Ameren Corporation
US ˙ NYSE ˙ US0236081024

SecurityAEE / Ameren Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership2,927,546 shares
Latest Disclosed Value $ 321,796,062
Morgan Stanley reports 3.19% decrease in ownership of AEE / Ameren Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 2,927,546 shares of Ameren Corporation (US:AEE) valued at $321,795,856 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 3,023,867 shares of Ameren Corporation. This represents a change in shares of -3.19% during the quarter. The current value of the position is $310,993,212 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 2,927,546 -96,321 -3.19 321,796 6.57 0.0194
2026-05-27 2025-12-31 13F/A-1 AMEREN COM 023608102 3,023,867 129,338 4.47 301,964 -0.06 0.0180
2026-02-13 2025-12-31 13F AMEREN COM 023608102 3,023,867 129,338 301,964 0.0180
2026-05-27 2025-09-30 13F/A-1 AMEREN COM 023608102 2,894,529 -42,975 -1.46 302,131 7.09 0.0183
2025-11-14 2025-09-30 13F AMEREN COM 023608102 2,894,529 -42,975 302,131 0.0183
2025-08-15 2025-06-30 13F AMEREN COM 023608102 2,937,504 559,298 23.52 282,118 18.15 0.0184
2025-05-15 2025-03-31 13F AMEREN COM 023608102 2,378,206 246,054 11.54 238,772 25.63 0.0171
2025-05-15 2024-12-31 13F/A-1 AMEREN COM 023608102 2,132,152 -88,580 -3.99 190,060 -2.14 0.0133
2025-02-14 2024-12-31 13F AMEREN COM 023608102 2,132,152 -88,580 190,060 0.0133
2025-05-14 2024-09-30 13F/A-2 AMEREN COM 023608102 2,220,732 -47,154 -2.08 194,225 20.44 0.0141
2025-02-14 2024-09-30 13F/A-1 AMEREN COM 023608102 2,220,732 -47,154 194,225 0.0141
2024-11-14 2024-09-30 13F AMEREN COM 023608102 2,220,732 -47,154 194,225 0.0017
2025-05-14 2024-06-30 13F/A-2 AMEREN COM 023608102 2,267,886 -99,422 -4.20 161,269 -7.89 0.0125
2024-10-17 2024-06-30 13F/A-1 AMEREN COM 023608102 2,267,886 -99,422 161,269 0.0125
2024-08-14 2024-06-30 13F AMEREN COM 023608102 2,267,886 -99,422 161,269 0.0125
2024-10-17 2024-03-31 13F/A-2 AMEREN COM 023608102 2,367,308 -312,714 -11.67 175,086 -9.69 0.0140
2024-08-16 2024-03-31 13F/A-1 AMEREN COM 023608102 2,367,308 -312,714 175,086 0.0016
2024-05-15 2024-03-31 13F AMEREN COM 023608102 2,367,308 -312,714 175,086 0.0140
2024-08-16 2023-12-31 13F/A-1 AMEREN COM 023608102 2,680,022 -166,488 -5.85 193,873 -8.98 0.0171
2024-02-13 2023-12-31 13F AMEREN COM 023608102 2,680,022 -166,488 193,873 0.0171
2023-11-15 2023-09-30 13F AMEREN COM 023608102 2,846,510 312,509 12.33 213,004 2.92 0.0217
2023-08-14 2023-06-30 13F AMEREN COM 023608102 2,534,001 442,159 21.14 206,952 14.52 0.0204
2023-05-15 2023-03-31 13F AMEREN COM 023608102 2,091,842 -575,023 -21.56 180,714 -23.79 0.0194
2023-02-14 2022-12-31 13F AMEREN COM 023608102 2,666,865 4,943 0.19 237,138 10.60 0.0269
2022-11-14 2022-09-30 13F AMEREN COM 023608102 2,661,922 -131,949 -4.72 214,418 -15.07 0.0292
2022-10-27 2022-06-30 13F/A-1 AMEREN COM 023608102 2,793,871 1,536,077 122.12 252,455 114.07 0.0328
2022-08-15 2022-06-30 13F AMEREN COM 023608102 2,793,871 1,536,077 252,455 0.0066
2022-10-27 2022-03-31 13F/A-1 AMEREN COM 023608102 1,257,794 -179,544 -12.49 117,929 -7.82 0.0159
2022-05-13 2022-03-31 13F AMEREN COM 023608102 1,257,794 -179,544 117,929 0.0159
2022-02-14 2021-12-31 13F AMEREN COM 023608102 1,437,338 -59,153 -3.95 127,938 5.55 0.0158
2021-11-15 2021-09-30 13F AMEREN COM 023608102 1,496,491 -102,632 -6.42 121,216 -5.29 0.0163
2021-08-23 2021-06-30 13F/A-1 AMEREN COM 023608102 1,599,123 458,665 40.22 127,993 37.94 0.0169
2021-08-16 2021-06-30 13F AMEREN COM 023608102 1,599,123 458,665 127,993 0.0035
2021-05-17 2021-03-31 13F AMEREN COM 023608102 1,140,458 -249,194 -17.93 92,787 -14.46 0.0136
