Ameren Corporation
US ˙ NYSE ˙ US0236081024

SecurityAEE / Ameren Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership373,127 shares
Latest Disclosed Value $ 37,260,928
Sei Investments Co reports 26.36% increase in ownership of AEE / Ameren Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 373,127 shares of Ameren Corporation (US:AEE) valued at $37,260,462 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 295,281 shares of Ameren Corporation. This represents a change in shares of 26.36% during the quarter. The current value of the position is $39,920,858 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)
2026-02-13 2025-12-31 13F AMEREN COM 023608102 373,127 77,846 26.36 37,261 20.89 0.0368
2025-11-13 2025-09-30 13F AMEREN COM 023608102 295,281 -74,511 -20.15 30,822 -13.21 0.0331
2025-08-14 2025-06-30 13F AMEREN COM 023608102 369,792 73,425 24.78 35,514 19.36 0.0412
2025-05-14 2025-03-31 13F/A-1 AMEREN COM 023608102 296,367 24,539 9.03 29,754 22.79 0.0383
2025-05-13 2025-03-31 13F AMEREN COM 023608102 272,551 723 24,376 0.0265
2025-02-11 2024-12-31 13F AMEREN COM 023608102 271,828 -6,429 -2.31 24,232 -0.43 0.0311
2024-11-12 2024-09-30 13F AMEREN COM 023608102 278,257 32,227 13.10 24,336 39.09 0.0316
2024-08-13 2024-06-30 13F AMEREN COM 023608102 246,030 108,664 79.11 17,496 72.20 0.0248
2024-05-07 2024-03-31 13F AMEREN COM 023608102 137,366 -24,744 -15.26 10,160 -13.35 0.0149
2024-02-14 2023-12-31 13F AMEREN COM 023608102 162,110 45,328 38.81 11,727 34.20 0.0188
2023-11-14 2023-09-30 13F AMEREN COM 023608102 116,782 6,964 6.34 8,739 -2.56 0.0157
2023-08-11 2023-06-30 13F AMEREN COM 023608102 109,818 3,359 3.16 8,969 -2.48 0.0156
2023-05-12 2023-03-31 13F AMEREN COM 023608102 106,459 6,149 6.13 9,197 3.11 0.0171
2023-02-10 2022-12-31 13F AMEREN COM 023608102 100,310 -26,433 -20.86 8,920 -12.64 0.0198
2022-11-14 2022-09-30 13F AMEREN COM 023608102 126,743 -22,741 -15.21 10,209 -24.43 0.0228
2022-08-15 2022-06-30 13F AMEREN COM 023608102 149,484 35,124 30.71 13,509 25.97 0.0292
2022-05-13 2022-03-31 13F AMEREN COM 023608102 114,360 4,148 3.76 10,724 9.32 0.0216
2022-02-14 2021-12-31 13F AMEREN COM 023608102 110,212 23,713 27.41 9,810 40.02 0.0184
2021-11-12 2021-09-30 13F AMEREN COM 023608102 86,499 9,781 12.75 7,006 14.09 0.0147
2021-08-06 2021-06-30 13F AMEREN COM 023608102 76,718 -18,724 -19.62 6,141 -20.91 0.0136
2021-05-12 2021-03-31 13F AMEREN COM 023608102 95,442 126 0.13 7,765 4.34 0.0196
2021-02-08 2020-12-31 13F AMEREN COM 023608102 95,316 -112,592 -54.15 7,442 -54.74 0.0192
2020-12-04 2020-09-30 13F/A-1 AMEREN COM 023608102 207,908 37,113 21.73 16,442 36.83 0.0476
2020-11-06 2020-09-30 13F AMEREN COM 023608102 207,985 37,190 16,448 39,603.1270
2020-08-17 2020-06-30 13F/A-1 AMEREN COM 023608102 170,795 68,638 67.19 12,016 61.57 0.0373
2020-08-11 2020-06-30 13F AMEREN COM 023608102 73,713 -28,444 5,646 15,315.0755
2020-05-14 2020-03-31 13F AMEREN COM 023608102 102,157 28,914 39.48 7,437 32.19 0.0273
2020-02-06 2019-12-31 13F AMEREN COM 023608102 73,243 -23,310 -24.14 5,626 -27.24 0.0168
2019-11-12 2019-09-30 13F AMEREN COM 023608102 96,553 -8,198 -7.83 7,732 -1.54 0.0198
2019-08-14 2019-06-30 13F AMEREN COM 023608102 104,751 -7,595 -6.76 7,853 -4.94 0.0257
2019-05-15 2019-03-31 13F AMEREN COM 023608102 112,346 5,783 5.43 8,261 22.68 0.0277
2019-02-13 2018-12-31 13F AMEREN COM 023608102 106,563 -336 -0.31 6,734 -0.37 0.0240
2018-11-08 2018-09-30 13F AMEREN COM 023608102 106,899 8,549 8.69 6,759 12.93 0.0245
2018-08-03 2018-06-30 13F AMEREN COM 023608102 98,350 90,609 1,170.51 5,985 1,266.44 0.0203
2018-05-11 2018-03-31 13F AMEREN COM 023608102 7,741 -100,924 -92.88 438 -93.12 0.0017
2018-02-08 2017-12-31 13F AMEREN COM 023608102 108,665 -59,107 -35.23 6,369 -43.60 0.0221
2017-11-06 2017-09-30 13F AMEREN COM 023608102 167,772 81,569 94.62 11,293 139.66 0.0401
2017-07-31 2017-06-30 13F AMEREN COM 023608102 86,203 37,386 76.58 4,712 76.81 0.0188
2017-05-05 2017-03-31 13F AMEREN COM 023608102 48,817 -35,817 -42.32 2,665 -15.77 0.0117
2017-02-02 2016-12-31 13F AMEREN COM 023608102 84,634 42,996 103.26 3,164 54.49 0.0153
2016-11-04 2016-09-30 13F AMEREN COM 023608102 41,638 8,258 24.74 2,048 14.54 0.0104
2016-08-11 2016-06-30 13F AMEREN COM 023608102 33,380 -6,110 -15.47 1,788 -9.65 0.0107
2016-05-10 2016-03-31 13F/A-1 AMEREN COM 023608102 39,490 6,897 21.16 1,979 40.45 0.0123
2016-02-03 2015-12-31 13F AMEREN COM 023608102 32,593 23,711 266.96 1,409 274.73 0.0086
2015-11-02 2015-09-30 13F/A-1 AMEREN COM 023608102 8,882 -5,551 -38.46 376 -30.76 0.0035
2015-10-30 2015-09-30 13F AMEREN COM 023608102 8,882 377
2015-08-07 2015-06-30 13F/A-1 AMEREN COM 023608102 14,433 35 0.24 543 -10.40 0.0049
2015-08-04 2015-06-30 13F AMEREN COM 023608102 14,433 35 543 0.0049
2015-05-14 2015-03-31 13F/A-1 AMEREN COM 023608102 14,398 -9,005 -38.48 606 -43.78 0.0053
2015-05-01 2015-03-31 13F AMEREN COM 023608102 14,398 606
2015-02-10 2014-12-31 13F AMEREN COM 023608102 23,403 23,403 1,078 0.0095
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.