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Who

WEXFORD CAPITAL LP

10% owner

Company insider

Files Form 4 as: Director and 10% owner, Nephros; Chief Business Officer, Mammoth Energy Services; Director and 10% owner, Rhino Resource Partners LP; Director and 10% owner, Diamondback Energy; 10% owner, Rlj Entertainment; Other, Arno Therapeutics; Other, Epl Oil & Gas; 10% owner, Empeiria Acquisition.

Every Form 4 they filed

In numbers

Trades disclosed
109
Buys
8
Sells
60
Bought
$14.6M
Sold
$582.7M
Companies
12
Companies where not an officer
11
First trade
29 Mar 2006
Last trade
14 Sep 2026
Last filed
16 Sep 2026

Companies traded

Where they are an officer
TUSK Mammoth Energy ServicesDirector, Officer, 10% owner · Oilfield services · last 17 Jun 20264 buys · 2 sells
Everywhere else they filed: board seats, 10% stakes, other companies
NEPH NephrosDirector, 10% owner · Medical Devices · last 14 Sep 20260 buys · 0 sells
Rhino Resource Partners LPDirector, 10% owner · last 31 Dec 20150 buys · 0 sells
FANG Diamondback EnergyDirector, 10% owner · Oil & Gas E&P · last 9 Dec 20150 buys · 25 sells
Rlj Entertainment10% owner · last 22 Dec 20140 buys · 3 sells
Arno TherapeuticsOther · last 4 Oct 20130 buys · 1 sell
Epl Oil & GasOther · last 31 May 20130 buys · 8 sells
Empeiria Acquisition10% owner · last 20 Dec 20120 buys · 0 sells
Bronco Drilling Company10% owner · last 9 Jul 20093 buys · 20 sells
Icx Technologies10% owner · last 26 Nov 20080 buys · 0 sells
Javelin PharmaceuticalsOther · last 13 May 20081 buy · 0 sells
GPOR Gulfport EnergyOther · Oil & Gas E&P · last 3 May 20060 buys · 1 sell

Activity over time

1 Nov 2024 – 1 Oct 2026
01Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
14 Sep 2026filed 16 Sep 2026NEPH NephrosMedical DevicesSEC FORM 4 Code J—3,355,111 at $0.00filing
14 Sep 2026filed 16 Sep 2026NEPH NephrosMedical DevicesSEC FORM 4 Code J$90K22,710 at $3.95filing
18 Aug 2026filed 20 Aug 2026NEPH NephrosMedical DevicesSEC FORM 4 Code M$2,923812 at $3.60filing
18 Aug 2026filed 20 Aug 2026NEPH Nephrosoption or derivative · Medical DevicesSEC FORM 4 Code M—3,765 at $0.00filing
17 Jun 2026filed 22 Jun 2026TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Code J—1,072,896 at $0.00filing
17 Jun 2026filed 22 Jun 2026TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Code J—6,354,667 at $0.00filing
17 Jun 2026filed 22 Jun 2026TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Bought$10.5M4,019,574 at $2.60filing
17 Jun 2022filed 21 Jun 2022TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Bought$23K10,382 at $2.17filing
16 Jun 2022filed 21 Jun 2022TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Bought$75K35,000 at $2.13filing
1 Jun 2021filed 3 Jun 2021NEPH NephrosMedical DevicesSEC FORM 4 Code X$180K66,667 at $2.70filing
1 Jun 2021filed 3 Jun 2021NEPH Nephrosoption or derivative · Medical DevicesSEC FORM 4 Code X$180K66,667 at $2.70filing
13 Nov 2019filed 15 Nov 2019TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Bought$49K35,904 at $1.36filing
30 Jul 2018filed 1 Aug 2018TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Sold$10.1M266,026 at $38.01filing
29 Jun 2018filed 3 Jul 2018TUSK Mammoth Energy ServicesOilfield servicesSEC FORM 4 Sold$105.1M2,764,400 at $38.01filing
31 Dec 2015filed 5 Jan 2016Rhino Resource Partners LPSEC FORM 4 Code J—2,222,779filing
31 Dec 2015filed 5 Jan 2016Rhino Resource Partners LPSEC FORM 4 Code J—6,793filing
31 Dec 2015filed 5 Jan 2016Rhino Resource Partners LPoption or derivativeSEC FORM 4 Code J—3,179,613 at $0.00filing
31 Dec 2015filed 5 Jan 2016Rhino Resource Partners LPoption or derivativeSEC FORM 4 Code J—9,719 at $0.00filing
9 Dec 2015filed 10 Dec 2015FANG Diamondback EnergyOil & Gas E&PSEC FORM 4 Sold$754K9,822 at $76.74filing
18 Sep 2015filed 22 Sep 2015FANG Diamondback EnergyOil & Gas E&PSEC FORM 4 Sold$4.8M70,000 at $68.58filing

Sectors

Energy32
Not placed36

Buys in green, sells in red, by the company’s sector.

Related people

Mark Lawrence PlaumannDirector · Director at Mammoth Energy Services, filing Form 4 there in the last year
Phillip LancasterDirector · Director at Mammoth Energy Services, filing Form 4 there in the last year
Paul M. JacobiChief Business Officer · Chief Business Officer at Mammoth Energy Services, filing Form 4 there in the last year
Charles E. Davidson10% owner · 10% owner at Mammoth Energy Services, filing Form 4 there in the last year
Arthur H. AmronDirector · Director at Mammoth Energy Services, filing Form 4 there in the last year
Charles Alvin MeloyDirector · Also traded FANG in the last 90 days
Timothy J. CuttDirector · Also traded GPOR in the last 90 days
SGF FANG Holdings, LP10% owner · Also traded FANG in the last 90 days