Ameren Corporation
MX ˙ BMV ˙ US0236081024
SecurityMX:AEE / Ameren Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,151,324 shares
Latest Disclosed Value $ 126,551,848
Dimensional Fund Advisors Lp reports 2.95% increase in ownership of AEE / Ameren Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 1,151,324 shares of Ameren Corporation (MX:AEE) valued at $126,551,848 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,118,342 shares of Ameren Corporation. This represents a change in shares of 2.95% during the quarter.

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)
2026-05-07 2026-03-31 13F AMEREN COM 023608102 1,151,324 32,982 2.95 126,552 13.31 0.0263
2026-02-12 2025-12-31 13F AMEREN COM 023608102 1,118,342 25,889 2.37 111,688 -2.05 0.0234
2025-11-12 2025-09-30 13F AMEREN COM 023608102 1,092,453 22,274 2.08 114,021 10.95 0.0245
2025-08-12 2025-06-30 13F AMEREN COM 023608102 1,070,179 15,449 1.46 102,772 -2.94 0.0238
2025-05-13 2025-03-31 13F AMEREN COM 023608102 1,054,730 18,506 1.79 105,890 14.63 0.0263
2025-02-13 2024-12-31 13F AMEREN COM 023608102 1,036,224 31,288 3.11 92,373 5.11 0.0222
2024-11-07 2024-09-30 13F AMEREN COM 023608102 1,004,936 25,842 2.64 87,883 26.23 0.0213
2024-08-09 2024-06-30 13F AMEREN COM 023608102 979,094 91,182 10.27 69,622 6.02 0.0182
2024-05-10 2024-03-31 13F AMEREN COM 023608102 887,912 -10,726 -1.19 65,670 1.02 0.0178
2024-02-07 2023-12-31 13F AMEREN COM 023608102 898,638 12,431 1.40 65,007 -1.97 0.0190
2023-11-09 2023-09-30 13F AMEREN COM 023608102 886,207 7,321 0.83 66,313 -7.61 0.0217
2023-08-09 2023-06-30 13F AMEREN COM 023608102 878,886 38,883 4.63 71,776 -1.09 0.0229
2023-05-12 2023-03-31 13F AMEREN COM 023608102 840,003 6,473 0.78 72,568 97,964.86 0.0244
2023-02-09 2022-12-31 13F AMEREN COM 023608102 833,530 -215 -0.03 74 -99.89 0.0219
2022-11-10 2022-09-30 13F AMEREN COM 023608102 833,745 12,810 1.56 67,169 -9.45 0.0258
2022-08-12 2022-06-30 13F AMEREN COM 023608102 820,935 18,426 2.30 74,175 -1.42 0.0266
2022-05-13 2022-03-31 13F AMEREN COM 023608102 802,509 1,679 0.21 75,244 5.56 0.0232
2022-02-09 2021-12-31 13F AMEREN COM 023608102 800,830 98 0.01 71,282 9.89 0.0216
2021-11-12 2021-09-30 13F AMEREN COM 023608102 800,732 -755 -0.09 64,868 1.12 0.0209
2021-08-12 2021-06-30 13F AMEREN COM 023608102 801,487 1,719 0.21 64,150 -1.41 0.0203
2021-05-14 2021-03-31 13F AMEREN COM 023608102 799,768 -19,484 -2.38 65,069 1.76 0.0215
2021-03-08 2020-12-31 13F/A-2 AMEREN COM 023608102 819,252 13,738 1.71 63,945 0.39 0.0231
2021-02-11 2020-12-31 13F AMEREN COM 023608102 819,252 13,738 63,945 23,093.5351
2020-11-12 2020-09-30 13F AMEREN COM 023608102 805,514 14,677 1.86 63,698 14.48 0.0270
