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Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars)
WESTPORT FUEL SYSTEMS INC.
For the three and nine months ended September 30, 2025 and 2024

WESTPORT FUEL SYSTEMS INC.
Condensed Consolidated Interim Balance Sheets (unaudited)
(Expressed in thousands of United States dollars, except share amounts)
September 30, 2025 and December 31, 2024

|  | September 30, 2025 |  | December 31, 2024
Assets |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents (including restricted cash) |  | $ | 33,096 |  |  | $ | 14,754 |
Accounts receivable (note 6) |  | 13,194 |  |  | 18,738 |
Inventories (note 7) |  | 3,397 |  |  | 6,668 |
Prepaid expenses |  | 1,114 |  |  | 1,328 |
Current assets held for sale (note 5) |  | — |  |  | 128,398 |
Total current assets |  | 50,801 |  |  | 169,886 |
Long-term investments (note 8) |  | 44,121 |  |  | 36,866 |
Property, plant and equipment (note 9) |  | 5,063 |  |  | 3,120 |
Operating lease right-of-use assets |  | 1,822 |  |  | 823 |
Other long-term assets |  | 2,286 |  |  | 1,431 |
Non-current assets held for sale (note 5) |  | — |  |  | 79,495 |
Total assets |  | $ | 104,093 |  |  | $ | 291,621 |
Liabilities and shareholders’ equity |  |  |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities (note 10) |  | $ | 15,550 |  |  | $ | 19,435 |
Current portion of operating lease liabilities |  | 627 |  |  | 288 |
Current portion of long-term debt (note 11) |  | 3,903 |  |  | 3,905 |
Current portion of warranty liability |  | 1,215 |  |  | 1,152 |
Current liabilities held for sale (note 5) |  | — |  |  | 84,488 |
Total current liabilities |  | 21,295 |  |  | 109,268 |
Long-term operating lease liabilities |  | 1,184 |  |  | 548 |
Long-term debt (note 11) |  | — |  |  | 2,932 |
Other long-term liabilities |  | 1,389 |  |  | 1,388 |
Long-term liabilities held for sale (note 5) |  | — |  |  | 40,460 |
Total liabilities |  | 23,868 |  |  | 154,596 |
Shareholders’ equity: |  |  |  |
Share capital (note 12): |  |  |  |
Unlimited common and preferred shares, no par value |  |  |  |
17,351,005 (2024 - 17,282,934) common shares issued and outstanding |  | 1,246,643 |  |  | 1,245,805 |
Other equity instruments |  | 9,011 |  |  | 9,472 |
Additional paid in capital |  | 11,516 |  |  | 11,516 |
Accumulated deficit |  | (1,146,796) |  |  | (1,096,275) |
Accumulated other comprehensive loss |  | (40,149) |  |  | (33,493) |
Total shareholders' equity |  | 80,225 |  |  | 137,025 |
Total liabilities and shareholders' equity |  | $ | 104,093 |  |  | $ | 291,621 |
Commitments and contingencies (note 14) |  |  |  |
Subsequent events (note 5) |  |  |  |

See accompanying notes to condensed consolidated interim financial statements.

Approved on behalf of the Board: | Anthony Guglielmin | Director | Daniel Sceli | Director

1

WESTPORT FUEL SYSTEMS INC.
Condensed Consolidated Interim Statements of Operations and Comprehensive Loss (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Revenue |  | $ | 1,617 |  |  | $ | 4,877 |  |  | $ | 21,438 |  |  | $ | 33,414 |
Cost of revenue |  | 1,145 |  |  | 4,214 |  |  | 18,589 |  |  | 30,934 |
Gross profit |  | 472 |  |  | 663 |  |  | 2,849 |  |  | 2,480 |
Operating expenses: |  |  |  |  |  |  |  |
Research and development |  | 2,319 |  |  | 628 |  |  | 5,186 |  |  | 8,437 |
General and administrative |  | 4,130 |  |  | 3,416 |  |  | 10,908 |  |  | 16,331 |
Sales and marketing |  | 305 |  |  | 367 |  |  | 1,038 |  |  | 2,450 |
Foreign exchange (gain) loss |  | 1,282 |  |  | (1,709) |  |  | (4,145) |  |  | 86 |
Depreciation and amortization |  | 146 |  |  | 103 |  |  | 360 |  |  | 559 |
|  | 8,182 |  |  | 2,805 |  |  | 13,347 |  |  | 27,863 |
Loss from continuing operations |  | (7,710) |  |  | (2,142) |  |  | (10,498) |  |  | (25,383) |
Loss from investments accounted for by the equity method |  | (3,197) |  |  | (3,002) |  |  | (10,767) |  |  | (4,104) |
Gain on deconsolidation |  | — |  |  | — |  |  | — |  |  | 13,266 |
Loss on sale of investments |  | — |  |  | (352) |  |  | — |  |  | (352) |
Interest on long-term debt |  | (142) |  |  | (257) |  |  | (500) |  |  | (859) |
Interest and other income (loss), net of bank charges |  | 653 |  |  | 215 |  |  | 1,155 |  |  | 235 |
Loss before income taxes |  | (10,396) |  |  | (5,538) |  |  | (20,610) |  |  | (17,197) |
Income tax expense |  | 14 |  |  | 430 |  |  | 148 |  |  | 646 |
Net loss from continuing operations |  | (10,410) |  |  | (5,968) |  |  | (20,758) |  |  | (17,843) |
Net income (loss) from discontinued operations (note 5) |  | (3,316) |  |  | 2,100 |  |  | (29,763) |  |  | 6,144 |
Net loss for the period |  | (13,726) |  |  | (3,868) |  |  | (50,521) |  |  | (11,699) |
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Cumulative translation adjustment |  | (4,456) |  |  | 2,177 |  |  | 6,106 |  |  | 535 |
Reclassification of accumulated foreign currency translation on disposal of operations |  | (10,070) |  |  | — |  |  | (10,070) |  |  | — |
Ownership share of equity method investments' other comprehensive loss |  | (399) |  |  | (809) |  |  | (2,692) |  |  | (892) |
|  | (14,925) |  |  | 1,368 |  |  | (6,656) |  |  | (357) |
Comprehensive loss |  | $ | (28,651) |  |  | $ | (2,500) |  |  | $ | (57,177) |  |  | $ | (12,056) |
Net income (loss) per share: |  |  |  |  |  |  |  |
From continuing operations - basic |  | $ | (0.60) |  |  | $ | (0.35) |  |  | $ | (1.20) |  |  | $ | (1.03) |
From discontinued operations - basic |  | $ | (0.19) |  |  | $ | 0.12 |  |  | $ | (1.72) |  |  | $ | 0.36 |
From continuing operations - diluted |  | $ | (0.60) |  |  | $ | (0.35) |  |  | $ | (1.20) |  |  | $ | (1.03) |
From discontinued operations - diluted |  | $ | (0.19) |  |  | $ | 0.12 |  |  | $ | (1.72) |  |  | $ | 0.36 |
Net loss per share |  | $ | (0.79) |  |  | $ | (0.22) |  |  | $ | (2.91) |  |  | $ | (0.68) |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |
Basic and diluted |  | 17,351,005 |  |  | 17,264,157 |  |  | 17,337,428 |  |  | 17,241,469 |

