WEXFORD CAPITAL LP
SEC insider (Form 3/4/5 filer). CIK 0001048462. 10% Owner at NEPHROS INC (NEPH) and 1 other issuer. 6 reported Form 4/5 transactions since Sep 2024; latest on Sep 14, 2026. Located in WEST PALM BEACH, FL.
Companies WEXFORD CAPITAL LP has filed insider reports for
- NEPHROS INC (NEPH): 10% Owner
- MAMMOTH ENERGY SERVICES, INC. (TUSK): Director, Officer, 10% Owner, Chief Business Officer
WEXFORD CAPITAL LP
CIK: 0001048462
Transaction Breakdown
Open Market Buys (P)1 (16.7%)
High conviction signal
Open Market Sales (S)0 (0.0%)
Position reduction
Option Exercises (M)1 (16.7%)
Derivative conversions
Awards (A)0 (0.0%)
Compensation grants
Other (G, F, J, C, D, …)4 (66.7%)
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (6 total)
- Sep 14, 2026NEPH
NEPHROS INC
OtherIndirect3.4M shares- - Sep 14, 2026NEPH
NEPHROS INC
OtherIndirect22.7K shares at avg. $3.95$90K - Aug 18, 2026NEPH
NEPHROS INC
ExerciseDirect812 shares at avg. $3.60$3K - Jun 17, 2026TUSK
MAMMOTH ENERGY SERVICES, INC.
OtherDirect1.1M shares- - Jun 17, 2026TUSK
MAMMOTH ENERGY SERVICES, INC.
OtherIndirect6.4M shares- - Jun 17, 2026TUSK
MAMMOTH ENERGY SERVICES, INC.
PurchaseIndirect4M shares at avg. $2.60$10.5M
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 14, 2026 |  NEPH NEPHROS INC | Other | 3,355,111 | - | $0 | Indirect |
| Sep 14, 2026 | NEPH NEPHROS INC | Other | 22,710 | $3.95 | $89,705 | Indirect |
| Aug 18, 2026 | NEPH NEPHROS INC | Exercise | 812 | $3.60 | $2,923 | Direct |
| Jun 17, 2026 |  TUSK MAMMOTH ENERGY SERVICES, INC. | Other | 1,072,896 | - | $0 | Direct |
| Jun 17, 2026 | TUSK MAMMOTH ENERGY SERVICES, INC. | Other | 6,354,667 | - | $0 | Indirect |
| Jun 17, 2026 | TUSK MAMMOTH ENERGY SERVICES, INC. | Purchase | 4,019,574 | $2.60 | $10,468,177 | Indirect |
1-6 of 6 transactions