Ameren Corporation
US ˙ NYSE ˙ US0236081024

SecurityAEE / Ameren Corporation
InstitutionOMERS ADMINISTRATION Corp
Latest Disclosed Ownership12,135 shares
Latest Disclosed Value $ 1,333,879
OMERS ADMINISTRATION Corp reports 28.26% increase in ownership of AEE / Ameren Corporation

On May 15, 2026 - OMERS ADMINISTRATION Corp filed a 13F-HR form disclosing ownership of 12,135 shares of Ameren Corporation (US:AEE) valued at $1,333,879 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 9,461 shares of Ameren Corporation. This represents a change in shares of 28.26% during the quarter. The current value of the position is $1,289,101 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 12,135 2,674 28.26 1,334 41.21 0.0086
2026-02-13 2025-12-31 13F AMEREN COM 023608102 9,461 0 0.00 945 -4.36 0.0067
2025-11-14 2025-09-30 13F AMEREN COM 023608102 9,461 0 0.00 988 8.70 0.0071
2025-08-13 2025-06-30 13F AMEREN COM 023608102 9,461 0 0.00 909 -4.32 0.0071
2025-05-14 2025-03-31 13F AMEREN COM 023608102 9,461 -1,550 -14.08 950 -3.26 0.0083
2025-02-14 2024-12-31 13F AMEREN COM 023608102 11,011 -4,314 -28.15 982 -26.79 0.0086
2024-11-13 2024-09-30 13F AMEREN COM 023608102 15,325 6,200 67.95 1,340 106.79 0.0123
2024-08-13 2024-06-30 13F AMEREN COM 023608102 9,125 9,125 649 0.0062
2020-05-15 2020-03-31 13F AMEREN COM 023608102 0 -100,653 -100.00 0 -100.00
2020-02-14 2019-12-31 13F AMEREN COM 023608102 100,653 1,300 1.31 7,730 -2.80 0.0892
2019-11-12 2019-09-30 13F AMEREN COM 023608102 99,353 -59,600 -37.50 7,953 -34.28 0.0792
2019-08-08 2019-06-30 13F AMEREN COM 023608102 158,953 146,653 1,192.30 12,101 1,191.46 0.1259
2019-05-15 2019-03-31 13F AMEREN COM 023608102 12,300 12,300 937 0.0108
2019-02-14 2018-12-31 13F AMEREN COM 023608102 0 -158,453 -100.00 0 -100.00
2018-11-14 2018-09-30 13F AMEREN COM 023608102 158,453 -38,600 -19.59 10,017 -16.46 0.0959
2018-08-09 2018-06-30 13F AMEREN COM 023608102 197,053 29,900 17.89 11,991 26.67 0.1108
2018-05-11 2018-03-31 13F AMEREN COM 023608102 167,153 29,100 21.08 9,466 16.23 0.0921
2018-05-14 2017-12-31 13F/A-1 AMEREN COM 023608102 138,053 84,600 158.27 8,144 163.39 0.0813
2018-02-13 2017-12-31 13F AMEREN COM 023608102 138,053 84,600 8,144
2018-05-14 2017-09-30 13F/A-1 AMEREN COM 023608102 53,453 24,200 82.73 3,092 93.37 0.0342
2017-11-13 2017-09-30 13F AMEREN COM 023608102 53,453 24,200 3,092
2017-08-08 2017-06-30 13F AMEREN COM 023608102 29,253 -6,747 -18.74 1,599 7.82 0.0202
2014-05-08 2014-03-31 13F AMEREN COM 023608102 36,000 36,000 1,483 0.0479
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.