remain Alcoa (New York Stock Exchange (NYSE): AA) and Century Aluminum (Nasdaq: CENX). Century is the closer proxy for domestic smelter economics: its Sebree, Kentucky and Mt. Holly, South Carolina plants produced 217,000 and 161,000 tons in 2025, with Mt. Holly capacity being returned to service — but commodity trader Glencore owned 36.4% of Century at year-end 2025 and accounted for roughly 54% of its consolidated sales, a real governance and counterparty concentration.[7] Alcoa's two U.S. smelters sit inside a global bauxite, alumina and aluminum portfolio, so neither company is a clean read on the child. Domestic capacity is thin: 660,000 tons of primary output against 1.31 million tons of nameplate, with only two of six smelters running at full rate in 2025, two at reduced rates and two shut.[6] The private side has narrowed to three named situations. Atlantic Alumina (Atalco) operates Gramercy, Louisiana — the country's only operating alumina refinery, with capability of about 100,000 tons per month — and announced a $450 million strategic partnership with the U.S. government in early 2026 to secure domestic alumina supply and build the first large-scale U.S. primary gallium circuit.[8] Magnitude 7 Metals holds the idled New Madrid, Missouri smelter and announced in July 2026 a plan to restart one 75,000-ton-per-year potline before year-end; this is an announcement, not operating production.[9] And Century holds a proposed 40% interest in an Emirates Global Aluminium joint venture for a 750,000-ton greenfield smelter at Inola, Oklahoma, with disclosed potential federal support of as much as $500 million — still subject to engineering, a definitive agreement and a competitive long-term power contract, so it should be valued as development optionality.[7] Century's idled Hawesville, Kentucky smelter was sold in February 2026 for $200 million plus a 6.8% interest in the buyer's planned data-center project and will not return as a smelter.[7]

Recycling (331314). No listed pure play exists. Investors gain exposure through diversified strategics — Rio Tinto (NYSE: RIO), which bought half of the Matalco recycling network from the private Giampaolo Group for $700 million (six U.S. plants and one Canadian plant, roughly 900,000 tons of combined capacity, 582,000 tons produced in 2023 at 88% effective utilization); Norsk Hydro (Oslo: NHY), with U.S. recycling and billet plants including Cassopolis, Michigan; and Hindalco (National Stock Exchange of India: HINDALCO) via Novelis, whose recycled content reached 63% of worldwide rolled-product inputs in fiscal 2025.[10][11][21][24] Large private and family recyclers (Real Alloy, with 16 North American production sites and a bankruptcy history worth reading before assuming green tailwinds equal returns; Audubon Metals under Koch Enterprises; Scepter) and a foreign state-backed buyer — Emirates Global Aluminium, which took 80% of Spectro Alloys and its 240 million pounds of annual foundry-alloy capacity — round out the field.[12] Note that Alcoa and Century are poor proxies here: their cost stacks are alumina and electricity, while an independent secondary smelter lives on scrap spreads, yield and conversion cost.

Sheet, plate and foil (331315). The most direct specialist exposures are Kaiser Aluminum (Nasdaq: KALU) (aerospace and engineering plate at Trentwood; packaging sheet at Warrick), which reported record 2025 adjusted EBITDA of $310 million at a margin above 21% measured against conversion revenue rather than metal-inflated sales, and Constellium (NYSE: CSTM), whose 2025 Aerospace & Transportation segment earned a 17% adjusted EBITDA margin versus 7% for its larger Packaging & Automotive Rolled Products segment — a clean illustration of how much mix matters.[17][18] Steel Dynamics (Nasdaq: STLD) is the large new entrant, with a 650,000-tonne Mississippi mill that began commercial shipments in the second half of 2025, though aluminum was only 2% of its consolidated 2025 sales.[22] Foreign strategics Gränges (Nasdaq Stockholm: GRNG) and UACJ (Tokyo: 5741) hold U.S. assets, and Novelis (Hindalco) is a leading rolled-products maker, reporting $18.434 billion of global sales and 3.731 million tonnes of shipments in fiscal 2026.[19] Private-equity owners include Apollo-managed funds, which acquired Arconic in 2023 at an announced enterprise value of approximately $5.2 billion, and American Industrial Partners, which owns the former Aleris Lewisport mill, now Commonwealth Rolled Products.[30][31]

Extrusion and other rolling/drawing (331318). Tredegar (NYSE: TG) offers the purest listed exposure — its Bonnell Aluminum extrusion business was 86% of 2025 consolidated net sales.[25] Norsk Hydro estimates an 18% North American extrusion share across 20 U.S. sites, three Canadian and two Mexican; Kaiser extrudes higher-specification rod, bar, shapes, tube and wire; and Constellium's Automotive Structures & Industry segment was 19% of 2025 revenue at a 5% adjusted EBITDA margin.[24][16][18] The child is dotted with private-equity platforms — Wynnchurch's Astro Shapes, which acquired Star Extruded Shapes — and family owners (MX Holdings/Pennex, National Material's Taber and Tower, Axel Johnson's Brazeway).[32]

Diversified metals or materials exchange-traded funds (ETFs) give only diluted exposure — they also hold miners, steelmakers and unrelated materials companies.

