Company: PNBK
Filing Date: 2025-09-02
Form Type: 424B5
Source: 0001437749-25-028162
Chunk: 0

Company: PATRIOT NATIONAL BANCORP INC
Filing Date: 2025-09-02
Form: 424B5
Chunk 0
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Filed pursuant to Rule 424(b)(5)

Registration No. 333-287283

PROSPECTUS SUPPLEMENT

(To Prospectus dated May 22, 2025)

<div align='center'>PATRIOT NATIONAL BANCORP, INC.

31,985,103 Shares of Common Stock</div>

We are offering 31,985,103 shares of our common stock, par value $0.01 per share , referred to as the “Shares,” or “Common Stock,” directly to certain accredited investors, referred to as the “purchasers,” pursuant to this prospectus supplement and the accompanying prospectus. The Shares consist of (a) 19,196,000 shares of our voting Common Stock (“Voting Common Stock”), and (b) 12,789,103 shares of our Common Stock issuable upon exercise of three year warrants (the “Warrants”) entitling certain of the purchasers to purchase, after six months following closing of the Offering, shares of non-voting Common Stock (“Non-Voting Common Stock”) which, may be exchanged for shares of Voting Common Stock upon such purchasers meeting the Non-Control Conditions described elsewhere in this prospectus (the “Warrant Shares”). The Voting Common Stock, the Warrants and the underlying Warrant Shares are sometimes collectively referred to as the “Securities.” We are not registering the Warrants pursuant to this prospectus.

Our Common Stock is listed on The Nasdaq Global Market, or “Nasdaq,” under the symbol “PNBK”. On August 28, 2025, the last reported sale price of our Common Stock, as reported on Nasdaq, was $1.56 per share.

Investing in our securities involves a high degree of risk. Before buying any securities, you should carefully read the discussion of the risks of investing in our securities in“Risk Factors” beginning on page S-3 of this prospectus supplement and page 4 of the accompanying prospectus and any other risk factors contained in the documents incorporated by reference into this prospectus supplement and the accompanying prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

The purchase price of each Share of Voting Common Stock offered to the purchasers identified in the stock purchase agreement, dated as of August 29, 2025 (the “Stock Purchase Agreement”), by and