Insider · CIK 0001048462
Wexford Capital LP
Files at NEPH (NEPHROS INC), TUSK (MAMMOTH ENERGY SERVICES, INC.). First filing Jun 22, 2026, latest Jun 22, 2026.
In brief
Wexford Capital LP files SEC Form 4 as 10% owner, officer and director at TUSK (MAMMOTH ENERGY SERVICES, INC.), and also at NEPH (NEPHROS INC). Since Jun 22, 2026, Wexford Capital LP has reported 1 open-market buy worth $10M and 0 open-market sells worth $0, the latest filed on Jun 22, 2026.
A track record needs three past buys with six months of prices behind them; Wexford Capital LP has 0, so none is measured yet.
The newest scored trade: bought $10M of TUSK on Jun 17, 2026, filed Jun 22, 2026, scored 62 (notable). In the last 12 months: 1 buy worth $10M and 0 sells worth $0.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
TUSK: MAMMOTH ENERGY SERVICES, INC.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 62Notable | MAMMOTH ENERGY SERVICES, INC. | $10M 4,019,574 shares | +61% | +76% from low-21% from high |
Transactions
Every row this insider has filed, 7 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 14, 2026 | NEPH NEPHROS INC | JOther Common Stockindirect: See footnotes | -3,355,111 | $0.00 | $0 | 189,377 | 27 d ago |
| Sep 14, 2026 | NEPH NEPHROS INC | JOther Common Stockindirect: See footnotes | -22,710 | $3.95 | $90k | 166,667 | 27 d ago |
| Aug 18, 2026 | NEPH NEPHROS INC | MOption exercise Common Stock | +812 | $3.60 | $2,923 | 56,872 | Aug 20, 2026 |
| Aug 18, 2026 | NEPH NEPHROS INC | MOption exercise Stock Option (Right to Buy)derivative | -3,765 | $0.00 | $0 | 36,198 | Aug 20, 2026 |
| Jun 17, 2026 | TUSK MAMMOTH ENERGY SERVICES, INC. | JOther Common Stock | +1,072,896 | $0.00 | $0 | 1,451,034 | Jun 22, 2026 |
| Jun 17, 2026 | TUSK MAMMOTH ENERGY SERVICES, INC. | JOther Common Stockindirect: See footnotes | +6,354,667 | $0.00 | $0 | 6,601,215 | Jun 22, 2026 |
| Jun 17, 2026 | TUSK MAMMOTH ENERGY SERVICES, INC. | POpen-market purchase Common Stockindirect: See footnotes | +4,019,574 | $2.60 | $10M | 10,620,789 | Jun 22, 2026 |
Questions about Wexford Capital LP
Answered from the filings on this page, as of the latest one.
Is Wexford Capital LP buying or selling?
In the last 12 months Wexford Capital LP reported 1 open-market buy worth $10M and 0 open-market sells worth $0 on SEC Form 4; the latest was bought $10M of TUSK on Jun 17, 2026. Grants, option exercises and tax withholding are not counted.
How did Wexford Capital LP's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Wexford Capital LP has 0.
Where does Wexford Capital LP file Form 4?
Wexford Capital LP has filed Form 4 at TUSK (MAMMOTH ENERGY SERVICES, INC.) as Chief Business Officer; NEPH (NEPHROS INC). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.