See accompanying notes to condensed consolidated interim financial statements.
2

WESTPORT FUEL SYSTEMS INC.
Condensed Consolidated Interim Statements of Shareholders' Equity (unaudited)
(Expressed in thousands of United States dollars, except share amounts)
Three and nine months ended September 30, 2025 and 2024

|  | Common Shares Outstanding |  | Share capital |  | Other equity instruments |  | Additional paid in capital |  | Accumulated deficit |  | Accumulated other comprehensive loss |  | Total shareholders' equity
|  | Three months ended September 30, 2024
July 1, 2024 |  | 17,258,364 |  |  | $ | 1,245,651 |  |  | $ | 9,193 |  |  | $ | 11,516 |  |  | $ | (1,082,265) |  |  | $ | (32,570) |  |  | $ | 151,525 |
Issuance of common shares on exercise of share units |  | 6,500 |  |  | 61 |  |  | (61) |  |  | — |  |  | — |  |  | — |  |  | — |
Stock-based compensation |  | — |  |  | — |  |  | 267 |  |  | — |  |  | — |  |  | — |  |  | 267 |
Net loss for the period |  | — |  |  | — |  |  | — |  |  | — |  |  | (3,868) |  |  | — |  |  | (3,868) |
Other comprehensive income |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,368 |  |  | 1,368 |
September 30, 2024 |  | 17,264,864 |  |  | $ | 1,245,712 |  |  | $ | 9,399 |  |  | $ | 11,516 |  |  | $ | (1,086,133) |  |  | $ | (31,202) |  |  | $ | 149,292 |
|  | Nine months ended September 30, 2024
January 1, 2024 |  | 17,174,502 |  |  | $ | 1,244,539 |  |  | $ | 9,672 |  |  | $ | 11,516 |  |  | $ | (1,074,434) |  |  | $ | (30,845) |  |  | $ | 160,448 |
Issuance of common shares on exercise of share units |  | 90,362 |  |  | 1,173 |  |  | (1,173) |  |  | — |  |  | — |  |  | — |  |  | — |
Stock-based compensation |  | — |  |  | — |  |  | 900 |  |  | — |  |  | — |  |  | — |  |  | 900 |
Net loss for the period |  | — |  |  | — |  |  | — |  |  | — |  |  | (11,699) |  |  | — |  |  | (11,699) |
Other comprehensive income |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (357) |  |  | (357) |
September 30, 2024 |  | 17,264,864 |  |  | $ | 1,245,712 |  |  | $ | 9,399 |  |  | $ | 11,516 |  |  | $ | (1,086,133) |  |  | $ | (31,202) |  |  | $ | 149,292 |
|  | Three months ended September 30, 2025
July 1, 2025 |  | 17,351,005 |  |  | $ | 1,246,643 |  |  | $ | 9,027 |  |  | $ | 11,516 |  |  | $ | (1,133,070) |  |  | $ | (25,224) |  |  | $ | 108,892 |
Stock-based compensation |  | — |  |  | — |  |  | (16) |  |  | — |  |  | — |  |  | — |  |  | (16) |
Net loss for the period |  | — |  |  | — |  |  | — |  |  | — |  |  | (13,726) |  |  | — |  |  | (13,726) |
Other comprehensive loss |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (14,925) |  |  | (14,925) |
September 30, 2025 |  | 17,351,005 |  |  | $ | 1,246,643 |  |  | $ | 9,011 |  |  | $ | 11,516 |  |  | $ | (1,146,796) |  |  | $ | (40,149) |  |  | $ | 80,225 |
|  | Nine months ended September 30, 2025
January 1, 2025 |  | 17,282,934 |  |  | $ | 1,245,805 |  |  | $ | 9,472 |  |  | $ | 11,516 |  |  | $ | (1,096,275) |  |  | $ | (33,493) |  |  | $ | 137,025 |
Issuance of common shares on exercise of share units |  | 68,071 |  |  | 838 |  |  | (838) |  |  | — |  |  | — |  |  | — |  |  | — |
Stock-based compensation |  | — |  |  | — |  |  | 377 |  |  | — |  |  | — |  |  | — |  |  | 377 |
Net loss for the period |  | — |  |  | — |  |  | — |  |  | — |  |  | (50,521) |  |  | — |  |  | (50,521) |
Other comprehensive loss |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6,656) |  |  | (6,656) |
September 30, 2025 |  | 17,351,005 |  |  | $ | 1,246,643 |  |  | $ | 9,011 |  |  | $ | 11,516 |  |  | $ | (1,146,796) |  |  | $ | (40,149) |  |  | $ | 80,225 |

