Alliant Energy Corporation

Alliant Energy Corporation

LNTยทNASDAQ

$71.39

+0.85%
UtilitiesRegulated Electric

Alliant Energy Corporation operates as a utility holding company that provides regulated electricity and natural gas services. It operates through three segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. The company, through its subsidiary, Interstate Power and Light Company (IPL), primarily generates and distributes electricity, and distributes and transports natural gas to retail customers in Iowa; sells electricity to wholesale customers in Minnesota, Illinois, and Iowa; and generates and distributes steam in Cedar Rapids, Iowa. Alliant Energy Corporation, through its other subsidiary, Wisconsin Power and Light Company (WPL), generates and distributes electricity, and distributes and transports natural gas to retail customers in Wisconsin; and sells electricity to wholesale customers in Wisconsin. As of December 31, 2021, IPL supplied electric and natural gas service to approximately 500,000 and 225,000 retail customers respectively; and WPL supplied electric and natural gas service to approximately 485,000 and 200,000 retail customers, respectively. It serves retail customers in the farming, agriculture, industrial manufacturing, chemical, and packaging and food industries. In addition, the company owns and operates a short-line rail freight service in Iowa; a barge, rail, and truck freight terminal on the Mississippi River; and a rail-served warehouse in Iowa, as well as offers freight brokerage services. Further, it holds interests in a 347 megawatt (MW) natural gas-fired electric generating unit near Sheboygan Falls, Wisconsin; and a 225 MW wind farm located in Oklahoma. The company was incorporated in 1981 and is headquartered in Madison, Wisconsin.

At a Glance

Live Snapshot
Market Cap$18.44B
EPS3.1500
P/E Ratio22.66
Earnings Date08/06/2026

SEC Filings

LNT - Filing history and reports

Filing TypeFiling DatePeriod EndingFiscal YearActions
8-K

8-K 2026

N/A

May 21, 2026
May 20, 2026
2026
10-Q

10-Q 2026 Q1

Q1

May 01, 2026
March 31, 2026
2026
8-K

8-K 2026

N/A

May 01, 2026
April 30, 2026
2026
DEF 14A

DEF 14A 2026

N/A

March 31, 2026
May 20, 2026
2026
8-K

8-K 2026

N/A

March 19, 2026
March 19, 2026
2026
8-K

8-K 2026

N/A

March 04, 2026
March 02, 2026
2026
10-K

10-K 2025 FY

FY

February 20, 2026
December 31, 2025
2025
8-K

8-K 2026

N/A

February 20, 2026
February 19, 2026
2026
8-K

8-K 2026

N/A

January 08, 2026
January 05, 2026
2026
8-K

8-K 2025

N/A

December 16, 2025
December 10, 2025
2025
Showing 1 to 10 of 496 filings

Understanding SEC Filings

Essential regulatory documents for investors

SEC filings are mandatory documents that publicly traded companies must submit to the Securities and Exchange Commission. These reports provide critical insights into a company's financial health, operations, risks, and strategic direction. For investors conducting due diligence, these filings are the most authoritative source of company information.

10-K

Annual Report

Comprehensive annual financial report filed within 60-90 days of fiscal year-end. Includes audited financial statements, management discussion & analysis (MD&A), risk factors, and detailed business operations. The most thorough financial disclosure of the year.

Filed annually
10-Q

Quarterly Report

Unaudited quarterly financial report filed within 40-45 days after each of the first three fiscal quarters. Provides updates on financial position, results of operations, and significant events. Essential for tracking quarterly performance trends.

Filed 3 times per year
8-K

Current Report

Event-driven filing for material events that shareholders should know about, filed within 4 business days. Includes acquisitions, executive changes, bankruptcy, earnings releases, and other significant developments. Critical for staying informed about breaking news.

Filed as events occur
DEF 14A

Proxy Statement

Definitive proxy statement sent to shareholders before annual meetings. Contains executive compensation details, board member information, voting matters, and corporate governance policies. Key for understanding management incentives and board composition.

Filed before shareholder meetings
S-1

Registration Statement

Initial registration for securities offerings, including IPOs. Provides detailed company history, business model, financial statements, risk factors, and use of proceeds. Essential for evaluating new investment opportunities and understanding company fundamentals.

Filed for new offerings
20-F

Foreign Annual Report

Annual report for foreign private issuers, equivalent to Form 10-K for non-U.S. companies. Filed within 4-6 months of fiscal year-end. Contains audited financials, business description, and regulatory disclosures adapted for international companies.

Foreign companies only

Why SEC Filings Matter

  • Regulatory Accuracy: Filings are subject to SEC review and legal penalties for misstatements, ensuring high data quality
  • Management Insights: MD&A sections reveal management's perspective on trends, challenges, and future outlook
  • Risk Assessment: Detailed risk factor disclosures help investors understand potential threats to business operations
  • Competitive Analysis: Business descriptions and segment data enable comparison with industry peers
  • Historical Context: Years of filings provide trend analysis and context for current performance