iBio's three largest insider shareholders as of September 29, 2026 are Antonio Bernardino Guimaraes Parada (Director, 183.82K shares), Felipe Duran (Chief Financial Officer, 35.97K shares), Martin Brenner (Chief Scientific Officer, 30.65K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Antonio Bernardino Guimaraes Parada | Director | 0 | 183,823 | 183,823 | 60.3% | 13 Jan, 2025 |
| 2 | Felipe Duran | Chief Financial Officer | 35,974 | 0 | 35,974 | 11.8% | 23 Mar, 2026 |
| 3 | Martin Brenner | Chief Scientific Officer | 30,652 | 0 | 30,652 | 10.1% | 23 Mar, 2026 |
| 4 | Marc Banjak | Chief Legal Officer | 25,000 | 0 | 25,000 | 8.2% | 27 Mar, 2026 |
| 5 | David Arkowitz | Director | 18,382 | 0 | 18,382 | 6.0% | 13 Jan, 2025 |
| 6 | Gary Sender | Director | 9,191 | 0 | 9,191 | 3.0% | 13 Jan, 2025 |
| 7 | William D Clark | Director | 1,838 | 0 | 1,838 | 0.6% | 13 Jan, 2025 |
| 8 | Robert Matthew Lutz | Officer | 20 | 0 | 20 | 0.0% | 15 Nov, 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 |
|---|---|---|---|---|---|---|---|---|
| 31 Jul, 2026 | Molly Carr | Chief Medical Officer | Acquired A | 430,000 | $0.00 | $0 | 430,000 | Direct |
| 18 May, 2026 | Elizabeth Stoner | Director | Acquired A | 60,000 | $0.00 | $0 | 60,000 | Direct |
| 26 Mar, 2026 | Marc Banjak | Chief Legal Officer | Acquired P | 12,500 | $1.64 | $20.53K | 23,566 | Direct |
| 26 Mar, 2026 | Marc Banjak | Chief Legal Officer | Acquired P | 1,434 | $1.76 | $2.52K | 25,000 | Direct |
| 19 Mar, 2026 | Martin Brenner | Director, Officer | Acquired P | 12,336 | $2.02 | $24.92K | 30,652 | Direct |
| 19 Mar, 2026 | Felipe Duran | Chief Financial Officer | Acquired P | 24,835 | $2.02 | $50.13K | 35,974 | Direct |
| 28 Jan, 2026 | Felipe Duran | Chief Financial Officer | Acquired A | 179,000 | $0.00 | $0 | 179,000 | Direct |
| 28 Jan, 2026 | Martin Brenner | Director, Officer | Acquired A | 479,000 | $0.00 | $0 | 479,000 | Direct |
| 28 Jan, 2026 | Marc Banjak | Chief Legal Officer | Acquired A | 146,000 | $0.00 | $0 | 146,000 | Direct |
| 20 Nov, 2025 | Alexandra Kropotova | Director | Acquired A | 13,500 | $0.00 | $0 | 13,500 | Direct |
| 20 Nov, 2025 | Evert B. Schimmelpennink | Director | Acquired A | 13,500 | $0.00 | $0 | 13,500 | Direct |
| 20 Nov, 2025 | Gary Sender | Director | Acquired A | 13,500 | $0.00 | $0 | 13,500 | Direct |
| 20 Nov, 2025 | David Arkowitz | Director | Acquired A | 13,500 | $0.00 | $0 | 13,500 | Direct |
| 20 Nov, 2025 | Antonio Bernardino Guimaraes Parada | Director | Acquired A | 13,500 | $0.00 | $0 | 13,500 | Direct |
| 20 Nov, 2025 | William D Clark | Director | Acquired A | 13,500 | $0.00 | $0 | 13,500 | Direct |
| 20 Oct, 2025 | Martin Brenner | Director, Officer | Acquired A | 180,000 | $0.00 | $0 | 180,000 | Direct |
| 20 Oct, 2025 | Marc Banjak | Chief Legal Officer | Acquired A | 55,000 | $0.00 | $0 | 55,000 | Direct |
| 20 Oct, 2025 | Felipe Duran | Chief Financial Officer | Acquired A | 75,000 | $0.00 | $0 | 75,000 | Direct |
| 21 Feb, 2025 | Felipe Duran | Chief Financial Officer | Acquired A | 84,700 | $0.00 | $0 | 84,700 | Direct |
| 21 Feb, 2025 | Martin Brenner | Director, Officer | Acquired A | 230,700 | $0.00 | $0 | 230,700 | Direct |