See accompanying notes to condensed consolidated interim financial statements.
3

WESTPORT FUEL SYSTEMS INC.
Condensed Consolidated Interim Statements of Cash Flows (unaudited)
(Expressed in thousands of United States dollars)
Three and nine months ended September 30, 2025 and 2024

|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Operating activities: |  |  |  |  |  |  |  |
Net loss for the period from continuing operations |  | $ | (10,410) |  |  | $ | (5,968) |  |  | $ | (20,758) |  |  | $ | (17,843) |
Adjustments to reconcile net income (loss) to net cash used in continuing operating activities:
Depreciation and amortization |  | 172 |  |  | 225 |  |  | 569 |  |  | 2,092 |
Stock-based compensation expense |  | 397 |  |  | 186 |  |  | 701 |  |  | 657 |
Unrealized foreign exchange loss (gain) |  | 1,282 |  |  | (1,709) |  |  | (4,145) |  |  | 86 |
Deferred income tax (recovery) |  | 9 |  |  | 8 |  |  | — |  |  | 28 |
Loss from investments accounted for by the equity method |  | 3,197 |  |  | 3,002 |  |  | 10,767 |  |  | 4,104 |
Interest on long-term debt |  | 22 |  |  | 19 |  |  | 67 |  |  | 53 |
Change in inventory write-downs |  | — |  |  | 203 |  |  | 110 |  |  | 706 |
Change in bad debt expense |  | — |  |  | 235 |  |  | — |  |  | 235 |
Gain on deconsolidation |  | — |  |  | — |  |  | — |  |  | (13,266) |
Loss on sale of investments |  | — |  |  | 352 |  |  | — |  |  | 352 |
Net cash used before working capital changes |  | (5,331) |  |  | (3,447) |  |  | (12,689) |  |  | (22,796) |
Changes in working capital |  | 864 |  |  | (8,242) |  |  | (6,005) |  |  | 8,899 |
Net cash used in operating activities of continuing operations |  | (4,467) |  |  | (11,689) |  |  | (18,694) |  |  | (13,897) |
Net cash provided by operating activities of discontinued operations |  | 5,057 |  |  | 1,757 |  |  | 8,182 |  |  | 5,606 |
Investing activities: |  |  |  |  |  |  |  |
Purchase of property, plant and equipment |  | (514) |  |  | (183) |  |  | (1,909) |  |  | (2,189) |
Proceeds from sale of investment |  | — |  |  | 9,564 |  |  | — |  |  | 28,437 |
Proceeds from sale of operations, net of cash in disposed operations (note 5) |  | 26,034 |  |  | — |  |  | 26,034 |  |  | — |
Proceeds from holdback receivable (note 6) |  | — |  |  | — |  |  | 10,450 |  |  | — |
Capital contributions to investments accounted for by the equity method |  | (10,997) |  |  | — |  |  | (19,868) |  |  | (9,900) |
Net cash provided by investing activities of continuing operations |  | 14,523 |  |  | 9,381 |  |  | 14,707 |  |  | 16,348 |
Net cash used in investing activities of discontinued operations |  | (222) |  |  | (1,919) |  |  | (3,169) |  |  | (7,820) |
Financing activities: |  |  |  |  |  |  |  |
Repayments of operating lines of credit and long-term facilities |  | (6,832) |  |  | (4,395) |  |  | (8,832) |  |  | (33,438) |
Drawings on operating lines of credit and long-term facilities |  | 5,839 |  |  | — |  |  | 5,839 |  |  | 15,550 |
Net cash used in financing activities of continuing operations |  | (993) |  |  | (4,395) |  |  | (2,993) |  |  | (17,888) |
Net cash used in financing activities of discontinued operations |  | (74) |  |  | (2,570) |  |  | (6,168) |  |  | (3,818) |
Effect of foreign exchange on cash and cash equivalents |  | (2,111) |  |  | 1,170 |  |  | 3,585 |  |  | (127) |
Net increase (decrease) in cash and cash equivalents |  | 11,713 |  |  | (8,265) |  |  | (4,550) |  |  | (21,596) |
Cash and cash equivalents, beginning of period (including restricted cash) |  | 21,383 |  |  | 41,522 |  |  | 37,646 |  |  | 54,853 |
Cash and cash equivalents, end of period (including restricted cash) |  | $ | 33,096 |  |  | $ | 33,257 |  |  | $ | 33,096 |  |  | $ | 33,257 |
Less: cash and cash equivalents from discontinued operations, end of period (including restricted cash) |  | $ | — |  |  | $ | 20,480 |  |  | $ | — |  |  | $ | 20,480 |
Cash and cash equivalents from continuing operations, end of period (including restricted cash) |  | $ | 33,096 |  |  | $ | 12,777 |  |  | $ | 33,096 |  |  | $ | 12,777 |

4

WESTPORT FUEL SYSTEMS INC.
Condensed Consolidated Interim Statements of Cash Flows (unaudited)
(Expressed in thousands of United States dollars)
Three and nine months ended September 30, 2025 and 2024

Supplementary information |  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Interest paid |  | $ | 187 |  |  | $ | 585 |  |  | $ | 1,369 |  |  | $ | 2,297 |
Taxes paid, net of refunds |  | 492 |  |  | 947 |  |  | 1,899 |  |  | 1,496 |
Changes in working capital: |  |  |  |  |  |  |  |
Accounts receivable |  | 2,331 |  |  | (293) |  |  | (5,993) |  |  | 16,370 |
Inventories |  | 1,437 |  |  | (5,257) |  |  | 5,207 |  |  | 694 |
Prepaid expenses |  | (304) |  |  | 2,509 |  |  | 616 |  |  | 2,666 |
Accounts payable and accrued liabilities |  | (2,671) |  |  | (5,363) |  |  | (5,911) |  |  | (9,895) |
Warranty liability |  | 71 |  |  | 162 |  |  | 76 |  |  | (936) |
|  | 864 |  |  | (8,242) |  |  | (6,005) |  |  | 8,899 |

