ALLIANT ENERGY CORP

Ticker: LNT CUSIP: 018802108 Class: COM

MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s Holding History (CIK: 0000912938)

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

Q4 2025

Shares 7,173,906 Value ($000) $466,376 Avg Close $66.83 Range $64.30 - $69.59

Q3 2025

Shares 7,006,325 Value ($000) $472,296 Avg Close $63.88 Range $59.07 - $67.04

Q2 2025

Shares 7,082,060 Value ($000) $428,252 Avg Close $60.10 Range $55.76 - $64.19

Q1 2025

Shares 6,697,856 Value ($000) $431,007 Avg Close $59.57 Range $54.52 - $64.99

Q4 2024

Shares 7,012,572 Value ($000) $414,724 Avg Close $58.37 Range $54.30 - $62.16

Q3 2024

Shares 6,512,770 Value ($000) $395,260 Avg Close $54.38 Range $48.12 - $58.63

Q2 2024

Shares 6,000,341 Value ($000) $305,417 Avg Close $47.71 Range $44.54 - $49.81

Q1 2024

Shares 6,068,025 Value ($000) $305,828 Avg Close $46.11 Range $44.14 - $48.90

Q4 2023

Shares 4,802,777 Value ($000) $246,382 Avg Close $46.45 Range $41.77 - $50.29

Q3 2023

Shares 2,854,292 Value ($000) $138,290 Avg Close $47.84 Range $44.23 - $51.62

Q2 2023

Shares 2,920,011 Value ($000) $153,242 Avg Close $49.05 Range $46.13 - $51.23

Q1 2023

Shares 2,951,892 Value ($000) $157,631 Avg Close $48.28 Range $45.19 - $50.77

Q4 2022

Shares 2,969,774 Value ($000) $163,961 Avg Close $48.07 Range $42.22 - $51.90

Q3 2022

Shares 1,275,019 Value ($000) $67,564 Avg Close $53.87 Range $47.25 - $57.82

Q2 2022

Shares 1,275,140 Value ($000) $74,736 Avg Close $53.50 Range $48.14 - $57.66

Q1 2022

Shares 1,554,245 Value ($000) $97,109 Avg Close $52.37 Range $48.33 - $55.78

Q4 2021

Shares 1,934,827 Value ($000) $118,933 Avg Close $50.05 Range $47.35 - $54.07

Q3 2021

Shares 2,122,672 Value ($000) $118,827 Avg Close $51.28 Range $47.64 - $54.21

Q2 2021

Shares 2,187,613 Value ($000) $121,981 Avg Close $48.83 Range $45.94 - $51.03

Q1 2021

Shares 2,160,259 Value ($000) $116,999 Avg Close $42.55 Range $39.42 - $47.06

Q4 2020

Shares 1,651,621 Value ($000) $85,107 Avg Close $45.61 Range $40.48 - $49.39

Q3 2020

Shares 1,445,839 Value ($000) $74,677 Avg Close $44.02 Range $39.84 - $46.94

Q2 2020

Shares 1,260,534 Value ($000) $60,305 Avg Close $40.72 Range $36.29 - $45.31

Q1 2020

Shares 819,427 Value ($000) $39,570 Avg Close $45.48 Range $31.34 - $50.16

Q4 2019

Shares 297,264 Value ($000) $16,266 Avg Close $43.82 Range $42.11 - $45.80

Q3 2019

Shares 405,622 Value ($000) $21,875 Avg Close $42.08 Range $39.53 - $44.83

Q2 2019

Shares 395,734 Value ($000) $19,423 Avg Close $38.79 Range $37.00 - $40.91

Q1 2019

Shares 382,610 Value ($000) $18,032 Avg Close $36.14 Range $32.70 - $38.77

Q4 2018

Shares 389,174 Value ($000) $16,442 Avg Close $35.19 Range $32.65 - $37.38

Q3 2018

Shares 565,763 Value ($000) $24,085 Avg Close $34.13 Range $32.72 - $35.18

Q2 2018

Shares 836,532 Value ($000) $35,402 Avg Close $32.46 Range $30.20 - $34.35

Q1 2018

Shares 888,596 Value ($000) $36,308 Avg Close $30.84 Range $28.88 - $33.21

Q4 2017

Shares 1,139,760 Value ($000) $48,566 Avg Close $33.80 Range $31.68 - $35.41

Q3 2017

Shares 1,084,795 Value ($000) $45,094 Avg Close $32.04 Range $30.14 - $33.72

Q2 2017

Shares 1,150,670 Value ($000) $46,223 Avg Close $30.93 Range $29.83 - $32.31

Q1 2017

Shares 1,096,060 Value ($000) $43,414 Avg Close $29.08 Range $27.58 - $30.63

Q4 2016

Shares 1,090,557 Value ($000) $41,321 Avg Close $27.74 Range $26.27 - $29.13

Q3 2016

Shares 1,070,723 Value ($000) $41,021 Avg Close $29.26 Range $27.72 - $30.41

Q2 2016

Shares 1,043,357 Value ($000) $41,421 Avg Close $27.46 Range $25.25 - $29.85

Q1 2016

Shares 634,740 Value ($000) $47,148 Avg Close $24.74 Range $22.13 - $27.34

Q4 2015

Shares 884,255 Value ($000) $55,222 Avg Close $21.84 Range $20.45 - $23.41

Q3 2015

Shares 801,019 Value ($000) $46,853 Avg Close $21.20 Range $19.59 - $22.72

Q2 2015

Shares 785,829 Value ($000) $45,358,051 Avg Close $21.63 Range $20.41 - $22.74

Q1 2015

Shares 413,452 Value ($000) $26,047,476 Avg Close $23.04 Range $21.25 - $25.01

Q4 2014

Shares 593,981 Value ($000) $39,452,218 Avg Close $21.73 Range $19.32 - $24.55

Q3 2014

Shares 799,598 Value ($000) $44,307 Avg Close $20.07 Range $19.08 - $21.06

Q2 2014

Shares 1,161,178 Value ($000) $70,670 Avg Close $19.98 Range $19.02 - $21.06

Q1 2014

Shares 2,109,405 Value ($000) $119,835,298 Avg Close $18.07 Range $16.97 - $19.54

