Insider · CIK 0001179697

Arthur H Amron

Files at: NEPH, TUSK, RHNO. On EDGAR ↗

Period1M 3M 6M 1Y 2Y All datashares as filed — not split-adjusted

Open-market buys & salesbuys $15k · 1sales $0 · 0net $15k

Reported trades — common stock

Trade	Reported (ET)	Company	Shares	Avg price	Total	Owned after	Δ stake	Flags
Sep 14, 2026 JForm 4 →	Sep 16, 4:59 pm EDT	NEPHROS INCNEPH	43,295	$3.95	$89,705	25,546	—
Aug 12, 2026 AForm 4 →	Aug 14, 4:05 pm EDT	NEPHROS INCNEPH	2,418	—	—	140,874	—
Jun 17, 2026 JForm 4 →	Jun 22, 4:32 pm EDT	MAMMOTH ENERGY SERVICES, INC.TUSK	29,450	—	—	10,329	—
Jun 11, 2026 PForm 4 →	Jun 15, 4:28 pm EDT	MAMMOTH ENERGY SERVICES, INC.TUSK	4,500	$3.25	$14,610	67,135	+7.18%
May 11, 2026 AForm 4 →	Jun 12, 5:57 pm EDT	NEPHROS INCNEPH	3,574	—	—	138,456	—	late
Jan 25, 2019 AForm 4 →	Jan 29, 5:41 pm EST	MAMMOTH ENERGY SERVICES, INC.TUSK	1,549	—	—	1,549	—	plan?
Dec 14, 2018 AForm 4 →	Dec 18, 5:23 pm EST	NEPHROS INCNEPH	47,673	—	—	47,673	—	plan?
Dec 20, 2017 AForm 4 →	Dec 22, 11:37 am EST	NEPHROS INCNEPH	73,864	—	—	73,864	—	plan?
Aug 24, 2016 AForm 4 →	Aug 25, 4:57 pm EDT	NEPHROS INCNEPH	73,864	—	—	73,864	—	plan?
Dec 31, 2015 JForm 4 →	Jan 5, 2016, 5:49 pm EST	Rhino Resource Partners LPRNO	12,916	—	—	25,115	—	plan?
Sep 9, 2015 AForm 4 →	Sep 11, 4:29 pm EDT	NEPHROS INCNEPH	58,240	—	—	58,240	—	plan?

Reported trades — derivatives (options, RSUs, warrants)

Trade	Reported (ET)	Company	Shares	Avg price	Total	Owned after	Δ stake	Flags
Dec 19, 2018 AForm 4 →	Dec 21, 4:55 pm EST	NEPHROS INCNEPH	46,457	—	—	46,457	—
Dec 20, 2017 AForm 4 →	Dec 22, 11:37 am EST	NEPHROS INCNEPH	40,284	—	—	40,284	—
Aug 24, 2016 AForm 4 →	Aug 25, 4:57 pm EDT	NEPHROS INCNEPH	33,880	—	—	33,880	—
Dec 31, 2015 JForm 4 →	Jan 5, 2016, 5:49 pm EST	Rhino Resource Partners LPRNO	18,476	—	—	35,923	—