See accompanying notes to condensed consolidated interim financial statements.
5

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

1. Company organization and operations:
Westport Fuel Systems Inc. (the “Company” or "Westport") was incorporated under the Business Corporations Act (Alberta) on March 20, 1995. Westport is a technology and innovation company. As a supplier of alternative fuel, low-emissions transportation technologies, Westport designs, manufactures, and supplies components and systems that enable the transition from traditional fuels to cleaner energy solutions for heavy-duty commercial vehicles and other on- and off-road applications. The Company has a 55% ownership in Cespira, a joint venture with Volvo Group ("Volvo") formed in 2024. Cespira is committed to advancing the development and commercialization of the HPDI™ fuel system, a fully OEM-integrated gaseous fuel systems that enables heavy-duty diesel engines to operate with a range of clean-burning fuels including natural gas, renewable natural gas ("RNG"), hydrogen ("H2") and other alternative fuels. Westport supplies its products directly to original equipment manufacturers (“OEMs”) and Tier 1 and Tier 2 OEM suppliers.
2. Liquidity and going concern:
For the nine months ended September 30, 2025, the Company reported operating losses of $10,498. Cash used in continuing operating activities was $18,694 for the nine months ended September 30, 2025 and was primarily driven by operating losses and decreases in working capital. The Company continues to use cash to support its business activities and support the growth of Cespira. As at September 30, 2025, the Company had cash and cash equivalents of $33,096 in continuing operations and long-term debt borrowed from Export Development Canada ("EDC") of $3,903, net of deferred financing fees, of which all is current. Under the term loan with EDC, the Company has a cash covenant with a consolidated cash requirement of $15,000. If the Company's cash and cash equivalents fall below the minimum cash requirement, the Company may be required to repay the outstanding amount of the term loan.
On July 29, 2025, the Company closed the sale of the Light-Duty segment to a wholly-owned investment vehicle of Heliaca Investments ("Purchaser"), a Netherlands based investment firm supported by Ramphastos Investments Management B.V., a prominent Dutch venture capital and private equity firm for total consideration of $59,975 (€51,424) (note 5).
On September 29, 2025, the Company filed a final short form base shelf prospectus (the "Shelf Prospectus") with the relevant Canadian securities regulatory authorities allowing the Company to offer up to USD $100,000 of common shares, preferred shares, subscription receipts, warrants, debt securities, or units, or any combination thereof during the 25-month period that the Shelf Prospectus will be effective.
In connection with preparing consolidated financial statements for each annual and interim reporting period, the Company is required to evaluate whether there are conditions or events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the consolidated financial statements are issued. Substantial doubt exists when conditions and events, considered in aggregate, indicate that it is probable a company will be unable to meet its obligations as they become due within one year after the date the consolidated financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans and actions that have not been fully implemented as of the date the consolidated financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both: (1) it is probable the plans will be effectively implemented within one year after the date the consolidated financial statements are issued; and (2) it is probable the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the consolidated financial statements are issued.
6

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

2. Liquidity and going concern (continued):
Based on the Company's projected capital expenditures, debt servicing obligations and operating requirements under its current business plan, management is projecting that its existing cash and cash equivalents will not be sufficient to fund its operations through the next twelve months from the date of the issuance of these condensed consolidated interim financial statements ("interim financial statements"). These conditions raise substantial doubt about the Company's ability to continue as a going concern within one year after the date these interim financial statements are issued.
Management is currently evaluating several different options to improve Westport's liquidity position, including raising funds from the public markets, borrowing debt or other financing alternatives. These plans are not final and are subject to market and other conditions not in the Company's control. As such, there can be no assurances that Westport will be successful in obtaining sufficient funding. Accordingly, the Company concluded under the accounting standards that these plans do not alleviate the substantial doubt about Westport's ability to continue as a going concern.
These interim financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the ordinary course of business. The interim financial statements do not include any adjustments related to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that may be necessary if the Company were unable to continue as a going concern.
3. Basis of preparation:
(a) Basis of presentation:
The interim financial statements have been prepared by the Company and do not include all of the information and disclosures required by accounting principles generally accepted in the United States ("GAAP"). In the opinion of management, all normal recurring accruals and adjustments considered necessary for a fair presentation have been included. The results for the three and nine months ended September 30, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025. The interim financial statements should be read in conjunction with the audited consolidated financial statements and notes to the consolidated financial statements for the year ended December 31, 2024.
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the interim financial statements and accompanying notes. Actual results could differ from those estimates. Certain prior period figures have been adjusted to conform to current period presentation in the interim financial statements.
(b) Foreign currency translation:
The Company’s functional currency is the Canadian dollar and its reporting currency for its interim financial statement presentation is the United States dollar ("U.S. Dollar"). The functional currencies for the Company's significant subsidiaries include the following: U.S. Dollar, Canadian dollar, Euro, and Chinese Renminbi (“RMB”). The Company translates assets and liabilities of non-U.S. dollar functional currency operations using the period end exchange rates, shareholders’ equity balances using the weighted average of historical exchange rates, and revenues and expenses using the monthly average rate for the period with the resulting exchange differences recognized in other comprehensive income (loss).
7

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

3. Basis of preparation (continued):
Transactions that are denominated in currencies other than the functional currencies of the Company’s or its subsidiaries' operations are translated at the rates in effect on the date of the transaction. Foreign currency denominated monetary assets and liabilities are translated to the applicable functional currency at the exchange rates in effect on the balance sheet date. Non-monetary assets and liabilities are translated at the historical exchange rate. All foreign exchange gains and losses are recognized in the condensed consolidated interim statements of operations, except for the translation gains and losses arising from available-for-sale instruments, which are recorded through other comprehensive income (loss) until realized through disposal or impairment.
Except as otherwise noted, all amounts in these interim financial statements are presented in thousands of U.S. dollars. For the periods presented, the Company used the following exchange rates:

| Period ended |  | Average for the three months ended |  | Average for the nine months ended
| September 30, 2025 |  | December 31, 2024 |  | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 30, 2024
Canadian Dollar | 1.39 |  |  | 1.44 |  |  | 1.38 |  |  | 1.36 |  |  | 1.40 |  |  | 1.36 |
Euro | 0.85 |  |  | 0.96 |  |  | 0.86 |  |  | 0.91 |  |  | 0.89 |  |  | 0.92 |
RMB | 7.12 |  |  | 7.30 |  |  | 7.16 |  |  | 7.16 |  |  | 7.22 |  |  | 7.20 |

