Financial reports
10-K
2023 FY
Annual report
16 Feb 24
10-Q
2023 Q3
Quarterly report
3 Nov 23
10-Q
2023 Q2
Quarterly report
4 Aug 23
10-Q
2023 Q1
Quarterly report
5 May 23
ARS
2022 FY
Annual report to shareholders
3 Apr 23
10-K
2022 FY
Annual report
24 Feb 23
10-Q
2022 Q3
Quarterly report
8 Nov 22
10-Q
2022 Q2
Quarterly report
5 Aug 22
10-Q
2022 Q1
Quarterly report
29 Apr 22
10-K
2021 FY
Annual report
18 Feb 22
Current reports
8-K
Departure of Directors or Certain Officers
8 Mar 24
8-K
Wisconsin Power and Light Company Prices Public Offering of Green Bonds
6 Mar 24
8-K
Entry into a Material Definitive Agreement
5 Mar 24
8-K
Alliant Energy Announces 2023 Results
15 Feb 24
8-K
Departure of Directors or Certain Officers
13 Feb 24
8-K
Alliant Energy Finance, LLC Announces Pricing of Senior Notes Offering
13 Nov 23
8-K
Alliant Energy Announces Third Quarter 2023 Results
2 Nov 23
8-K
Departure of Directors or Certain Officers
26 Oct 23
8-K
Interstate Power and Light Company Prices Debt Offering
20 Sep 23
8-K
Alliant Energy Announces Second Quarter 2023 Results
3 Aug 23
Registration and prospectus
S-3ASR
Automatic shelf registration
15 Dec 23
S-3ASR
Automatic shelf registration
6 Nov 23
424B5
Prospectus supplement for primary offering
14 Dec 22
S-3ASR
Automatic shelf registration
15 Dec 20
S-3ASR
Automatic shelf registration
6 Nov 20
S-8
Registration of securities for employees
26 May 20
424B2
Prospectus for primary offering
15 Nov 19
424B5
Prospectus supplement for primary offering
14 Nov 19
S-8
Registration of securities for employees
15 Mar 19
8-A12B
Registration of securities on exchange
28 Dec 18
Proxies
DEFA14A
Additional proxy soliciting materials
3 Apr 23
DEF 14A
Definitive proxy
3 Apr 23
DEFA14A
Additional proxy soliciting materials
30 Mar 22
DEF 14A
Definitive proxy
30 Mar 22
DEFA14A
Additional proxy soliciting materials
1 Apr 21
DEF 14A
Definitive proxy
1 Apr 21
DEFA14A
Additional proxy soliciting materials
9 Apr 20
DEF 14A
Definitive proxy
9 Apr 20
DEF 14A
Definitive proxy
8 Apr 19
DEF 14A
Definitive proxy
9 Apr 18
Other
UPLOAD
Letter from SEC
19 Dec 23
UPLOAD
Letter from SEC
28 Nov 23
CERT
Certification of approval for exchange listing
31 Dec 18
UPLOAD
Letter from SEC
24 Aug 17
CORRESP
Correspondence with SEC
21 Aug 17
UPLOAD
Letter from SEC
10 Aug 17
UPLOAD
Letter from SEC
9 Aug 16
CORRESP
Correspondence with SEC
29 Jul 16
UPLOAD
Letter from SEC
18 Jul 16
NO ACT
No action letter
6 Jan 15