American Electric Power Company, Inc.
MX ˙ BMV ˙ US0255371017
SecurityMX:AEP / American Electric Power Company, Inc.
InstitutionMariner, LLC
Latest Disclosed Ownership505,319 shares
Latest Disclosed Value $ 66,237,332
Mariner, LLC reports 4.82% decrease in ownership of AEP / American Electric Power Company, Inc.

On May 13, 2026 - Mariner, LLC filed a 13F-HR form disclosing ownership of 505,319 shares of American Electric Power Company, Inc. (MX:AEP) valued at $66,237,332 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 530,905 shares of American Electric Power Company, Inc.. This represents a change in shares of -4.82% 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)
2026-05-13 2026-03-31 13F AMERICAN ELEC PWR COM 025537101 505,319 -25,586 -4.82 66,237 8.18 0.0773
2026-02-13 2025-12-31 13F AMERICAN ELEC PWR COM 025537101 530,905 22,103 4.34 61,226 7.02 0.0729
2025-11-14 2025-09-30 13F AMERICAN ELEC PWR COM 025537101 508,802 36,699 7.77 57,211 16.83 0.0739
2025-08-14 2025-06-30 13F AMERICAN ELEC PWR COM 025537101 472,103 13,857 3.02 48,968 -2.13 0.0707
2025-05-15 2025-03-31 13F AMERICAN ELEC PWR COM 025537101 458,246 292,343 176.21 50,036 227.03 0.0833
2025-02-13 2024-12-31 13F AMERICAN ELEC PWR COM 025537101 165,903 11,818 7.67 15,301 -3.18 0.0257
2024-11-13 2024-09-30 13F AMERICAN ELEC PWR COM 025537101 154,085 11,039 7.72 15,804 25.91 0.0280
2024-08-13 2024-06-30 13F AMERICAN ELEC PWR COM 025537101 143,046 2,296 1.63 12,551 3.57 0.0243
2024-05-15 2024-03-31 13F AMERICAN ELEC PWR COM 025537101 140,750 4,897 3.60 12,119 9.83 0.0251
2024-02-14 2023-12-31 13F AMERICAN ELEC PWR COM 025537101 135,853 6,528 5.05 11,034 13.43 0.0262
2023-11-13 2023-09-30 13F AMERICAN ELEC PWR COM 025537101 129,325 43,122 50.02 9,728 34.04 0.0261
2023-08-11 2023-06-30 13F AMERICAN ELEC PWR COM 025537101 86,203 1,195 1.41 7,257 103,571.43 0.0194
2023-05-15 2023-03-31 13F AMERICAN ELEC PWR COM 025537101 85,008 4,973 6.21 8 -99.91 0.0225
2023-02-14 2022-12-31 13F AMERICAN ELEC PWR COM 025537101 80,035 17,642 28.28 7,599 40.85 0.0244
2022-11-10 2022-09-30 13F AMERICAN ELEC PWR COM 025537101 62,393 6,490 11.61 5,395 0.58 0.0216
2022-08-15 2022-06-30 13F AMERICAN ELEC PWR COM 025537101 55,903 -694 -1.23 5,364 -5.01 0.0220
2022-05-13 2022-03-31 13F AMERICAN ELEC PWR COM 025537101 56,597 12,775 29.15 5,647 44.83 0.0213
2022-02-14 2021-12-31 13F AMERICAN ELEC PWR COM 025537101 43,822 12,905 41.74 3,899 55.34 0.0165
2021-11-15 2021-09-30 13F AMERICAN ELEC PWR COM 025537101 30,917 4,131 15.42 2,510 10.77 0.0131
2021-08-24 2021-06-30 13F AMERICAN ELEC PWR COM 025537101 26,786 63 0.24 2,266 0.13 0.0141
2021-05-07 2021-03-31 13F AMERICAN ELEC PWR COM 025537101 26,723 6 0.02 2,263 1.71 0.0158