(c) Held-for-sale disposal group and discontinued operations:
The Company classifies a component of an entity as a held-for-sale disposal group when it has been disposed of during the period, or it has met all of the held-for-sale criteria under Topic 205 - Presentation of Financial Statements at the balance sheet reporting date. Held-for-sale disposal groups are measured at the lower of its carrying amount and fair value less cost to sell. If the fair value less cost to sell is lower than its carrying amount, a loss is recognized to write down the carrying amount of the disposal group as a whole.
After a disposal group has been classified as held-for-sale, management may decide to reverse its plan to divest, or circumstances may change so that the disposal group no longer meets the held-for-sale criteria. In such instances, the Company would reclassify the disposal group's assets and liabilities on the balance sheet as held-and-used and remeasure the assets on the date of reclassification.
A component that has been disposed of or is held-for-sale is reported in discontinued operations if its disposition represents a strategic shift and has (or will have) a major effect on the entity's operations and financial results. Discontinued operations are reported separately from the Company's continuing operations on the balance sheet, statement of operations and comprehensive income (loss), and statement of cash flows. For comparative purposes, the Company adjusted the prior periods presented in the interim financial statements to reflect the effect of operations discontinued in the current period. The Company's interim financial statements eliminated its intercompany balances with its discontinued operations as the intercompany balances will be settled upon disposal.
8

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

4. New accounting pronouncements
Upcoming accounting standards not yet adopted:
In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements in Income Tax Disclosures" to enhance the transparency and decision usefulness of income tax disclosures. This amendment requires public companies to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. Additionally, under the amendment entities are required to disclose the amount of income taxes paid disaggregated by federal, state and foreign taxes, as well as disaggregated by material individual jurisdictions. Finally, the amendment requires entities to disclose income from continuing operations before income tax expense disaggregated between domestic and foreign and income tax expense from continuing operations disaggregated by federal, state and foreign. This guidance is effective for annual reporting periods beginning after December 15, 2024. The Company has the option to elect to adopt this ASU (a) prospectively by providing the revised disclosures for the period ending December 31, 2025 and continuing to provide the pre-ASU disclosures for the prior periods; or (b) retrospectively by providing the revised disclosures for all periods presented. The Company is assessing the impact of this ASU and expects it to impact disclosures with no impact to its financial position, operations, and cash flows.
In November 2024, the FASB issued ASU 2024-03, "Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses." It requires entities to disclose, in the notes to the financial statements, specified information related to certain costs and expenses disaggregated by type. The standard improves transparency by providing more detailed information about the component of costs and expenses that would enable users to better understand the major components of an entity's income statement by referencing disclosures in the notes to financial statements. This guidance is effective for annual reporting periods beginning after December 15, 2026. While this guidance may have an impact on the disclosures, the Company does not expect this guidance to have a material impact on its financial position, operations, and cash flows.
5. Discontinued operations:
On May 15, 2025, shareholders approved management's plan to sell the Light-Duty segment in accordance with the terms of the sale and purchase agreement ("SPA") dated March 30, 2025.
On July 14, 2025, the Company entered into a short-term loan with the Purchaser for $5,839 (€5,000). The loan was subsequently repaid on July 29, 2025.
On July 29, 2025, the Company closed the sale of its Light-Duty segment to the Purchaser for consideration of $59,975 (€51,424). The Company recorded a $35,268 loss on disposal of the operations in respect of the sale. In the current quarter, the Company received proceeds of $47,146 (€40,424) from the Purchaser in cash and other consideration. The Company expects to receive a further $12,829 (€11,000) from proceeds held in escrow, which are included within a holdback receivable (note 6) and other long-term assets. The proceeds held in escrow will be released to the Company in four tranches by year-end 2025, early 2026, early 2027 and mid-year 2027. Purchase price adjustments may impact the final proceeds received from the Purchaser pending satisfaction of certain general representations and warranties provided by the Company that are customary in nature. Subsequent to quarter-end, the Company received $3,519 (€3,000) from escrow ahead of the year-end 2025 deadline.
Further, up to $3,790 (€3,250) in potential earnouts will be payable to the Company if certain conditions are achieved in accordance with the terms and conditions of the sale and purchase agreement.
9

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

5. Discontinued operations (continued):
Major assets and liabilities of the discontinued operations were as follows:

|  | July 29, 2025 |  | December 31, 2024
Cash |  | $ | 21,112 |  |  | $ | 22,892 |
Accounts receivable |  | 58,874 |  |  | 54,316 |
Inventories |  | 55,991 |  |  | 46,858 |
Prepaid expenses |  | 14,610 |  |  | 4,332 |
|  | 150,587 |  |  | 128,398 |
Long-term investments |  | 3,454 |  |  | 2,866 |
Property, plant, and equipment |  | 43,798 |  |  | 38,836 |
Operating lease right-of-use asset |  | 20,964 |  |  | 18,196 |
Intangible assets |  | 5,054 |  |  | 5,184 |
Deferred income tax assets |  | 9,990 |  |  | 9,695 |
Goodwill |  | 2,957 |  |  | 2,876 |
Other long-term assets |  | 1,990 |  |  | 1,842 |
|  | 88,207 |  |  | 79,495 |
Total assets classified as held for sale |  | $ | 238,794 |  |  | $ | 207,893 |
Accounts payable and accrued liabilities |  | $ | 84,405 |  |  | $ | 68,688 |
Current portion of operating lease liabilities |  | 2,414 |  |  | 2,336 |
Current portion of long-term debt |  | 11,067 |  |  | 10,755 |
Current portion of warranty liabilities |  | 3,329 |  |  | 2,709 |
|  | 101,215 |  |  | 84,488 |
Long-term operating lease liabilities |  | 18,691 |  |  | 15,885 |
Long-term debt |  | 13,513 |  |  | 16,135 |
Warranty liabilities |  | 1,874 |  |  | 1,456 |
Deferred income tax liabilities |  | 1,971 |  |  | 4,029 |
Other long-term liabilities |  | 3,032 |  |  | 2,955 |
|  | 39,081 |  |  | 40,460 |
Total liabilities classified as held for sale |  | $ | 140,296 |  |  | $ | 124,948 |

