As of September 29, 2026, GRI Bio's top three insider holders are Walter Marc Hertz (Chief Executive Officer, 321 shares), Albert Agro (Chief Medical Officer, 143 shares), Vipin Chaturvedi (Chief Scientific Officer, 143 shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Walter Marc Hertz | Chief Executive Officer | 321 | 0 | 321 | 52.1% | 24 Apr, 2023 |
| 2 | Albert Agro | Chief Medical Officer | 143 | 0 | 143 | 23.3% | 24 Apr, 2023 |
| 3 | Vipin Chaturvedi | Chief Scientific Officer | 143 | 0 | 143 | 23.3% | 24 Apr, 2023 |
| 4 | Marella Thorell | Director | 8 | 0 | 8 | 1.3% | 14 Dec, 2022 |
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 |
|---|---|---|---|---|---|---|---|---|
| 18 Sep, 2025 | David Charles Baker | Director | Acquired A | 23,605 | $0.00 | $0 | 0 | Direct |
| 18 Sep, 2025 | Camilla V Simpson | Director | Acquired A | 23,605 | $0.00 | $0 | 0 | Direct |
| 18 Sep, 2025 | David Leslie Szekeres | Director | Acquired A | 39,897 | $0.00 | $0 | 0 | Direct |
| 18 Sep, 2025 | Leanne Kelly | Chief Financial Officer | Acquired A | 43,222 | $0.00 | $0 | 0 | Direct |
| 18 Sep, 2025 | Vipin Chaturvedi | Chief Scientific Officer | Acquired A | 43,222 | $0.00 | $0 | 0 | Direct |
| 18 Sep, 2025 | Roelof Rongen | Director | Acquired A | 23,605 | $0.00 | $0 | 0 | Direct |
| 18 Sep, 2025 | Walter Marc Hertz | Chief Executive Officer | Acquired A | 103,067 | $0.00 | $0 | 0 | Direct |
| 26 Aug, 2025 | Walter Marc Hertz | Chief Executive Officer | Acquired A | 26,688 | $0.00 | $0 | 0 | Direct |
| 26 Aug, 2025 | David Charles Baker | Director | Acquired A | 5,994 | $0.00 | $0 | 0 | Direct |
| 26 Aug, 2025 | Leanne Kelly | Chief Financial Officer | Acquired A | 11,854 | $0.00 | $0 | 0 | Direct |
| 26 Aug, 2025 | David Leslie Szekeres | Director | Acquired A | 10,276 | $0.00 | $0 | 0 | Direct |
| 26 Aug, 2025 | Roelof Rongen | Director | Acquired A | 5,994 | $0.00 | $0 | 0 | Direct |
| 26 Aug, 2025 | Camilla V Simpson | Director | Acquired A | 5,994 | $0.00 | $0 | 0 | Direct |
| 26 Aug, 2025 | Vipin Chaturvedi | Chief Scientific Officer | Acquired A | 11,854 | $0.00 | $0 | 0 | Direct |
| 13 Aug, 2025 | Roelof Rongen | Director | Acquired A | 4,527 | $0.00 | $0 | 0 | Direct |
| 13 Aug, 2025 | David Charles Baker | Director | Acquired A | 4,527 | $0.00 | $0 | 0 | Direct |
| 13 Aug, 2025 | David Leslie Szekeres | Director | Acquired A | 7,545 | $0.00 | $0 | 0 | Direct |
| 13 Aug, 2025 | Camilla V Simpson | Director | Acquired A | 4,527 | $0.00 | $0 | 0 | Direct |
| 23 Jan, 2025 | David Leslie Szekeres | Director | Acquired A | 51,937 | $1,273,162.64 | $66.12Bn | 0 | Direct |
| 23 Jan, 2025 | Walter Marc Hertz | Chief Executive Officer | Acquired A | 129,730 | $1,273,162.64 | $165.17Bn | 0 | Direct |