2021-02-16 2020-12-31 13F AMERICAN ELEC PWR COM 025537101 26,717 -1,085 -3.90 2,225 -2.07 0.0171
2020-11-13 2020-09-30 13F AMERICAN ELEC PWR COM 025537101 27,802 -3,187 -10.28 2,272 -7.94 0.0214
2020-08-14 2020-06-30 13F AMERICAN ELEC PWR COM 025537101 30,989 -446 -1.42 2,468 -2.02 0.0247
2020-05-14 2020-03-31 13F AMERICAN ELEC PWR COM 025537101 31,435 6,049 23.83 2,519 5.00 0.0315
2020-02-13 2019-12-31 13F AMERICAN ELEC PWR COM 025537101 25,386 -1,308 -4.90 2,399 -4.08 0.0249
2019-11-13 2019-09-30 13F AMERICAN ELEC PWR COM 025537101 26,694 2,505 10.36 2,501 17.47 0.0299
2019-08-14 2019-06-30 13F AMERICAN ELEC PWR COM 025537101 24,189 2,387 10.95 2,129 16.59 0.0254
2019-05-15 2019-03-31 13F AMERICAN ELEC PWR COM 025537101 21,802 182 0.84 1,826 14.13 0.0260
2019-02-13 2018-12-31 13F AMERICAN ELEC PWR COM 025537101 21,620 8,529 65.15 1,600 72.41 0.0285
2018-11-14 2018-09-30 13F AMERICAN ELEC PWR COM 025537101 13,091 4,040 44.64 928 48.01 0.0239
2018-08-14 2018-06-30 13F AMERICAN ELEC PWR COM 025537101 9,051 2,589 40.06 627 41.53 0.0178
2018-05-15 2018-03-31 13F AMERICAN ELEC PWR COM 025537101 6,462 -1,271 -16.44 443 -22.14 0.0159
2018-02-09 2017-12-31 13F AMERICAN ELEC PWR COM 025537101 7,733 -17 -0.22 569 4.60 0.0220
2017-11-14 2017-09-30 13F AMERICAN ELEC PWR COM 025537101 7,750 97 1.27 544 2.26 0.0246
2017-08-11 2017-06-30 13F AMERICAN ELEC PWR COM 025537101 7,653 -432 -5.34 532 -2.03 0.0250
2017-05-15 2017-03-31 13F AMERICAN ELEC PWR COM 025537101 8,085 -120 -1.46 543 5.03 0.0236
2017-02-14 2016-12-31 13F AMERICAN ELEC PWR COM 025537101 8,205 -1,942 -19.14 517 -20.71 0.0238
2016-11-14 2016-09-30 13F AMERICAN ELEC PWR COM 025537101 10,147 1,075 11.85 652 2.52 0.0315
2016-08-12 2016-06-30 13F AMERICAN ELEC PWR COM 025537101 9,072 -357 -3.79 636 1.60 0.0344
2016-05-13 2016-03-31 13F AMERICAN ELEC PWR COM 025537101 9,429 454 5.06 626 19.69 0.0372
2016-02-16 2015-12-31 13F AMERICAN ELEC PWR COM 025537101 8,975 -10,094 -52.93 523 -51.75 0.0336
2015-11-16 2015-09-30 13F AMERICAN ELEC PWR COM 025537101 19,069 2,089 12.30 1,084 20.58 0.0482
2015-08-17 2015-06-30 13F American Electric Power COS 025537101 16,980 8,310 95.85 899 84.22 0.0417
2015-05-15 2015-03-31 13F AMERICAN ELEC PWR COM 025537101 8,670 23 0.27 488 -7.05 0.0415
2015-02-13 2014-12-31 13F AMERICAN ELEC PWR COM 025537101 8,647 507 6.23 525 23.53 0.0473
2014-11-13 2014-09-30 13F AMERICAN ELEC PWR COM 025537101 8,140 282 3.59 425 -2.97 0.0479
2014-08-21 2014-06-30 13F AMERICAN ELEC PWR COM 025537101 7,858 118 1.52 438 11.73 0.0486
2014-05-08 2014-03-31 13F AMERICAN ELEC PWR COM 025537101 7,740 -399 -4.90 392 3.16 0.0505
2014-02-14 2013-12-31 13F AMERICAN ELEC PWR COM 025537101 8,139 8,139 380 0.0476
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.