Company: MBIO
Filing Date: 2025-02-27
Form Type: 424B3
Source: 0001104659-25-018303
Chunk: 11

Company: MUSTANG BIO, INC.
Filing Date: 2025-02-27
Form: 424B3
Chunk 11
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 fully prepaid, return receipt requested, (ii) by hand delivery      
 against a receipt, (iii) by Federal Express or a similar nationally recognized overnight courier service, or (iv) by electronic mail with       
 a confirmation copy delivered by another method set forth in this Paragraph 15. All such notices, demands, requests or other communications     
 shall be deemed to have been given for all purposes of this Bill of Sale Agreement upon the date of receipt or refusal, except that whenever    
 under this Bill of Sale Agreement a notice is either received (or refused) on a day which is not a business day or is required to be delivered  
 on or before a specific day which is not a business day, the day of receipt (or refusal) or required delivery shall automatically be extended   
 to the next business day. The address for proper notice to Escrow Agent under this Bill of Sale Agreement is set forth in the Escrow Agreement. 
 The addresses for proper notice to Seller or Buyer under this Bill of Sale Agreement are as follows:                                            |

| As to Seller:   | [***] |
| With a copy to: | [***] |
| As to Buyer:    | [***] |
| With a copy to: | [***] |

| 16. | This Bill of Sale Agreement is governed by and is to be construed under the laws of the Commonwealth of                                  
 Massachusetts and may be executed in several counterparts (which counterparts may be executed and delivered by PDF, DocuSign, or another 
 electronic signature file sent by email), each of which shall be deemed an original, and all such counterparts together shall constitute 
 one and the same instrument. Any executed counterpart of this Agreement delivered by PDF, or another file sent by email shall be equally 
 effective as an original counterpart for all purposes.                                                                                   |

<div align='center'>[signature page follows]

6</div>

IN WITNESS WHEREOF, this Bill of Sale Agreement is executed
as of the date first above written.

| SELLER:                |                     |     | BUYER:                         |                      |
| Mustang Bio, Inc.      |                     |     | AbbVie Bioresearch Center Inc. |                      |
| a Delaware corporation |                     |     | a Delaware corporation         |                      |
| By:                    | /s/ Manuel Litchman |     | By:                            | /s/ Stefan Geldmeyer |
| Name: Manuel Litchman  |                     |     | Name: Stefan Geldmeyer         |                      |