Company: ARMP
Filing Date: 2025-12-01
Form Type: 424B5
Source: 0001104659-25-117382
Chunk: 1

Company: Armata Pharmaceuticals, Inc.
Filing Date: 2025-12-01
Form: 424B5
Chunk 1
---
 commissions or discounts. We have also
agreed to provide indemnification and contribution to Jones with respect to certain liabilities, including liabilities under the Securities
Act. See the “Plan of Distribution” section of this prospectus supplement regarding the compensation to be paid to Jones.

Investing in our securities is speculative and involves a high degree of risk. See the sections entitled “ Risk Factors” beginning on page S-13of this prospectus supplement and in the accompanying base prospectus and the other documents that are incorporated by reference herein for a discussion of information that should be considered in connection with an investment in our securities. You should read this prospectus supplement and the accompanying base prospectus carefully before you invest.

Neither the U.S. Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying base prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

<div align='center'>The date of this prospectus supplement is December 1, 2025.

TABLE OF CONTENTS

Prospectus Supplement</div>

|                                                   | Page |
| ABOUT THIS PROSPECTUS SUPPLEMENT                  | S-1  |
| SPECIAL NOTE REGARDING FORWARD LOOKING STATEMENTS | S-2  |
| PROSPECTUS SUPPLEMENT SUMMARY                     | S-5  |
| THE OFFERING                                      | S-12 |
| RISK FACTORS                                      | S-13 |
| USE OF PROCEEDS                                   | S-15 |
| DILUTION                                          | S-16 |
| DESCRIPTION OF SECURITIES WE ARE OFFERING         | S-18 |
| PLAN OF DISTRIBUTION                              | S-20 |
| LEGAL MATTERS                                     | S-22 |
| EXPERTS                                           | S-22 |
| WHERE YOU CAN FIND MORE INFORMATION               | S-22 |
| INCORPORATION OF CERTAIN INFORMATION BY REFERENCE | S-22 |

<div align='center'>Prospectus</div>

| ABOUT                                     
 THIS PROSPECTUS                           |  1 |
| SUMMARY                                   |  2 |
| RISK                                      
 FACTORS                                   |  8 |
| THE                                       
 SECURITIES WE MAY OFFER                   |  9 |
| SPECIAL                                   
 NOTE REGARDING FORWARD-LOOKING STATEMENTS | 11 |
| USE                                       
 OF PROCEEDS                               | 14 |
| DESCRIPTION                               
 OF CAPITAL STOCK                          | 15 |
| DESCRIPTION                               
 OF THE DEBT SECURITIES