Mammoth Energy Services (TUSK)Director bought ~$10.5M

~$10.5M

Approx. value · 4.02M sh @ $2.60

10.6M

Holds after · shares reported

Traded

Jun 17, 2026

Filed

Jun 22, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. May 11, 2026Company filing · Form 8-K · ResultsReported its results
2. May 13, 2026Company filing · Form 8-K · Auditor changeChanged its auditor“On May 13, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Mammoth Energy Services, Inc. (the “Company”) approved the dismissal of Deloitte & Touche LLP (“Deloitte”) as the Company’s independent registered public accounting firm.”
3. May 26, 2026InsiderDirector purchased ~$8.1K of TUSK shares in the open market
4. May 28, 2026InsiderDirector purchased ~$9.8K of TUSK shares in the open market
5. Jun 11, 2026InsiderDirector purchased ~$8K of TUSK shares in the open market
6. Jun 12, 2026InsiderDirector purchased ~$6.6K of TUSK shares in the open market
7. Jun 17, 2026 · this disclosureInsider · Largest insider buy since 2016Director purchased ~$10.5M of TUSK shares in the open market

What came next

1. Aug 7, 2026Company filing · Form 8-K · Results, Reg FDReported its results, and shared information with investors
2. Sep 16, 2026Insider · Their first buy on recordDirector purchased ~$15K of TUSK shares in the open market

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Mammoth Energy Services

For Mammoth Energy Services, OQRO holds 1 insider filing (SEC Form 4 or Form 144) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its TUSK page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Mammoth Energy Services

• SEC Form 4Sep 17, 2026
• SEC Form 4Jun 15, 2026
• SEC Form 4Jun 15, 2026
• SEC Form 4May 28, 2026
• SEC Form 4May 28, 2026
• SEC Form 4Dec 15, 2025

Everything OQRO holds on this company is on its TUSK page.