As of September 29, 2026, the three largest insider holders of ARDX are Scott D Sandell (TenPercentOwner, 10.75Mn shares), Forest Baskett (TenPercentOwner, 10.75Mn shares), David M Mott (Director, 3.35Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Scott D Sandell | TenPercentOwner | 0 | 10,752,012 | 10,752,012 | 33.5% | 27 Dec, 2021 |
| 2 | Forest Baskett | TenPercentOwner | 0 | 10,752,012 | 10,752,012 | 33.5% | 27 Dec, 2021 |
| 3 | David M Mott | Director | 3,349,655 | 0 | 3,349,655 | 10.4% | 18 Jun, 2026 |
| 4 | Michael Raab | President Ceo | 1,619,792 | 0 | 1,619,792 | 5.0% | 25 Aug, 2026 |
| 5 | Susan Rodriguez | Chief Commercial Officer | 449,092 | 0 | 449,092 | 1.4% | 23 May, 2024 |
| 6 | David P. Rosenbaum | Chief Development Officer | 297,005 | 151,373 | 448,378 | 1.4% | 22 Nov, 2024 |
| 7 | Richard J Rodgers | Director | 439,998 | 0 | 439,998 | 1.4% | 18 Jun, 2026 |
| 8 | Eric Duane Foster | Chief Commercial Officer | 409,410 | 0 | 409,410 | 1.3% | 25 Aug, 2026 |
| 9 | Justin A Renz | Chief Financial Officer | 409,052 | 0 | 409,052 | 1.3% | 25 Aug, 2025 |
| 10 | Laura A Williams | Chief Patient Officer | 367,456 | 0 | 367,456 | 1.1% | 25 Aug, 2026 |
| 11 | Mike Kelliher | Chief Business Officer | 349,660 | 0 | 349,660 | 1.1% | 25 Aug, 2026 |
| 12 | William C Jr Bertrand | Director | 329,507 | 0 | 329,507 | 1.0% | 18 Jun, 2026 |
| 13 | John E Bishop | Officer | 317,095 | 0 | 317,095 | 1.0% | 25 Aug, 2026 |
| 14 | Robert Blanks | Officer | 314,421 | 0 | 314,421 | 1.0% | 22 Nov, 2024 |
| 15 | Elizabeth A Grammer | Evp, General Counsel | 299,895 | 0 | 299,895 | 0.9% | 25 Nov, 2025 |
| 16 | James Parker Brady | Chief Human Resources Officer | 245,930 | 0 | 245,930 | 0.8% | 25 Aug, 2026 |
| 17 | Susan Hohenleitner | Chief Financial Officer | 227,520 | 0 | 227,520 | 0.7% | 25 Aug, 2026 |
| 18 | Onaiza Cadoret-Manier | Director | 178,156 | 0 | 178,156 | 0.6% | 18 Jun, 2026 |
| 19 | Muna Bhanji | Director | 163,808 | 0 | 163,808 | 0.5% | 18 Jun, 2026 |
| 20 | Jan M Lundberg | Director | 146,794 | 0 | 146,794 | 0.5% | 16 Jun, 2023 |
| 21 | Joseph James Reilly | Officer | 145,854 | 0 | 145,854 | 0.5% | 25 Aug, 2026 |
| 22 | Jeffrey W Jacobs | Chief Scientific Officer | 119,483 | 0 | 119,483 | 0.4% | 24 Nov, 2021 |
| 23 | Robert Ora Felsch | Officer | 91,560 | 0 | 91,560 | 0.3% | 22 Aug, 2024 |
| 24 | Merdad Parsey | Director | 83,746 | 0 | 83,746 | 0.3% | 18 Jun, 2026 |
| 25 | Robert B Bazemore | Director | 68,006 | 0 | 68,006 | 0.2% | 18 Jun, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 21 Aug, 2026 | Eric Duane Foster | Chief Commercial Officer | Disposed S | 2,598 | $3.86 | $10.02K | 415,374 | Direct |
| 21 Aug, 2026 | Laura A Williams | Chief Patient Officer | Disposed S | 3,486 | $3.86 | $13.45K | 374,709 | Direct |
| 21 Aug, 2026 | Susan Hohenleitner | Chief Financial Officer | Disposed S | 1,558 | $3.86 | $6.01K | 227,520 | Direct |
| 21 Aug, 2026 | James Parker Brady | Chief Human Resources Officer | Disposed S | 1,976 | $3.86 | $7.62K | 259,090 | Direct |
| 21 Aug, 2026 | Mike Kelliher | Chief Business Officer | Disposed S | 3,104 | $3.86 | $11.97K | 354,314 | Direct |
| 21 Aug, 2026 | John E Bishop | Officer | Disposed S | 17,281 | $3.86 | $66.65K | 319,564 | Direct |
| 21 Aug, 2026 | Michael Raab | President Ceo | Disposed S | 15,009 | $3.86 | $57.89K | 1,663,357 | Direct |
| 21 Aug, 2026 | Joseph James Reilly | Officer | Disposed S | 2,872 | $3.86 | $11.08K | 146,964 | Direct |
| 21 Aug, 2026 | Mike Kelliher | Chief Business Officer | Disposed S | 2,652 | $3.86 | $10.23K | 351,662 | Direct |
| 21 Aug, 2026 | Michael Raab | President Ceo | Disposed S | 15,976 | $3.86 | $61.62K | 1,647,381 | Direct |
| 21 Aug, 2026 | Eric Duane Foster | Chief Commercial Officer | Disposed S | 3,389 | $3.86 | $13.07K | 411,985 | Direct |
| 21 Aug, 2026 | John E Bishop | Officer | Disposed S | 2,469 | $3.86 | $9.52K | 317,095 | Direct |
| 21 Aug, 2026 | Joseph James Reilly | Officer | Disposed S | 1,110 | $3.86 | $4.28K | 145,854 | Direct |
| 21 Aug, 2026 | James Parker Brady | Chief Human Resources Officer | Disposed S | 13,160 | $3.86 | $50.76K | 245,930 | Direct |
| 21 Aug, 2026 | Laura A Williams | Chief Patient Officer | Disposed S | 3,089 | $3.86 | $11.91K | 371,620 | Direct |
| 21 Aug, 2026 | Laura A Williams | Chief Patient Officer | Disposed S | 2,430 | $3.86 | $9.37K | 369,190 | Direct |
| 21 Aug, 2026 | Michael Raab | President Ceo | Disposed S | 8,411 | $3.86 | $32.44K | 1,638,970 | Direct |
| 21 Aug, 2026 | Mike Kelliher | Chief Business Officer | Disposed S | 2,002 | $3.86 | $7.72K | 349,660 | Direct |
| 21 Aug, 2026 | Eric Duane Foster | Chief Commercial Officer | Disposed S | 2,575 | $3.86 | $9.93K | 409,410 | Direct |
| 21 Aug, 2026 | Laura A Williams | Chief Patient Officer | Disposed S | 1,734 | $3.86 | $6.69K | 367,456 | Direct |