ALLIANT ENERGY CORP

Ticker: LNT CUSIP: 018802108 Class: COM

VAUGHAN DAVID INVESTMENTS LLC/IL's Holding History (CIK: 0001063571)

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

Q4 2025

Shares 769,972 Value ($000) $50 Avg Close $66.83 Range $64.30 - $69.59

Q3 2025

Shares 768,709 Value ($000) $52 Avg Close $63.88 Range $59.07 - $67.04

Q2 2025

Shares 777,633 Value ($000) $47 Avg Close $60.10 Range $55.76 - $64.19

Q1 2025

Shares 767,906 Value ($000) $49 Avg Close $59.57 Range $54.52 - $64.99

Q4 2024

Shares 763,326 Value ($000) $45 Avg Close $58.37 Range $54.30 - $62.16

Q3 2024

Shares 758,291 Value ($000) $46 Avg Close $54.38 Range $48.12 - $58.63

Q2 2024

Shares 755,661 Value ($000) $38 Avg Close $47.71 Range $44.54 - $49.81

Q1 2024

Shares 741,891 Value ($000) $37 Avg Close $46.11 Range $44.14 - $48.90

Q4 2023

Shares 732,805 Value ($000) $38 Avg Close $46.45 Range $41.77 - $50.29

Q3 2023

Shares 696,526 Value ($000) $34 Avg Close $47.84 Range $44.23 - $51.62

Q2 2023

Shares 665,397 Value ($000) $35 Avg Close $49.05 Range $46.13 - $51.23

Q1 2023

Shares 653,343 Value ($000) $35 Avg Close $48.28 Range $45.19 - $50.77

Q4 2022

Shares 651,783 Value ($000) $36 Avg Close $48.07 Range $42.22 - $51.90

Q3 2022

Shares 639,279 Value ($000) $33,875 Avg Close $53.87 Range $47.25 - $57.82

Q2 2022

Shares 633,099 Value ($000) $37,106 Avg Close $53.50 Range $48.14 - $57.66

Q1 2022

Shares 616,595 Value ($000) $38,525 Avg Close $52.37 Range $48.33 - $55.78

Q4 2021

Shares 609,740 Value ($000) $37,481 Avg Close $50.05 Range $47.35 - $54.07

Q3 2021

Shares 602,936 Value ($000) $33,752 Avg Close $51.28 Range $47.64 - $54.21

Q2 2021

Shares 604,054 Value ($000) $33,682 Avg Close $48.83 Range $45.94 - $51.03

Q1 2021

Shares 588,566 Value ($000) $31,877 Avg Close $42.55 Range $39.42 - $47.06

Q4 2020

Shares 573,604 Value ($000) $29,558 Avg Close $45.61 Range $40.48 - $49.39

Q3 2020

Shares 566,188 Value ($000) $29,244 Avg Close $44.02 Range $39.84 - $46.94

Q2 2020

Shares 561,813 Value ($000) $26,877 Avg Close $40.72 Range $36.29 - $45.31

Q1 2020

Shares 550,328 Value ($000) $26,575 Avg Close $45.48 Range $31.34 - $50.16

Q4 2019

Shares 547,561 Value ($000) $29,963 Avg Close $43.82 Range $42.11 - $45.80

Q3 2019

Shares 549,446 Value ($000) $29,632 Avg Close $42.08 Range $39.53 - $44.83

Q2 2019

Shares 551,685 Value ($000) $27,077 Avg Close $38.79 Range $37.00 - $40.91

Q1 2019

Shares 542,035 Value ($000) $25,546 Avg Close $36.14 Range $32.70 - $38.77

Q4 2018

Shares 544,395 Value ($000) $23,001 Avg Close $35.19 Range $32.65 - $37.38

Q3 2018

Shares 544,120 Value ($000) $23,163 Avg Close $34.13 Range $32.72 - $35.18

Q2 2018

Shares 562,772 Value ($000) $23,817 Avg Close $32.46 Range $30.20 - $34.35

Q1 2018

Shares 552,356 Value ($000) $22,569 Avg Close $30.84 Range $28.88 - $33.21

Q4 2017

Shares 541,171 Value ($000) $23,059 Avg Close $33.80 Range $31.68 - $35.41

Q3 2017

Shares 532,346 Value ($000) $22,130 Avg Close $32.04 Range $30.14 - $33.72

Q2 2017

Shares 537,146 Value ($000) $21,577 Avg Close $30.93 Range $29.83 - $32.31

Q1 2017

Shares 520,996 Value ($000) $20,637 Avg Close $29.08 Range $27.58 - $30.63

Q4 2016

Shares 513,398 Value ($000) $19,453 Avg Close $27.74 Range $26.27 - $29.13

Q3 2016

Shares 506,698 Value ($000) $19,412 Avg Close $29.26 Range $27.72 - $30.41

Q2 2016

Shares 525,653 Value ($000) $20,868 Avg Close $27.46 Range $25.25 - $29.85

Q1 2016

