STEEL DYNAMICS INC
Steel Dynamics, Inc. (SDI) is an American steel producer based in Fort Wayne, Indiana. With a production capacity of 13 million tons of steel, the company is the third largest producer of carbon steel products in the United States. It is among the most profitable American steel companies in terms of profit margins and operating margin per ton. Based on its 2021 revenue, the company ranked 196th on the 2022 edition of the Fortune 500.
Basic company information
Each field links to its source. Financial figures retain their reporting periods; background references are identified in the source list.
- Ticker / security symbols
- STLD [1]
- Listing exchanges
- Nasdaq [1]
- SEC industry
- Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) [1]
- Business sectors
- iron and steel industry [2]
- Company / filing name
- STEEL DYNAMICS INC [1]
- Headquarters location
- Fort Wayne [2]
- Business address
- 7575 W JEFFERSON BLVD, FORT WAYNE, IN, 46804 [1]
- Founded
- 1993 [2]
- Incorporation jurisdiction
- Indiana, United States [1]
- Official website
- www.steeldynamics.com ↗ [2]
- Fiscal year end
- December 31 (SEC record) [1]
- ISIN (reported securities)
- US8581191009 [2]
- CIK
- 0001022671 [1]
- SIC code
- 3312 [1]
- Country in background record
- United States [2]
Company positioning and business
Steel Dynamics, Inc. (SDI) is an American steel producer based in Fort Wayne, Indiana. With a production capacity of 13 million tons of steel, the company is the third largest producer of carbon steel products in the United States. It is among the most profitable American steel companies in terms of profit margins and operating margin per ton. Based on its 2021 revenue, the company ranked 196th on the 2022 edition of the Fortune 500. [3]
Background text: Wikipedia contributors, Steel Dynamics. Selected introductory paragraphs, licensed under CC BY-SA 4.0. Official filing data is cited separately.
Financial year, securities and disclosures
The SEC submissions record gives STEEL DYNAMICS INC a fiscal year end of 1231 (MMDD). Individual filings below identify their own reporting period; the filing date is the publication event, not the financial year end. [1]
Listed securities: STLD (Nasdaq). Multiple symbols may represent different share classes or securities of the same registrant. [4]
History and key events
Financial results and regulatory disclosures
Annual, quarterly and current reports from the collected SEC record. Insider Forms 4 and 144 are excluded. This is a selected list, not a live filing feed.
Source-verified relationships
Companies in the same industry
Comparison candidates share the SEC SIC classification 3312. This does not imply ownership, partnership or trading relationships.
Related entities and concepts
Frequently asked questions
When was STEEL DYNAMICS INC founded?
Founded: 1993. The linked source provides the background record. [2]
Where is the headquarters of STEEL DYNAMICS INC?
Headquarters location: Fort Wayne. The linked source provides the background record. [2]
Which business sectors are recorded for STEEL DYNAMICS INC?
Business sectors: iron and steel industry. The linked source provides the background record. [2]
STEEL DYNAMICS INC relationship map
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2 verified direct relationships. Industry peers are not relationship edges.
Sources and review dates
- SEC — STEEL DYNAMICS INC filing identity and securities ↗
- Wikidata — company background record (CC0) ↗
- Wikipedia contributors — Steel Dynamics (CC BY-SA 4.0) ↗
- SEC securities directory ↗
- Company chronology / filing ↗
Reviewed 23 October 2026. Financial periods and historical event dates are shown separately. Figures reflect their stated source dates; this page is not a live quote or investment recommendation.