TUSK · Insider trading · 13F holders · Congress trades
Mammoth Energy Services, Inc. (TUSK)
Who is buying and selling TUSK: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 3
- Insider buys, 90 days
- $15K
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
TUSK at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 1 TUSK insider filed 1 open-market purchase worth $15K on SEC Form 4.
- 3 13F filers hold TUSK among their 50 largest positions, worth $42.6M combined. The biggest bets by portfolio weight are Wexford Capital LP (5.4%), Peapod Lane Capital LLC (1.6%) and Johns Hopkins University (0.1%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
- No member of Congress has disclosed a trade in TUSK.
- TUSK last closed at $2.91 on Oct 29, 2026.
TUSK insider trading
Between Aug 1, 2026 and Oct 29, 2026, 1 TUSK insider filed 1 open-market purchase worth $15K on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Plaumann Mark Lawrence | Director | Buy | 5,000 | $3.00 | $15K | SEC |
Who owns TUSK? Hedge funds and superinvestors
3 13F filers hold TUSK among their 50 largest positions, worth $42.6M combined. The biggest bets by portfolio weight are Wexford Capital LP (5.4%), Peapod Lane Capital LLC (1.6%) and Johns Hopkins University (0.1%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Wexford Capital LPHedge fund | 5.4% | $39.2M | 12,071,823 | -45.3% shares | Q2 2026 |
| Peapod Lane Capital LLCInstitutional asset manager | 1.6% | $2.2M | 758,985 | -6.0% shares | Q3 2026 |
| Johns Hopkins UniversityEndowment & foundation | 0.1% | $1.3M | 387,359 | New | Q2 2026 |
Each manager counts with its latest 13F (Q3 2026: 1, Q2 2026: 2). Screen TUSK in the grand portfolio →
TUSK stock trades by members of Congress
No member of Congress has disclosed a trade in TUSK.
TUSK questions and answers
Are insiders buying TUSK stock?
Between Aug 1, 2026 and Oct 29, 2026, 1 TUSK insider filed 1 open-market purchase worth $15K on SEC Form 4.
Which hedge funds own TUSK?
3 13F filers hold TUSK among their 50 largest positions, worth $42.6M combined. The biggest bets by portfolio weight are Wexford Capital LP (5.4%), Peapod Lane Capital LLC (1.6%) and Johns Hopkins University (0.1%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
Has Congress traded TUSK?
No member of Congress has disclosed a trade in TUSK.
Who is the largest holder of TUSK?
Among 13F filers, Wexford Capital LP reports the largest TUSK position, $39.2M (12,071,823 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Wexford Capital LP's: 5.4% of its portfolio.
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