10

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

5. Discontinued operations (continued):
Three months ended September 30, 2025 only included activity prior to the disposal of the operations. Revenue and expenses of the discontinued operation were as follows:

|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Revenue |  | $ | 20,000 |  |  | $ | 61,374 |  |  | $ | 160,004 |  |  | $ | 193,798 |
Cost of revenue |  | 15,701 |  |  | 47,571 |  |  | 126,861 |  |  | 152,966 |
Gross profit |  | 4,299 |  |  | 13,803 |  |  | 33,143 |  |  | 40,832 |
Operating expenses: |  |  |  |  |  |  |  |
Research and development |  | 1,025 |  |  | 2,638 |  |  | 6,763 |  |  | 9,081 |
General and administrative |  | 832 |  |  | 4,290 |  |  | 8,313 |  |  | 13,331 |
Sales and marketing |  | 837 |  |  | 2,404 |  |  | 6,006 |  |  | 7,048 |
Foreign exchange (gain) loss |  | (443) |  |  | 640 |  |  | 2,166 |  |  | 723 |
Depreciation and amortization |  | 230 |  |  | 647 |  |  | 1,509 |  |  | 1,954 |
|  | 2,481 |  |  | 10,619 |  |  | 24,757 |  |  | 32,137 |
Income from discontinued operations |  | 1,818 |  |  | 3,184 |  |  | 8,386 |  |  | 8,695 |
Income from investment accounted for by the equity method |  | 119 |  |  | 221 |  |  | 591 |  |  | 666 |
Loss on disposal of operations |  | (5,085) |  |  | — |  |  | (35,268) |  |  | — |
Impairment of long-lived assets |  | — |  |  | — |  |  | (664) |  |  | — |
Interest on long-term debt |  | (55) |  |  | (663) |  |  | (930) |  |  | (1,266) |
Interest and other income, net of bank charges |  | 76 |  |  | 354 |  |  | 429 |  |  | 525 |
Income (loss) from discontinued operations before income tax |  | (3,127) |  |  | 3,096 |  |  | (27,456) |  |  | 8,620 |
Income tax expense |  | 189 |  |  | 996 |  |  | 2,307 |  |  | 2,476 |
Net income (loss) from discontinued operations |  | $ | (3,316) |  |  | $ | 2,100 |  |  | $ | (29,763) |  |  | $ | 6,144 |

11

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

6. Accounts receivable:

|  | September 30, 2025 |  | December 31, 2024
Customer trade receivables |  | $ | 1,707 |  |  | $ | 2,513 |
Holdback receivable |  | 9,326 |  |  | 10,737 |
Other receivables |  | 2,485 |  |  | 887 |
Due from related parties (note 13) |  | 241 |  |  | 4,973 |
Allowance for expected credit losses |  | (565) |  |  | (372) |
|  | $ | 13,194 |  |  | $ | 18,738 |

In 2022, a holdback receivable was recorded as part of the sale of the Company's interest in Cummins Westport Inc. to Cummins Inc. ("Cummins"). The holdback was retained by Cummins for a term of three years to satisfy any extended warranty obligations in excess of the recorded extended warranty obligation. Unused amounts were repaid to the Company at the end of the three-year term. In March 2025, the Company collected $11,365 from Cummins related to the holdback receivable, including interest accrued.
A holdback receivable was recorded as part of the sale of the Light-Duty segment. The holdback is consideration held in escrow pending satisfaction of certain general representations and warranties provided to the Purchaser. The Company provided for estimated losses on the holdback receivable in loss on disposal of operations.
7. Inventories:

|  | September 30, 2025 |  | December 31, 2024
Purchased parts |  | $ | 2,767 |  |  | $ | 5,463 |
Finished goods |  | 630 |  |  | 1,205 |
|  | $ | 3,397 |  |  | $ | 6,668 |

During the three and nine months ended September 30, 2025, the Company recorded change in write-downs to net realizable value of $0 and $110, respectively (three and nine months ended September 30, 2024 - $203 and $706, respectively).
8. Long-term investments:

|  | September 30, 2025 |  | December 31, 2024
Cespira Canada LP |  | $ | 23,846 |  |  | $ | 25,494 |
Cespira Sweden AB |  | 20,275 |  |  | 11,225 |
Other equity-accounted investees |  | — |  |  | 147 |
|  | $ | 44,121 |  |  | $ | 36,866 |

During the three and nine months ended September 30, 2025, the Company recognized its share of Cespira's losses of $3,197 and $10,767 as a loss from investment accounted for by the equity method, respectively (three and nine months ended September 30, 2024 - $3,002 and $4,104, respectively).
During the three and nine months ended September 30, 2025, the Company contributed additional capital of $10,997 and $19,868 into Cespira, respectively (three and nine months ended September 30, 2024 - $0 and $9,900, respectively).
12

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

8. Long-term investments (continued):
Combined assets, liabilities, revenue and expenses of Cespira, are as follows:

|  | September 30, |  | December 31,
|  | 2025 |  | 2024
Current assets: |  |  |  |
Cash and cash equivalents |  | $ | 7,620 |  |  | $ | 10,305 |
Accounts receivable |  | 26,799 |  |  | 21,000 |
Inventories |  | 18,837 |  |  | 7,414 |
Prepaid expenses |  | 2,911 |  |  | 1,471 |
|  | 56,167 |  |  | 40,190 |
Property, plant and equipment |  | 41,787 |  |  | 40,901 |
Intangible assets |  | 6,944 |  |  | 7,087 |
Other long-term assets |  | $ | 771 |  |  | $ | 563 |
Total assets |  | $ | 105,669 |  |  | $ | 88,741 |
Current liabilities: |  |  |  |
Accounts payable |  | $ | 12,750 |  |  | $ | 16,527 |
Current portion of provisions |  | 1,697 |  |  | 2,128 |
Other current liabilities |  | 2,149 |  |  | 1,910 |
|  | 16,596 |  |  | 20,565 |
Long-term portion of provisions |  | 424 |  |  | 532 |
Other long-term liabilities |  | 1,231 |  |  | 569 |
Total liabilities |  | $ | 18,251 |  |  | $ | 21,666 |
Net assets |  | $ | 87,418 |  |  | $ | 67,075 |

