As of April 17, 2026, the three largest insider holders of ARDX are Michael Raab (President Ceo, 1.82Mn shares), David P. Rosenbaum (Chief Development Officer, 448.38K shares), Laura A Williams (Chief Patient Officer, 436.08K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Michael Raab | President Ceo | 1,816,448 | 0 | 18 Mar, 2026 |
| David P. Rosenbaum | Chief Development Officer | 297,005 | 151,373 | 22 Nov, 2024 |
| Laura A Williams | Chief Patient Officer | 436,082 | 0 | 23 Feb, 2026 |
| Eric Duane Foster | Chief Commercial Officer | 425,970 | 0 | 23 Feb, 2026 |
| Richard J Rodgers | - | 413,543 | 0 | 23 Jun, 2025 |
| Justin A Renz | Chief Financial Officer | 409,052 | 0 | 25 Aug, 2025 |
| Mike Kelliher | Chief Business Officer | 364,666 | 0 | 23 Feb, 2026 |
| Robert Blanks | - | 314,421 | 0 | 22 Nov, 2024 |
| Elizabeth A Grammer | Evp, General Counsel | 299,895 | 0 | 25 Nov, 2025 |
| James Parker Brady | Chief Human Resources Officer | 262,912 | 0 | 23 Feb, 2026 |
| Susan Hohenleitner | Chief Financial Officer | 230,533 | 0 | 23 Feb, 2026 |
| Joseph James Reilly | - | 151,790 | 0 | 23 Feb, 2026 |
| Jan M Lundberg | - | 146,794 | 0 | 16 Jun, 2023 |
| Jeffrey W Jacobs | Chief Scientific Officer | 119,483 | 0 | 24 Nov, 2021 |
| Robert Ora Felsch | - | 91,560 | 0 | 22 Aug, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 16 Mar, 2026 | Michael Raab | Common Stock | A | 20,833 | $0.99 | 1,856,986 | D | M |
| 16 Mar, 2026 | Michael Raab | Common Stock | D | 41,666 | $5.84 | 1,816,448 | D | S |
| 16 Mar, 2026 | Michael Raab | Stock Option (Right to Buy) | D | 20,833 | $0.00 | 374,168 | D | M |
| 24 Feb, 2026 | Michael Raab | Common Stock | A | 20,833 | $0.99 | 1,877,819 | D | M |
| 24 Feb, 2026 | Michael Raab | Common Stock | D | 41,666 | $6.26 | 1,836,153 | D | S |
| 24 Feb, 2026 | Michael Raab | Stock Option (Right to Buy) | D | 20,833 | $0.00 | 395,001 | D | M |
| 20 Feb, 2026 | Laura A Williams | Common Stock | D | 7,192 | $5.87 | 437,066 | D | S |
| 20 Feb, 2026 | Joseph James Reilly | Common Stock | D | 4,387 | $5.87 | 152,394 | D | S |
| 20 Feb, 2026 | Eric Duane Foster | Common Stock | D | 9,176 | $5.87 | 427,233 | D | S |
| 20 Feb, 2026 | Michael Raab | Common Stock | D | 40,401 | $5.87 | 1,862,567 | D | S |
| 20 Feb, 2026 | Mike Kelliher | Common Stock | D | 8,434 | $5.87 | 365,827 | D | S |
| 20 Feb, 2026 | David M Mott | Common Stock | A | 333,333 | $5.84 | 3,302,918 | D | P |
| 20 Feb, 2026 | Susan Hohenleitner | Common Stock | D | 1,786 | $5.87 | 230,780 | D | S |
| 20 Feb, 2026 | James Parker Brady | Common Stock | D | 2,234 | $5.87 | 263,221 | D | S |
| 20 Feb, 2026 | Laura A Williams | Common Stock | D | 984 | $5.71 | 436,082 | D | S |
| 20 Feb, 2026 | Eric Duane Foster | Common Stock | D | 1,261 | $5.71 | 425,972 | D | S |
| 20 Feb, 2026 | Mike Kelliher | Common Stock | D | 1,159 | $5.71 | 364,668 | D | S |
| 20 Feb, 2026 | Joseph James Reilly | Common Stock | D | 602 | $5.71 | 151,792 | D | S |
| 20 Feb, 2026 | Michael Raab | Common Stock | D | 5,576 | $5.71 | 1,856,991 | D | S |
| 20 Feb, 2026 | Susan Hohenleitner | Common Stock | D | 247 | $5.71 | 230,533 | D | S |