Westport JV revenue up 125% as HPDI 3.0 detailed

Westport’s joint venture Cespira detailed its next-generation HPDI 3.0 system and plans to start production in late 2026 with vehicles expected in early 2027.

Rhea-AI Filing Summary

Westport Fuel Systems Inc. (WPRT) announced that Cespira, its joint venture with Volvo Group, has revealed technical details of HPDI™ 3.0, the next generation of its High Pressure Direct Injection fuel system for heavy-duty applications. The new system enhances fuel rail-pressure control, improves hardware durability and offers a more modular architecture, supporting liquefied natural gas (LNG) and renewable bioLNG while remaining adaptable to future low- and zero-carbon fuels such as hydrogen.

The upgraded architecture targets better fuel economy and engine performance, supports higher injection pressures and is designed to help meet future global emissions regulations. HPDI 3.0 is intended for larger engines, including V12 and multi-bank configurations, broadening its use in demanding on-road and off-road sectors. Cespira’s revenue increased 125% year over year from Q2 2025 to Q2 2026, and the current HPDI generation has accumulated more than 3 billion kilometers of operation across over 12,000 trucks in more than 35 countries. Cespira plans to begin HPDI 3.0 production in the fourth quarter of 2026, with the first equipped vehicles expected on the road in early 2027.

Filing Explained

The September 14 Form 6-K furnishes Westport’s press release, but HPDI 3.0 remains planned rather than completed: its production and vehicle timing depends on development, integration, validation, certification, and required approvals, so no launch is reported.

Key Figures

Cespira revenue growth: 125% year-over-year increase HPDI real-world operation distance: Over 3,000,000,000 kilometers Trucks using HPDI technology: More than 12,000 trucks +3 more

6 metrics

Cespira revenue growth 125% year-over-year increase From Q2 2025 to Q2 2026

HPDI real-world operation distance Over 3,000,000,000 kilometers Cumulative operation of current HPDI generation

Trucks using HPDI technology More than 12,000 trucks Current HPDI-equipped vehicles in service

Countries with HPDI-equipped trucks Over 35 countries Geographic reach of existing HPDI systems

HPDI 3.0 production start Fourth quarter of 2026 Planned commencement of HPDI 3.0 production

First HPDI 3.0 vehicles on road Early 2027 Expected initial deployment timing

Key Terms

High Pressure Direct Injection, liquefied natural gas, renewable natural gas, homologation, +2 more

6 terms

High Pressure Direct Injection technical

"HPDI™ 3.0, the next generation of its proven High Pressure Direct Injection fuel system"

liquefied natural gas financial

"The new fuel system supports liquefied natural gas (LNG) and renewable bio-based"

Liquefied natural gas (LNG) is natural gas that has been cooled into a liquid so it can be shipped and stored more easily—think of it like condensing a bulky gas into a compact, refrigerated form for transport. It matters to investors because LNG supply, shipping capacity, and long-term contracts influence energy prices, company revenues, and exposure to geopolitical or infrastructure risks, much like how a clogged highway can delay deliveries and raise costs.

renewable natural gas financial

"As a leading supplier of affordable, alternative fuel, low-emissions transportation technologies"

Renewable natural gas is methane captured from organic waste—like landfills, farms, or wastewater—and cleaned to the same quality as conventional pipeline gas so it can be used for heating, electricity, or vehicle fuel. Investors care because it turns waste into a revenue-generating commodity, can qualify for carbon credits or government incentives, and can reduce a company's emissions profile, affecting long-term costs, regulatory risk, and market demand much like converting trash into sellable fuel.

homologation regulatory

"regulatory approvals, certifications and homologation, changes in laws, regulations"

Homologation is the formal approval or certification from a regulatory body that a product, device, or process meets required safety, performance, or legal standards before it can be sold or used in a particular market. For investors, homologation is important because it unlocks a company’s ability to bring products to market and generate revenue—think of it like a vehicle passing inspection before it can legally drive on public roads, without which sales and growth can be blocked or delayed.

OEMs technical

"strengthening the case for broader adoption by OEMs and operators worldwide"

OEMs, or Original Equipment Manufacturers, are companies that produce the main components or products that other companies use to build finished goods. For investors, OEMs are important because their performance can influence the supply chain, manufacturing costs, and overall market trends in industries like technology, automotive, and electronics. Their success often reflects broader economic health and consumer demand.

bioLNG financial

"enabling the use of LNG and bioLNG with diesel-like performance"

BioLNG is renewable natural gas that has been cooled into a liquid so it can be stored and shipped like conventional liquefied natural gas; think of it as compressed plant- and waste-derived fuel turned into a portable, cold-packed form. It matters to investors because it creates a low‑carbon substitute for diesel and fossil gas, opening new markets, pricing premiums, infrastructure needs and policy incentives that can drive revenue growth or capital investment risks for companies involved in production, transport, and fueling.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did WPRT announce about the HPDI 3.0 system in this 6-K?

Westport announced that Cespira, its joint venture with Volvo Group, released technical details of HPDI 3.0, featuring improved fuel rail-pressure control, higher injection pressure capability, enhanced durability and a more modular architecture for LNG, bioLNG and future low- and zero-carbon fuels.

How fast is Cespira’s revenue growing according to Westport (WPRT)?

Cespira’s revenue increased 125% year over year from Q2 2025 to Q2 2026, which Westport states underscores strong market validation for HPDI technology and supports expectations for continued adoption by OEMs and fleet operators.

