Alliant Energy (LNT) SEC Filings: History & Chart

Alliant Energy Corporation(LNT)

Regulated Electric · Madison, WI

$67.86+0.00 (+0.00%)

Delayed quote: Sep 9, 2026, 4:00 PM EDT

About Alliant Energy Corporation

Alliant Energy Corporation functions as a utility holding company, specializing in the provision of regulated electricity and natural gas services. Its operational structure is divided into three principal segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. Through its primary subsidiary, Interstate Power and Light Company (IPL), the corporation generates and distributes electricity, and manages the distribution and transportation of natural gas to retail customers throughout Iowa. IPL also markets electricity to wholesale buyers across Minnesota, Illinois, and Iowa, and generates and supplies steam in Cedar Rapids, Iowa. Similarly, its other subsidiary, Wisconsin Power and Light Company (WPL), is responsible for electricity generation and distribution, alongside natural gas distribution and transport, for retail clients within Wisconsin. WPL additionally sells wholesale electricity in Wisconsin. As of December 31, 2021, IPL catered to approximately 500,000 retail electric customers and 225,000 natural gas customers, while WPL provided services to about 485,000 retail electric accounts and 200,000 natural gas accounts. The company's diverse retail customer base includes businesses in farming, agriculture, industrial manufacturing, chemical production, packaging, and food processing. In addition to its core utility functions, Alliant Energy owns and operates a short-line rail freight service, a multi-modal freight terminal (encompassing barge, rail, and truck operations) on the Mississippi River, and a rail-served warehouse, all located in Iowa. It further provides freight brokerage services. The company also maintains interests in a 347-megawatt (MW) natural gas-fueled electric generating unit situated near Sheboygan Falls, Wisconsin, and a 225 MW wind farm located in Oklahoma. Alliant Energy Corporation was established in 1981 and maintains its headquarters in Madison, Wisconsin.

Madison, WI

2,948 employees

www.alliantenergy.com

Utilities / Regulated Electric

Sector: Utilities
Industry: Regulated Electric
CEO: Lisa Barton

View full financials

Form	Filing Date	Accepted	Document
8-K	Aug 21, 2026	Aug 21, 2026	View filing
4	Aug 12, 2026	Aug 12, 2026	View filing
10-Q	Jul 31, 2026	Jul 31, 2026	View filing
8-K	Jul 31, 2026	Jul 30, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
4	Jul 14, 2026	Jul 14, 2026	View filing
11-K	Jun 16, 2026	Jun 16, 2026	View filing
8-K	May 21, 2026	May 21, 2026	View filing
10-Q	May 1, 2026	May 1, 2026	View filing
SC 13G	Apr 29, 2026	Apr 29, 2026	View filing
SC 13G	Apr 28, 2026	Apr 28, 2026	View filing
4	Apr 16, 2026	Apr 16, 2026	View filing
4	Apr 14, 2026	Apr 14, 2026	View filing
4	Apr 14, 2026	Apr 14, 2026	View filing
4	Apr 14, 2026	Apr 14, 2026	View filing
4	Apr 14, 2026	Apr 14, 2026	View filing
4	Apr 14, 2026	Apr 14, 2026	View filing
4	Apr 14, 2026	Apr 14, 2026	View filing
4	Apr 14, 2026	Apr 14, 2026	View filing
DEFA14A	Mar 31, 2026	Mar 30, 2026	View filing
DEF 14A	Mar 31, 2026	Mar 30, 2026	View filing
SC 13G/A	Mar 26, 2026	Mar 26, 2026	View filing
8-K	Mar 19, 2026	Mar 19, 2026	View filing
424B5	Mar 19, 2026	Mar 19, 2026	View filing

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