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TUSK customer relationships

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Mammoth Energy (TUSK) — Customer Map and Investment Implications

Mammoth Energy Services monetizes through a mix of project-driven infrastructure contracts, short-term master service agreements for well completion and drilling, and manufacturing and logistics of frac sand (proppant) for oil and gas customers. Revenue comes from engineering and grid repair projects to investor-owned utilities and cooperatives, last-mile sand distribution and mining/processing of premium sand, and episodic emergency contracts — a hybrid model that drives outsized revenue volatility but also delivers high customer concentration and occasional large receivables. For a quick navigation of Mammoth’s customer footprint and how it translates to credit and operational risk, visit Null Exposure: https://nullexposure.com/.

How Mammoth wins business and how that shapes risk

Mammoth operates as both a service provider (infrastructure, engineering, warranties) and a manufacturer/distributor (natural sand proppant and logistics). The company sells under two principal contracting postures: short-duration, cancellable work and framework master services agreements (MSAs) that provide repeat project opportunity but rarely guaranteed volumes. The 2024 Form 10‑K emphasizes that many MSAs give customers the right to assign work on a project-by-project basis with no firm commitment, and that numerous contracts are cancellable on 30–90 days’ notice. That contracting mix produces volatile revenue timing, increases the importance of top customers, and elevates working-capital risk when large project receivables are concentrated.

Company-level signals from the filings and news include:

  • High customer concentration: top five customers made up roughly 34% of revenue in 2024, which amplifies counterparty risk across all segments.
  • Government exposure and collection risk: infrastructure work to public bodies can create large receivables and protracted recoveries.
  • Short-term and framework contracting: MSAs are common in completions and infrastructure but often lack volume guarantees, limiting revenue visibility.
  • Segmented revenue mix: Mammoth runs manufacturing (proppant), distribution (sand hauling/logistics), and infrastructure businesses concurrently, creating operational complexity.

Explore a consolidated view of these customer signals at Null Exposure: https://nullexposure.com/.

Customer relationships — what the filings and press disclose

Below are every relationship mentioned in the collected records, each paired with a concise one- or two-sentence summary and its source.

San Diego Gas & Electric Company

Mammoth lists San Diego Gas & Electric among its customers as part of a broader roster of utilities served in recent years, indicating engagement in infrastructure or grid-related projects. This disclosure is from Mammoth’s Form 10‑K covering fiscal 2024.

Source: Mammoth Energy Services, Form 10‑K (FY2024).

Apex Energy Services

Apex Energy Services is included in Mammoth’s customer list in the 2024 annual report, reflecting Mammoth’s exposure to oilfield/completion service counterparty relationships. The mention appears in the company’s FY2024 10‑K customer roster.

Source: Mammoth Energy Services, Form 10‑K (FY2024).

Kentucky Utilities Company

Kentucky Utilities is named among Mammoth’s customers in the 2024 filing, underscoring the company’s work with regional investor‑owned utilities. This is documented in the Form 10‑K for the year ended December 31, 2024.

Source: Mammoth Energy Services, Form 10‑K (FY2024).

Oncor Electric Delivery Company, LLC

Oncor is cited as a customer in the 2024 annual report, consistent with Mammoth’s strategy of contracting with large regional electric delivery companies for infrastructure services. See Mammoth’s FY2024 10‑K disclosure.

Source: Mammoth Energy Services, Form 10‑K (FY2024).

Puerto Rico Electric Power Authority (PREPA) — Form 10‑K reference

Mammoth (through Cobra) executed emergency master services agreements with PREPA for Hurricane Maria repairs; these contracts were one‑year agreements with very large notional values, and PREPA had outstanding receivables as of December 31, 2024. The 10‑K documents the historical master services agreements and remaining receivable balance.

Source: Mammoth Energy Services, Form 10‑K (FY2024).

PREPA — Globe and Mail / Motley transcript note

Management publicly acknowledged that PREPA-related receivables previously generated bad debt expense, demonstrating that PREPA exposure has flowed through to corporate earnings and provisioning. This was noted in Q4 2025 earnings commentary covered by The Globe and Mail’s Motley transcript.

Source: The Globe and Mail / Motley Q4 2025 earnings transcript coverage (reported March 2026).

Qualus, LLC — OKEnergyToday sale notice

Qualus acquired Mammoth’s Aquawolf subsidiary in a transaction described as a cash sale, signaling Mammoth’s reduction of certain non-core holdings and counterparty change as part of portfolio restructuring. OK Energy Today reported the completed sale of Aquawolf to Qualus for $30 million (December 2025 reporting).

