ALLIANT ENERGY CORP

Ticker: LNT CUSIP: 018802108 Class: COM

WELLINGTON MANAGEMENT GROUP LLP's Holding History (CIK: 0000902219)

Note: Option positions (PUT/CALL) are excluded.

Q3 2025

Shares 82,537 Value ($000) $5,564 Avg Close $63.88 Range $59.07 - $67.04

Q2 2025

Shares 184,602 Value ($000) $11,163 Avg Close $60.10 Range $55.76 - $64.19

Q1 2025

Shares 281,917 Value ($000) $18,141 Avg Close $59.57 Range $54.52 - $64.99

Q4 2024

Shares 390,932 Value ($000) $23,120 Avg Close $58.37 Range $54.30 - $62.16

Q3 2024

Shares 491,289 Value ($000) $29,816 Avg Close $54.38 Range $48.12 - $58.63

Q2 2024

Shares 1,016,626 Value ($000) $51,746 Avg Close $47.71 Range $44.54 - $49.81

Q1 2024

Shares 990,177 Value ($000) $49,905 Avg Close $46.11 Range $44.14 - $48.90

Q4 2023

Shares 919,041 Value ($000) $47,147 Avg Close $46.45 Range $41.77 - $50.29

Q3 2023

Shares 615,019 Value ($000) $29,798 Avg Close $47.84 Range $44.23 - $51.62

Q2 2023

Shares 487,221 Value ($000) $25,569 Avg Close $49.05 Range $46.13 - $51.23

Q1 2023

Shares 542,249 Value ($000) $28,956 Avg Close $48.28 Range $45.19 - $50.77

Q4 2022

Shares 517,390 Value ($000) $28,565 Avg Close $48.07 Range $42.22 - $51.90

Q3 2022

Shares 606,130 Value ($000) $32,119 Avg Close $53.87 Range $47.25 - $57.82

Q2 2022

Shares 856,532 Value ($000) $50,201 Avg Close $53.50 Range $48.14 - $57.66

Q1 2022

Shares 1,324,613 Value ($000) $82,762 Avg Close $52.37 Range $48.33 - $55.78

Q4 2021

Shares 1,325,011 Value ($000) $81,449 Avg Close $50.05 Range $47.35 - $54.07

Q3 2021

Shares 1,325,452 Value ($000) $74,198 Avg Close $51.28 Range $47.64 - $54.21

Q2 2021

Shares 1,309,904 Value ($000) $73,039 Avg Close $48.83 Range $45.94 - $51.03

Q1 2021

Shares 1,330,838 Value ($000) $72,078 Avg Close $42.55 Range $39.42 - $47.06

Q4 2020

Shares 1,078,456 Value ($000) $55,573 Avg Close $45.61 Range $40.48 - $49.39

Q3 2020

Shares 1,064,245 Value ($000) $54,968 Avg Close $44.02 Range $39.84 - $46.94

Q2 2020

Shares 1,334,214 Value ($000) $63,829 Avg Close $40.72 Range $36.29 - $45.31

Q1 2020

Shares 1,628,194 Value ($000) $78,625 Avg Close $45.48 Range $31.34 - $50.16

Q4 2019

Shares 1,536,547 Value ($000) $84,080 Avg Close $43.82 Range $42.11 - $45.80

Q3 2019

Shares 1,560,752 Value ($000) $84,171 Avg Close $42.08 Range $39.53 - $44.83

Q2 2019

Shares 1,709,916 Value ($000) $83,924 Avg Close $38.79 Range $37.00 - $40.91

Q1 2019

Shares 1,927,714 Value ($000) $90,853 Avg Close $36.14 Range $32.70 - $38.77

Q4 2018

Shares 2,016,394 Value ($000) $85,192 Avg Close $35.19 Range $32.65 - $37.38

Q3 2018

Shares 1,947,048 Value ($000) $82,886 Avg Close $34.13 Range $32.72 - $35.18

Q2 2018

Shares 2,048,311 Value ($000) $86,685 Avg Close $32.46 Range $30.20 - $34.35

Q1 2018

Shares 2,047,450 Value ($000) $83,659 Avg Close $30.84 Range $28.88 - $33.21

Q4 2017

Shares 2,211,441 Value ($000) $94,230 Avg Close $33.80 Range $31.68 - $35.41

Q3 2017

Shares 2,278,789 Value ($000) $94,729 Avg Close $32.04 Range $30.14 - $33.72

Q2 2017

Shares 2,234,068 Value ($000) $89,743 Avg Close $30.93 Range $29.83 - $32.31

Q1 2017

Shares 2,629,143 Value ($000) $104,140 Avg Close $29.08 Range $27.58 - $30.63

Q4 2016

Shares 2,721,875 Value ($000) $103,132 Avg Close $27.74 Range $26.27 - $29.13

Q3 2016

Shares 2,774,305 Value ($000) $106,283 Avg Close $29.26 Range $27.72 - $30.41

Q2 2016

Shares 2,894,968 Value ($000) $114,930 Avg Close $27.46 Range $25.25 - $29.85

Q1 2016

