Company: MBIO
Filing Date: 2025-02-07
Form Type: 424B4
Source: 0001410578-25-000085
Chunk: 272

Company: MUSTANG BIO, INC.
Filing Date: 2025-02-07
Form: 424B4
Chunk 272
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 April 11, 2023, the Company’s long-term debt facility (the “Term Loan”) with Runway Growth Finance Corp. (“Runway”), originally entered into on March 4, 2023, was terminated upon receipt by Runway of a payoff amount of $30.4 million from the Company comprised of principal, interest and the applicable final payment amount. The loss on extinguishment was recorded in interest expense

F-40

in the Unaudited Statements of Operations. For the nine months ended September 30, 2024, and 2023, the Company recorded the following components in interest expense:

| ​                             
 ​                             
 ($ in thousands)              | ​ 
 ​ | ​                                       
 For the nine months ended September 30, 
 2024                                    | ​ | ​ | ​    
 2023 |     ​ |
|:------------------------------|:--|:----------------------------------------|--:|:--|:-----|------:|
| Interest expense              | ​ | $                                       | — | ​ | $    | 1,187 |
| Amortization of Debt Discount | ​ | ​                                       | — | ​ | ​    |   118 |
| Loss on Extinguishment        | ​ | ​                                       | — | ​ | ​    | 2,796 |
| Other                         | ​ | ​                                       | 4 | ​ | ​    |    11 |
| Total Interest Expense        | ​ | $                                       | 4 | ​ | $    | 4,112 |

Note 9 - Stockholders’ Equity Registration Statements On April 23, 2021, the Company filed a shelf registration statement on Form S-3 (File No. 333-255476) (the “2021 S-3”), which was declared effective on May 24, 2021. Under the 2021 S-3, the Company was able to sell up to a total of $200.0 million of its securities. The 2021 S-3 expired on May 24, 2024. The Company sold approximately $4.4 million of securities under the 2021 S-3. On May 31, 2024, the Company filed a shelf registration statement on Form S-3 (File No. 333-279891) (the “2024 S-3”), which was declared effective on June 12, 2024. Under the 2024 S-3, the Company may sell up to a total