5. How the money works

Across all four children the selling price has the same shape:

London Metal Exchange (LME) aluminum price + regional metal premium + conversion premium.

The metal component is usually passed through to customers, so headline revenue tracks the aluminum price and is a poor measure of economic output. The cleanest demonstration in the children is Kaiser's 2025: net sales rose to $3.37 billion even though shipments fell 5%, because the hedged cost of alloyed metal rose 29% and was passed through — while conversion revenue, the number that actually measures the mill's work, was essentially flat at $1.45 billion.[17] Investors should watch conversion revenue and margin per ton, not sales.

Shared profit levers are utilization (these are high-fixed-cost assets, so lost volume compresses margins fast), scrap spread and metal yield, product mix, energy and consumables, freight, and working capital. The children's own cost stacks show how narrow the operating layer is: Hydro reports that aluminum and labor together are roughly 80%–90% of extrusion cash costs, and the USITC found raw materials ran between 58.7% and 70.8% of reporting extruders' cost of goods sold, with direct labor at 10.0%–13.7% and other factory costs at 19.2%–27.7%.[24][26] Century identifies alumina, electricity, carbon products, labor and other controllable costs as more than 84% of its 2025 cost of goods sold.[7] For Novelis, natural gas and electricity were approximately 98% of energy cost in fiscal 2025.[21]

Where the children diverge is energy and pass-through cushion. Primary smelting (331313) is uniquely exposed: the Hall-Héroult process consumes enormous electricity, the product is a pure commodity, and there is little conversion premium to shelter margins. The scale is concrete — Century expects annual electricity use of 3,372,600 megawatt-hours at Sebree and 3,504,000 at Mt. Holly, so a $1-per-megawatt-hour move changes annual cost by roughly $3.4 million and $3.5 million respectively.[7] The upstream child is also levered to a regional premium the others merely pay: Century's average realized Midwest premium rose to $1,295 per ton in 2025 from $427 in 2024, while its average LME price moved only from $2,419 to $2,630.[7] The three conversion children (331314/331315/331318) are insulated by pass-through and earn on conversion; their fortunes turn on scrap access, utilization and mix rather than the raw metal price.

The children also differ in how their revenue is contracted. Can sheet typically runs on long-term customer agreements, while extrusion is unusually spot-oriented — 62.5% of reported 2022 domestic extrusion shipments were spot sales, against 13.5% under long-term contracts.[26] That, plus 92.8% of shipments made to order on a 30-day average lead time, is why the extrusion child's earnings move faster with the cycle than the sheet child's.[26]

One genuine disagreement across the children is worth flagging: two of them put remelting at roughly 5% of the energy needed to make primary metal (about 95% less), citing Department of Energy material, while the recycling primer carries a USITC estimate of about 8%.[15][14] Either way the advantage is large and the direction is the same; the precise figure depends on scope and boundary. It also does not make recycling energy-free or automatically high-margin — furnaces still burn substantial gas, and competition can hand the benefit to the scrap supplier or the customer rather than the smelter.

6. Demand drivers

End demand is common to the level even though each child levers a different slice. In 2025, USGS put U.S. aluminum consumption at roughly transportation 36%, packaging 24%, building 13%, electrical 9%, consumer durables 8%, machinery 8%, and other 2%; total North American demand rose 0.8% to about 26.65 billion pounds.[6][42]

• Packaging (beverage and food cans) is the most defensive market and supplies clean, uniform can scrap; it favors recycling (331314) and can sheet (331315). Novelis alone reported recycling more than 84 billion used beverage cans in fiscal 2025.[21] It is not immune to cycles — Novelis described can-sheet destocking from the second half of fiscal 2023 into early fiscal 2024 after pandemic-era inventory build.[21]
• Transportation — autos, aerospace, trucks, rail — is larger but cyclical; it drives casting alloys (331314), aerospace plate and automotive sheet (331315), and lightweight structures and electric-vehicle battery enclosures (331318). An Aluminum Association-commissioned automaker survey projects nearly 100 additional pounds of aluminum per North American light vehicle between 2020 and 2030; because it is trade-association-sponsored, treat it as an industry expectation rather than an independent forecast.[42]
• Building and construction drives general-purpose extrusion hardest — Bonnell drew 61% of its 2025 extrusion sales from construction (54% nonresidential, 7% residential) — so 331318 is the most construction-sensitive child.[25]
• Electrical, machinery and industrial investment supports billet, wrought alloys and profiles across the conversion children.

