Ameren Corporation
US ˙ NYSE ˙ US0236081024

SecurityAEE / Ameren Corporation
InstitutionFirst Manhattan Co
Latest Disclosed Ownership60,047 shares
Latest Disclosed Value $ 6,600,366
First Manhattan Co ownership in AEE / Ameren Corporation

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 60,047 shares of Ameren Corporation (US:AEE) valued at $6,600,366 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 60,047 shares of Ameren Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $6,378,793 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)
2026-05-15 2026-03-31 13F AMEREN COM 023608102 60,047 0 0.00 6,600 10.07 0.0183
2026-02-17 2025-12-31 13F AMEREN COM 023608102 60,047 -3,220 -5.09 5,996 -9.19 0.0157
2025-11-14 2025-09-30 13F AMEREN COM 023608102 63,267 300 0.48 6,604 9.19 0.0174
2025-08-14 2025-06-30 13F AMEREN COM 023608102 62,967 -975 -1.52 6,047 -5.80 0.0171
2025-05-15 2025-03-31 13F AMEREN COM 023608102 63,942 -1,350 -2.07 6,420 10.29 0.0187
2025-02-14 2024-12-31 13F AMEREN COM 023608102 65,292 0 0.00 5,820 1.93 0.0171
2024-11-14 2024-09-30 13F AMEREN COM 023608102 65,292 -750 -1.14 5,710 21.59 0.0169
2024-08-15 2024-06-30 13F/A-1 AMEREN COM 023608102 66,042 -650 -0.97 4,696 -4.79 0.0151
2024-08-14 2024-06-30 13F AMEREN COM 023608102 66,042 -650 4,696 0.0151
2024-05-15 2024-03-31 13F AMEREN COM 023608102 66,692 0 0.00 4,933 2.24 0.0160
2024-02-13 2023-12-31 13F AMEREN COM 023608102 66,692 -3,735 -5.30 4,824 -8.46 0.0167
2023-11-14 2023-09-30 13F AMEREN COM 023608102 70,427 -200 -0.28 5,270 -8.63 0.0195
2023-08-14 2023-06-30 13F AMEREN COM 023608102 70,627 -1,840 -2.54 5,768 -7.86 0.0211
2023-05-15 2023-03-31 13F AMEREN COM 023608102 72,467 -161,003 -68.96 6,260 -69.85 0.0240
2023-02-14 2022-12-31 13F AMEREN COM 023608102 233,470 22,387 10.61 20,760 22.10 0.0761
2022-11-14 2022-09-30 13F AMEREN COM 023608102 211,083 -2,200 -1.03 17,002 -11.78 0.0720
2022-08-15 2022-06-30 13F AMEREN COM 023608102 213,283 -1,600 -0.74 19,272 -4.34 0.0777
2022-05-16 2022-03-31 13F AMEREN COM 023608102 214,883 0 0.00 20,147 5.34 0.0659
2022-02-14 2021-12-31 13F AMEREN COM 023608102 214,883 -1,700 -0.78 19,126 9.02 0.0630
2021-11-15 2021-09-30 13F AMEREN COM 023608102 216,583 -101,536 -31.92 17,543 -31.10 0.0646
2021-08-16 2021-06-30 13F AMEREN COM 023608102 318,119 -6,225 -1.92 25,462 -3.51 0.0929
2021-05-14 2021-03-31 13F AMEREN COM 023608102 324,344 -147,376 -31.24 26,388 -28.34 0.1137
2021-02-16 2020-12-31 13F AMEREN COM 023608102 471,720 -6,148 -1.29 36,822 -2.56 0.1762
2020-11-12 2020-09-30 13F AMEREN COMMON 023608102 477,868 -130,718 -21.48 37,789 -11.75 0.1947
2020-08-14 2020-06-30 13F AMEREN COMMON 023608102 608,586 -23,770 -3.76 42,820 -7.02 0.2475
2020-05-06 2020-03-31 13F AMEREN COMMON 023608102 632,356 -33,320 -5.01 46,054 -9.92 0.2985
