TUSK 8-K: Executive departure

Filed with the SEC on Nov 13, 2026 · accession 0001628280-26-073569

TUSK filed a 8-K (current report) with the SEC on Nov 13, 2026. Mammoth Energy Services appointed Bernard "Bernie" Lancaster, previously Chief Operating Officer, as President effective November 9, 2026, and he ceased serving as COO.

Summary of the filing

Mammoth Energy Services appointed Bernard "Bernie" Lancaster, previously Chief Operating Officer, as President effective November 9, 2026, and he ceased serving as COO. His compensation arrangements were unchanged.

For details, click here →How to read a 8-K →

Key details

RegistrantMammoth Energy Services, Inc.

President (formerly chief operating officer)Bernard Lancaster

Board memberPhil Lancaster

Chief financial officer and secretaryMark Layton

✦ Ask GOAX AI about this filing — what it means for TUSK, what changed since its last filings and what to watch next.

Try it free for 7 days

🔔 Want to stay updated on new SEC filings for TUSK?

Click here

Frequently asked questions

What did TUSK file with the SEC on Nov 13, 2026?

TUSK filed a 8-K (Executive departure). Mammoth Energy Services appointed Bernard "Bernie" Lancaster, previously Chief Operating Officer, as President effective November 9, 2026, and he ceased serving as COO. His compensation arrangements were unchanged.

What does a executive departure mean for TUSK stock?

Not always. A planned retirement with a successor is usually calm; a sudden departure “effective immediately”, especially of a CFO or near results, often worries investors.

How do I read a 8-K?

A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The "Item" number tells you the topic (e.g. 2.02 results, 5.02 executive change, 1.01 new agreement, 1.03 bankruptcy). Exhibits (99.1 press release) usually hold the details.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 8-K (current report): A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more.

Other TUSK SEC filings

Get alerts when TUSK files with the SEC, plus live charts, key levels and news for 13,000+ stocks.

Try SEPT free for 7 days

TUSK overview TUSK analysis TUSK news Latest SEC filings