Company: INMB
Filing Date: 2025-04-25
Form Type: DEFA14A
Source: 0001213900-25-035538
Chunk: 0

Company: Inmune Bio, Inc.
Filing Date: 2025-04-25
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(RULE 14a-101)

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment
No. )</div>

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the                       
 Commission Only (as permitted by Rule 14a-6(e)(2)) |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material under §240.14a-12 |

<div align='center'>INMUNE BIO INC.

(Name of Registrant as Specified In Its Charter)

N/A

(Name of Person(s) Filing Proxy Statement, if other
than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per 
 Exchange Act Rules 14a6(i)(1) and 0-11.                     |

<div align='center'>SUPPLEMENT TO THE PROXY STATEMENT

FOR THE ANNUAL MEETING OF STOCKHOLDERS

OF INMUNE BIO INC.

TO BE HELD ON MAY 28, 2025</div>

On April 21, 2025, INmune Bio Inc. (the “Company”)
filed a definitive proxy statement (the “Proxy Statement”) with the Securities and Exchange Commission for the Company’s
Annual Meeting of Stockholders to be held on May 28, 2025 (the “Annual Meeting”). Prior to distribution to our stockholders,
the Company is filing this supplement to its Proxy Statement solely to correct an inadvertent typographical error with respect to the
voting standard for Proposal 5 - To approve the Second Amended and Restated INmune Bio Inc. 2021 Stock Incentive Plan (“Proposal 5”). Except as specifically supplemented by the information contained below, all information set forth in the Proxy Statement
remains unchanged.

On page 3 of the Questions and Answers section of the Proxy Statement
under the caption titled “[w