Largest steel companies in the US: producers, processors and shipments

This list is for anyone who sells to steel mills and processors (scrap, alloys, electrodes, refractories, equipment, maintenance, automation, logistics) and for buyers sizing up suppliers. It ranks US-headquartered public steel companies by revenue in their latest 10-K, adds tons shipped where the filing reports them, and sets them against the US Geological Survey's figures for the whole industry.

The largest US steel companies

Revenue is total revenue or net sales as reported in each company's latest 10-K. Headquarters are each company's business address on its SEC filings. Employees are from the same filing. U.S. Steel and Olympic Steel no longer file, so their rows show their last annual reports and are listed after the current filers.

Two ownership changes reshaped the list. U.S. Steel completed its merger with Nippon Steel North America, a subsidiary of Japan's Nippon Steel, on June 18, 2025, and stopped reporting; the USGS says the approved deal was expected to bring $11 billion of US steelmaking investment through 2028. Ryerson completed its merger with Olympic Steel on February 13, 2026, so Ryerson's 2026 results will include it.

Foreign steelmakers with US mills also file with the SEC: ArcelorMittal (Luxembourg) reported $61.35 billion of 2025 sales worldwide, and Gerdau (Brazil) reported R$69.86 billion, with 6,614 employees in North America.

Who ships the most steel

Revenue mixes steel with other products, so tons are the better measure of steelmaking size. From the companies' 10-Ks:

Nucor, Cleveland-Cliffs and Steel Dynamics together shipped about 55.2 million tons in 2025. That's about 50.1 million metric tons, or roughly 61% of the 82 million metric tons of steel mill products the USGS estimates were shipped in the US (our rough comparison; the companies' totals include some shipments from outside the US and to their own downstream plants).

The US steel industry in numbers

The USGS Mineral Commodity Summaries 2026 gives the national picture for 2025 (in metric tons):

Where the steel goes, by share of net shipments: construction 31%, steel service centers and distributors 26%, automotive 15%, converting and processing 11% and everything else 17%. Integrated mills, which need coke from ovens like SunCoke's, account for about 28% of production. County Business Patterns counts 359 iron and steel mill establishments with 78,532 employees in 2023, of which 13 have 1,000 or more.

Trade policy is part of the picture: the USGS notes that Section 232 tariffs on imported steel rose to 25% for all countries in March 2025 and to 50% in June 2025.

How this list is built

• What's counted: total revenue or net sales for each company's latest fiscal year, as reported in its 10-K, and steel shipments where the 10-K reports them.
• Who's counted: US-headquartered SEC filers that make, process or distribute steel, including service centers (Reliance, Ryerson, Worthington Steel) and specialty alloy makers (ATI, Carpenter), which also make titanium and nickel alloys.
• What's left out: privately held steelmakers and processors, which don't publish results, and foreign-headquartered groups, which are noted above. The World Steel Association and trade publications rank producers by tonnage worldwide; we didn't use them.

Where the buying happens at a steel company

General guidance, informed by the filings and USGS data.

• The mill. Melt shop, rolling mill and maintenance managers buy electrodes, refractories, rolls, spare parts and repair services. Nucor alone runs 15 bar mills, so a multi-mill company buys mill by mill even under a corporate agreement.
• Raw materials procurement. Scrap, pig iron, alloys and, for integrated mills, coke and iron ore are bought centrally by commodity teams, often on long contracts.
• Capital projects. New mills and expansions, such as Nucor's sheet mill in Mason County, West Virginia, and its rebar micro mill in Lexington, North Carolina, run through engineering and project teams years before they start up.
• Service centers buy steel from the mills and sell processing (cutting, slitting, finishing) to manufacturers and contractors, so they're both customers and channels.

Worked example: a maintenance services firm targets minimills

Illustrative example. The firm and its pricing are fictional; the mill counts come from the USGS and Nucor's 10-K.

The seller: Hotstrip (hotstrip.example), an industrial maintenance contractor in the Midwest, offers planned-outage support for electric arc furnace mills at an illustrative $300,000 per mill per year.

The market. There are 102 minimills run by 47 companies, and Indiana and Ohio together produce about 27% of US raw steel. Hotstrip can reach mills within a day's drive of its base in northern Indiana.

The arithmetic. If an illustrative 20 minimills are within reach and Hotstrip wins five, that's $1.5 million a year (5 × $300,000). Each extra mill is another $300,000, so a single multi-mill customer that adds two sister mills is worth $900,000.

The plan.

1. List the mills, not the companies. Most steelmakers' 10-Ks list their mills and locations under Item 2, Properties.
2. Start with the maintenance or reliability manager at each mill, who schedules outages, and the mill's procurement lead.
3. Time the approach to outage planning, since mills plan major maintenance months ahead.

Finding the maintenance and reliability managers at 20 mills, and what's changed at each, is the slow part. Bebop researches each account in a list like this and writes a playbook for it.

Next step: for the manufacturers that buy steel from these mills and service centers, see the biggest manufacturing companies.