Source: OK Energy Today, sale announcement (Dec 2025 / reported March 2026).

Qualus, LLC — MarketScreener conference notice

MarketScreener similarly reported that Qualus acquired Aquawolf (noting a reported $26–30 million consideration), corroborating the divestiture and the counterparty relationship for that specific disposal. See the MarketScreener announcement referencing the Q3 2025 conference call.

Source: MarketScreener, Mammoth announcement (Dec 2025 / posted March 2026).

Gulfport Energy (GPOR)

Historical litigation: Gulfport sued to terminate its services agreement with Mammoth’s Stingray Pressure Pumping subsidiary, reflecting a past commercial dispute that represents precedent for counterparty legal risk in the completion business. Coverage was provided by OK Energy Today in 2021.

Source: OK Energy Today, reporting on litigation and settlements (Sept 2021).

PREPA — OK Energy Today (collection and covenant implications)

OK Energy Today reported in 2021 that PREPA owed Cobra (Mammoth’s subsidiary) approximately $325.1 million as of August 31, 2021 and that lack of payment risked covenant breaches under Mammoth’s credit facilities, illustrating the scale and financial impact of that specific government counterparty exposure.

Source: OK Energy Today, investigative coverage of PREPA receivable and covenant risk (Sept 2021).

Peak Utility Services Group, Inc.

Peak Utility Services Group acquired certain Mammoth subsidiary holdings in a transaction reported at $109 million, and the sale prompted leadership changes at Mammoth, indicating a client/transaction counterpart and a strategic reorganization. OK Energy Today covered the transaction and executive updates in mid‑2025.

Source: OK Energy Today, transaction and executive change reporting (June 2025).

Duke Energy (DUK)

Duke Energy is identified in Mammoth’s 2024 customer list, placing a major investor‑owned utility among Mammoth’s top counterparties and reinforcing the company’s footprint across large U.S. electric utilities. This is cited in the FY2024 10‑K.

Source: Mammoth Energy Services, Form 10‑K (FY2024).

PREPA — InsiderMonkey earnings call excerpt

Management commentary in Q4 2025 earnings materials notes that excluding PREPA-related bad debt in 2024, normalized SG&A declined meaningfully, which highlights PREPA’s outsized impact on reported operating results and expense normalization. This was captured in an earnings call transcript summarized by InsiderMonkey.

Source: InsiderMonkey earnings call transcript summary (Q4 2025 / reported March 2026).

What these relationships mean for investors

  • Concentration risk is material. The top five customers drove roughly one‑third of revenue in 2024, so losses or payment issues with one large counterparty will materially affect cash flow and leverage metrics.
  • Government receivables are high‑impact. PREPA is the clear outlier: emergency MSAs produced large notional contracts, a lengthy collection process, and explicit bad‑debt impacts that have affected covenant headroom. The filings document both the one‑year emergency contracts and the multi‑year recovery and settlement process. PREPA represents both credit risk and cash‑flow volatility.
  • Contracting posture reduces revenue visibility. The coexistence of cancellable short‑term contracts and non‑committal MSAs creates a runway that is highly sensitive to commodity cycles and project cadence. Revenue is lumpy by design.
  • Diversified business lines add operational complexity. Mammoth runs manufacturing (proppant), distribution (trucking), and infrastructure segments concurrently, which increases capex and working‑capital management challenges but also gives optionality to reallocate capacity.
  • Event risks and legal precedent are real. Past litigation (Gulfport) and divestitures (Aquawolf sale to Qualus, divestment to Peak) show the company both shedding assets and litigating commercial disputes — both relevant for credit analysis and future M&A considerations.

If you want a synthesized counterparty risk scorecard or a direct feed of these citations for modeling, start here: https://nullexposure.com/. For enterprise subscribers seeking a mapped view of TUSK’s customer exposures and covenant‑level stress testing, visit https://nullexposure.com/ for the full product suite.

Final perspective and next steps

Mammoth’s customer list reads like a blueprint of project-based revenue with concentrated counterparties and occasional government collection shock events. Investors should prioritize monitoring PREPA receivable resolution, the stability of top five customer relationships, and the evolution of MSAs into recurring, committed work. For a direct look at TUSK counterparty mapping and to convert these signals into portfolio decisions, go to https://nullexposure.com/.