Mammoth Energy Services, Inc.
DE ˙ DB ˙ US56155L1089
2,78 € ↑0,10 (3,73%)
2026-06-01
DEL PRIS
SecurityDE:5M8 / Mammoth Energy Services, Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership1,454,839 shares
Latest Disclosed Value $ 3,564,356
BlackRock, Inc. reports 1.24% decrease in ownership of 5M8 / Mammoth Energy Services, Inc.

On May 13, 2026 - BlackRock, Inc. filed a 13F-HR form disclosing ownership of 1,454,839 shares of Mammoth Energy Services, Inc. (DE:5M8) valued at $3,200,646 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,473,044 shares of Mammoth Energy Services, Inc.. This represents a change in shares of -1.24% during the quarter. The current value of the position is $4,044,452 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)
2026-05-13 2026-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,454,839 -18,205 -1.24 3,564 30.79 0.0000
2026-02-12 2025-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,473,044 20,581 1.42 2,725 -18.07 0.0000
2025-11-12 2025-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 1,452,463 -16,636 -1.13 3,326 -19.13 0.0001
2025-08-12 2025-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 1,469,099 8,302 0.57 4,113 38.02 0.0001
2025-05-02 2025-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,460,797 -15,088 -1.02 2,980 -32.69 0.0001
2025-02-07 2024-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,475,885 11,773 0.80 4,428 -26.07 0.0001
2024-11-13 2024-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 1,464,112 53,948 3.83 5,988 29.47 0.0001
2024-08-13 2024-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 1,410,164 -33,451 -2.32 4,625 -11.97 0.0001
2024-05-10 2024-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,443,615 -53,330 -3.56 5,255 -21.30 0.0001
2024-02-13 2023-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 1,496,945 120,935 8.79 6,676 4.57 0.0002
2023-11-13 2023-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 1,376,010 95,769 7.48 6,385 3.25 0.0002
2023-08-11 2023-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 1,280,241 1,020,681 393.24 6,184 464.66 0.0002
2023-05-12 2023-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 259,560 15,616 6.40 1,095 -48.10 0.0000
2023-02-13 2022-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 243,944 6,481 2.73 2,110 160.49 0.0001
2022-11-14 2022-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 237,463 130 0.05 810 55.17 0.0000
2022-08-12 2022-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 237,333 8,135 3.55 522 6.97 0.0000
2022-05-12 2022-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 229,198 -1,368 -0.59 488 16.19 0.0000
2022-02-10 2021-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 230,566 6,561 2.93 420 -35.48 0.0000
2021-11-09 2021-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 224,005 22,490 11.16 651 -29.62 0.0000
2021-08-11 2021-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 201,515 -84,662 -29.58 925 -39.22 0.0000
2021-05-07 2021-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 286,177 -22,521 -7.30 1,522 10.77 0.0000
2021-02-05 2020-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 308,698 15,570 5.31 1,374 192.96 0.0000
2020-11-06 2020-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 293,128 -1,203 -0.41 469 35.16 0.0000
2020-08-14 2020-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 294,331 -575,279 -66.15 347 -46.70 0.0000
2020-05-01 2020-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 869,610 -4,355 -0.50 651 -66.11 0.0000
2020-02-13 2019-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 873,965 -16,291 -1.83 1,921 -12.96 0.0001
2019-11-08 2019-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 890,256 27,235 3.16 2,207 -62.83 0.0001
2019-08-22 2019-06-30 13F/A-1 MAMMOTH ENERGY SVCS COM 56155L108 863,021 21,553 2.56 5,937 -57.62 0.0003
2019-08-13 2019-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 863,021 21,553 5,937
2019-05-09 2019-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 841,468 47,089 5.93 14,010 -1.92 0.0006
2019-02-08 2018-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 794,379 16,266 2.09 14,284 -36.91 0.0007
2018-11-09 2018-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 778,113 92,155 13.43 22,642 -2.80 0.0010
2018-08-09 2018-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 685,958 187,868 37.72 23,295 45.88 0.0011
2018-05-09 2018-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 498,090 49,696 11.08 15,969 81.45 0.0008
2018-02-09 2017-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 448,394 -16,440 -3.54 8,801 12.30 0.0004
2017-11-14 2017-09-30 13F MAMMOTH ENERGY SVCS COM 56155L108 464,834 -47,265 -9.23 7,837 -17.71 0.0004
2017-08-10 2017-06-30 13F MAMMOTH ENERGY SVCS COM 56155L108 512,099 46,993 10.10 9,524 -4.82 0.0005
2017-05-12 2017-03-31 13F MAMMOTH ENERGY SVCS COM 56155L108 465,106 459,460 8,137.80 10,006 11,534.88 0.0005
2017-02-10 2016-12-31 13F MAMMOTH ENERGY SVCS COM 56155L108 5,646 5,646 86 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.