TUSK
MAMMOTH ENERGY SERVICES, INC. · Mining · Market cap $144.9M
Insiders bought $10.5M net in the last 90 days ·0 sellers, 2 buyers· latest Form 4 filed Sep 17, 2026
Insider Buying
$10.5M
reported purchases (SEC code P)
Insider Selling
$0
reported sales (SEC code S)
Unique Insiders
3
in the rolling window
Latest filing
Sep 17, 2026
Plaumann Mark Lawrence
MAMMOTH ENERGY SERVICES, INC. (TUSK) has 9 SEC Form 4 filings (15 transaction rows) in the rolling window, disclosed by 3 distinct insiders. Most recent filing: Sep 17, 2026.
Inside the rolling window, 3 insiders at MAMMOTH ENERGY SERVICES, INC. reported 7 open-market purchases totaling $10.5M and no open-market sales. The most active filer is Director Amron Arthur H with 5 filings. Insiders have net bought $10.5M over the trailing 6 months. The largest single insider purchase in this window was $10.5M by Chief Business Officer WEXFORD CAPITAL LP on Jun 17, 2026. The most recent open-market filing is a purchase of 5,000 shares by Director Plaumann Mark Lawrence, dated Sep 16, 2026, worth $15K.
- Industry:Conglomerates
- CEO:Mark Layton
- Employees:115
- HQ:Oklahoma City, OK, US
- IPO:2016-10-14
| Source | |||||||
|---|---|---|---|---|---|---|---|
| Director | Purchase | 5,000 | $15K | Sep 17 | -6.5% | SEC ↗ | |
WEXFORD CAPITAL LPFirst filing | Chief Business Officer | Purchase | 4,019,574 | $10.5M | Jun 22 | +3.1% | SEC ↗ |
| Director | Purchase | 2,500 | $8K | Jun 15 | -2.6% | SEC ↗ | |
| Director | Purchase | 2,000 | $7K | Jun 15 | -2.6% | SEC ↗ | |
Amron Arthur HFirst in 5 months | Director | Purchase | 2,500 | $8K | May 28 | -6.2% | SEC ↗ |
Amron Arthur HFirst in 5 months | Director | Purchase | 3,000 | $10K | May 28 | -6.2% | SEC ↗ |
Amron Arthur HFirst filing | Director | Purchase | 10,000 | $19K | Dec 15 | +74.0% | SEC ↗ |
Frequently asked questions
How many SEC Form 4 insider filings does TUSK have?
MAMMOTH ENERGY SERVICES, INC. (TUSK) has 9 SEC Form 4 filings (15 transaction rows) in the rolling 365-day window, disclosed by 3 distinct insiders. Most recent filing: Sep 17, 2026.
When was the most recent SEC Form 4 filing for TUSK?
The most recent Form 4 filing for TUSK on Tracefour is dated Sep 17, 2026.
Who is the most active insider at TUSK?
The most active SEC Form 4 filer at TUSK in the rolling window is Director Amron Arthur H, with 5 filings.
What is the net insider flow at TUSK over the last 6 months?
Over the trailing 180 days, insiders at TUSK have net bought $10.5M based on SEC Form 4 disclosures.
What was the largest insider purchase at TUSK?
The largest single insider open-market purchase at TUSK in the rolling window was $10.5M by Chief Business Officer WEXFORD CAPITAL LP on 2026-06-17.
What is the total insider buy and sell value at TUSK in the current window?
Inside the rolling window, insiders at TUSK bought $10.5M and sold $0 based on SEC Form 4 filings.
Can I get alerts for TUSK insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at MAMMOTH ENERGY SERVICES, INC. (TUSK). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
MAMMOTH ENERGY SERVICES, INC. is in the Mining sector.