FirstEnergy Corp.
MX ˙ BMV ˙ US3379321074
SecurityMX:FE / FirstEnergy Corp.
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership46,809 shares
Latest Disclosed Value $ 2,371,344
Marshall Wace, Llp reports 96.40% decrease in ownership of FE / FirstEnergy Corp.

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 46,809 shares of FirstEnergy Corp. (MX:FE) valued at $2,371,344 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,301,980 shares of FirstEnergy Corp.. This represents a change in shares of -96.40% 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)
2026-05-14 2026-03-31 13F FIRSTENERGY COMMON STOCK 337932107 46,809 -1,255,171 -96.40 2,371 -95.93 0.0011
2026-02-13 2025-12-31 13F FIRSTENERGY COMMON STOCK 337932107 1,301,980 -1,973,429 -60.25 58,290 -61.16 0.0531
2025-11-13 2025-09-30 13F FIRSTENERGY COMMON STOCK 337932107 3,275,409 1,841,946 128.50 150,079 160.05 0.1522
2025-08-13 2025-06-30 13F FIRSTENERGY COMMON STOCK 337932107 1,433,463 616,511 75.46 57,711 74.77 0.0650
2025-05-15 2025-03-31 13F FIRSTENERGY COMMON STOCK 337932107 816,952 766,254 1,511.41 33,021 1,537.95 0.0419
2025-02-13 2024-12-31 13F FIRSTENERGY COMMON STOCK 337932107 50,698 -3,473 -6.41 2,017 -16.07 0.0024
2024-11-14 2024-09-30 13F FIRSTENERGY COMMON STOCK 337932107 54,171 25,151 86.67 2,402 116.40 0.0029
2024-08-14 2024-06-30 13F FIRSTENERGY COMMON STOCK 337932107 29,020 -195,657 -87.08 1,111 -87.21 0.0015
2024-05-15 2024-03-31 13F FIRSTENERGY COMMON STOCK 337932107 224,677 -138,529 -38.14 8,677 -34.83 0.0132
2024-02-14 2023-12-31 13F FIRSTENERGY COMMON STOCK 337932107 363,206 363,206 13,315 0.0226
2023-11-14 2023-09-30 13F FIRSTENERGY COMMON STOCK 337932107 0 -170,349 -100.00 0 -100.00
2023-08-14 2023-06-30 13F FIRSTENERGY COMMON STOCK 337932107 170,349 170,349 6,623 0.0129
2022-11-14 2022-09-30 13F FIRSTENERGY COMMON STOCK 337932107 0 -380,756 -100.00 0 -100.00
2022-08-15 2022-06-30 13F FIRSTENERGY COMMON STOCK 337932107 380,756 380,756 14,618 0.0301
2022-02-14 2021-12-31 13F FIRSTENERGY COMMON STOCK 337932107 0 -103,758 -100.00 0 -100.00
2021-11-15 2021-09-30 13F FIRSTENERGY COMMON STOCK 337932107 103,758 -31,155 -23.09 3,696 -26.37 0.0153
2021-08-13 2021-06-30 13F FIRSTENERGY COMMON STOCK 337932107 134,913 127,455 1,708.97 5,020 1,838.22 0.0245
2021-05-17 2021-03-31 13F FIRSTENERGY COMMON STOCK 337932107 7,458 -26,175 -77.83 259 -74.85 0.0012
2021-02-16 2020-12-31 13F FIRSTENERGY COMMON STOCK 337932107 33,633 33,633 350.97 1,030 297.68 0.0056
2020-11-16 2020-09-30 13F FIRSTENERGY COMMON STOCK 337932107 0 -22,161 -100.00 0 -100.00
2020-08-13 2020-06-30 13F FIRSTENERGY COMMON STOCK 337932107 22,161 11,771 113.29 859 106.00 0.0060
2020-05-15 2020-03-31 13F FIRSTENERGY COMMON STOCK 337932107 10,390 -33,425 -76.29 417 -80.41 0.0042
2020-02-14 2019-12-31 13F FIRSTENERGY COMMON STOCK 337932107 43,815 -62,989 -58.98 2,129 -58.67 0.0146
2019-11-14 2019-09-30 13F FIRSTENERGY COMMON STOCK 337932107 106,804 52,182 95.53 5,151 120.32 0.0405
2019-08-14 2019-06-30 13F FIRSTENERGY COMMON STOCK 337932107 54,622 -25,941 -32.20 2,338 -30.25 0.0192
2019-05-29 2019-03-31 13F/A-1 FIRSTENERGY COMMON STOCK 337932107 80,563 80,563 47.49 3,352 43.37 0.0315
2019-05-14 2019-03-31 13F FIRSTENERGY COMMON STOCK 337932107 80,563 80,563 3,352
2019-02-14 2018-12-31 13F FIRSTENERGY COMMON STOCK 337932107 0 -16,507 -100.00 0 -100.00
2018-12-06 2018-09-30 13F/A-1 FIRSTENERGY COMMON STOCK 337932107 16,507 16,507 614 0.0052
2018-11-14 2018-09-30 13F FIRSTENERGY COMMON STOCK 337932107 16,507 16,507 614
2018-05-15 2018-03-31 13F FIRSTENERGY COMMON STOCK 337932107 0 -9,456 -100.00 0 -100.00
2018-03-29 2017-12-31 13F/A-1 FIRSTENERGY COMMON STOCK 337932107 9,456 -73 -0.77 290 -1.69 0.0122
2018-02-14 2017-12-31 13F FIRSTENERGY COMMON STOCK 337932107 9,456 -73 290
2017-11-13 2017-09-30 13F FIRSTENERGY COMMON STOCK 337932107 9,529 9,529 0.77 295 1.72 0.0137
2017-02-10 2016-12-31 13F FIRSTENERGY COMMON STOCK 337932107 0 -100,103 -100.00 0 -100.00
2016-11-10 2016-09-30 13F FIRSTENERGY COMMON STOCK 337932107 100,103 -26,965 -21.22 3,311 -25.36 0.0235
2016-08-12 2016-06-30 13F FIRSTENERGY COMMON STOCK 337932107 127,068 127,068 26.94 4,436 33.98 0.0373
2016-05-13 2016-03-31 13F FIRSTENERGY COMMON STOCK 337932107 0 -516,998 -100.00 0 -100.00
2016-02-10 2015-12-31 13F FIRSTENERGY COMMON STOCK 337932107 516,998 516,998 16,404 0.1539
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.