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ALLIANT ENERGY CORP

For the period ended Sep 30, 2026. Filed Oct 30, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2026 · Filed Oct 30, 2026

LNT$73.46+1.1%Stored close · as of Nov 9, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Table of Contents

Page
Definitions
Forward-looking Statements1
Part I. Financial Information4
Item 1. Condensed Consolidated Financial Statements (Unaudited)4
Alliant Energy Corporation4
Interstate Power and Light Company7
Wisconsin Power and Light Company10
Combined Notes to Condensed Consolidated Financial Statements13
1. Summary of Significant Accounting Policies13
2. Regulatory Matters13
3. Receivables14
4. Investments15
5. Common Equity15
6. Debt18
7. Revenues19
8. Income Taxes20
9. Benefit Plans21
10. Derivative Instruments22
11. Fair Value Measurements23
12. Commitments and Contingencies25
13. Segments of Business27
14. Related Parties29
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations30
Item 3. Quantitative and Qualitative Disclosures About Market Risk40
Item 4. Controls and Procedures40
Part II. Other Information40
Item 1. Legal Proceedings41
Item 1A. Risk Factors41
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds41
Item 5. Other Information41
Item 6. Exhibits42
Signatures42
ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.