| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MBIO | COMMON STOCK | Purchase | $145,600 | +65,000 | +6.7% | $2.24 | 1,027,987 | 27 Oct 2021 | Direct | F1, F2 |
| Id | Content |
|---|---|
| F1 | Reflects the weighted average purchase price of multiple same-way open market purchase transactions effected by the Reporting Person on the same day at different prices through a purchase order executed by a broker-dealer. The Reporting Person reported on a single line all such transactions that occurred within a one-dollar price range. The range of prices for the purchase transactions on October 27, 2021, was $2.22 to $2.26. The Reporting Person hereby undertakes to provide upon request by the Securities Exchange Commission staff, the Issuer, or a shareholder of the Issuer, full information regarding the number of shares purchased at each separate price. |
| F2 | Includes restricted stock units, which vest over various time periods. |