|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Revenue |  | $ | 19,328 |  |  | $ | 16,209 |  |  | $ | 48,147 |  |  | $ | 20,268 |
Cost of revenue |  | 20,364 |  |  | 16,374 |  |  | 50,594 |  |  | 20,275 |
Gross profit |  | (1,036) |  |  | (165) |  |  | (2,447) |  |  | (7) |
Operating expenses: |  |
Research and development |  | 1,135 |  |  | 1,830 |  |  | 6,025 |  |  | 2,951 |
General and administrative |  | 2,410 |  |  | 1,943 |  |  | 7,829 |  |  | 2,658 |
Sales and marketing |  | 357 |  |  | 335 |  |  | 975 |  |  | 404 |
Foreign exchange gain |  | 147 |  |  | 127 |  |  | 59 |  |  | 279 |
Depreciation and amortization |  | 833 |  |  | 944 |  |  | 2,423 |  |  | 1,209 |
|  | 4,882 |  |  | 5,179 |  |  | 17,311 |  |  | 7,501 |
Loss from operations |  | (5,918) |  |  | (5,344) |  |  | (19,758) |  |  | (7,508) |
Interest income (expense), net of bank charges |  | (71) |  |  | 117 |  |  | (39) |  |  | 117 |
Loss before income taxes |  | (5,989) |  |  | (5,227) |  |  | (19,797) |  |  | (7,391) |
Income tax (recovery) expense |  | 45 |  |  | 11 |  |  | (19) |  |  | 15 |
Net loss |  | $ | (6,034) |  |  | $ | (5,238) |  |  | $ | (19,778) |  |  | $ | (7,406) |

13

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

9. Property, plant and equipment:

|  |  |  | Accumulated |  | Net Book
September 30, 2025 |  | Cost |  | Depreciation |  | Value
Computer equipment and software |  | 3,481 |  |  | 2,796 |  |  | 685 |
Furniture and fixtures |  | 91 |  |  | 88 |  |  | 3 |
Machinery and equipment |  | 12,828 |  |  | 8,800 |  |  | 4,028 |
Leasehold improvements |  | 4,368 |  |  | 4,021 |  |  | 347 |
|  | $ | 20,768 |  |  | $ | 15,705 |  |  | $ | 5,063 |

|  |  |  | Accumulated |  | Net Book
December 31, 2024 |  | Cost |  | Depreciation |  | Value
Computer equipment and software |  | 2,945 |  |  | 2,575 |  |  | 370 |
Furniture and fixtures |  | 86 |  |  | 85 |  |  | 1 |
Machinery and equipment |  | 10,239 |  |  | 7,713 |  |  | 2,526 |
Leasehold improvements |  | 4,064 |  |  | 3,841 |  |  | 223 |
|  | $ | 17,334 |  |  | $ | 14,214 |  |  | $ | 3,120 |

10. Accounts payable and accrued liabilities:

|  | September 30, 2025 |  | December 31, 2024
Trade accounts payable |  | $ | 8,671 |  |  | $ | 11,397 |
Accrued payroll |  | 2,417 |  |  | 2,555 |
Taxes payable |  | 3,805 |  |  | 3,813 |
Deferred revenue |  | 496 |  |  | 533 |
Due to related parties (note 13) |  | 161 |  |  | 1,137 |
|  | $ | 15,550 |  |  | $ | 19,435 |

11. Long-term debt:

Term loan facility | Maturity date | Interest rate | September 30, 2025 |  | December 31, 2024
EDC | September 15, 2026 | U.S. Prime Rate plus 2.01% | $ | 3,903 |  |  | $ | 6,837 |
Current portion |  |  | 3,903 |  |  | 3,905 |
Long-term portion |  |  | — |  |  | 2,932 |
Term loan facilities, net of debt issuance costs |  | $ | 3,903 |  |  | $ | 6,837 |

On December 13, 2021, the credit facility and non-revolving term facility with EDC were refinanced into one $20,000 term loan, with quarterly principal and interest payments. On May 31, 2024, the Company amended the loan agreement with EDC to permit the asset transfer of certain property, plant, and equipment previously pledged to the loan into Cespira, removal of Fuel System Solutions Inc. as a borrower, added Westport Fuel Systems Canada Inc. as a borrower and modified the securities pledged to the loan. The loan is secured by share pledges in the Company's equity interest in Cespira.
14

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

11. Long-term debt (continued):
Throughout the term of certain of these financing arrangements, the Company is required to meet certain financial and non-financial covenants. As at September 30, 2025, the Company is in compliance with all covenants under the financing arrangements.
The principal repayment schedule of long-term debt is as follows as at September 30, 2025:

|  | Term loan facility |  |  |  |  |  |  |  |  |  |
Remainder of 2025 |  | $ | 976 |  |  |  |  |  |  |  |  |  |  |
2026 |  | 2,927 |  |  |  |  |  |  |  |  |  |  |
|  | $ | 3,903 |  |  |  |  |  |  |  |  |  |  |

12. Share capital, stock options and other stock-based plans:
During the three and nine months ended September 30, 2025, the Company issued nil and 68,071 common shares, respectively, net of cancellations, upon exercises of share units (three and nine months ended September 30, 2024 – 6,500 and 90,362 common shares, respectively). The Company issues shares from treasury to satisfy share unit exercises.
(a) Share Units (“Units”):
The value assigned to issued Units and the amounts accrued are recorded as other equity instruments. As Units are exercised or vest and the underlying shares are issued from treasury of the Company, the value is reclassified to share capital.
During the three and nine months ended September 30, 2025, the Company recognized $221 and $515, respectively (three and nine months ended September 30, 2024 - $140 and $1,352, respectively) of stock-based compensation associated with the Westport Omnibus Plan. The Westport Omnibus Plan aims to advance the Company's interests by encouraging employees, consultants and non-employee directors to receive equity-based compensation and incentives. The plan outlines the stock-based options types, eligibility and vesting terms.
A continuity of the Units issued under the Westport Omnibus Plan are as follows:

|  | Nine months ended September 30, 2025 |  | Nine months ended September 30, 2024
|  | Number of Units |  | Weighted average grant date fair value (CDN $) |  | Number of Units |  | Weighted average grant date fair value (CDN $)
Outstanding, beginning of period |  | 524,322 |  |  | $ | 11.75 |  |  | 478,643 |  |  | $ | 15.68 |
Granted |  | 427,691 |  |  | 3.28 |  |  | 224,050 |  |  | 8.23 |
Exercised |  | (68,071) |  |  | 17.48 |  |  | (90,362) |  |  | 17.58 |
Forfeited/expired |  | (146,457) |  |  | 11.82 |  |  | (54,614) |  |  | 22.15 |
Outstanding, end of period |  | 737,485 |  |  | $ | 6.28 |  |  | 557,717 |  |  | $ | 11.73 |
Units outstanding and exercisable, end of period |  | 491 |  |  | $ | 31.07 |  |  | — |  |  | $ | — |