Shares 1,482,342 Value ($000) $110,109 Avg Close $24.74 Range $22.13 - $27.34

Q4 2015

Shares 1,292,695 Value ($000) $80,729 Avg Close $21.84 Range $20.45 - $23.41

Q3 2015

Shares 1,254,576 Value ($000) $73,380 Avg Close $21.20 Range $19.59 - $22.72

Q2 2015

Shares 968,249 Value ($000) $55,888 Avg Close $21.63 Range $20.41 - $22.74

Q1 2015

Shares 1,210,463 Value ($000) $76,259 Avg Close $23.04 Range $21.25 - $25.01

Q4 2014

Shares 1,343,593 Value ($000) $89,241 Avg Close $21.73 Range $19.32 - $24.55

Q3 2014

Shares 1,495,209 Value ($000) $82,850 Avg Close $20.07 Range $19.08 - $21.06

Q2 2014

Shares 1,805,254 Value ($000) $109,868 Avg Close $19.98 Range $19.02 - $21.06

Q1 2014

Shares 1,829,621 Value ($000) $103,941 Avg Close $18.07 Range $16.97 - $19.54

Q4 2013

Shares 2,210,045 Value ($000) $114,038 Avg Close $17.48 Range $16.43 - $18.23

Q3 2013

Shares 2,273,801 Value ($000) $112,667 Avg Close $17.15 Range $16.21 - $18.15

Q2 2013

Shares 2,270,250 Value ($000) $114,466 Avg Close $16.89 Range $15.60 - $17.85

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	82,537	$5,564	$63.88	$59.07 - $67.04
Q2 2025	184,602	$11,163	$60.10	$55.76 - $64.19
Q1 2025	281,917	$18,141	$59.57	$54.52 - $64.99
Q4 2024	390,932	$23,120	$58.37	$54.30 - $62.16
Q3 2024	491,289	$29,816	$54.38	$48.12 - $58.63
Q2 2024	1,016,626	$51,746	$47.71	$44.54 - $49.81
Q1 2024	990,177	$49,905	$46.11	$44.14 - $48.90
Q4 2023	919,041	$47,147	$46.45	$41.77 - $50.29
Q3 2023	615,019	$29,798	$47.84	$44.23 - $51.62
Q2 2023	487,221	$25,569	$49.05	$46.13 - $51.23
Q1 2023	542,249	$28,956	$48.28	$45.19 - $50.77
Q4 2022	517,390	$28,565	$48.07	$42.22 - $51.90
Q3 2022	606,130	$32,119	$53.87	$47.25 - $57.82
Q2 2022	856,532	$50,201	$53.50	$48.14 - $57.66
Q1 2022	1,324,613	$82,762	$52.37	$48.33 - $55.78
Q4 2021	1,325,011	$81,449	$50.05	$47.35 - $54.07
Q3 2021	1,325,452	$74,198	$51.28	$47.64 - $54.21
Q2 2021	1,309,904	$73,039	$48.83	$45.94 - $51.03
Q1 2021	1,330,838	$72,078	$42.55	$39.42 - $47.06
Q4 2020	1,078,456	$55,573	$45.61	$40.48 - $49.39
Q3 2020	1,064,245	$54,968	$44.02	$39.84 - $46.94
Q2 2020	1,334,214	$63,829	$40.72	$36.29 - $45.31
Q1 2020	1,628,194	$78,625	$45.48	$31.34 - $50.16
Q4 2019	1,536,547	$84,080	$43.82	$42.11 - $45.80
Q3 2019	1,560,752	$84,171	$42.08	$39.53 - $44.83
Q2 2019	1,709,916	$83,924	$38.79	$37.00 - $40.91
Q1 2019	1,927,714	$90,853	$36.14	$32.70 - $38.77
Q4 2018	2,016,394	$85,192	$35.19	$32.65 - $37.38
Q3 2018	1,947,048	$82,886	$34.13	$32.72 - $35.18
Q2 2018	2,048,311	$86,685	$32.46	$30.20 - $34.35
Q1 2018	2,047,450	$83,659	$30.84	$28.88 - $33.21
Q4 2017	2,211,441	$94,230	$33.80	$31.68 - $35.41
Q3 2017	2,278,789	$94,729	$32.04	$30.14 - $33.72
Q2 2017	2,234,068	$89,743	$30.93	$29.83 - $32.31
Q1 2017	2,629,143	$104,140	$29.08	$27.58 - $30.63
Q4 2016	2,721,875	$103,132	$27.74	$26.27 - $29.13
Q3 2016	2,774,305	$106,283	$29.26	$27.72 - $30.41
Q2 2016	2,894,968	$114,930	$27.46	$25.25 - $29.85
Q1 2016	1,482,342	$110,109	$24.74	$22.13 - $27.34
Q4 2015	1,292,695	$80,729	$21.84	$20.45 - $23.41
Q3 2015	1,254,576	$73,380	$21.20	$19.59 - $22.72
Q2 2015	968,249	$55,888	$21.63	$20.41 - $22.74
Q1 2015	1,210,463	$76,259	$23.04	$21.25 - $25.01
Q4 2014	1,343,593	$89,241	$21.73	$19.32 - $24.55
Q3 2014	1,495,209	$82,850	$20.07	$19.08 - $21.06
Q2 2014	1,805,254	$109,868	$19.98	$19.02 - $21.06
Q1 2014	1,829,621	$103,941	$18.07	$16.97 - $19.54
Q4 2013	2,210,045	$114,038	$17.48	$16.43 - $18.23
Q3 2013	2,273,801	$112,667	$17.15	$16.21 - $18.15
Q2 2013	2,270,250	$114,466	$16.89	$15.60 - $17.85