2020-02-13 2019-12-31 13F AMEREN COMMON 023608102 665,676 -52,228 -7.28 51,123 -11.04 0.2565
2019-11-13 2019-09-30 13F AMEREN COMMON 023608102 717,904 -5,022 -0.69 57,468 5.84 0.3166
2019-08-16 2019-06-30 13F AMEREN COMMON 023608102 722,926 -6,550 -0.90 54,299 1.21 0.3014
2019-04-12 2019-03-31 13F AMEREN COMMON 023608102 729,476 -11,490 -1.55 53,652 11.00 0.3097
2019-01-30 2018-12-31 13F AMEREN COMMON 023608102 740,966 -11,690 -1.55 48,333 1.58 0.3009
2018-10-15 2018-09-30 13F AMEREN COMMON 023608102 752,656 -4,755 -0.63 47,582 3.24 0.2536
2018-08-01 2018-06-30 13F AMEREN COMMON 023608102 757,411 -1,870 -0.25 46,088 7.19 0.2657
2018-04-20 2018-03-31 13F AMEREN COMMON 023608102 759,281 -113,231 -12.98 42,998 -16.46 0.2446
2018-01-22 2017-12-31 13F AMEREN COMMON 023608102 872,512 -23,316 -2.60 51,469 -0.67 0.2820
2017-10-25 2017-09-30 13F AMEREN COMMON 023608102 895,828 -11,450 -1.26 51,814 4.46 0.2967
2017-08-10 2017-06-30 13F/A-2 AMEREN COMMON 023608102 907,278 -6,650 -0.73 49,600 -0.58 0.2892
2017-08-01 2017-06-30 13F/A-1 AMEREN COMMON 023608102 907,278 0 49,600 0.2892
2017-04-25 2017-03-31 13F/A-1 AMEREN COMMON 023608102 913,928 -78,670 -7.93 49,891 -4.19 0.2964
2017-04-24 2017-03-31 13F AMEREN COMMON 023608102 1,022,853 50,303
2017-01-25 2016-12-31 13F AMEREN COMMON 023608102 992,598 -30,255 -2.96 52,071 3.51 0.3166
2016-10-20 2016-09-30 13F AMEREN COMMON 023608102 1,022,853 -252,435 -19.79 50,303 -26.38 0.3068
2016-07-14 2016-06-30 13F AMEREN COMMON 023608102 1,275,288 -33,500 -2.56 68,329 4.21 0.4197
2016-04-22 2016-03-31 13F AMEREN COMMON 023608102 1,308,788 -101,116 -7.17 65,570 7.58 0.4034
2016-01-20 2015-12-31 13F AMEREN COMMON 023608102 1,409,904 -159,430 -10.16 60,950 -8.12 0.3740
2015-10-26 2015-09-30 13F AMEREN COMMON 023608102 1,569,334 -379,618 -19.48 66,335 -9.67 0.4264
2015-07-17 2015-06-30 13F AMEREN COMMON 023608102 1,948,952 -1,416,232 -42.08 73,436 -48.29 0.4336
2015-04-30 2015-03-31 13F AMEREN COMMON 023608102 3,365,184 -156,833 -4.45 142,010 -12.59 0.8181
2015-01-20 2014-12-31 13F AMEREN COMMON 023608102 3,522,017 -126,291 -3.46 162,470 16.18 0.9198
2014-10-23 2014-09-30 13F AMEREN COMMON 023608102 3,648,308 -52,600 -1.42 139,839 -7.57 0.8132
2014-08-14 2014-06-30 13F/A-1 AMEREN COMMON 023608102 3,700,908 -25,250 -0.68 151,293 -1.45 0.9588
2014-05-16 2014-03-31 13F AMEREN COMMON 023608102 3,726,158 -1,383,029 -27.07 153,517 -16.90 1.0113
2014-02-04 2013-12-31 13F AMEREN COMMON 023608102 5,109,187 -164,300 -3.12 184,748 0.56 1.2211
2013-10-29 2013-09-30 13F AMEREN COMMON 023608102 5,273,487 -177,407 -3.25 183,728 -6.66 1.2830
2013-08-13 2013-06-30 13F AMEREN COMMON 023608102 5,450,894 5,450,894 196,831 1.3540
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.