# EDGAR Filing Document

**Accession Number:** 0001370416
**File Stem:** 0001171843-26-002168
**Filing Date:** 2026-4
**Character Count:** 8343
**Document Hash:** 7b47d035ca473b0420219dbef372334f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001171843-26-002168.hdr.sgml**: 20260401

**ACCESSION NUMBER**: 0001171843-26-002168

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20260401

**FILED AS OF DATE**: 20260401

**DATE AS OF CHANGE**: 20260401

**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:** 26828631

**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 April 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 office)

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

Form 20-F [ X ] &nbsp;&nbsp;&nbsp;&nbsp; Form 40-F [ ]

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**INCORPORATION BY REFERENCE**

Exhibit 99.1 to this Form 6-K is hereby incorporated by reference into the Company's Registration Statement on Form F-3 (File No.333-289669) and the Registration Statement on Form S-8, as amended (Registration No.333-248912).

On April 1, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

[(c) Exhibit 99.1. Press release dated April 1, 2026](exh_991.htm)

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**SIGNATURES**

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.

---

| | |
|:---|:---|
|  | <u>**&nbsp;&nbsp;&nbsp;&nbsp;WESTPORT FUEL SYSTEMS INC.&nbsp;&nbsp;&nbsp;&nbsp;**</u> |
|  | (Registrant) |
| Date: April 1, 2026 | <u>&nbsp;&nbsp;&nbsp;&nbsp;/s/ Elizabeth Owens&nbsp;&nbsp;&nbsp;&nbsp;</u> |
|  | Elizabeth Owens |
|  | Chief Financial Officer |

---

## Exhibit 99.1

**EXHIBIT 99.1**

![logo](exh991small_1.jpg)

**Cespira's Hydrogen HPDI™ Fuel System Now in On-Road Testing**

**Advancing HPDI Technology for Hydrogen Fuel**

"On-road testing is a key milestone in demonstrating that Cespira's hydrogen HPDI fuel system is a cost-effective solution that operates on a zero-carbon fuel while delivering best-in-class power, torque, and efficiency," said Dan Sceli, Chief Executive Officer of Westport. "Hydrogen use in an internal combustion engine with Cespira's HPDI fuel system delivers nearly 100% CO2 reductions over diesel fueled trucks while allowing OEMs to preserve their existing engine architecture, leverage existing engineering talent and experience, installed investments, and decades of technology development in vehicle powertrain design, supply chain, and manufacturing."

Cespira's HPDI fuel system, running on LNG and bioLNG, is a well-established and reliable commercial platform. It is used in over 10,000 Volvo LNG trucks worldwide. The hydrogen powered version of HPDI uses fundamentally the same system that has been proven for LNG with a few small variations. Hydrogen HPDI is a high-performance solution to support climate neutrality in the heavy-duty mobility sector that is capable of being classified as a Zero Emissions Vehicle under the EU CO2 emissions standards. Moreover, hydrogen can be produced from different feedstock than fossil fuels. For example, green hydrogen is created from water. This makes hydrogen a promising option to deliver energy security and independence in various regions around the world and positioning it as an attractive fuel for the future.

More information about Cespira, a joint venture between Westport and Volvo AB can be found here.

**About Westport** 

Westport is a technology and innovation company connecting synergistic technologies to power a cleaner tomorrow. As a leading supplier of affordable, alternative fuel, low-emissions transportation technologies, we design, manufacture, and supply advanced components and systems that enable the transition from traditional fuels to cleaner energy solutions.

Our proven technologies support a wide range of clean fuels – including natural gas, renewable natural gas, and hydrogen – empowering OEMs and commercial transportation industries to meet performance demands, regulatory requirements, and climate targets in a cost-effective way. With decades of expertise and a commitment to engineering excellence, Westport is helping our partners achieve sustainability goals—without compromising performance or cost-efficiency – making clean, scalable transport solutions a reality.

Westport is headquartered in Vancouver, Canada. For more information, visit www.westport.com.

***Cautionary Note Regarding Forward Looking Statements***

*This press release contains forward-looking statements, including statements regarding, among other things, the anticipated performance, efficiency and emissions characteristics of Cespira's hydrogen HPDI™ fuel system; the expected benefits of hydrogen use in internal combustion engines; the progress, timing and outcomes of on-road testing and development activities; the timing and likelihood of potential future commercialization and launch of hydrogen-powered heavy-duty trucks; the ability for hydrogen HPDI technology to support climate neutrality and to be classified as a zero-emissions vehicle under applicable standards; the availability, adoption and market demand for hydrogen and related infrastructure; and the intentions, plans and actions of our joint venture and other partners. Forward-looking statements are based on management's current expectations and assumptions and are subject to known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements to differ materially from those expressed or implied by such forward-looking statements.These risks, uncertainties and assumptions include, among others: the ability of Westport, Cespira and their partners to successfully develop, validate and commercialize hydrogen HPDI technology on expected timelines or at all; the results of testing and the ability to achieve required performance, durability, reliability, safety and regulatory requirements; the availability and cost of hydrogen (including renewable/low-carbon hydrogen), refueling and distribution infrastructure and related supply chains; customer acceptance and adoption rates for hydrogen-powered vehicles; changes in laws, regulations and standards applicable to emissions, zero-emissions vehicle classification and incentives; competitive technologies and products; general economic and market conditions; as well as other risk factors, uncertainties and assumptions that may affect our actual results, performance, achievements or financial position discussed in our most recent Annual Information Form and other filings with securities regulators. Readers should not place undue reliance on any such forward-looking statements, which speak only as of the date they were made. We disclaim any obligation to publicly update or revise such statements to reflect any change in our expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in these forward looking statements except as required by National Instrument 51-102. The contents of any website, RSS feed or twitter account referenced in this press release are not incorporated by reference herein.*

**Contact Information**

Westport Investor Relations

**T:** +1 604-718-2046