The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 18, 2026 | Wexford Capital LP | 10% Owner | Option exercise(M) | 4K | — | $0 |
| Aug 18, 2026 | Wexford Capital LP | 10% Owner | Option exercise(M) | 812 | $3.60 | $3K |
| Aug 12, 2026 | Amron Arthur H | Director | Grant(A) | 2K | — | $0 |
| May 11, 2026 | Amron Arthur H | Director | Grant(A) | 4K | — | $0 |
| Mar 23, 2026 | Krandel Judy | Chief Financial Officer | Option exercise(M) | 69K | $1.71 | $118K |
| Mar 23, 2026 | Krandel Judy | Chief Financial Officer | Option exercise(M) | 69K | — | $0 |
| Mar 23, 2026 | Banks Robert R. Jr. | President and CEO | Option exercise(M) | 120K | $1.44 | $173K |
| Mar 23, 2026 | Banks Robert R. Jr. | President and CEO | Option exercise(M) | 120K | — | $0 |
| Mar 16, 2026 | Krandel Judy | Chief Financial Officer | Grant(A) | 4K | — | $0 |
| Mar 16, 2026 | Amron Arthur H | Director | Grant(A) | 4K | — | $0 |
| Nov 10, 2025 | Amron Arthur H | Director | Grant(A) | 5K | — | $0 |
| Nov 10, 2025 | Spandow Oliver J. | Director | Grant(A) | 8K | — | $0 |
| Nov 10, 2025 | Nettis Lisa Marie | Director | Grant(A) | 2K | — | $0 |
| Aug 11, 2025 | Nettis Lisa Marie | Director | Grant(A) | 13K | — | $0 |
| Mar 27, 2025 | Krandel Judy | Chief Financial Officer | Grant(A) | 54K | — | $0 |
| Jan 1, 2025 | Spandow Oliver J. | Director | Grant(A) | 33K | — | $0 |
| Jan 1, 2025 | Spandow Oliver J. | Director | Grant(A) | 7K | — | $0 |
| Jan 1, 2025 | Harris Joseph Michael | Director | Grant(A) | 7K | — | $0 |
| Jan 1, 2025 | Lask Alisa | Director | Grant(A) | 7K | — | $0 |
| Jan 1, 2025 | Amron Arthur H | Director | Grant(A) | 22K | — | $0 |
| Jan 1, 2025 | Amron Arthur H | Director | Grant(A) | 7K | — | $0 |
| May 30, 2024 | Amron Arthur H | Director | Buy(P) | 3K | $2.24 | $7K |
| May 28, 2024 | Amron Arthur H | Director | Buy(P) | 2K | $2.22 | $4K |
| May 16, 2024 | Banks Robert R. Jr. | President and CEO, Director | Buy(P) | 50K | $2.24 | $112K |
| May 14, 2024 | Harris Joseph Michael | Director | Grant(A) | 7K | — | $0 |
| May 14, 2024 | Spandow Oliver J. | Director | Grant(A) | 7K | — | $0 |
| May 14, 2024 | Lask Alisa | Director | Grant(A) | 7K | — | $0 |
| May 14, 2024 | Amron Arthur H | Director | Grant(A) | 7K | — | $0 |
| May 14, 2024 | Banks Robert R. Jr. | President and CEO, Director | Grant(A) | 10K | — | $0 |
| Mar 13, 2024 | Amron Arthur H | Director | Other(J) | 91K | — | $0 |
| Mar 13, 2024 | Wexford GP LLC | 10% Owner | Other(J) | 91K | — | $0 |
| Mar 12, 2024 | Amron Arthur H | Director | Buy(P) | 7K | $2.45 | $17K |
| Dec 13, 2023 | Amron Arthur H | Director | Grant(A) | 9K | — | $0 |
| Dec 13, 2023 | Harris Joseph Michael | Director | Grant(A) | 9K | — | $0 |
| Dec 13, 2023 | Lask Alisa | Director | Grant(A) | 9K | — | $0 |
| Dec 13, 2023 | Spandow Oliver J. | Director | Grant(A) | 14K | — | $0 |
| Dec 7, 2023 | Banks Robert R. Jr. | President and CEO, Director | Buy(P) | 18K | $2.20 | $40K |
| Nov 1, 2023 | Krandel Judy | Chief Financial Officer | Grant(A) | 123K | — | $0 |
| Aug 15, 2023 | Banks Robert R. Jr. | President and CEO, Director | Buy(P) | 2K | $1.69 | $3K |
| Aug 14, 2023 | Banks Robert R. Jr. | President and CEO, Director | Buy(P) | 99 | $1.50 | $149 |
| Jan 5, 2023 | Harris Joseph Michael | Director | Grant(A) | 8K | — | $0 |
| Jan 5, 2023 | Harris Joseph Michael | Director | Grant(A) | 7K | — | $0 |
| Jan 5, 2023 | Amron Arthur H | Director | Grant(A) | 28K | — | $0 |
| Jan 5, 2023 | Amron Arthur H | Director | Grant(A) | 7K | — | $0 |
| Jan 5, 2023 | Gwydir Tom | Director | Grant(A) | 28K | — | $0 |
| Jan 5, 2023 | Gwydir Tom | Director | Grant(A) | 7K | — | $0 |
| Jan 5, 2023 | Spandow Oliver J. | Director | Grant(A) | 42K | — | $0 |
| Jan 5, 2023 | Spandow Oliver J. | Director | Grant(A) | 7K | — | $0 |
| Jan 5, 2023 | Lask Alisa | Director | Grant(A) | 28K | — | $0 |
| Jan 5, 2023 | Lask Alisa | Director | Grant(A) | 7K | — | $0 |
| Sep 6, 2022 | Harris Joseph Michael | Director | Grant(A) | 13K | — | $0 |
| Mar 5, 2022 | Astor Andrew | President, CEO & CFO, Director | Option exercise(M) | 15K | $2.70 | $40K |