The children are not in the same place in the cycle. North American extrusion demand fell 3.1% in 2025 even as total aluminum demand edged up 0.8%, while the Federal Reserve's real-output index for secondary smelting and alloying jumped to 108.6 in 2025 from 93.0 in 2024.[42][13] Recycling and extrusion are moving in opposite directions right now, and a level-wide demand number hides that.

Scrap supply is itself a demand driver for the recycling and integrated children: old (post-consumer) scrap supplied only about 28% of apparent U.S. consumption in 2025, and the United States exported 2.2 million tons of aluminum scrap while importing 890,000 tons, so improving domestic collection and sorting may matter more to long-run growth than simply adding furnaces.[6] The binding constraint is quality, not just quantity — copper, iron and other residuals accumulate through repeated remelting, so aerospace, electrical and some automotive specifications still require primary metal or very clean segregated scrap.

7. Regulation

Trade policy is the dominant regulatory force across all four children. Since April 6, 2026, most covered aluminum has faced an additional 50% duty under Section 232 of the Trade Expansion Act (assessed on full customs value), with qualifying United Kingdom metal at 25%, Russian metal and products containing Russian-smelted or -cast aluminum at 200%, and specified derivative products at 25% or a temporary 15%.[33][34] A July 20, 2026 proclamation went further, letting approved investors in new or expanded U.S. primary capacity import a matching quantity of primary metal at half the otherwise-applicable rate — a direct attempt to reshore the shrunken 331313 child. It does not reduce duties on imported extrusions or sheet, but it can move domestic billet availability and premiums for the downstream children.[35]

Trade remedies now point in different directions for different children. Antidumping and countervailing duty orders continue to apply to certain common-alloy sheet and foil imports, reinforcing the sheet child's protection.[36] The extrusion child did not get the same outcome: the broad 2024 antidumping and countervailing case covering imports from 14 trading partners ended without new orders after the USITC found no material injury or threat, even though Commerce made affirmative dumping and subsidy findings. Earlier orders on certain Chinese extrusions remain in force separately.[28] An investor should not assume "aluminum tariffs" protect all four children equally.

Environmental and safety rules hit the conversion children through the Environmental Protection Agency (EPA): the aluminum-forming effluent guidelines under Title 40 of the Code of Federal Regulations (CFR) Part 467, and the National Emission Standards for Hazardous Air Pollutants (NESHAP) for secondary aluminum under Part 63, Subpart RRR, covering scrap preparation, dryers, furnaces and fluxing.[37][38] The upstream child carries a regulatory layer the others do not: separate NESHAP requirements for potlines, pitch storage, paste production and anode-bake furnaces, covering hydrogen fluoride, mercury and other hazardous air pollutants, plus perfluorocarbon emissions from anode effects; and bauxite-residue ("red mud") management, for which EPA notes no approved secondary use in the United States.[39][40] Operators across the level also face Occupational Safety and Health Administration (OSHA) requirements for molten metal, cranes, hazardous energy and combustible aluminum dust, plus state air, water and waste permits.[41] Environmental liabilities can survive ownership changes, which makes site diligence central to private transactions.

8. Consolidation

The level is consolidating selectively, and much of the buying is by strategic and private-equity owners rather than through the public market:

• Recycling (331314): Rio Tinto took 50% of Matalco for $700 million; Emirates Global Aluminium took 80% of Spectro Alloys — strategics buying scrap capacity. Meanwhile integrated rolling companies are building their own recycling systems, which increases competition for clean scrap rather than reducing it.[10][12]
• Rolling (331315): Apollo-managed funds acquired Arconic (2023, ~$5.2 billion announced enterprise value); American Industrial Partners acquired the Lewisport mill, now Commonwealth Rolled Products (2020); Kaiser acquired Warrick (2021).[30][31][16]
• Extrusion (331318): private-equity platforms are rolling up regional mills — Wynnchurch's Astro Shapes acquired Star Extruded Shapes — while family groups integrate extrusion with billet, recycling and fabrication. New press installations can also add material capacity without any transaction at all.[32]
• Primary (331313): consolidation is effectively blocked by antitrust and the tiny asset count, so the action is exits and restarts rather than mergers. Century's sale of idled Hawesville to a data-center developer shows that curtailed capacity can leave the industry permanently — and that the scarce input upstream is now electricity, contested by a better-paying buyer.[7]

