As of the latest Form 4 filed Jul 1, 2026.
What Mammoth Energy Services Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 13 most recent filings for TUSK.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-07-01 | 2026-06-26 | Lancaster Phillip Director | JOther | +68.2K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | Jacobi Paul M. Chief Business Officer | JOther | +3.21K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | Amron Arthur H Director | JOther | +10.3K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | Amron Arthur H, Director | JOther | +19.1K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | WEXFORD CAPITAL LP Chief Business Officer | PPurchase | +4.02M | $2.60 | $10.5M | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | WEXFORD CAPITAL LP, Chief Business Officer | JOther | +6.35M | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | WEXFORD CAPITAL LP, Chief Business Officer | JOther | +1.07M | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | DAVIDSON CHARLES E 10% owner | JOther | +4.07M | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-22 | 2026-06-17 | DAVIDSON CHARLES E, 10% owner | JOther | +2.40M | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-15 | 2026-06-12 | Amron Arthur H Director | PPurchase | +2.00K | $3.28 | $6.56K | No | Form 4 ↗ |
| 2026-06-15 | 2026-06-11 | Amron Arthur H, Director | PPurchase | +2.50K | $3.22 | $8.05K | No | Form 4 ↗ |
| 2026-05-28 | 2026-05-28 | Amron Arthur H Director | PPurchase | +3.00K | $3.25 | $9.75K | No | Form 4 ↗ |
| 2026-05-28 | 2026-05-26 | Amron Arthur H, Director | PPurchase | +2.50K | $3.24 | $8.10K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also TUSK’s full analysis or the market-wide insider trading feed. The tabs above jump to TUSK’s other SEC data.
Source: SEC Form 4 filings for TUSK, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.