2020-08-13 2020-06-30 13F AMEREN COM 023608102 790,837 6,944 0.89 55,639 -2.60 0.0245
2020-05-14 2020-03-31 13F AMEREN COM 023608102 783,893 2,669 0.34 57,125 -4.79 0.0298
2020-02-14 2019-12-31 13F AMEREN COM 023608102 781,224 2,895 0.37 59,997 -3.70 0.0219
2019-11-12 2019-09-30 13F AMEREN COM 023608102 778,329 56,485 7.83 62,305 14.92 0.0242
2019-08-13 2019-06-30 13F AMEREN COM 023608102 721,844 20,770 2.96 54,214 5.14 0.0211
2019-08-12 2019-03-31 13F/A-2 AMEREN COM 023608102 701,074 33,040 4.95 51,563 18.33 0.0205
2019-05-10 2019-03-31 13F AMEREN COM 023608102 701,074 33,040 51,563
2019-02-26 2018-12-31 13F/A-1 AMEREN COM 023608102 668,034 70,480 11.79 43,574 15.36 0.0197
2019-02-13 2018-12-31 13F AMEREN COM 023608102 668,034 70,480 43,574
2018-11-13 2018-09-30 13F AMEREN COM 023608102 597,554 12,620 2.16 37,773 6.12 0.0144
2018-08-10 2018-06-30 13F AMEREN COM 023608102 584,934 7,918 1.37 35,593 8.93 0.0142
2018-05-11 2018-03-31 13F AMEREN COM 023608102 577,016 2,100 0.37 32,676 -3.65 0.0136
2018-02-12 2017-12-31 13F AMEREN COM 023608102 574,916 8,898 1.57 33,915 3.59 0.0141
2017-11-13 2017-09-30 13F AMEREN COM 023608102 566,018 1,645 0.29 32,741 6.11 0.0143
2017-08-11 2017-06-30 13F AMEREN COM 023608102 564,373 7,577 1.36 30,855 1.51 0.0142
2017-05-12 2017-03-31 13F AMEREN COM 023608102 556,796 34,231 6.55 30,396 10.88 0.0145
2017-02-09 2016-12-31 13F AMEREN COM 023608102 522,565 12,576 2.47 27,414 9.29 0.0137
2016-11-10 2016-09-30 13F AMEREN COM 023608102 509,989 27,410 5.68 25,084 -2.97 0.0136
2016-08-09 2016-06-30 13F AMEREN COM 023608102 482,579 3,915 0.82 25,851 7.81 0.0149
2016-05-13 2016-03-31 13F AMEREN COM 023608102 478,664 16,976 3.68 23,979 20.12 0.0144
2016-02-10 2015-12-31 13F AMEREN COM 023608102 461,688 23,650 5.40 19,963 7.83 0.0124
2015-11-13 2015-09-30 13F AMEREN COM 023608102 438,038 6,033 1.40 18,514 13.74 0.0122
2015-08-14 2015-06-30 13F AMEREN COM 023608102 432,005 63,840 17.34 16,278 4.78 0.0100
2015-05-14 2015-03-31 13F AMEREN COM 023608102 368,165 34,352 10.29 15,535 0.84 0.0098
2015-02-06 2014-12-31 13F AMEREN COM 023608102 333,813 6,062 1.85 15,405 22.63 0.0101
2014-11-13 2014-09-30 13F AMEREN COM 023608102 327,751 -12,361 -3.63 12,562 -9.64 0.0089
2014-08-08 2014-06-30 13F AMEREN COM 023608102 340,112 1,360 0.40 13,902 -0.37 0.0097
2014-05-14 2014-03-31 13F AMEREN COM 023608102 338,752 15,835 4.90 13,953 19.49 0.0104
2014-02-12 2013-12-31 13F AMEREN COM 023608102 322,917 19,220 6.33 11,677 10.36 0.0091
2013-11-13 2013-09-30 13F AMEREN COM 023608102 303,697 14,110 4.87 10,581 6.10 0.0092
2013-08-15 2013-06-30 13F AMEREN COM 023608102 289,587 289,587 9,973 0.0094
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.