On the Record · Alliant Energy

Alliant Energy acquisitions, on the record

The businesses Alliant Energy bought and sold, as its annual reports describe them, with the cash it reported paying for acquisitions each year and every deal filing since 2016.

Deals its annual reports describe

Business	Deal	When	Value
Whiting Petroleum Corporation Word for word“We have sold certain non-utility subsidiaries such as Whiting Petroleum Corporation (Whiting Petroleum).” 10-K for 2023	divestiture	—	—
West Riverside partial ownership interests (WEC Energy Group, Inc.) Word for word“100 MW were acquired by WEC in June 2023 pursuant to PSCW and FERC approval; additionally, WEC exercised its second and final option to purchase an additional 100 MW, subject to PSCW and FERC approval (a) Madison Gas and Electric Company (MGE) 25 MW were acquired by MGE in March 2023 pursuant to PSCW and FERC approval; additionally, MGE exercised its second and final option to purchase an additional 25 MW, subject to PSCW and FERC approval” 10-K for 2023	divestiture	June 2023	—
Madison Gas and Electric Company (MGE) partial ownership interest in West Riverside Word for word“25 MW were acquired by MGE in March 2023 pursuant to PSCW and FERC approval; additionally, MGE exercised its second and final option to purchase an additional 25 MW, subject to PSCW and FERC approval” 10-K for 2023	divestiture	March 2023	—
West Riverside partial ownership interests Word for word“Upon exercise of such options and the resulting sales, WPL received proceeds from the sales in 2023 and 2024.” 10-K for 2024	divestiture	2023 and 2024	—

Deal filings since 2016

2026-03-19 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2026-03-04 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2025-05-15 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2025-05-09 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2025-03-03 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2024-06-06 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2024-03-05 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2023-11-13 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2023-03-03 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2022-12-15 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2022-03-04 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2022-03-01 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2020-11-23 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2020-03-05 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2019-11-18 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2018-12-17 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2018-06-12 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2018-05-21 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2018-04-30 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2017-05-09 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement
2016-10-07 Form 8-K, Item 1.01: Entry into a Material Definitive Agreement

Read from Alliant Energy’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-20. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.