Company: PNBK
Filing Date: 2025-09-02
Form Type: 424B5
Source: 0001437749-25-028162
Chunk: 1

Company: PATRIOT NATIONAL BANCORP INC
Filing Date: 2025-09-02
Form: 424B5
Chunk 1
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 among us and the purchasers listed on the signature pages thereto is $1.25 per Share. The Warrants are being offered under a separate warrant purchase agreement dated as of August 29, 2025 at a price of $0.125 per Warrants and are exercisable after six months from the date of issuance at an initial exercise price of 1.56 per Warrant Share. The Securities are being offered directly to investors without a placement agent or underwriter. We are not paying underwriting discounts or commissions in connection with this offering.

|                                                                          |     | Per Share |       |     | Total |               |
|:-------------------------------------------------------------------------|:----|:----------|------:|:----|:------|--------------:|
| Common Stock Public offering price and proceeds to us, before expenses   |     | $         |  1.25 |     | $     | 23,995,000.00 |
| Warrant Shares Public offering price and proceeds to us, before expenses |     | $         | 0.125 |     | $     |  1,598,637.82 |

We anticipate that delivery of the Shares of Common Stock and Warrants against payment will be made on or about September 3, 2025, subject to satisfaction of customary closing conditions.

The date of this prospectus supplement is September 2, 2025

<div align='center'>TABLE OF CONTENTS

PROSPECTUS SUPPLEMENT</div>

| ABOUT THIS PROSPECTUS SUPPLEMENT                     | S-i   |
| CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS | S-iii |
| PROSPECTUS SUPPLEMENT SUMMARY                        | S-1   |
| THE OFFERING                                         | S-2   |
| RISK FACTORS                                         | S-3   |
| USE OF PROCEEDS                                      | S-4   |
| DIVIDEND POLICY                                      | S-5   |
| PLAN OF DISTRIBUTION                                 | S-6   |
| LEGAL MATTERS                                        | S-7   |
| EXPERTS                                              | S-7   |
| WHERE YOU CAN FIND MORE INFORMATION                  | S-7   |
| INFORMATION INCORPORATED BY REFERENCE                | S-7   |

<div align='center'>TABLE OF CONTENTS</div>

| ABOUT THIS PROSPECTUS                                |  1 |
| CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS |  2 |
| THE COMPANY                                          |