Company: PFIS
Filing Date: 2025-07-18
Form Type: S-4
Source: 0001104659-25-069074
Chunk: 1

Company: PEOPLES FINANCIAL SERVICES CORP.
Filing Date: 2025-07-18
Form: S-4
Chunk 1
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 “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| ​ | Large accelerated filer 
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 ​                       | ​ | ​ | Accelerated filer         
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| ​ | Non-accelerated filer   
 ☐                       
 ​                       | ​ | ​ | Smaller reporting company 
 ☐                         
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| ​ | ​                       | ​ | ​ | Emerging growth company   
 ☐                         
 ​                         | ​ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐ If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction: Exchange Act Rule 13e-4(i) (Cross-Border Issuer Tender Offer) ☐ Exchange Act Rule 14d-1(d) (Cross-Border Third-Party Tender Offer) ☐ THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION ACTING PURSUANT TO SAID SECTION 8(A) MAY DETERMINE.

TABLE OF CONTENTS

**The information in this prospectus is not complete and may be changed. A registration statement relating to the securities described in this prospectus has been filed with the Securities and Exchange Commission. We may not complete the exchange offer and these securities may not be issued until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus does not constitute an offer to sell or the solicitation of offers to buy these securities in any jurisdiction where the offer or sale is not permitted.**

<div align='center'>**PRELIMINARY — SUBJECT TO COMPLETION — DATED July 18, 2025**</div>

### PROSPECTUS

### OFFER TO EXCHANGE
<div align='center'>**UP TO