Mammoth Energy Services, Inc.
DE ˙ DB ˙ US56155L1089
2,78 € ↑0,10 (3,73%)
2026-06-01
DELAT PRIS
SecurityDE:5M8 / Mammoth Energy Services, Inc.
InstitutionBarclays Plc
Latest Disclosed Ownership38,064 shares
Latest Disclosed Value $ 70,419
Barclays Plc reports 35.78% decrease in ownership of 5M8 / Mammoth Energy Services, Inc.

On February 13, 2026 - Barclays Plc filed a 13F-HR form disclosing ownership of 38,064 shares of Mammoth Energy Services, Inc. (DE:5M8) valued at $57,477 USD as of December 31, 2025. The entity filed a previous 13F-HR/A on March 31, 2026 disclosing 59,269 shares of Mammoth Energy Services, Inc.. This represents a change in shares of -35.78% during the quarter. The current value of the position is $105,818 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 MAMMOTH ENERGY SVCS COM 56155L108 38,064 -21,205 -35.78 70 -48.15 0.0000
2026-03-31 2025-09-30 13F/A-3 MAMMOTH ENERGY SVCS COM 56155L108 59,269 -7,279 -10.94 136 -27.42 0.0000
2026-03-19 2025-09-30 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 57,081 -9,467 233 0.0001
2025-11-12 2025-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 59,269 -7,279 136 0.0000
2026-02-27 2025-06-30 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 66,548 17,027 34.38 186 84.16 0.0000
2025-08-14 2025-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 66,548 17,027 0 0.0000
2025-08-13 2025-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 66,548 17,027 0 0.0000
2026-03-17 2025-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 49,521 -12,028 -19.54 101 -45.11 0.0000
2025-05-15 2025-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 49,521 -12,028 0 0.0000
2026-03-19 2024-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 61,549 4,468 7.83 185 -21.03 0.0001
2025-02-13 2024-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 61,549 4,468 0 0.0001
2026-03-31 2024-09-30 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 57,081 22,503 65.08 233 106.19 0.0001
2024-11-19 2024-09-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 57,081 22,503 0 0.0001
2024-11-15 2024-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 57,081 22,503 0 0.0001
2026-03-23 2024-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 34,578 -6,845 -16.52 113 -24.67 0.0000
2024-08-14 2024-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 34,578 -6,845 0 0.0000
2026-03-24 2024-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 41,423 -16,304 -28.24 151 -41.63 0.0001
2024-05-15 2024-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 41,423 -16,304 0 0.0001
2026-03-25 2023-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 57,727 28,553 97.87 257 90.37 0.0001
2024-02-15 2023-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 57,727 28,553 0 0.0001
2026-03-26 2023-09-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 29,174 -500 -1.68 135 -5.59 0.0001
2023-11-07 2023-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 29,174 -500 0 0.0001
2026-03-30 2023-06-30 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 29,674 -21,815 -42.37 143 -34.10 0.0001
2023-09-20 2023-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 29,674 -21,815 0 0.0001
2023-08-03 2023-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 29,674 -21,815 0 0.0001
2026-03-30 2023-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 51,489 1,489 2.98 217 -49.77 0.0001
2023-05-04 2023-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 51,489 1,489 0 0.0001
2026-03-30 2022-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 50,000 47,199 1,685.08 432 4,220.00 0.0002
2023-02-13 2022-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 50,000 47,199 0 0.0002
2022-11-03 2022-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 2,801 526 23.12 10 100.00 0.0000
2022-08-12 2022-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 2,275 -597 -20.79 5 -16.67 0.0000
2022-05-16 2022-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 2,872 0 0.00 6 20.00 0.0000
2022-02-23 2021-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 2,872 -162 -5.34 5 -37.50 0.0000
2022-02-14 2021-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 2,872 -162 5 0.0000
2021-11-09 2021-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 3,034 162 5.64 8 -38.46 0.0000
2021-08-13 2021-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 2,872 546 23.47 13 8.33 0.0000
2021-05-13 2021-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 2,326 2,326 12 0.0000
2020-11-12 2020-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 0 -3,582 -100.00 0 -100.00
2020-08-12 2020-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 3,582 -676 -15.88 4 33.33 0.0000
2020-05-13 2020-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 4,258 -9,099 -68.12 3 -90.00 0.0000
2020-02-10 2019-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 13,357 6,018 82.00 30 66.67 0.0000
2019-11-15 2019-09-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 7,339 -2,007 -21.47 18 -72.31 0.0000
2019-11-14 2019-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 7,339 -2,007 18 4.1616
2019-08-14 2019-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 9,346 -43,368 -82.27 65 -92.60 0.0000
2019-05-15 2019-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 52,714 5,607 11.90 878 3.78 0.0006
2019-02-14 2018-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 47,107 16,688 54.86 846 -4.41 0.0007
2018-11-14 2018-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 30,419 26,312 640.66 885 536.69 0.0006
2018-08-14 2018-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 4,107 -1,554 -27.45 139 -23.63 0.0001
2018-05-15 2018-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 5,661 4,385 343.65 182 628.00 0.0001
2018-02-14 2017-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,276 1,089 582.35 25 733.33 0.0000
2017-11-14 2017-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 187 -25,202 -99.26 3 -99.37 0.0000
2017-08-14 2017-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 25,389 13,777 118.64 473 89.96 0.0005
2017-05-15 2017-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 11,612 11,465 7,799.32 249 12,350.00 0.0003
2017-02-14 2016-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 147 147 2 0.0000
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.