Shares 280,479 Value ($000) $20,834 Avg Close $24.74 Range $22.13 - $27.34

Q4 2015

Shares 281,929 Value ($000) $17,606 Avg Close $21.84 Range $20.45 - $23.41

Q3 2015

Shares 279,229 Value ($000) $16,332 Avg Close $21.20 Range $19.59 - $22.72

Q2 2015

Shares 277,104 Value ($000) $15,994 Avg Close $21.63 Range $20.41 - $22.74

Q1 2015

Shares 274,274 Value ($000) $17,279 Avg Close $23.04 Range $21.25 - $25.01

Q4 2014

Shares 273,424 Value ($000) $18,161 Avg Close $21.73 Range $19.32 - $24.55

Q3 2014

Shares 270,274 Value ($000) $14,976 Avg Close $20.07 Range $19.08 - $21.06

Q2 2014

Shares 275,924 Value ($000) $16,793 Avg Close $19.98 Range $19.02 - $21.06

Q1 2014

Shares 274,084 Value ($000) $15,571 Avg Close $18.07 Range $16.97 - $19.54

Q4 2013

Shares 271,099 Value ($000) $13,989 Avg Close $17.48 Range $16.43 - $18.23

Q3 2013

Shares 266,149 Value ($000) $13,188 Avg Close $17.15 Range $16.21 - $18.15

Q2 2013

Shares 272,999 Value ($000) $13,765 Avg Close $16.89 Range $15.60 - $17.85

Q1 2013

Shares 267,349 Value ($000) $13,416 Avg Close $15.50 Range $14.30 - $16.60

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	769,972	$50	$66.83	$64.30 - $69.59
Q3 2025	768,709	$52	$63.88	$59.07 - $67.04
Q2 2025	777,633	$47	$60.10	$55.76 - $64.19
Q1 2025	767,906	$49	$59.57	$54.52 - $64.99
Q4 2024	763,326	$45	$58.37	$54.30 - $62.16
Q3 2024	758,291	$46	$54.38	$48.12 - $58.63
Q2 2024	755,661	$38	$47.71	$44.54 - $49.81
Q1 2024	741,891	$37	$46.11	$44.14 - $48.90
Q4 2023	732,805	$38	$46.45	$41.77 - $50.29
Q3 2023	696,526	$34	$47.84	$44.23 - $51.62
Q2 2023	665,397	$35	$49.05	$46.13 - $51.23
Q1 2023	653,343	$35	$48.28	$45.19 - $50.77
Q4 2022	651,783	$36	$48.07	$42.22 - $51.90
Q3 2022	639,279	$33,875	$53.87	$47.25 - $57.82
Q2 2022	633,099	$37,106	$53.50	$48.14 - $57.66
Q1 2022	616,595	$38,525	$52.37	$48.33 - $55.78
Q4 2021	609,740	$37,481	$50.05	$47.35 - $54.07
Q3 2021	602,936	$33,752	$51.28	$47.64 - $54.21
Q2 2021	604,054	$33,682	$48.83	$45.94 - $51.03
Q1 2021	588,566	$31,877	$42.55	$39.42 - $47.06
Q4 2020	573,604	$29,558	$45.61	$40.48 - $49.39
Q3 2020	566,188	$29,244	$44.02	$39.84 - $46.94
Q2 2020	561,813	$26,877	$40.72	$36.29 - $45.31
Q1 2020	550,328	$26,575	$45.48	$31.34 - $50.16
Q4 2019	547,561	$29,963	$43.82	$42.11 - $45.80
Q3 2019	549,446	$29,632	$42.08	$39.53 - $44.83
Q2 2019	551,685	$27,077	$38.79	$37.00 - $40.91
Q1 2019	542,035	$25,546	$36.14	$32.70 - $38.77
Q4 2018	544,395	$23,001	$35.19	$32.65 - $37.38
Q3 2018	544,120	$23,163	$34.13	$32.72 - $35.18
Q2 2018	562,772	$23,817	$32.46	$30.20 - $34.35
Q1 2018	552,356	$22,569	$30.84	$28.88 - $33.21
Q4 2017	541,171	$23,059	$33.80	$31.68 - $35.41
Q3 2017	532,346	$22,130	$32.04	$30.14 - $33.72
Q2 2017	537,146	$21,577	$30.93	$29.83 - $32.31
Q1 2017	520,996	$20,637	$29.08	$27.58 - $30.63
Q4 2016	513,398	$19,453	$27.74	$26.27 - $29.13
Q3 2016	506,698	$19,412	$29.26	$27.72 - $30.41
Q2 2016	525,653	$20,868	$27.46	$25.25 - $29.85
Q1 2016	280,479	$20,834	$24.74	$22.13 - $27.34
Q4 2015	281,929	$17,606	$21.84	$20.45 - $23.41
Q3 2015	279,229	$16,332	$21.20	$19.59 - $22.72
Q2 2015	277,104	$15,994	$21.63	$20.41 - $22.74
Q1 2015	274,274	$17,279	$23.04	$21.25 - $25.01
Q4 2014	273,424	$18,161	$21.73	$19.32 - $24.55
Q3 2014	270,274	$14,976	$20.07	$19.08 - $21.06
Q2 2014	275,924	$16,793	$19.98	$19.02 - $21.06
Q1 2014	274,084	$15,571	$18.07	$16.97 - $19.54
Q4 2013	271,099	$13,989	$17.48	$16.43 - $18.23
Q3 2013	266,149	$13,188	$17.15	$16.21 - $18.15
Q2 2013	272,999	$13,765	$16.89	$15.60 - $17.85
Q1 2013	267,349	$13,416	$15.50	$14.30 - $16.60