LNT · Nasdaq · CIK 0000352541

ALLIANT ENERGY CORP

ALLIANT ENERGY CORP’s most recent SEC filing in our snapshot is a Form 4 filed on Oct 14, 2026. In fiscal 2025 (year ended Dec 31, 2025) it reported revenue of $4.4B and net income of $810.0M, according to its XBRL data on EDGAR. Its EDGAR record lists 40 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$4.4B
Net income, FY2025
$810.0M
Form 4 filings on record, past 12 months
40

Company overview

Legal name (as filed)
ALLIANT ENERGY CORP
Ticker
LNT
SEC Central Index Key (CIK)
0000352541
Industry (SIC)
Electric & Other Services Combined (code 4931)
Business address
MADISON, WI
State or country of incorporation
WI
Fiscal year ends
December 31
SEC filer category
Large accelerated filer
Position in SEC ticker list
#623 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from ALLIANT ENERGY CORP’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$3.7BFY2021$4.2BFY2022$4.0BFY2023$4.0BFY2024$4.4BFY2025
Net income
$674.0MFY2021$686.0MFY2022$703.0MFY2023$690.0MFY2024$810.0MFY2025
LNT annual results
ItemFY2021
ended Dec 31, 2021		FY2022
ended Dec 31, 2022		FY2023
ended Dec 31, 2023		FY2024
ended Dec 31, 2024		FY2025
ended Dec 31, 2025
Revenue$3.7B$4.2B$4.0B$4.0B$4.4B
Net income$674.0M$686.0M$703.0M$690.0M$810.0M
Diluted EPS$2.63$2.73$2.78$2.69$3.14
Total assets$18.6B$20.2B$21.2B$22.7B$25.0B
Cash and equivalents$39.0M$20.0M$62.0M$81.0M$556.0M

XBRL tags used: revenue = Revenues; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashAndCashEquivalentsAtCarryingValue. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

LNT latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Feb 20, 202610-KAnnual report· period Dec 31, 2025Document · Index
Jul 31, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Aug 21, 20268-KOther events· period Aug 21, 2026Document · Index
Mar 31, 2026DEF 14ADefinitive proxy statement· period May 20, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about ALLIANT ENERGY CORP, by form type:

4 ×258-K ×510-Q ×2SCHEDULE 13G ×211-K ×1ARS ×1DEFA14A ×1DEF 14A ×1SCHEDULE 13G/A ×14/A ×1
LNT recent filings
FiledFormWhat it isOriginal
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 9, 2026Document · Index
Aug 21, 20268-KOther events· period Aug 21, 2026Document · Index
Aug 12, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 10, 2026Document · Index
Jul 31, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Jul 31, 20268-KResults of operations· period Jul 30, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jul 14, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 10, 2026Document · Index
Jun 16, 202611-KAnnual report of employee stock plans· period Dec 31, 2025Document · Index
May 21, 20268-KShareholder vote results· period May 20, 2026Document · Index
May 1, 202610-QQuarterly report· period Mar 31, 2026Document · Index
May 1, 20268-KResults of operations· period Apr 30, 2026Document · Index
Apr 29, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
Apr 28, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
Apr 16, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 15, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 10, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 10, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 10, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 10, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 10, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 10, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 10, 2026Document · Index
Mar 31, 2026ARSARS· period Dec 31, 2025Document · Index
Mar 31, 2026DEFA14AAdditional proxy soliciting materialsDocument · Index
Mar 31, 2026DEF 14ADefinitive proxy statement· period May 20, 2026Document · Index
Mar 26, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
Mar 19, 20264/AStatement of changes in beneficial ownership (insider trade)· period Feb 19, 2026Document · Index
Mar 19, 20268-KMaterial agreement· period Mar 19, 2026Document · Index

Insider filing activity

40 Form 4 filings appear in ALLIANT ENERGY CORP’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

Other companies in Electric & Other Services Combined

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0000352541 and XBRL company facts. ALLIANT ENERGY CORP on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.