# EDGAR Filing Document

**Accession Number:** 0001370416
**File Stem:** 0001370416-26-000011
**Filing Date:** 2026-5
**Character Count:** 9050
**Document Hash:** 4c021c03a08472813fee67694621a1c5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001370416-26-000011.hdr.sgml**: 20260521

**ACCESSION NUMBER**: 0001370416-26-000011

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 8

**CONFORMED PERIOD OF REPORT**: 20260521

**FILED AS OF DATE**: 20260521

**DATE AS OF CHANGE**: 20260521

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WESTPORT FUEL SYSTEMS INC.
- **CENTRAL INDEX KEY:** 0001370416
- **STANDARD INDUSTRIAL CLASSIFICATION:** ENGINES & TURBINES [3510]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34152
- **FILM NUMBER:** 261009801

**BUSINESS ADDRESS:**
- **STREET 1:** 1691 WEST 75TH AVENUE
- **CITY:** VANCOUVER
- **STATE:** A1
- **ZIP:** V6P6G2
- **BUSINESS PHONE:** 6047182000

**MAIL ADDRESS:**
- **STREET 1:** 1691 WEST 75TH AVENUE
- **CITY:** VANCOUVER
- **STATE:** A1
- **ZIP:** V6P6G2

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WESTPORT INNOVATIONS INC
- **DATE OF NAME CHANGE:** 20060726

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

**FORM 6-K** 

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2026

Commission File Number: 001-34152

**WESTPORT FUEL SYSTEMS INC.** 

(Translation of registrant's name into English)

**1691 West 75th Avenue, Vancouver, British Columbia, Canada, V6P 6P2** 

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

☒ Form 20-F&nbsp;&nbsp;&nbsp;&nbsp;⬜ Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): □

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): □

**<u>INCORPORATION BY REFERENCE</u>**

Exhibits 99.1, 99.2 and 99.3 to this report on Form 6-K are hereby incorporated by reference into the Company's Registration Statement on Form F-3 (File no. 333-289669) and the Registration Statements on Form S-8 (File Nos. 333-248912, 333-211726, and 333-168847).

**<u>EXHIBIT INDEX</u>**

---

| | |
|:---|:---|
| Exhibit | Description |
| 99.1 | <u>[Notice of Change of Auditor](westportfuelsystemsinc-n.htm)</u> |
| 99.2 | <u>[Letter from predecessor auditor addressed to Canadian securities regulatory authorities](westportfuelsystemsincch.htm)</u> |
| 99.3 | <u>[Letter from successor auditor addressed to Canadian securities regulatory authorities](letterfromsuccessoraudit.htm)</u> |

---

**<u>SIGNATURES</u>**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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---

| | |
|:---|:---|
| **WESTPORT FUEL SYSTEMS INC.** | **WESTPORT FUEL SYSTEMS INC.** |
| By: | /s/ Elizabeth Owens |
| Name: | Elizabeth Owens |
| Title: | Chief Financial Officer |

---

Date: May 21, 2026

## Exhibit 99.1

![](westportfuelsystemsinc-n001.jpg)

Westport™ May 8, 2026 KPMG LLP PO Box 10426 Deloitte LLP 410 W. Georgia Street Vancouver, British Columbia V6B 0S7 777 Dunsmuir Street, 11th floor Vancouver, British Columbia V7Y 1K3 AND TO: British Columbia Securities Commission, as Principal Regulator Ontario Securities Commission Dear Sirs: Alberta Securities Commission Financial and Consumer Affairs Authority of Saskatchewan Manitoba Securities Commission Autorite des Marches Financiers Nova Scotia Securities Commission Superintendent of Securities, Department of Justice and Public Safety, Prince Edward Island Financial and Consumer Services Commission of New Brunswick Office of the Superintendent of Securities, Service NL Securities and Exchange Commission Re: Notice Pursuant to National Instrument 51-102 This Notice is delivered to you pursuant to National Instrument 51-102 - Continuous Disclosure Obligations ("NI 51-102 ") in connection with the change of auditors of Westport Fuel Systems Inc. ("Westport"). In connection with this matter and pursuant to section 4.11 of NI 51-102, please be advised that: 1. KPMG LLP (the "Former Auditor"), has delivered notice dated May 7, 2026 that the Former Auditor will not stand for reappointment as the auditor of Westport in respect of the year ending December 31, 2026 (the "Resignation"); 2. Subject to approval by Westport's shareholders at the next annual meeting of shareholders (the "Meeting"), and effective as at the date of the Meeting, Deloitte LLP ("Successor Auditor") has been appointed as the auditor of Westport to fill the vacancy and to hold office from the date of the Meeting until the close of the next annual meeting of shareholders of Westport (the "Appointment"); 3. the Resignation and the Appointment were considered and approved by Westport's Audit Committee and board of directors effective May 8, 2026; 4. none of the Former Auditor's reports on any of Westport's financial statements relating to the period beginning January 1, 2024 and ending on May 8, 2026 expressed a modified opinion; and 1691 West 75th Avenue » Vancouver, BC, Canada V6P 6P2 » +1 604-718-2000 » westport.com