New capacity is the next competitive question. Steel Dynamics' 650,000-tonne Mississippi mill began commercial shipments in the second half of 2025, and Novelis' 600,000-tonne Bay Minette, Alabama project — roughly $5 billion, and described as the first fully integrated U.S. aluminum mill built in more than 40 years — was scheduled to begin commissioning in the second half of 2026. Together they represent about 1.25 million tonnes of sheet capacity that must find customers and pass qualifications.[22][19] Upstream, the conditional Inola greenfield smelter would add 750,000 tons if it is built.[7] Foreign strategic ownership is pervasive across the level — Hindalco (Novelis), Norsk Hydro, UACJ, Gränges, Rio Tinto and Emirates Global Aluminium all own material U.S. assets — which is why so much of the industry is not visible on a U.S. stock screen.

9. Risks

• Cyclicality: automotive, aerospace, construction and industrial volumes fall together in downturns; the construction-heavy, spot-priced extrusion child (331318) is most exposed, with product-market utilization already down from 83.5% in 2021 to 67.7% in early 2024.[27]
• New supply: ~1.25 million tonnes of new sheet capacity now commissioning or qualifying, plus new extrusion presses, could pressure conversion premiums before demand absorbs it.[22][19]
• Energy and structural competitiveness: high U.S. electricity costs keep the primary child (331313) uncompetitive against imports, and power is increasingly contested by data centers and other large loads; natural gas and power costs squeeze the conversion children.[7]
• Metal-price and pass-through timing: contractual pass-through reduces outright price risk but leaves inventory, premium, scrap-spread and timing exposure — and inflates working capital when prices rise.[17]
• Trade-policy reversal: tariffs support domestic producers but raise downstream costs and remain politically changeable — and, as the 2024 extrusion case showed, protection is not granted uniformly across the children.[28][35]
• Operational outages: fires, furnace failures and mill or press breakdowns can interrupt supply for months. Fires at Novelis' Oswego plant left fiscal-2026 rolled shipments 145,000 tonnes below expectation and reduced adjusted EBITDA by an estimated $104 million.[20]
• Scrap competition and quality: Novelis reported that competition for scrap reduced its metal benefit, and integrated mills building internal recycling bid directly against merchant recyclers for the same clean feedstock.[21]
• Intra-level substitution: secondary metal is a direct substitute for the primary child's output in many applications, so better sorting and scrap utilization is a tailwind for 331314 and a structural headwind for 331313.[6][15]
• Customer, supplier and ownership concentration: losing a can maker, automaker or aerospace program can idle specialized capacity that is hard to redeploy; upstream, Century's 36.4% Glencore ownership and 54% sales dependence is a concentrated counterparty relationship, and a single operating alumina refinery is a national single point of failure.[7][6]
• Environmental and legacy liabilities at older mills, refineries and finishing lines, including bauxite residue upstream and anodizing, coating and remelt residues downstream.[40][38]
• Foreign-listing and governance considerations for the many overseas owners.

10. How to invest and outlook

Public markets. Value concentrates in the conversion children. The most direct listed exposures are Kaiser Aluminum (KALU) and Constellium (CSTM) in sheet and plate, and Tredegar (TG) in extrusion; Steel Dynamics (STLD) is the large new entrant; Alcoa (AA) and Century Aluminum (CENX) are the upstream-commodity plays; and Norsk Hydro (NHY), Rio Tinto (RIO), Hindalco, Gränges and UACJ offer diversified or foreign routes.[16][18][25][22][7][24] There is no pure play for the level. Compare companies on conversion revenue and margin per ton, utilization and yield, product mix, scrap access, capital spending and net debt, and enterprise value (EV) against normalized conversion earnings — not headline sales, which are distorted by metal pass-through; Kaiser's $3.37 billion of 2025 sales against $1.45 billion of conversion revenue is the canonical illustration.[17] Upstream, value on mid-cycle earnings rather than peak metal prices or premiums: the 2024–2025 swing in Century's realized LME price and Midwest premium shows why peak-year multiples mislead.[7] Broad ETFs dilute the exposure.

