StockCIK 1679268
MAMMOTH ENERGY SERVICES, INC. (TUSK): Insider Trades and Fund Holdings
In the past 12 months, MAMMOTH ENERGY SERVICES, INC. insiders reported 1 open-market purchase worth $15K and 0 sales worth $0.
1Insider buys, 12 months
$15KBought by insiders, 12 months
$0Sold by insiders, 12 months
1Tracked funds holding
Timeline: news and trades
Company filings (8-K), insider trades, notices of planned sales (Form 144) and fund moves in the past year, newest first.
- Sep 16, 2026Insider buyDirector Mark Lawrence Plaumann bought $15,000
- Jun 30, 2026FundRenaissance Technologies added 26% in Q2 2026 (13F filed Aug 13, 2026)
Recent insider trades
Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Sep 17, 2026.
| Filed | Insider | Type | Value |
|---|---|---|---|
| Sep 17 | Mark Lawrence PlaumannDirector | ▲ BUY | $15K |
Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings
Insiders who traded in the past year
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Mark Lawrence Plaumann | Director | 1 | $15K | 0 | $0 |
Tracked funds that report TUSK
From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.
| Fund | Shares | Value | Change |
|---|---|---|---|
| Renaissance Technologies | 292,280 | $950K | ▲ +26.0% |
Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings
Reading these numbers
Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →