Alliant Energy Corporation

LNT·NASDAQ·$73.68Share Price as of 11/2·$19BMarket Cap as of 11/2

Financials

10-QQ3 ended 09/30/2610/30/26 10-QQ2 ended 06/30/2607/31/26 10-QQ1 ended 03/31/2605/01/26 10-KFY 202502/20/26 10-QQ3 ended 09/30/2511/07/25

Disclosures

8-KCurrent report10/30/26 8-KCurrent report10/28/26 8-KCurrent report08/21/26 8-KCurrent report07/31/26 8-KCurrent report05/21/26

Prospectuses and Registrations

424B5Prospectus supplement03/19/26 S-8 POSPost-effective amendment (S-8)02/09/26 S-8 POSPost-effective amendment (S-8)02/09/26 S-8 POSPost-effective amendment (S-8)02/09/26 S-8 POSPost-effective amendment (S-8)02/09/26

Proxies

DEF 14ADefinitive proxy03/31/26 DEFA14AAdditional proxy materials03/31/26 PX14A6GLetter to shareholders05/08/25 DEF 14ADefinitive proxy04/01/25 DEFA14AAdditional proxy materials04/01/25

Ownership

Form 4Insider transaction10/14/26 Form 4Insider transaction10/14/26 Form 4Insider transaction10/14/26 Form 4Insider transaction10/14/26 Form 4Insider transaction10/14/26

Other

11-KEmployee stock purchase plan report06/16/26 ARSAnnual report to shareholders03/31/26 11-KEmployee stock purchase plan report06/24/25 ARSAnnual report to shareholders04/01/25 11-KEmployee stock purchase plan report06/20/24