Private markets. The deepest opportunity set sits in the fragmented recycling (331314) and extrusion (331318) children — independent recyclers, regional extruders, finishing and services businesses, minority co-investments and private credit. Rolling mills (331315) rarely change hands because replacement cost is enormous. Upstream, the private menu is now essentially three named situations — the Gramercy refinery, the announced New Madrid restart and the conditional Inola joint venture — rather than a market.[8][9][7] Diligence should separate metal value from conversion revenue and verify utilization, maintenance backlog, scrap and billet sourcing, customer qualifications, power and gas contracts, working-capital needs and — always — environmental history, with escrows and indemnities. Transaction comparables exist but travel badly: Rio Tinto's $700 million for half of Matalco should not be converted into an industry capacity multiple without adjusting for the Canadian plant, product mix, utilization and the associated commercial arrangements.[10][11]

Outlook. The level's demand backdrop is favorable but its supply picture is getting tougher, and the four children point in different directions — more sharply now than the previous read suggested. Recycling (331314) is the most structurally advantaged, benefiting from a large energy advantage over primary metal and customer decarbonization goals, and its real output rose materially in 2025.[13][15] Sheet (331315) has strong tariff cover but faces roughly 1.25 million tonnes of new domestic capacity that may tighten scrap and pressure premiums during ramp-up.[22][19] Extrusion (331318) is the weak spot near term: demand fell 3.1% in 2025, presses are running around two-thirds utilized, most business is spot-priced, and its 2024 trade case produced no new protection.[42][27][26][28] Primary (331313) remains the wildcard — structurally uncompetitive on power costs, but now the target of reshoring policy with money attached, including a $450 million federal partnership at Gramercy and up to $500 million of potential support for the Inola project, against the counterexample of Hawesville leaving the industry for a data center.[8][7] Across every child, the durable winners share the same traits: secured scrap and billet supply, competitive long-term power, high utilization, differentiated value-added mix and disciplined working capital — not merely ownership of aluminum inventory.

Sources

1. U.S. Census Bureau, 2022 North American Industry Classification System Manual, 2022. https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf
2. U.S. Census Bureau, County Business Patterns: 2023, 2025 (level and child establishment, employment and payroll records). https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Concentration Ratios and Share of Largest Firms (receipts, firm count, CR4/CR8/CR20/CR50, HHI for NAICS 33131), 2025. https://www.census.gov/programs-surveys/economic-census/data/tables.html
4. U.S. Small Business Administration, Table of Small Business Size Standards, 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Geological Survey, Mineral Commodity Summaries 2026, 2026. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026.pdf
6. U.S. Geological Survey, Mineral Commodity Summaries 2026 — Aluminum, 2026. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-aluminum.pdf
7. Century Aluminum Company, 2025 Form 10-K, 2026. https://www.sec.gov/Archives/edgar/data/949157/000162828026013788/cenx-20251231.htm
8. Business Wire, Atlantic Alumina Announces $450 Million Strategic Partnership with United States Government, 2026. https://www.businesswire.com/news/home/20260111484503/en/Atlantic-Alumina-Announces-%24450-Million-Strategic-Partnership-with-United-States-Government
9. Mining Weekly (Reuters), Aluminium Supply Shock Revives Long-Idled Western Smelters, 2026. https://www.miningweekly.com/article/aluminium-supply-shock-revives-long-idled-western-smelters-reuters-says-2026-07-10
10. Rio Tinto, Rio Tinto and Giampaolo Group Complete Matalco Aluminium Recycling Transaction, 2023. https://www.riotinto.com/en/can/news/releases/2023/rio-tinto-and-giampaolo-group-complete-matalco-aluminium-recycling-transaction
11. Rio Tinto, 2024 London Investor Seminar (Matalco capacity, production and utilization), 2024. https://www.riotinto.com/-/media/content/documents/invest/presentations/2024/2024-london-investor-seminar.pdf
12. Emirates Global Aluminium, EGA Completes Acquisition of Majority Stake in Spectro Alloys, 2024. https://media.ega.ae/ega-completes-acquisition-of-majority-stake-in-us-recycling-firm-spectro-alloys/
13. Federal Reserve Bank of St. Louis, Industrial Production: Secondary Smelting and Alloying of Aluminum (NAICS 331314), 2026. https://fred.stlouisfed.org/series/IPN331314A
14. U.S. International Trade Commission, Aluminum: Competitive Conditions Affecting the U.S. Industry, 2017. https://www.usitc.gov/sites/default/files/publications/332/pub4703.pdf
15. U.S. Department of Energy, Alcoa Aluminum Recycling Facility, Better Buildings Solution Center. https://betterbuildingssolutioncenter.energy.gov/showcase-projects/alcoa-aluminum-recycling-facility
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