Alliant Energy Corporation
US ˙ NasdaqGS ˙ US0188021085

SecurityLNT / Alliant Energy Corporation
InstitutionCohen & Steers, Inc.
Latest Disclosed Ownership3,276,260 shares
Latest Disclosed Value $ 235,104
Cohen & Steers, Inc. reports 9.37% decrease in ownership of LNT / Alliant Energy Corporation

On May 15, 2026 - Cohen & Steers, Inc. filed a 13F-HR form disclosing ownership of 3,276,260 shares of Alliant Energy Corporation (US:LNT) valued at $235,104,418 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,614,890 shares of Alliant Energy Corporation. This represents a change in shares of -9.37% during the quarter. The current value of the position is $231,926,445 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F Alliant Energy COM 018802108 3,276,260 -338,630 -9.37 235 0.00 0.4084
2026-02-13 2025-12-31 13F Alliant Energy COM 018802108 3,614,890 1,063,268 41.67 235 36.63 0.4248
2025-11-14 2025-09-30 13F Alliant Energy COM 018802108 2,551,622 1,605,934 169.82 172 201.75 0.3103
2025-08-14 2025-06-30 13F Alliant Energy COM 018802108 945,688 -1,285,065 -57.61 57 -60.14 0.1049
2025-05-15 2025-03-31 13F Alliant Energy COM 018802108 2,230,753 -75,362 -3.27 144 5.15 0.2653
2025-02-13 2024-12-31 13F Alliant Energy COM 018802108 2,306,115 1,125 0.05 136 -2.16 0.2583
2024-11-14 2024-09-30 13F Alliant Energy COM 018802108 2,304,990 393,072 20.56 140 43.30 0.2489
2024-08-13 2024-06-30 13F Alliant Energy COM 018802108 1,911,918 696,943 57.36 97 59.02 0.2040
2024-05-15 2024-03-31 13F Alliant Energy COM 018802108 1,214,975 -2,436,590 -66.73 61 -67.38 0.1282
2024-02-14 2023-12-31 13F Alliant Energy COM 018802108 3,651,565 213,522 6.21 187 12.65 0.3790
2023-11-14 2023-09-30 13F Alliant Energy COM 018802108 3,438,043 -62,269 -1.78 167 -9.29 0.3830
2023-08-14 2023-06-30 13F Alliant Energy COM 018802108 3,500,312 -38,887 -1.10 184 -2.66 0.3870
2023-05-15 2023-03-31 13F Alliant Energy COM 018802108 3,539,199 458,232 14.87 189 -99.89 0.4083
2023-02-14 2022-12-31 13F Alliant Energy COM 018802108 3,080,967 -121,854 -3.80 170,100 0.23 0.3754
2022-11-14 2022-09-30 13F Alliant Energy COM 018802108 3,202,821 846,660 35.93 169,717 22.90 0.3797
2022-08-15 2022-06-30 13F Alliant Energy COM 018802108 2,356,161 1,727,914 275.04 138,095 251.81 0.2712
2022-05-16 2022-03-31 13F Alliant Energy COM 018802108 628,247 -1,348,046 -68.21 39,253 -67.69 0.0658
2022-02-14 2021-12-31 13F Alliant Energy COM 018802108 1,976,293 7,996 0.41 121,483 10.25 0.1974
2021-11-15 2021-09-30 13F Alliant Energy COM 018802108 1,968,297 -319,418 -13.96 110,185 -13.62 0.2057
2021-08-16 2021-06-30 13F Alliant Energy COM 018802108 2,287,715 -577,647 -20.16 127,563 -17.80 0.2423
2021-05-17 2021-03-31 13F Alliant Energy COM 018802108 2,865,362 152,729 5.63 155,188 11.02 0.3325
2021-02-16 2020-12-31 13F Alliant Energy COM 018802108 2,712,633 -22,685 -0.83 139,782 -1.06 0.3360