| Mar 5, 2022 | Astor Andrew | President, CEO & CFO, Director | Option exercise(M) | 15K | — | $0 |
| Feb 16, 2022 | Lobo Wesley S. | Chief Marketing Officer | Tax withholding(F) | 6K | $4.80 | $31K |
| Dec 14, 2021 | Gwydir Tom | Director | Grant(A) | 7K | — | $0 |
| Dec 14, 2021 | Astor Andrew | President & CEO, Director | Grant(A) | 39K | — | $0 |
| Dec 14, 2021 | Spandow Oliver J. | Director | Grant(A) | 5K | — | $0 |
| Dec 14, 2021 | Spandow Oliver J. | Director | Grant(A) | 7K | — | $0 |
| Dec 14, 2021 | Gwydir Tom | Director | Grant(A) | 5K | — | $0 |
| Sep 1, 2021 | Lobo Wesley S. | Chief Commercial Officer | Grant(A) | 57K | — | $0 |
| Aug 20, 2021 | Lobo Wesley S. | Chief Marketing Officer | Buy(P) | 1K | $7.92 | $8K |
| Aug 18, 2021 | Astor Andrew | President & CEO, Director | Buy(P) | 3K | $7.77 | $19K |
| Aug 18, 2021 | Gwydir Tom | Director | Buy(P) | 5K | $7.64 | $38K |
| Aug 17, 2021 | Astor Andrew | President & CEO, Director | Buy(P) | 3K | $7.67 | $19K |
| Jun 1, 2021 | Wexford Capital LP | Director, 10% Owner | Option exercise(X) | 67K | $2.70 | $180K |
| Jun 1, 2021 | Wexford Capital LP | Director, 10% Owner | Option exercise(X) | 67K | $2.70 | $180K |
| May 27, 2021 | Evans Daron | CEO Specialty Renal Products | Tax withholding(F) | 349 | $2.70 | $942 |
| May 27, 2021 | Evans Daron | CEO Specialty Renal Products | Tax withholding(F) | 349 | $2.70 | $942 |
| Feb 16, 2021 | Lobo Wesley S. | Chief Marketing Officer | Grant(A) | 41K | — | $0 |
| Feb 16, 2021 | Lobo Wesley S. | Chief Marketing Officer | Grant(A) | 114K | — | $0 |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 4K | $4.59 | $16K |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 4K | $4.50 | $20K |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 4K | $3.60 | $14K |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 3K | $4.14 | $12K |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 4K | — | $0 |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 3K | — | $0 |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 4K | — | $0 |
| Jan 27, 2021 | Wexford GP LLC | Director, 10% Owner | Option exercise(M) | 4K | — | $0 |
| Jan 6, 2021 | Amron Arthur H | Director | Grant(A) | 4K | — | $0 |
| Jan 6, 2021 | Amron Arthur H | Director | Grant(A) | 7K | — | $0 |
| Jan 6, 2021 | Spandow Oliver J. | Director | Grant(A) | 4K | — | $0 |
| Jan 6, 2021 | Spandow Oliver J. | Director | Grant(A) | 7K | — | $0 |
| Jan 6, 2021 | Persen Malcolm C | Director | Grant(A) | 6K | — | $0 |
| Jan 6, 2021 | Persen Malcolm C | Director | Grant(A) | 7K | — | $0 |
| Jan 6, 2021 | Lask Alisa | Director | Grant(A) | 4K | — | $0 |
| Jan 6, 2021 | Lask Alisa | Director | Grant(A) | 7K | — | $0 |
| Jan 6, 2021 | Gwydir Tom | Director | Grant(A) | 4K | — | $0 |
| Jan 6, 2021 | Gwydir Tom | Director | Grant(A) | 7K | — | $0 |
| Jan 6, 2021 | Davidson Charles E | Director, 10% Owner | Grant(A) | 3K | — | $0 |
| Nov 19, 2020 | Astor Andrew | President & CEO, Director | Buy(P) | 1K | $5.87 | $6K |
| Nov 18, 2020 | Spandow Oliver J. | Director | Buy(P) | 2K | $5.83 | $9K |
| Oct 15, 2020 | Davidson Charles E | Director, 10% Owner | Grant(A) | 167K | $6.00 | $1.0M |
| Aug 24, 2020 | Astor Andrew | President/CEO/CFO, Director | Grant(A) | 152K | — | $0 |
| Aug 19, 2020 | Astor Andrew | COO/CFO, Director | Buy(P) | 950 | $7.40 | $7K |
| May 28, 2020 | Astor Andrew | CFO/COO | Buy(P) | 1K | $6.96 | $7K |
| May 11, 2020 | Persen Malcolm C | Director | Option exercise(X) | 2K | $7.65 | $13K |
| May 11, 2020 | Persen Malcolm C | Director | Option exercise(X) | 2K | — | $0 |
| Mar 12, 2020 | Astor Andrew | CFO/COO | Buy(P) | 1K | $6.70 | $7K |
| Mar 12, 2020 | Evans Daron | President and CEO, Director | Buy(P) | 3K | $6.65 | $17K |
| Mar 5, 2020 | Astor Andrew | CFO/COO | Buy(P) | 700 | $8.46 | $6K |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Coverage: Form 4 filings indexed 2006-01-02 → 2026-09-03. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).
Connected pages for NEPH