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ALLIANT ENERGY CORP

LISTEDNASDAQ
SYMBOLLNT
SIC4931
STATE OF INC.WI
FISCAL YEAR ENDSDecember 31
CIK352541

ELECTRIC & OTHER SERVICES COMBINED · LARGE ACCELERATED FILER · 10 FISCAL YEARS OF SEC XBRL DATA, 2016–2025

REVENUES, NET INCOME AND FREE CASH FLOW BY FISCAL YEAR$ billions-202462016201720182019202020212022202320242025RevenuesNet incomeFree cash flowEARNINGS AND DIVIDENDS PER SHARE$ per share0.001.002.003.004.002016201720182019202020212022202320242025EPS dilutedDividends per share

Fiscal years labelled by the calendar year in which they end. Bars in $ billions; per-share figures as reported.

CAPITALIZATION 12/31/25

($ millions)Amount%
Total debt12,11662.3
Stockholders' equity7,33437.7
Total capitalization19,450100.0

258,277,037 shares outstanding at 31 March 2026 (cover page of the 10-Q filed 1 May 2026).

LONG-TERM DEBT 12/31/25

($ millions)Amount
Long-term debt, noncurrent10,954
Current maturities1,074
Short-term borrowings / commercial paper88

CAPITAL STOCK 12/31/25

Common shares authorized480,000,000
Common shares issued257,137,261
Par or stated value per share ($)0.01
Outstanding at 3/31/26258,277,037

DIVIDENDS DECLARED/PAID

Fiscal yearPer share $Payout %
20252.0364.6
20241.9271.4
20231.8165.1
20221.7162.6
20211.6161.2

HISTORY AND BUSINESS

HISTORY: Incorporated in Wisconsin. Formerly known as INTERSTATE ENERGY CORP (to 13 May 1999); WPL HOLDINGS INC (to 23 February 1998).

BUSINESS: Classified by the SEC under Standard Industrial Classification 4931, Electric & Other Services Combined. Large accelerated filer. Principal executive office: 4902 North Biltmore Lane, Suite 1000, Madison, WI 53718-2148. Fiscal year ends December 31. For a description of the business, see Item 1 of the latest 10-K.

CONSOLIDATED INCOME ACCOUNT, YEARS ENDED

($ millions)12/31/2512/31/2412/31/23
Operating revenues4,3623,9814,027
Operation and maintenance740676675
Depreciation and amortization846772676
Taxes other than income taxes121122115
Total operating expenses3,3373,0953,084
Operating income1,025886943
Interest charges512449394
Income before income taxes661576707
Income taxes(149)(114)4
Net income810690703
Earned per share, diluted ($)3.142.692.78
Dividends per share ($)2.031.921.81

CONSOLIDATED BALANCE SHEET

($ millions)12/31/2512/31/24
Utility plant, net19,68918,123
Cash and equivalents55681
Total current assets1,6971,184
Regulatory assets2,1192,064
Total assets24,99122,714
Total current liabilities2,1232,715
Long-term debt10,9548,677
Regulatory liabilities1,113959
Common stockholders' equity7,3347,004
Total capitalization and liabilities24,99122,714

TEN-YEAR STATISTICS: FISCAL YEARS ($ millions except per share)

Fiscal year endedRevenuesOper. incomeNet incomeNet margin %EPS diluted $Div. per share $Oper. cash flowCapital expend.Free cash flowTotal assetsTotal liabilitiesTotal debtStockholders' equityROE %Debt / equity
12/31/254,3621,02581018.63.142.031,169––24,99117,657d12,1167,33411.01.65
12/31/243,98188669017.32.691.921,167––22,71415,710d10,4067,0049.91.49
12/31/234,02794370317.52.781.81867––21,23714,460d9,5096,77710.41.40
12/31/224,20592868616.32.731.714861,484(998)20,16313,887d8,7186,27610.91.39
12/31/213,66979567418.42.631.615821,169(587)18,55312,563d7,8835,99011.31.32
12/31/203,41674062418.32.471.525011,366(865)17,71011,822d7,1665,68811.01.26
12/31/193,64877856715.52.331.426601,640(980)16,70111,296d6,5275,20510.91.25
12/31/183,53469452214.82.191.345281,634(1,106)15,42610,640d5,9444,58611.41.30
12/31/173,38267146813.81.991.265221,467(945)14,1889,806d5,1864,18211.21.24
12/31/163,32055438211.51.641.183931,197(804)13,3749,312d4,5644,0629.41.12

Net margin = net income ÷ revenues; ROE = net income ÷ year-end stockholders’ equity; total debt = long-term debt including current maturities plus short-term borrowings/commercial paper, as tagged in XBRL; free cash flow = operating cash flow − purchases of property, plant and equipment; d = derived as total assets − total equity where the filing does not tag total liabilities; – = not reported in XBRL for that year.

REGISTRANT:

ALLIANT ENERGY CORP
CIK 352541 · EIN 39-1380265

PRINCIPAL OFFICE:

4902 North Biltmore Lane, Suite 1000, Madison, WI 53718-2148
Tel.: 608-458-3311

INCORPORATED:

Wisconsin

INDUSTRY (SEC SIC CODE):

4931 · Electric & Other Services Combined

FILER STATUS:

Large accelerated filer

LATEST ANNUAL REPORT:

10-K for period ended 12/31/25, filed 20 February 2026

FORMER NAMES:

ALLIANT ENERGY CORP; INTERSTATE ENERGY CORP; WPL HOLDINGS INC

RECENT FILINGS (ANNUAL REPORT REFERENCES BELOW):

8/21/268-Kperiod 8/21/26
7/31/2610-Qperiod 6/30/26
7/31/268-Kperiod 7/30/26
5/21/268-Kperiod 5/20/26
5/1/2610-Qperiod 3/31/26
5/1/268-Kperiod 4/30/26
3/31/26DEF 14Aperiod 5/20/26
3/19/268-Kperiod 3/19/26

Sources: SEC XBRL company facts (all financial figures) · SEC submissions (registrant, address, SIC, filings) · annual reports: 10-K FY2025 (filed 2/20/26) · 10-K FY2024 (filed 2/21/25) · 10-K FY2023 (filed 2/16/24) · 10-K FY2022 (filed 2/24/23) · 10-K FY2021 (filed 2/18/22) · 10-K FY2020 (filed 2/19/21) · 10-K FY2019 (filed 2/21/20) · 10-K FY2018 (filed 2/22/19). Values are the latest figures filed for each fiscal year (restated where a later 10-K restated them). Ratios and free cash flow are Pathos calculations from those figures. Retrieved 31 October 2026.

Data from SEC filings. © 2026 Pathos Investments · pathosinvestments.com · For educational purposes only. Not investment advice.

Data from SEC filings  ·  Educational only  ·  Not investment advice