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Arthur H Amron
Insider
First SEC filing: June 12, 2026 · Latest: June 12, 2026
Insider at
Insider transactions
5 buys (P)
0 sells (S)
Net: $51,360
Avg return of open purchases vs now: 0.0%
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 12, 2026 | NEPH | A | 2,418 | · | · | 140,874 Direct | +1.75% | Acquired | (price as of 2026-10-05) |
| June 12, 2026 | TUSK | P | 2,000 | $3.28 | $6,560 | 67,135 Direct | +3.07% | Acquired | -13.4% (price as of 2026-10-05) |
| June 11, 2026 | TUSK | P | 2,500 | $3.22 | $8,050 | 65,135 Direct | +3.99% | Acquired | -11.8% (price as of 2026-10-05) |
| May 28, 2026 | TUSK | P | 3,000 | $3.25 | $9,750 | 62,635 Direct | +5.03% | Acquired | -12.6% (price as of 2026-10-05) |
| May 26, 2026 | TUSK | P | 2,500 | $3.24 | $8,100 | 59,635 Direct | +4.38% | Acquired | -12.3% (price as of 2026-10-05) |
| May 11, 2026 | NEPH | A | 3,574 | · | · | 138,456 Direct | +2.65% | Acquired | (price as of 2026-10-05) |
| March 16, 2026 | NEPH | A | 3,610 | · | · | 134,882 Direct | +2.75% | Acquired | (price as of 2026-10-05) |
| Dec. 11, 2025 | TUSK | P | 10,000 | $1.89 | $18,900 | 57,135 Direct | +21.22% | Acquired | 50.3% (price as of 2026-10-05) |
| Nov. 10, 2025 | NEPH | A | 5,391 | · | · | 131,272 Direct | +4.28% | Acquired | (price as of 2026-10-05) |
| Jan. 1, 2025 | NEPH | A | 7,050 | · | · | 7,050 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 1, 2025 | NEPH | A | 22,418 | · | · | 125,881 Direct | +21.67% | Acquired | (price as of 2026-10-05) |
| Dec. 12, 2024 | TUSK | P | 1,000 | $2.97 | $2,970 | 47,135 Direct | +2.17% | Acquired | -4.4% (price as of 2026-10-05) |
| June 12, 2024 | TUSK | A | 27,856 | · | · | 46,135 Direct | +152.39% | Acquired | (price as of 2026-10-05) |
| May 30, 2024 | TUSK | P | 3,000 | $3.65 | $10,950 | 18,279 Direct | +19.63% | Acquired | -22.2% (price as of 2026-10-05) |
| May 30, 2024 | NEPH | P | 3,000 | $2.24 | $6,720 | 103,463 Direct | +2.99% | Acquired | 58.5% (price as of 2026-10-05) |
| May 28, 2024 | TUSK | P | 2,000 | $3.57 | $7,140 | 15,279 Direct | +15.06% | Acquired | -20.4% (price as of 2026-10-05) |
| May 28, 2024 | NEPH | P | 2,000 | $2.22 | $4,440 | 100,463 Direct | +2.03% | Acquired | 59.9% (price as of 2026-10-05) |
| May 14, 2024 | NEPH | A | 7,323 | · | · | 7,323 Direct | · | Acquired | (price as of 2026-10-05) |
| March 13, 2024 | NEPH | J | 91,463 | · | · | 98,463 Direct | +1306.61% | Acquired | (price as of 2026-10-05) |
| March 12, 2024 | TUSK | P | 3,000 | $3.72 | $11,160 | 13,279 Direct | +29.19% | Acquired | -23.7% (price as of 2026-10-05) |
| March 12, 2024 | NEPH | P | 7,000 | $2.45 | $17,150 | 7,000 Direct | · | Acquired | 44.9% (price as of 2026-10-05) |
| Dec. 13, 2023 | NEPH | A | 9,291 | · | · | 9,291 Direct | · | Acquired | (price as of 2026-10-05) |
| June 7, 2023 | TUSK | A | 23,810 | · | · | 23,810 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 5, 2023 | NEPH | A | 27,613 | · | · | 27,613 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 5, 2023 | NEPH | A | 7,080 | · | · | 7,080 Direct | · | Acquired | (price as of 2026-10-05) |
| June 29, 2022 | TUSK | A | 45,662 | · | · | 45,662 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 14, 2021 | NEPH | A | 4,582 | · | · | 4,582 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 14, 2021 | NEPH | A | 7,062 | · | · | 7,062 Direct | · | Acquired | (price as of 2026-10-05) |
| June 2, 2021 | TUSK | A | 25,641 | · | · | 25,641 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 6, 2021 | NEPH | A | 3,666 | · | · | 3,666 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 6, 2021 | NEPH | A | 6,850 | · | · | 6,850 Direct | · | Acquired | (price as of 2026-10-05) |
| July 2, 2020 | TUSK | A | 86,957 | · | · | 86,957 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 16, 2019 | NEPH | A | 3,448 | · | · | 3,448 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 16, 2019 | NEPH | A | 5,568 | · | · | 5,568 Direct | · | Acquired | (price as of 2026-10-05) |