2021-02-16 2020-12-31 13F AMEREN COM 023608102 1,389,652 237,991 20.67 108,477 19.11 0.0168
2020-11-13 2020-09-30 13F AMEREN COM 023608102 1,151,661 277,654 31.77 91,073 48.10 0.0176
2020-08-14 2020-06-30 13F AMEREN COM 023608102 874,007 -6,493 -0.74 61,494 -4.11 0.0136
2020-05-26 2020-03-31 13F/A-1 AMEREN COM 023608102 880,500 76,719 9.54 64,128 3.88 0.0174
2020-05-15 2020-03-31 13F AMEREN COM 023608102 880,500 76,719 64,128 4,926.3672
2020-02-14 2019-12-31 13F AMEREN COM 023608102 803,781 52,548 6.99 61,731 2.65 0.0144
2019-11-14 2019-09-30 13F AMEREN COM 023608102 751,233 -96,063 -11.34 60,137 -5.51 0.0159
2019-08-14 2019-06-30 13F AMEREN COM 023608102 847,296 -9,666 -1.13 63,641 0.97 0.0169
2019-05-15 2019-03-31 13F AMEREN COM 023608102 856,962 -251,812 -22.71 63,029 -12.85 0.0178
2019-02-14 2018-12-31 13F AMEREN COM 023608102 1,108,774 54,283 5.15 72,326 8.49 0.0216
2019-04-23 2018-09-30 13F/A-2 AMEREN COM 023608102 1,054,491 235,626 28.77 66,665 33.79 0.0167
2018-11-20 2018-09-30 13F/A-1 AMEREN COM 023608102 1,054,491 0 66,665 0.0167
2018-11-14 2018-09-30 13F AMEREN COM 023608102 1,054,491 235,626 66,665
2019-04-23 2018-06-30 13F/A-1 AMEREN COM 023608102 818,865 -70,277 -7.90 49,827 -1.04 0.0135
2018-08-14 2018-06-30 13F AMEREN COM 023608102 818,865 -70,277 49,827
2019-04-23 2018-03-31 13F/A-1 AMEREN COM 023608102 889,142 -268,473 -23.19 50,352 -26.27 0.0140
2018-05-14 2018-03-31 13F AMEREN COM 023608102 889,142 -268,473 50,352
2019-04-23 2017-12-31 13F/A-1 AMEREN COM 023608102 1,157,615 79,434 7.37 68,288 9.50 0.0187
2018-02-14 2017-12-31 13F AMEREN COM 023608102 1,157,615 79,434 68,288
2017-11-14 2017-09-30 13F AMEREN COM 023608102 1,078,181 -731,610 -40.43 62,361 -36.97 0.0187
2017-08-11 2017-06-30 13F AMEREN COM 023608102 1,809,791 319,331 21.42 98,941 21.60 0.0299
2017-05-22 2017-03-31 13F/A-1 AMEREN COM 023608102 1,490,460 485,387 48.29 81,363 54.32 0.0250
2017-05-12 2017-03-31 13F AMEREN COM 023608102 1,490,460 81,363
2017-02-22 2016-12-31 13F/A-1 AMEREN COM 023608102 1,005,073 -119,061 -10.59 52,725 -4.63 0.0173
2017-02-13 2016-12-31 13F AMEREN COM 023608102 1,005,073 52,725
2016-11-10 2016-09-30 13F AMEREN COM 023608102 1,124,134 161,621 16.79 55,285 7.20 0.0189
2016-08-12 2016-06-30 13F AMEREN COM 023608102 962,513 205,243 27.10 51,571 35.93 0.0186
2016-05-12 2016-03-31 13F AMEREN COM 023608102 757,270 -722,020 -48.81 37,940 -40.67 0.0146
2016-02-09 2015-12-31 13F AMEREN COM 023608102 1,479,290 55,021 3.86 63,949 6.22 0.0231
2016-02-08 2015-09-30 13F/A-1 AMEREN COM 023608102 1,424,269 -275,831 -16.22 60,204 -6.02 0.0222
2015-11-09 2015-09-30 13F AMEREN COM 023608102 1,424,269 60,204
2015-08-12 2015-06-30 13F AMEREN COM 023608102 1,700,100 202,639 13.53 64,060 1.38 0.0222
2015-05-14 2015-03-31 13F AMEREN COM 023608102 1,497,461 218,001 17.04 63,190 7.06 0.0233
2015-02-13 2014-12-31 13F AMEREN COM 023608102 1,279,460 -277,032 -17.80 59,022 -1.07 0.0216
2014-12-16 2014-09-30 13F/A-1 AMEREN COM 023608102 1,556,492 134,412 9.45 59,660 2.62 0.0229
2014-11-14 2014-09-30 13F AMEREN COM 023608102 1,556,492 59,660
2014-08-12 2014-06-30 13F AMEREN COM 023608102 1,422,080 -532,318 -27.24 58,135 -27.80 0.0994
2014-05-13 2014-03-31 13F AMEREN COM 023608102 1,954,398 423,377 27.65 80,520 45.45 0.0337
2014-02-13 2013-12-31 13F AMEREN COM 023608102 1,531,021 -75,058 -4.67 55,361 -1.06 0.0235
2013-11-13 2013-09-30 13F AMEREN CORP COM ST COM 023608102 1,606,079 -51,359 -3.10 55,955 -1.97 0.0264
2013-08-08 2013-06-30 13F AMEREN CORP COM ST COM 023608102 1,657,438 1,657,438 57,081 0.0288
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.