2020-11-16 2020-09-30 13F Alliant Energy COM 018802108 2,735,318 -133,257 -4.65 141,279 2.95 0.3761
2020-08-14 2020-06-30 13F Alliant Energy COM 018802108 2,868,575 -42,740 -1.47 137,233 -2.39 0.3830
2020-05-15 2020-03-31 13F Alliant Energy COM 018802108 2,911,315 -175,289 -5.68 140,587 -16.76 0.4537
2020-02-14 2019-12-31 13F Alliant Energy COM 018802108 3,086,604 106,042 3.56 168,899 5.07 0.4202
2019-11-14 2019-09-30 13F Alliant Energy COM 018802108 2,980,562 53,180 1.82 160,742 11.88 0.4028
2019-08-14 2019-06-30 13F Alliant Energy COM 018802108 2,927,382 -47,521 -1.60 143,676 2.47 0.3985
2019-05-15 2019-03-31 13F Alliant Energy COM 018802108 2,974,903 517,086 21.04 140,207 35.02 0.3890
2019-02-14 2018-12-31 13F Alliant Energy COM 018802108 2,457,817 109,829 4.68 103,843 3.89 0.3304
2018-11-16 2018-09-30 13F/A-1 Alliant Energy COM 018802108 2,347,988 127,902 5.76 99,954 6.39 0.2906
2018-11-14 2018-09-30 13F Alliant Energy COM 018802108 2,347,988 127,902 99,954
2018-08-14 2018-06-30 13F Alliant Energy COM 018802108 2,220,086 247,389 12.54 93,954 16.56 0.2691
2018-05-14 2018-03-31 13F Alliant Energy COM 018802108 1,972,697 -41,543 -2.06 80,604 -6.09 0.2465
2018-02-14 2017-12-31 13F Alliant Energy COM 018802108 2,014,240 -151,883 -7.01 85,827 -4.69 0.2372
2017-11-14 2017-09-30 13F Alliant Energy COM 018802108 2,166,123 232,090 12.00 90,046 15.90 0.2457
2017-08-14 2017-06-30 13F Alliant Energy COM 018802108 1,934,033 603,700 45.38 77,690 47.44 0.2060
2017-05-15 2017-03-31 13F Alliant Energy COM 018802108 1,330,333 -156,305 -10.51 52,694 -6.45 0.1410
2017-02-14 2016-12-31 13F Alliant Energy COM 018802108 1,486,638 -100,384 -6.33 56,329 -7.35 0.1556
2016-11-14 2016-09-30 13F Alliant Energy COM 018802108 1,587,022 176,428 12.51 60,799 8.57 0.1559
2016-08-22 2016-06-30 13F/A-2 Alliant Energy COM 018802108 1,410,594 167,614 13.48 56,001 -39.35 0.1449
2016-08-18 2016-06-30 13F/A-1 Alliant Energy COM 018802108 48,341 -1,362,253 3,356 0.0088
2016-08-15 2016-06-30 13F Alliant Energy COM 018802108 1,410,594 56,001
2016-05-16 2016-03-31 13F Alliant Energy COM 018802108 1,242,980 -20,410 -1.62 92,329 17.02 0.2557
2016-02-16 2015-12-31 13F Alliant Energy COM 018802108 1,263,390 -29,486 -2.28 78,899 4.34 0.2267
2015-11-16 2015-09-30 13F Alliant Energy COM 018802108 1,292,876 93,850 7.83 75,620 9.26 0.2289
2015-08-14 2015-06-30 13F Alliant Energy COM 018802108 1,199,026 -347,919 -22.49 69,208 -28.99 0.2100
2015-05-15 2015-03-31 13F Alliant Energy COM 018802108 1,546,945 1,006,903 186.45 97,458 171.70 0.2637
2015-02-17 2014-12-31 13F Alliant Energy COM 018802108 540,042 34,981 6.93 35,870 28.18 0.4958
2014-11-14 2014-09-30 13F Alliant Energy COM 018802108 505,061 -98,632 -16.34 27,985 -23.83 0.0847
2014-08-14 2014-06-30 13F Alliant Energy COM 018802108 603,693 603,693 36,741 0.1052
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.