| June 5, 2019 | TUSK | A | 10,493 | · | · | 10,493 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 25, 2019 | TUSK | A | 1,549 | · | · | 1,549 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 19, 2018 | NEPH | A | 46,457 | · | · | 46,457 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 14, 2018 | NEPH | A | 47,673 | · | · | 47,673 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 20, 2017 | NEPH | A | 40,284 | · | · | 40,284 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 20, 2017 | NEPH | A | 73,864 | · | · | 73,864 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 24, 2016 | NEPH | A | 33,880 | · | · | 33,880 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 24, 2016 | NEPH | A | 73,864 | · | · | 73,864 Direct | · | Acquired | (price as of 2026-10-05) |
| Sept. 9, 2015 | NEPH | A | 58,240 | · | · | 58,240 Direct | · | Acquired | (price as of 2026-10-05) |
| Nov. 6, 2014 | NEPH | A | 25,395 | · | · | 25,395 Direct | · | Acquired | (price as of 2026-10-05) |
| March 26, 2014 | NEPH | A | 26,598 | · | · | 26,598 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 31, 2013 | NEPH | A | 19,733 | · | · | 19,733 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 20, 2013 | NEPH | A | 5,417 | · | · | 28,763 Direct | +23.20% | Acquired | (price as of 2026-10-05) |
| May 23, 2013 | NEPH | A | 23,346 | · | · | 23,346 Direct | · | Acquired | (price as of 2026-10-05) |
| May 23, 2013 | NEPH | A | 10,000 | · | · | 10,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Feb. 16, 2012 | NEPH | A | 10,000 | · | · | 10,000 Direct | · | Acquired | (price as of 2026-10-05) |
| March 24, 2011 | NEPH | A | 32,000 | · | · | 32,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Jan. 8, 2010 | NEPH | A | 20,000 | · | · | 20,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Nov. 30, 2007 | NEPH | A | 15,000 | · | · | 15,000 Direct | · | Acquired | (price as of 2026-10-05) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Jan. 1, 2025 | NEPH | Stock Option (Right to Buy) | Common Stock | $1.47 | Jan. 1, 2035 | 7,050 | Acquired |
| May 14, 2024 | NEPH | Stock Option (Right to Buy) | Common Stock | $2.14 | May 14, 2034 | 7,323 | Acquired |
| Jan. 5, 2023 | NEPH | Stock Option (Right to Buy) | Common Stock | $1.07 | Jan. 5, 2033 | 7,080 | Acquired |
| Dec. 14, 2021 | NEPH | Stock Option (Right to Buy) | Common Stock | $6.82 | Dec. 14, 2031 | 7,062 | Acquired |
| Jan. 6, 2021 | NEPH | Stock Option (Right to Buy) | Common Stock | $8.06 | Jan. 6, 2031 | 6,850 | Acquired |
| Dec. 16, 2019 | NEPH | Stock Option (Right to Buy) | Common Stock | $8.57 | Dec. 16, 2029 | 5,568 | Acquired |
| Dec. 19, 2018 | NEPH | Stock Option (Right to Buy) | Common Stock | $0.65 | Dec. 19, 2028 | 46,457 | Acquired |
| Dec. 20, 2017 | NEPH | Non-Qualified Stock Option | Common Stock | $0.50 | Dec. 27, 2027 | 40,284 | Acquired |
| Aug. 24, 2016 | NEPH | Non-Qualified Stock Option | Common Stock | $0.40 | Aug. 24, 2026 | 33,880 | Acquired |
| March 26, 2014 | NEPH | Non Qualiffied Stock Option (right to buy) | Common Stock | $0.46 | March 26, 2024 | 26,598 | Acquired |
| May 23, 2013 | NEPH | Non-Qualified Stock Option (right to buy) | Common Stock | $0.71 | May 23, 2023 | 10,000 | Acquired |
| Feb. 16, 2012 | NEPH | Non-qualified stock option (right to buy) | Common Stock | $0.83 | Feb. 16, 2022 | 10,000 | Acquired |
| March 24, 2011 | NEPH | Non-qualified stock option (right to buy) | Common Stock | $0.51 | March 24, 2021 | 32,000 | Acquired |
| Jan. 8, 2010 | NEPH | Non-qualified stock option (right to buy) | Common Stock | $0.95 | Jan. 8, 2020 | 20,000 | Acquired |
| Nov. 30, 2007 | NEPH | Non-qualified stock option (right to buy) | Common Stock | $0.80 | Nov. 30, 2017 | 15,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).