Director Amron Arthur H made one open market purchase of Mammoth Energy Services, Inc. ($TUSK) shares in the last year, totaling $18,900, with the most recent on December 11, 2025. This ranks 3,891st among nearly 5,000 insiders averaging $1.5 million over 3.3 transactions. He reported no open market sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 16, 2026 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Common Stock | 3610 | $0.00 | 134,882.0000 | 11,040,925 | 2.75% | 0.03% |
| Dec. 11, 2025 | MAMMOTH ENERGY SERVICES, INC. | $TUSK | Amron Arthur H | Director | P | Common Stock | 10000 | $1.89 | 57,135.0000 | 48,358,000 | 21.22% | 0.02% |
| Nov. 10, 2025 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Common Stock | 5391 | $0.00 | 131,272.0000 | 11,040,925 | 4.28% | 0.05% |
| Jan. 1, 2025 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Common Stock | 22418 | $0.00 | 125,881.0000 | 10,602,004 | 21.67% | 0.21% |
| Jan. 1, 2025 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Stock Option (Right to Buy) | 7050 | $0.00 | 14,373.0000 | 10,602,004 | 96.27% | 0.07% |
| Dec. 12, 2024 | MAMMOTH ENERGY SERVICES, INC. | $TUSK | Amron Arthur H | Director | P | Common Stock | 1000 | $2.97 | 47,135.0000 | 48,127,000 | 2.17% | 0.00% |
| June 12, 2024 | MAMMOTH ENERGY SERVICES, INC. | $TUSK | Amron Arthur H | Director | A | Common Stock | 27856 | $0.00 | 46,135.0000 | 47,777,000 | 152.39% | 0.06% |
| May 30, 2024 | NEPHROS INC | $NEPH | Amron Arthur H | Director | P | Common Stock | 3000 | $2.24 | 103,463.0000 | 10,386,018 | 2.99% | 0.03% |
| May 28, 2024 | NEPHROS INC | $NEPH | Amron Arthur H | Director | P | Common Stock | 2000 | $2.22 | 100,463.0000 | 10,386,018 | 2.03% | 0.02% |
| May 28, 2024 | MAMMOTH ENERGY SERVICES, INC. | $TUSK | Amron Arthur H | Director | P | Common Stock | 2000 | $3.57 | 15,279.0000 | 47,777,000 | 15.06% | 0.00% |
| May 30, 2024 | MAMMOTH ENERGY SERVICES, INC. | $TUSK | Amron Arthur H | Director | P | Common Stock | 3000 | $3.65 | 18,279.0000 | 47,777,000 | 19.63% | 0.01% |
| May 14, 2024 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Stock Option (Right to Buy) | 7323 | $0.00 | 7,323.0000 | 10,386,018 | 9999.99% | 0.07% |
| March 12, 2024 | NEPHROS INC | $NEPH | Amron Arthur H | Not found | P | Common stock | 7000 | $2.45 | 7,000.0000 | 10,386,018 | 9999.99% | 0.07% |
| March 12, 2024 | MAMMOTH ENERGY SERVICES, INC. | $TUSK | Amron Arthur H | Director | P | Common Stock | 3000 | $3.72 | 23,558.0000 | 47,777,000 | 14.59% | 0.01% |
| March 13, 2024 | NEPHROS INC | $NEPH | Amron Arthur H | Not found | J | Common stock | 91463 | $0.00 | 98,463.0000 | 10,386,018 | 1306.61% | 0.88% |
| Dec. 13, 2023 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Common Stock | 9291 | $0.00 | 9,291.0000 | 0 | 9999.99% | 0.00% |
| June 7, 2023 | MAMMOTH ENERGY SERVICES, INC. | $TUSK | Amron Arthur H | Director | A | Common Stock | 23810 | $0.00 | 23,810.0000 | 47,175,000 | 9999.99% | 0.05% |
| Jan. 5, 2023 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Common Stock | 27613 | $0.00 | 27,613.0000 | 0 | 9999.99% | 0.00% |
| Jan. 5, 2023 | NEPHROS INC | $NEPH | Amron Arthur H | Director | A | Stock Option (Right to Buy) | 7080 | $0.00 | 7,080.0000 | 0 | 9999.99% | 0.00% |