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![](westportfuelsystemsinc-n002.jpg)

Westport™ 5. in the opinion of Westport, there are no "reportable events" (as such term is defined in NI 51-102). NI 51-102 requires that the Former Auditor and Successor Auditor review this Notice and respond to this Notice by way of letter addressed to the applicable securities commissions (being those indicated above). Such letter must include a statement in respect of each of the statements above stating whether the Former Auditor and Successor Auditor either: (i) agree, (ii) disagree, and the reasons why, or (iii) has no basis to agree or disagree, in respect of each point. We would ask that you kindly prepare the required response letters and arrange for two originally signed copies of the same to be delivered to the undersigned (along with an email containing an electronic version of the same) on or prior to May 15, 2026. We trust you will find the foregoing to be in order. If you have any questions or comments relating to this matter, please do not hesitate to contact the undersigned. Yours truly, WESTPORT FUEL SYSTEMS INC. (signed) "Elizabeth Owens" Elizabeth Owens Chief Financial Officer 1691 West 75th Avenue » Vancouver, BC, Canada V6P 6P2 » +1 604-718-2000 » westport.com

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## Exhibit 99.2

![](westportfuelsystemsincch001.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;KPMG LLP PO Box 10426 777 Dunsmuir Street Vancouver BC V7Y 1K3 Canada Telephone (604) 691-3000 Fax (604) 691-3031 KPMG LLP, an Ontario limited liability partnership and member firm of the KPMG global organization of independent member firms affiliated with KPMG International Limited, a private English company limited by guarantee. KPMG Canada provides services to KPMG LLP. Document classification: Confidential. British Columbia Securities Commission, as Principal Regulator Ontario Securities Commission Alberta Securities Commission Saskatchewan Financial Services Commission - Securities Division The Manitoba Securities Commission Autorite des Marches Financiers Nova Scotia Securities Commission Prince Edward Island, Office of the Attorney General Securities Division New Brunswick, Securities Administration Branch Securities Commission of Newfoundland and Labrador May 11, 2026 Dear Madam: Re: Notice of Change of Auditors of Westport Fuel Systems Inc. We have read the Notice of Change in Auditor submitted to KPMG by Westport Fuel Systems Inc. dated May 8, 2026 (the "Notice") and are in agreement with the statements contained in the Notice. Yours very truly,

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## Exhibit 99.3

![](letterfromsuccessoraudit001.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;Deloitte LLP 410 West Georgia Street Vancouver BC V6B 0S7 Canada Tel : 604-669-4466 Fax : 778-374-0496 www.deloitte.ca May 15, 2026 To: British Columbia Securities Commission Alberta Securities Commission Autorité des marchés financiers Financial and Consumers Affairs Authority of Saskatchewan Financial and Consumer Services Commission of New Brunswick Manitoba Securities Commission Nova Scotia Securities Commission Office of the Superintendent of Securities, Service NL Ontario Securities Commission Superintendent of Securities, Department of Justice and Public Safety, Prince Edward Island Dear Sirs/Mesdames: RE: Notice of Change of Auditor – Westport Fuel Systems Inc. (the "Company") As required by subparagraph (6)(a)(ii) of section 4.11 of National Instrument 51-102, we have reviewed the change of auditor notice of the Company dated May 8, 2026 (the "Notice") and, based on our knowledge of such information at this time, we agree with statements 2 and 3 as it relates to Deloitte LLP, and we have no basis to agree or disagree with statements 1, 4 and 5 contained in the Notice. Yours truly, /s/ Deloitte LLP Chartered Professional Accountants

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