Mammoth Energy Services, Inc.
DE ˙ DB ˙ US56155L1089
2,78 € ↑0,10 (3,73%)
2026-06-01
PREZZO DELLE AZIONI
SecurityDE:5M8 / Mammoth Energy Services, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership421,922 shares
Latest Disclosed Value $ 1,033,709
State Street Corp reports 3.29% increase in ownership of 5M8 / Mammoth Energy Services, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 421,922 shares of Mammoth Energy Services, Inc. (DE:5M8) valued at $928,228 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 408,484 shares of Mammoth Energy Services, Inc.. This represents a change in shares of 3.29% during the quarter. The current value of the position is $1,172,943 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 421,922 13,438 3.29 1,034 36.82 0.0000
2026-02-13 2025-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 408,484 1,568 0.39 756 -18.90 0.0000
2025-11-14 2025-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 406,916 -1,847 -0.45 932 -18.62 0.0000
2025-08-14 2025-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 408,763 6,400 1.59 1,145 39.51 0.0000
2025-05-15 2025-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 402,363 0 0.00 821 -32.06 0.0000
2025-02-14 2024-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 402,363 -1,325 -0.33 1,207 -26.89 0.0000
2024-11-14 2024-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 403,688 5,400 1.36 1,651 26.42 0.0001
2024-08-14 2024-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 398,288 -9,378 -2.30 1,306 -11.94 0.0001
2024-05-15 2024-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 407,666 2,600 0.64 1,484 -17.88 0.0001
2024-02-14 2023-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 405,066 -9,540 -2.30 1,807 -6.08 0.0001
2023-11-14 2023-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 414,606 1,400 0.34 1,924 -3.61 0.0001
2023-08-14 2023-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 413,206 334,492 424.95 1,996 500.90 0.0001
2023-05-15 2023-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 78,714 16,100 25.71 332 -38.63 0.0000
2023-05-15 2022-12-31 13F/A-99 MAMMOTH ENERGY SVCS COM 56155L108 62,614 9,000 16.79 542 195.63 0.0000
2023-05-15 2022-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 62,614 9,000 542 0.0000
2022-11-15 2022-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 53,614 0 0.00 183 55.08 0.0000
2022-08-15 2022-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 53,614 -17,100 -24.18 118 -21.85 0.0000
2022-05-16 2022-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 70,714 0 0.00 151 17.05 0.0000
2022-02-14 2021-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 70,714 0 0.00 129 -37.38 0.0000
2021-11-15 2021-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 70,714 18,307 34.93 206 -14.52 0.0000
2021-08-16 2021-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 52,407 41,507 380.80 241 315.52 0.0000
2021-07-09 2021-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 10,900 10,900 58 0.0000
2021-05-17 2021-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 10,900 10,900 58 0.0000
2020-08-14 2020-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 0 -251,860 -100.00 0 -100.00
2020-06-19 2020-03-31 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 251,860 -57,669 -18.63 189 -72.25 0.0000
2020-05-11 2020-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 251,860 -57,669 189 16.5980
2020-02-06 2019-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 309,529 -11,172 -3.48 681 -14.34 0.0000
2019-11-14 2019-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 320,701 76,092 31.11 795 -52.76 0.0001
2019-08-14 2019-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 244,609 11,556 4.96 1,683 -56.62 0.0001
2019-05-15 2019-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 233,053 -4,204 -1.77 3,880 -9.05 0.0003
2019-02-12 2018-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 237,257 19,858 9.13 4,266 -32.57 0.0004
2018-11-09 2018-09-30 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 217,399 54,583 33.52 6,327 14.43 0.0005
2018-08-14 2018-06-30 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 162,816 23,745 17.07 5,529 24.08 0.0005
2018-05-15 2018-03-31 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 139,071 13,540 10.79 4,456 80.84 0.0004
2018-02-14 2017-12-31 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 125,531 10,385 9.02 2,464 27.01 0.0002
2017-11-14 2017-09-30 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 115,146 900 0.79 1,940 -8.79 0.0002
2017-08-14 2017-06-30 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 114,246 16,965 17.44 2,127 1.58 0.0002
2017-05-15 2017-03-31 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 97,281 23,360 31.60 2,094 86.30 0.0002
2017-02-09 2016-12-31 13F MAMMOTH ENERGY SERVICES Common equity shares 56155L108 73,921 73,921 1,124 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.