Ameren Corporation
US ˙ NYSE ˙ US0236081024

SecurityAEE / Ameren Corporation
InstitutionBrown Advisory Inc
Latest Disclosed Ownership9,295 shares
Latest Disclosed Value $ 1,021,752
Brown Advisory Inc reports 84.94% increase in ownership of AEE / Ameren Corporation

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 9,295 shares of Ameren Corporation (US:AEE) valued at $1,021,706 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 5,026 shares of Ameren Corporation. This represents a change in shares of 84.94% during the quarter. The current value of the position is $987,408 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 9,295 4,269 84.94 1,022 103.79 0.0007
2026-02-13 2025-12-31 13F AMEREN COM 023608102 5,026 185 3.82 502 -0.79 0.0007
2025-11-14 2025-09-30 13F AMEREN COM 023608102 4,841 153 3.26 505 12.22 0.0007
2025-08-13 2025-06-30 13F AMEREN COM 023608102 4,688 277 6.28 450 1.81 0.0006
2025-04-30 2025-03-31 13F AMEREN COM 023608102 4,411 -89 -1.98 443 10.22 0.0006
2025-02-14 2024-12-31 13F AMEREN COM 023608102 4,500 2,017 81.23 401 84.79 0.0005
2024-11-13 2024-09-30 13F AMEREN COM 023608102 2,483 2,483 217 0.0003
2024-08-14 2024-06-30 13F AMEREN COM 023608102 0 -2,721 -100.00 0 -100.00
2024-04-24 2024-03-31 13F AMEREN COM 023608102 2,721 2,721 201 0.0003
2023-10-25 2023-09-30 13F AMEREN COM 023608102 0 -2,485 -100.00 0 -100.00
2023-07-31 2023-06-30 13F AMEREN COM 023608102 2,485 0 0.00 203 -5.61 0.0003
2023-05-08 2023-03-31 13F AMEREN COM 023608102 2,485 74 3.07 215 0.00 0.0004
2023-02-13 2022-12-31 13F AMEREN COM 023608102 2,411 -728 -23.19 214 -15.42 0.0004
2022-11-14 2022-09-30 13F AMEREN COM 023608102 3,139 321 11.39 253 -0.78 0.0005
2022-11-14 2022-06-30 13F/A-2 AMEREN COM 023608102 2,818 -103 -3.53 255 -6.93 0.0005
2022-09-13 2022-06-30 13F/A-1 AMEREN COM 023608102 2,413 -103 218 0.0004
2022-08-02 2022-06-30 13F AMEREN COM 023608102 2,413 -103 218 0.0001
2022-11-14 2022-03-31 13F/A-2 AMEREN COM 023608102 2,921 -554 -15.94 274 -11.33 0.0004
2022-09-13 2022-03-31 13F/A-1 AMEREN COM 023608102 2,516 -959 236 0.0003
2022-05-09 2022-03-31 13F AMEREN COM 023608102 2,516 -959 236 0.0003
2022-01-27 2021-12-31 13F AMEREN COM 023608102 3,475 73 2.15 309 11.96 0.0004
2021-11-12 2021-09-30 13F AMEREN COM 023608102 3,402 -402 -10.57 276 -9.21 0.0004
2021-07-29 2021-06-30 13F AMEREN COM 023608102 3,804 -9 -0.24 304 -1.94 0.0005
2021-05-14 2021-03-31 13F AMEREN COM 023608102 3,813 -5 -0.13 310 4.03 0.0005
2021-02-12 2020-12-31 13F AMEREN COM 023608102 3,818 -931 -19.60 298 -20.74 0.0005
2020-11-16 2020-09-30 13F AMEREN COM 023608102 4,749 1,380 40.96 376 58.65 0.0008
2020-08-14 2020-06-30 13F AMEREN COM 023608102 3,369 -11 -0.33 237 -3.66 0.0006
2020-05-15 2020-03-31 13F AMEREN COM 023608102 3,380 11 0.33 246 -5.02 0.0008
2020-02-14 2019-12-31 13F AMEREN COM 023608102 3,369 19 0.57 259 -3.36 0.0007
2019-11-14 2019-09-30 13F AMEREN COM 023608102 3,350 88 2.70 268 9.39 0.0008
2019-08-12 2019-06-30 13F AMEREN COM 023608102 3,262 -1,456 -30.86 245 -29.39 0.0007
2019-05-15 2019-03-31 13F AMEREN COM 023608102 4,718 -246 -4.96 347 7.43 0.0010
2019-02-13 2018-12-31 13F AMEREN COM 023608102 4,964 -461 -8.50 323 -5.83 0.0011
2018-11-13 2018-09-30 13F AMEREN COM 023608102 5,425 317 6.21 343 10.29 0.0010
2018-08-10 2018-06-30 13F AMEREN COM 023608102 5,108 839 19.65 311 29.05 0.0010
2018-06-28 2018-03-31 13F/A-1 AMEREN COM 023608102 4,269 -348 -7.54 241 -11.72 0.0008
2018-05-14 2018-03-31 13F AMEREN COM 023608102 4,269 -348 241
2018-02-12 2017-12-31 13F AMEREN COM 023608102 4,617 200 4.53 273 7.06 0.0009
2017-11-13 2017-09-30 13F AMEREN COM 023608102 4,417 0 0.00 255 5.81 0.0008
2017-08-14 2017-06-30 13F AMEREN COM 023608102 4,417 16 0.36 241 0.42 0.0007
2017-05-15 2017-03-31 13F AMEREN COM 023608102 4,401 -145 -3.19 240 0.84 0.0008
2017-02-13 2016-12-31 13F AMEREN COM 023608102 4,546 4,546 238 0.0008
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.