Alliant Energy Corporation
US ˙ NasdaqGS ˙ US0188021085

SecurityLNT / Alliant Energy Corporation
InstitutionAmalgamated Bank
Latest Disclosed Ownership48,355 shares
Latest Disclosed Value $ 3,470
Amalgamated Bank reports 1.59% increase in ownership of LNT / Alliant Energy Corporation

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 48,355 shares of Alliant Energy Corporation (US:LNT) valued at $3,469,955 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 47,599 shares of Alliant Energy Corporation. This represents a change in shares of 1.59% during the quarter. The current value of the position is $3,423,050 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.

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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)
2026-05-08 2026-03-31 13F ALLIANT ENERGY COM 018802108 48,355 756 1.59 3 0.00 0.0266
2026-02-05 2025-12-31 13F ALLIANT ENERGY COM 018802108 47,599 -2,281 -4.57 3 0.00 0.0223
2025-10-29 2025-09-30 13F ALLIANT ENERGY COM 018802108 49,880 -995 -1.96 3 0.00 0.0240
2025-08-04 2025-06-30 13F ALLIANT ENERGY COM 018802108 50,875 1,085 2.18 3 0.00 0.0237
2025-04-25 2025-03-31 13F ALLIANT ENERGY COM 018802108 49,790 403 0.82 3 50.00 0.0274
2025-02-04 2024-12-31 13F ALLIANT ENERGY COM 018802108 49,387 -999 -1.98 3 -33.33 0.0240
2024-10-30 2024-09-30 13F ALLIANT ENERGY COM 018802108 50,386 -1,684 -3.23 3 50.00 0.0252
2024-08-12 2024-06-30 13F ALLIANT ENERGY COM 018802108 52,070 -1,259 -2.36 3 0.00 0.0226
2024-04-23 2024-03-31 13F ALLIANT ENERGY COM 018802108 53,329 -9,297 -14.85 3 -33.33 0.0230
2024-02-06 2023-12-31 13F ALLIANT ENERGY COM 018802108 62,626 -2,446 -3.76 3 0.00 0.0256
2023-11-08 2023-09-30 13F ALLIANT ENERGY COM 018802108 65,072 1,137 1.78 3 0.00 0.0268
2023-08-11 2023-06-30 13F ALLIANT ENERGY COM 018802108 63,935 -795 -1.23 3 0.00 0.0272
2023-05-02 2023-03-31 13F ALLIANT ENERGY COM 018802108 64,730 99 0.15 3 0.00 0.0295
2023-02-10 2022-12-31 13F ALLIANT ENERGY COM 018802108 64,631 -64 -0.10 4 -99.91 0.0318
2022-11-09 2022-09-30 13F ALLIANT ENERGY COM 018802108 64,695 -2,806 -4.16 3,428 -13.35 0.0331
2022-08-15 2022-06-30 13F ALLIANT ENERGY COM 018802108 67,501 4,697 7.48 3,956 0.82 0.0369
2022-08-25 2022-03-31 13F/A-1 ALLIANT ENERGY COM 018802108 62,804 -4,477 -6.65 3,924 -5.13 0.0305
2022-06-30 2022-03-31 13F ALLIANT ENERGY COM 018802108 62,804 -4,477 3,924 0.0312
2022-02-15 2021-12-31 13F/A-1 ALLIANT ENERGY COM 018802108 67,281 -1,850 -2.68 4,136 6.87 0.0305
2022-02-15 2021-12-31 13F ALLIANT ENERGY COM 018802108 67,281 -1,850 4,136 0.0305
2021-10-29 2021-09-30 13F ALLIANT ENERGY COM 018802108 69,131 -2,451 -3.42 3,870 -3.03 0.0327
2021-08-16 2021-06-30 13F ALLIANT ENERGY COM 018802108 71,582 57,939 424.68 3,991 440.05 0.0320
2021-05-13 2021-03-31 13F ALLIANT ENERGY COM 018802108 13,643 -499 -3.53 739 1.37 0.0277
2021-02-12 2020-12-31 13F ALLIANT ENERGY COM 018802108 14,142 -33 -0.23 729 -0.41 0.0276
2020-10-30 2020-09-30 13F ALLIANT ENERGY COM 018802108 14,175 -294 -2.03 732 5.78 0.0318
2020-08-10 2020-06-30 13F ALLIANT ENERGY COM 018802108 14,469 -40,956 -73.89 692 -74.14 0.0320
2020-05-13 2020-03-31 13F ALLIANT ENERGY COM 018802108 55,425 -1,148 -2.03 2,676 -13.57 0.0654
2020-02-13 2019-12-31 13F ALLIANT ENERGY COM 018802108 56,573 6,721 13.48 3,096 15.14 0.0570
2019-11-13 2019-09-30 13F ALLIANT ENERGY COM 018802108 49,852 -822 -1.62 2,689 8.12 0.0565
2019-08-14 2019-06-30 13F ALLIANT ENERGY COM 018802108 50,674 2,482 5.15 2,487 9.51 0.0581
2019-05-15 2019-03-31 13F ALLIANT ENERGY COM 018802108 48,192 970 2.05 2,271 13.83 0.0550
2019-02-15 2018-12-31 13F ALLIANT ENERGY COM 018802108 47,222 325 0.69 1,995 -0.05 0.0565
2018-11-14 2018-09-30 13F ALLIANT ENERGY COM 018802108 46,897 -728 -1.53 1,996 -0.94 0.0494
2018-07-18 2018-06-30 13F ALLIANT ENERGY COM 018802108 47,625 -7 -0.01 2,015 3.55 0.0492
2018-05-22 2018-03-31 13F ALLIANT ENERGY COM 018802108 47,632 -418 -0.87 1,946 -4.93 0.0516
2018-02-13 2017-12-31 13F ALLIANT ENERGY COM 018802108 48,050 3,176 7.08 2,047 9.76 0.0554
2017-11-09 2017-09-30 13F ALLIANT ENERGY COM 018802108 44,874 -9 -0.02 1,865 3.44 0.0581
2017-08-10 2017-06-30 13F ALLIANT ENERGY COM 018802108 44,883 8,601 23.71 1,803 25.47 0.0591
2017-05-12 2017-03-31 13F ALLIANT ENERGY COM 018802108 36,282 869 2.45 1,437 7.08 0.0715
2017-02-14 2016-12-31 13F ALLIANT ENERGY COM 018802108 35,413 4,119 13.16 1,342 11.93 0.0607
2016-11-15 2016-09-30 13F/A-1 ALLIANT ENERGY COM 018802108 31,294 42 0.13 1,199 -2.60 0.0696
2016-08-16 2016-06-30 13F ALLIANT ENERGY COM 018802108 31,252 17,592 128.78 1,231 21.28 0.0712
2016-05-11 2016-03-31 13F ALLIANT ENERGY COM 018802108 13,660 1,171 9.38 1,015 30.13 0.0989
2016-02-10 2015-12-31 13F ALLIANT ENERGY COM 018802108 12,489 -821 -6.17 780 0.13 0.0962
2015-11-04 2015-09-30 13F ALLIANT ENERGY COM 018802108 13,310 126 0.96 779 2.37 0.0817
2015-07-10 2015-06-30 13F ALLIANT ENERGY COM 018802108 13,184 9,858 296.39 761 262.38 0.0747
2015-04-22 2015-03-31 13F ALLIANT ENERGY COM 018802108 3,326 3,326 210 0.0256
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.