When will HPDI 3.0 production and vehicle deployment begin for WPRT’s joint venture?

Cespira plans to begin production of HPDI 3.0 in the fourth quarter of 2026, with the first HPDI 3.0 equipped vehicles expected to be on the road in early 2027, subject to successful development, validation and required approvals.

What fuels does HPDI 3.0 support for Westport (WPRT) and Cespira?

HPDI 3.0 supports liquefied natural gas (LNG) and renewable bioLNG while maintaining adaptability for future low- and zero-carbon fuels, including potential hydrogen applications, as those fuel markets develop.

How widely has Westport’s existing HPDI technology been deployed?

The current generation of HPDI technology has accumulated more than 3 billion kilometers of real-world operation across 12,000+ trucks operating in more than 35 countries, providing an operational foundation for HPDI 3.0.

What markets and engine types is HPDI 3.0 intended to serve for WPRT?

HPDI 3.0 is designed for heavy-duty transport and supports larger engines, including V12 and multi-bank configurations, broadening its application across demanding on-road and off-road sectors while targeting compliance with future emissions regulations.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/15/2026 - 06:03 AM Accepted by SEC EDGAR 09/14/2026 - 06:23 PM Learn about SEC filing dates

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 September 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 ]      Form 40-F [   ]

On September 14, 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 September 14, 2026

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.

		WESTPORT FUEL SYSTEMS INC.
		(Registrant)
Date: September 14, 2026		/s/ Elizabeth Owens
		Elizabeth Owens
		Chief Financial Officer

EXHIBIT 99.1

Cespira™, the Joint Venture between Westport and Volvo Group, reveals how HPDI™ 3.0 advances fuel economy and expands OEM options

Enhanced rail-pressure control, improved durability and more adaptable architecture deliver greater performance and integration flexibility, strengthening the case for broader adoption by OEMs and operators worldwide

VANCOUVER, British Columbia, Sept. 14, 2026 (GLOBE NEWSWIRE) -- Westport Fuel Systems Inc. (“Westport") (TSX:WPRT / Nasdaq: WPRT), today announced Cespira, its joint venture with Volvo Group, released new technical details of HPDI™ 3.0, the next generation of its proven High Pressure Direct Injection fuel system.

HPDI 3.0 retains proven HPDI combustion principles while advancing fuel rail-pressure control, hardware durability and system integration. The new fuel system supports liquefied natural gas (LNG) and renewable bio-based liquefied natural gas (bioLNG) today while preserving adaptability for future low- and zero-carbon fuels.

Performance Enhancements
At its core, HPDI 3.0 incorporates a new fuel rail-pressure control architecture that improves fuel economy and engine performance while simplifying OEM calibration. Higher injection pressure capability unlocks greater power and efficiency from the latest high-performance compression-ignition engines, while the architecture is designed to support compliance with future global emissions regulations.

Improved Durability and Greater Integration Flexibility
The new hardware integrates proven HPDI injector dynamic sealing technology to enhance component service life. A modular fuel rail-pressure control architecture gives OEMs greater packaging flexibility across different engine layouts. The new system supports larger engines, including V12 and other multi-bank configurations, by allowing fuel pressure control across separate cylinder banks. This broadens the potential application of HPDI 3.0 across demanding on-road and off-road sectors.

Built for Natural Gas and Biogas Today, Adaptable for Future Fuels
HPDI 3.0 reinforces the near-term value of natural gas and renewable natural gas for heavy-duty transport by enabling the use of LNG and bioLNG with diesel-like performance, improved efficiency and attractive total cost of ownership. The architecture also maintains a clear pathway for future fuel-specific applications, including hydrogen, as those markets develop.

“Cespira’s revenue increased 125% year over year from Q2 2025 to Q2 2026, underscoring strong market validation for HPDI technology. With continued gains in efficiency, attractive total cost of ownership and improved fuel price stability, we believe HPDI is well positioned to grow adoption momentum with OEMs and fleets,” said Dan Sceli, Chief Executive Officer of Westport.

“HPDI 3.0 strengthens both the immediate and long-term business case for OEMs. More precise fuel rail pressure control, higher injection pressure capability, enhanced durability and improved fuel economy make HPDI 3.0 a more compelling proposition for LNG and BioLNG applications. The architecture is also more readily adaptable to future fuel-specific systems for hydrogen and low-carbon fuels, giving OEMs greater flexibility to build on their HPDI investment and expand their product portfolios as those fuel markets develop,” said Scott Baker, CTO of Cespira.

HPDI 3.0 builds on a proven technology foundation, with the current generation accumulating more than 3 billion kilometers of real-world operation across 12,000+ trucks in over 35 countries. Cespira will begin production of HPDI 3.0 in the fourth quarter of 2026, with the first HPDI 3.0 equipped vehicles expected on the road in early 2027.

More information about Cespira can be found at www.Cespira.com.

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 alternative 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.

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 HPDI™3.0 fuel system; the timing for commencement of production for HPDI 3.0 equipped vehicles and for such vehicles to be in operation; 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, integrate, validate, and certify HPDI technology on expected timelines or at all; the results of testing and development activities and the ability to achieve required performance, durability, reliability, safety and regulatory requirements; the receipt and timing of required regulatory approvals, certifications and homologation, changes in laws, regulations and standards and incentive programs applicable to emissions, engine certification and vehicle classification; 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

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