Mammoth Energy Services, Inc.
DE ˙ DB ˙ US56155L1089
2,78 € ↑0,10 (3,73%)
2026-06-01
AKTIENPREIS
SecurityDE:5M8 / Mammoth Energy Services, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership152,723 shares
Latest Disclosed Value $ 374,172
Morgan Stanley reports 47.82% decrease in ownership of 5M8 / Mammoth Energy Services, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 152,723 shares of Mammoth Energy Services, Inc. (DE:5M8) valued at $335,991 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 292,698 shares of Mammoth Energy Services, Inc.. This represents a change in shares of -47.82% during the quarter. The current value of the position is $424,570 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 MAMMOTH ENERGY SVCS COM 56155L108 152,723 -139,975 -47.82 374 -30.87 0.0000
2026-05-27 2025-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 292,698 147,398 101.44 541 62.95 0.0000
2026-02-13 2025-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 292,698 147,398 541 0.0000
2026-05-27 2025-09-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 145,300 -39,960 -21.57 333 -35.91 0.0000
2025-11-14 2025-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 145,300 -39,960 333 0.0000
2025-08-15 2025-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 185,260 94,026 103.06 519 178.49 0.0000
2025-05-15 2025-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 91,234 255 0.28 186 -31.62 0.0000
2025-05-15 2024-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 90,979 2,163 2.44 273 -25.07 0.0000
2025-02-14 2024-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 90,979 2,163 273 0.0000
2025-05-14 2024-09-30 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 88,816 38,893 77.91 363 122.70 0.0000
2025-02-14 2024-09-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 88,816 38,893 363 0.0000
2024-11-14 2024-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 88,816 38,893 363 0.0000
2025-05-14 2024-06-30 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 49,923 -3,030 -5.72 164 -15.10 0.0000
2024-10-17 2024-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 49,923 -3,030 164 0.0000
2024-08-14 2024-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 49,923 -3,030 164 0.0000
2024-10-17 2024-03-31 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 52,953 -2,216 -4.02 193 -21.95 0.0000
2024-08-16 2024-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 52,953 -2,216 193 0.0000
2024-05-15 2024-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 52,953 -2,216 193 0.0000
2024-08-16 2023-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 55,169 18,751 51.49 246 46.43 0.0000
2024-02-13 2023-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 55,169 18,751 246 0.0000
2023-11-15 2023-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 36,418 -6,296 -14.74 169 -18.45 0.0000
2023-08-14 2023-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 42,714 -11,792 -21.63 206 -10.43 0.0000
2023-05-15 2023-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 54,506 31,176 133.63 230 14.43 0.0000
2023-02-14 2022-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 23,330 16,769 255.59 202 813.64 0.0000
2022-11-14 2022-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 6,561 -4,027 -38.03 22 -4.35 0.0000
2022-10-27 2022-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 10,588 -4,675 -30.63 23 -28.12 0.0000
2022-08-15 2022-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 10,588 -4,675 23 0.0000
2022-10-27 2022-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 15,263 7,475 95.98 32 128.57 0.0000
2022-05-13 2022-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 15,263 7,475 32 0.0000
2022-02-14 2021-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 7,788 -18,942 -70.86 14 -81.82 0.0000
2021-11-15 2021-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 26,730 -36,338 -57.62 77 -73.45 0.0000
2021-08-23 2021-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 63,068 62,991 81,806.49 290 0.0000
2021-08-16 2021-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 63,068 62,991 290 0.0000
2021-05-17 2021-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 77 -10,379 -99.26 0 -100.00
2021-02-16 2020-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 10,456 10,379 13,479.22 47 0.0000
2020-11-13 2020-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 77 -4,370 -98.27 0 -100.00
2020-08-14 2020-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 4,447 3,132 238.17 5 400.00 0.0000
2020-05-26 2020-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 1,315 -177,547 -99.26 1 -99.74 0.0000
2020-05-15 2020-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,315 -177,547 1 0.0768
2020-02-14 2019-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 178,862 -629,651 -77.88 392 -80.44 0.0001
2019-11-14 2019-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 808,513 714,072 756.10 2,004 208.78 0.0005
2019-08-14 2019-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 94,441 82,895 717.95 649 238.02 0.0002
2019-05-15 2019-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 11,546 -15,813 -57.80 192 -61.05 0.0001
2019-02-14 2018-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 27,359 -13,659 -33.30 493 -58.71 0.0001
2019-04-23 2018-09-30 13F/A-2 MAMMOTH ENERGY SVCS COM 56155L108 41,018 -15,803 -27.81 1,194 -38.13 0.0003
2018-11-20 2018-09-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 41,018 0 1,194 0.0003
2018-11-14 2018-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 41,018 -15,803 1,194
2019-04-23 2018-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 56,821 -38,324 -40.28 1,930 -36.74 0.0005
2018-08-14 2018-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 56,821 -38,324 1,930
2019-04-23 2018-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 95,145 65,998 226.43 3,051 433.39 0.0008
2018-05-14 2018-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 95,145 65,998 3,051
2019-04-23 2017-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 29,147 13,623 87.75 572 119.16 0.0002
2018-02-14 2017-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 29,147 13,623 572
2017-11-14 2017-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 15,524 -10,940 -41.34 261 -46.95 0.0001
2017-08-11 2017-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 26,464 14,238 116.46 492 87.07 0.0001
2017-05-22 2017-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 12,226 -11,860 -49.24 263 -28.14 0.0001
2017-05-12 2017-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 12,226 263
2017-02-22 2016-12-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 24,086 24,086 366 0.0001
2017-02-13 2016-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 24,086 366 0.0001
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.