MBIO's three largest insider shareholders as of August 04, 2026 are Biotech, Inc. Fortress (TenPercentOwner, 536.58K shares), Lindsay A Md Rosenwald (Director, 218.42K shares), Brian Achenbach (Svp, Fin. Corp. Controller, 144.73K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Lindsay A Md Rosenwald | - | 218,423 | 0 | 24 Sep, 2021 |
| Michael J Zelefsky | - | 104,197 | 0 | 08 Jul, 2021 |
| Neil Herskowitz | - | 115,197 | 0 | 08 Jul, 2021 |
| Biotech, Inc. Fortress | - | 536,577 | 0 | 05 Jan, 2026 |
| Adam J. Chill | - | 107,197 | 0 | 08 Jul, 2021 |
| Manuel Md Litchman | President And Ceo | 111,079 | 0 | 07 Jul, 2023 |
| Brian Achenbach | Svp, Fin. Corp. Controller | 144,729 | 0 | 16 Dec, 2021 |
| David Jin | - | 286 | 0 | 30 Dec, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 02 Jan, 2026 | Biotech, Inc. Fortress | COMMON STOCK, PAR VALUE $0.0001 | A | 278,385 | $0.00 | 536,577 | D | A |
| 30 Dec, 2025 | Neil Herskowitz | COMMON STOCK, PAR VALUE $0.0001 | D | 247 | $0.96 | 145 | D | S |
| 30 Dec, 2025 | Adam J. Chill | COMMON STOCK, PAR VALUE $0.0001 | D | 4 | $0.95 | 375 | D | S |
| 30 Dec, 2025 | David Jin | COMMON STOCK, PAR VALUE $0.0001 | A | 247 | $0.96 | 286 | D | P |
| 29 Sep, 2025 | Biotech, Inc. Fortress | COMMON STOCK, PAR VALUE $0.0001 | A | 59,334 | $0.00 | 258,192 | D | A |
| 24 Apr, 2025 | Manuel Md Litchman | COMMON STOCK | D | 27 | $1.24 | 1,634 | D | F |
| 31 Mar, 2025 | Biotech, Inc. Fortress | COMMON STOCK, PAR VALUE $0.0001 | A | 67,806 | $0.00 | 198,858 | D | A |
| 27 Jun, 2024 | Biotech, Inc. Fortress | COMMON STOCK, PAR VALUE $0.0001 | A | 575,191 | $0.00 | 2,502,991 | D | A |
| 31 May, 2024 | Manuel Md Litchman | Common Stock | D | 1,396 | $0.35 | 83,024 | D | F |
| 02 Jan, 2024 | Biotech, Inc. Fortress | COMMON STOCK, PAR VALUE $0.0001 | A | 419,092 | $0.00 | 1,927,800 | D | A |
| 05 Jul, 2023 | Neil Herskowitz | COMMON STOCK, PAR VALUE $0.0001 | A | 7,246 | $0.00 | 19,703 | D | A |
| 05 Jul, 2023 | Lindsay A Md Rosenwald | COMMON STOCK, PAR VALUE $0.0001 | A | 7,246 | $0.00 | 60,525 | D | A |
| 05 Jul, 2023 | Michael J Zelefsky | COMMON STOCK, PAR VALUE $0.0001 | A | 7,246 | $0.00 | 18,970 | D | A |
| 05 Jul, 2023 | Michael J Zelefsky | COMMON STOCK, PAR VALUE $0.0001 | A | 7,246 | $0.00 | 18,970 | D | A |
| 24 Apr, 2023 | Manuel Md Litchman | COMMON STOCK, PAR VALUE $0.0001 | A | 5,000 | $0.00 | 111,079 | D | A |
| 05 Jul, 2023 | Adam J. Chill | COMMON STOCK, PAR VALUE $0.0001 | A | 7,246 | $0.00 | 19,170 | D | A |
| 05 Jul, 2023 | Michael J Zelefsky | COMMON STOCK, PAR VALUE $0.0001 | A | 7,246 | $0.00 | 18,970 | D | A |
| 06 Jan, 2023 | Biotech, Inc. Fortress | COMMON STOCK, PAR VALUE $0.0001 | A | 2,807,008 | $0.00 | 22,630,620 | D | A |
| 08 Dec, 2021 | Brian Achenbach | COMMON STOCK | A | 22,500 | $0.00 | 149,103 | D | A |
| 14 Dec, 2021 | Brian Achenbach | COMMON STOCK | D | 4,374 | $1.83 | 144,729 | D | S |