Company: MBIO
Filing Date: 2025-02-07
Form Type: 424B4
Source: 0001410578-25-000085
Chunk: 255

Company: MUSTANG BIO, INC.
Filing Date: 2025-02-07
Form: 424B4
Chunk 255
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 June 2021, the Company’s stockholders approved an amendment to the Incentive Plan to increase the number of authorized shares issuable by 4,000 shares, for a total of 10,666 shares. In June 2022, the Company’s stockholders approved an amendment to the Incentive Plan to increase the number of authorized shares issuable by 4,000 shares, for a total of 14,666 shares As of December 31, 2023,5,650 shares are available for issuance of stock-based awards under the Incentive Plan. Stock Options The following table summarizes stock option activities for the years ended December 31, 2023 and 2022:

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 Stock Options | ​ 
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 Weighted Average 
 Exercise Price   |        ​ 
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     Weighted Average 
            Remaining 
 Contractual Life (in 
               years) |
|:----------------------------------------------------|:--|--------------:|:--|:-----------------|---------:|:--|---------------------:|
| Outstanding at December 31, 2021                    |   |         1,521 | ​ | $                | 4,297.50 |   |                 5.31 |
| Outstanding at December 31, 2022                    |   |         1,521 | ​ | $                | 4,297.50 |   |                 4.31 |
| Outstanding at December 31, 2023                    |   |         1,521 | ​ | $                | 4,297.50 |   |                 3.31 |
| Options vested and exercisable at December 31, 2023 |   |           951 | ​ | $                | 4,297.50 |   |                 3.31 |

F-25

As of December 31, 2023, the Company had no unrecognized stock-based compensation expense related to options. The Company accounts for forfeited awards as they occur as permitted. Restricted Stock Awards Certain employees and directors have been awarded restricted stock. The restricted stock vesting consists of milestone and time-based vesting. The following table summarizes restricted stock award activities for the years ended December