Q4 2013

Shares 2,027,585 Value ($000) $104,623,386 Avg Close $17.48 Range $16.43 - $18.23

Q3 2013

Shares 1,701,224 Value ($000) $84,295,649 Avg Close $17.15 Range $16.21 - $18.15

Q2 2013

Shares 1,797,865 Value ($000) $90,648,354 Avg Close $16.89 Range $15.60 - $17.85

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	7,173,906	$466,376	$66.83	$64.30 - $69.59
Q3 2025	7,006,325	$472,296	$63.88	$59.07 - $67.04
Q2 2025	7,082,060	$428,252	$60.10	$55.76 - $64.19
Q1 2025	6,697,856	$431,007	$59.57	$54.52 - $64.99
Q4 2024	7,012,572	$414,724	$58.37	$54.30 - $62.16
Q3 2024	6,512,770	$395,260	$54.38	$48.12 - $58.63
Q2 2024	6,000,341	$305,417	$47.71	$44.54 - $49.81
Q1 2024	6,068,025	$305,828	$46.11	$44.14 - $48.90
Q4 2023	4,802,777	$246,382	$46.45	$41.77 - $50.29
Q3 2023	2,854,292	$138,290	$47.84	$44.23 - $51.62
Q2 2023	2,920,011	$153,242	$49.05	$46.13 - $51.23
Q1 2023	2,951,892	$157,631	$48.28	$45.19 - $50.77
Q4 2022	2,969,774	$163,961	$48.07	$42.22 - $51.90
Q3 2022	1,275,019	$67,564	$53.87	$47.25 - $57.82
Q2 2022	1,275,140	$74,736	$53.50	$48.14 - $57.66
Q1 2022	1,554,245	$97,109	$52.37	$48.33 - $55.78
Q4 2021	1,934,827	$118,933	$50.05	$47.35 - $54.07
Q3 2021	2,122,672	$118,827	$51.28	$47.64 - $54.21
Q2 2021	2,187,613	$121,981	$48.83	$45.94 - $51.03
Q1 2021	2,160,259	$116,999	$42.55	$39.42 - $47.06
Q4 2020	1,651,621	$85,107	$45.61	$40.48 - $49.39
Q3 2020	1,445,839	$74,677	$44.02	$39.84 - $46.94
Q2 2020	1,260,534	$60,305	$40.72	$36.29 - $45.31
Q1 2020	819,427	$39,570	$45.48	$31.34 - $50.16
Q4 2019	297,264	$16,266	$43.82	$42.11 - $45.80
Q3 2019	405,622	$21,875	$42.08	$39.53 - $44.83
Q2 2019	395,734	$19,423	$38.79	$37.00 - $40.91
Q1 2019	382,610	$18,032	$36.14	$32.70 - $38.77
Q4 2018	389,174	$16,442	$35.19	$32.65 - $37.38
Q3 2018	565,763	$24,085	$34.13	$32.72 - $35.18
Q2 2018	836,532	$35,402	$32.46	$30.20 - $34.35
Q1 2018	888,596	$36,308	$30.84	$28.88 - $33.21
Q4 2017	1,139,760	$48,566	$33.80	$31.68 - $35.41
Q3 2017	1,084,795	$45,094	$32.04	$30.14 - $33.72
Q2 2017	1,150,670	$46,223	$30.93	$29.83 - $32.31
Q1 2017	1,096,060	$43,414	$29.08	$27.58 - $30.63
Q4 2016	1,090,557	$41,321	$27.74	$26.27 - $29.13
Q3 2016	1,070,723	$41,021	$29.26	$27.72 - $30.41
Q2 2016	1,043,357	$41,421	$27.46	$25.25 - $29.85
Q1 2016	634,740	$47,148	$24.74	$22.13 - $27.34
Q4 2015	884,255	$55,222	$21.84	$20.45 - $23.41
Q3 2015	801,019	$46,853	$21.20	$19.59 - $22.72
Q2 2015	785,829	$45,358,051	$21.63	$20.41 - $22.74
Q1 2015	413,452	$26,047,476	$23.04	$21.25 - $25.01
Q4 2014	593,981	$39,452,218	$21.73	$19.32 - $24.55
Q3 2014	799,598	$44,307	$20.07	$19.08 - $21.06
Q2 2014	1,161,178	$70,670	$19.98	$19.02 - $21.06
Q1 2014	2,109,405	$119,835,298	$18.07	$16.97 - $19.54
Q4 2013	2,027,585	$104,623,386	$17.48	$16.43 - $18.23
Q3 2013	1,701,224	$84,295,649	$17.15	$16.21 - $18.15
Q2 2013	1,797,865	$90,648,354	$16.89	$15.60 - $17.85