Company: PNBK
Filing Date: 2025-11-17
Form Type: 8-K
Source: 0001437749-25-035336
Chunk: 0

Company: PATRIOT NATIONAL BANCORP INC
Filing Date: 2025-11-17
Form: 8-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 8-K

### CURRENT REPORT
<div align='center'>Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 17, 2025</div>

#### PATRIOT NATIONAL BANCORP, INC.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Connecticut                  |     | 000-29599               |     | 06-1559137         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission File Number |     | -IRS Employer      
 Identification No. |

| 900 Bedford Street, Stamford, Connecticut |     |     06901 |
| (Address of principal executive offices)  |     | -Zip Code |

<div align='center'>Registrant’s telephone number including area code: ( 203) 252-5900

(Former name or former address, if changed since last report):</div>

#### Not Applicable
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                     |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Common Stock, par value $0.01 per share |     | PNBK              |     | NASDAQ Global Market                      |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b–2 of