Arthur H. Amron

Companies

• MAMMOTH ENERGY SERVICES, INC.Board member Jan 29, 2019 to now¹
• NEPHROS INCBoard member Oct 1, 2007 to now²

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• NNEPHROS INC NEPH140,874 shares³$500.1K at $3.55Aug 12, 2026
• MEMAMMOTH ENERGY SERVICES, INC. TUSK67,135 shares⁴$184.3K at $2.75Jun 12, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Aug 12, 2026Granted 2,418 shares of NEPHROS INC³
• Jun 12, 2026Bought 2,000 shares at $3.28 of MAMMOTH ENERGY SERVICES, INC.⁴
• Jun 11, 2026Bought 2,500 shares at $3.22 of MAMMOTH ENERGY SERVICES, INC.⁴
• May 28, 2026Bought 3,000 shares at $3.25 of MAMMOTH ENERGY SERVICES, INC.⁵
• May 26, 2026Bought 2,500 shares at $3.24 of MAMMOTH ENERGY SERVICES, INC.⁵
• May 11, 2026Granted 3,574 shares of NEPHROS INC⁶
• Mar 16, 2026Granted 3,610 shares of NEPHROS INC⁷
• Dec 11, 2025Bought 10,000 shares at $1.89 of MAMMOTH ENERGY SERVICES, INC.⁸
• Nov 10, 2025Granted 5,391 shares of NEPHROS INC⁹
• Jan 1, 2025Granted 22,418 shares of NEPHROS INC¹⁰
• Dec 12, 2024Bought 1,000 shares at $2.97 of MAMMOTH ENERGY SERVICES, INC.¹¹
• Jun 12, 2024Granted 27,856 shares of MAMMOTH ENERGY SERVICES, INC.¹²
• May 30, 2024Bought 3,000 shares at $2.24 of NEPHROS INC¹³
• May 30, 2024Bought 3,000 shares at $3.65 of MAMMOTH ENERGY SERVICES, INC.¹⁴
• May 28, 2024Bought 2,000 shares at $2.22 of NEPHROS INC¹³
• May 28, 2024Bought 2,000 shares at $3.57 of MAMMOTH ENERGY SERVICES, INC.¹⁴
• Mar 13, 2024Other 91,463 shares of NEPHROS INC¹⁵
• Mar 12, 2024Bought 7,000 shares at $2.45 of NEPHROS INC¹⁵
• Mar 12, 2024Bought 3,000 shares at $3.72 of MAMMOTH ENERGY SERVICES, INC.¹⁶
• Dec 13, 2023Granted 9,291 shares of NEPHROS INC¹⁷
• Jun 7, 2023Granted 23,810 shares of MAMMOTH ENERGY SERVICES, INC.¹⁸
• Jan 5, 2023Granted 27,613 shares of NEPHROS INC¹⁹
• Jun 29, 2022Granted 45,662 shares of MAMMOTH ENERGY SERVICES, INC.²⁰
• Dec 14, 2021Granted 4,582 shares of NEPHROS INC²¹