Alliant Energy
Alliant Energy Corporation (Nasdaq: LNT) is a regulated investor-owned utility holding company focused primarily on providing electric and natural gas service in the Midwest through its public utility subsidiaries, Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL). IPL generates and… From the company’s description.
In fiscal 2025, Alliant Energy reported revenue of $4.36B, up 9.6% from fiscal 2024, and net income of $810.00M. Its operating margin was 23.5%, and operations generated $1.17B in cash. Over the twelve months to Jun 30, 2026, revenue was $4.43B.
Margins and return on equity change in ; everything else in percent. Fewer shares and less debt are shown plainly, not as bad news — it depends what you make of buybacks. Dotted labels explain each measure. is shown separately from the annual figures.
What Alliant Energy does
In the company’s own words
Alliant Energy Corporation (Nasdaq: LNT) is a regulated investor-owned utility holding company focused primarily on providing electric and natural gas service in the Midwest through its public utility subsidiaries, Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL). IPL generates and distributes electricity and distributes and transports natural gas to retail customers in Iowa, while WPL provides those services in Wisconsin; both also sell electricity to wholesale customers. Their retail customers include households, businesses and customers in industries such as agriculture, manufacturing, chemicals, pipeline transportation, packaging, food and data centers. Alliant Energy reports IPL and WPL as its two utility segments, alongside corporate services and non-utility holdings organized under Alliant Energy Finance. Those holdings include a transmission investment, a non-utility wind farm, a leased natural-gas generating facility, supply-chain services and development-ready industrial sites. At December 31, 2025, the company served approximately 1.01 million electric customers and 435,000 natural gas customers, and had 2,948 employees. Its website is www.alliantenergy.com.
Company details
- Sector
- Utilities
- Industry (SIC)
- Electric, Gas & Water
- Headquarters
- MADISON, WI
- Fiscal year end
- December
- CIK
- 352541
- SIC
- 4931
Financial performance, year by year
Fiscal 2013–2025 · USDThe full income statement, balance sheet and cash flow for each of these years — every figure traceable to its filing — is on the Financials tab with a free account.
Who owns Alliant Energy — and what changed
Funds as of 2026Q2 · superinvestors as of 2026-06-30
Largest fund holders · Alliant Energy’s weight in each
Fund ownership is a floor, not a census — pensions, insurers and people holding shares directly are not visible here.
Alliant Energy’s bonds, as funds hold them
Funds report holding 28 issues of Alliant Energy’s debt, $1.27B at market value — what funds hold, not the company’s total debt. Weighted-average coupon 4.50%, maturing 2027 to 2056.
Fund ownership counts N-PORT filers only, so it is a floor rather than a census — pensions, insurers and direct holders are not visible here, and the remainder is not “held by individuals”.
Every fund and institutional holder, quarter by quarter, is on the Ownership tab with a free account.
Recent filings
All filings →Each filing opens into its own statements and disclosures here.
Put this business in context.
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