15

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

12. Share capital, stock options and other stock-based plans (continued):
During the nine months ended September 30, 2025, 427,691 share units were granted to certain employees and directors (nine months ended September 30, 2024 - 224,050). This included nil restricted share units (“RSUs”) (nine months ended September 30, 2024 - 104,215), 290,540 performance share units (“PSUs”) (nine months ended September 30, 2024 - nil) and 137,151 deferred share units ("DSUs") (nine months ended September 30, 2024 - 119,835).
Values of PSUs are determined using the Monte–Carlo Simulation Model. RSUs typically vest over a three-year period so the actual value received by the individual depends on the share price on the day such RSUs are settled for common shares, not the date of grant. Vesting of DSUs shall occur immediately prior to the resignation, retirement or termination of directorship, in accordance with the terms of Westport's Omnibus Plan.
As at September 30, 2025, $540 of compensation expense related to Units awarded has yet to be recognized in results from operations and will be recognized ratably over 1.6 years.
(b) Aggregate intrinsic values:
The aggregate intrinsic value of the Company’s share units at September 30, 2025 as follows:

|  | September 30, 2025
|  | (CDN $)
Share units: |  |
Outstanding |  | $ | 2,358 |
Exercisable |  | 15 |
Exercised |  | 218 |

(c) Stock-based compensation:
Stock-based compensation associated with the Unit plans is included in operating expenses as follows:

|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of revenue |  | $ | — |  |  | $ | 36 |  |  | $ | — |  |  | $ | 113 |
Research and development |  | 12 |  |  | 53 |  |  | 40 |  |  | 216 |
General and administrative |  | (215) |  |  | (269) |  |  | 465 |  |  | 875 |
Sales and marketing |  | (18) |  |  | 40 |  |  | 10 |  |  | 148 |
|  | $ | (221) |  |  | $ | (140) |  |  | $ | 515 |  |  | $ | 1,352 |

Of the stock-based compensation expense recognized in the three and nine months ended September 30, 2025, a recovery of $(16) and $377 will settle in shares and a recovery of $(205) and $138 will settle in cash, respectively (three and nine months ended September 30, 2024 - $267 and $900 will settle in shares and a recovery of $(407) and $452 will settle in cash, respectively).
16

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

13. Related party transactions:
The Company's related parties are Cespira, directors, officers and shareholders that own more than 10% of the Company's shares.
The Company engages in transactions with Cespira primarily through cross charges, the provision of services and the sale of inventory under a transitional services agreement that ended on June 30, 2025.

Related party transactions with Cespira | Three months ended September 30, |  | Nine months ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Sales of goods, services, and other income | $ | 136 |  |  | $ | 2,677 |  |  | $ | 15,679 |  |  | $ | 3,338 |
Inventory purchased, services and other expenses | 226 |  |  | — |  |  | 1,470 |  |  | — |

Related party balances with Cespira | September 30, 2025 |  | December 31, 2024
Receivables (note 6) | $ | 241 |  |  | $ | 4,973 |
Payables (note 10) | $ | 161 |  |  | $ | 1,137 |

14. Commitments and contingencies:
(a) Contractual commitments
The Company is a party to a variety of agreements in the ordinary course of business under which it is obligated to indemnify a third party with respect to certain matters. Typically, these obligations arise as a result of contracts for sale of the Company’s product to customers where the Company provides indemnification against losses arising from matters such as product liabilities. The potential impact on the Company’s financial results is not subject to reasonable estimation because considerable uncertainty exists as to whether claims will be made and the final outcome of potential claims. To date, the Company has not incurred significant costs related to these types of indemnifications.
(b) Contingencies
The Company is engaged in certain legal actions and tax audits in the ordinary course of business and believes that, based on the information currently available, the ultimate outcome of these actions will not have a material adverse effect on our operating results, liquidity or financial position.
17

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

15. Segment information:
As a result of the classification of the Light-Duty segment as discontinued operations (note 5), the Company reports its results in the following three reportable segments: High-Pressure Controls & Systems, Heavy-Duty OEM, and Cespira. The prior year comparatives were recast to reflect this change in reportable segments.
Segment earnings or losses before income taxes, interest, depreciation, and amortization ("Segment EBITDA") is the measure of segment profitability used by the Company. The accounting policies of our reportable segments are the same as those applied in our consolidated financial statements. Management prepared the financial results of the Company's reportable segments on basis that is consistent with the manner in which Management internally disaggregates financial information to assist in making internal operating decisions. Certain common costs and expenses were allocated among segments and presented differently than the Company would for stand-alone financial information prepared in accordance with GAAP. These include certain costs and expenses of shared services, such as IT, human resources, legal, finance and supply chain management. Segment EBITDA is not defined under US GAAP and may not be comparable to similarly titled measures used by other companies and should not be considered a substitute for net earnings or other results reported in accordance with GAAP.
The Company's Chief Operating Decision Maker ("CODM") uses Segment EBITDA disclosed below to evaluate the performance of its reportable segments. The Company believes Segment EBITDA is most reflective of the operational profitability or loss of its reportable segments. The CODM uses this information to drive decisions and resource allocations. Segment EBITDA is used as the key profitability measure when the Company sets its annual budget.
18

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

15. Segment information (continued):
Financial information by reportable segment as follows:

|  |  | Three months ended September 30, 2025
|  |  | High-Pressure Controls & Systems |  | Heavy-Duty OEM |  |  |  | Cespira |  | Total Segment
Revenue |  |  | $ | 1,606 |  |  | $ | 11 |  |  |  |  | $ | 19,328 |  |  | $ | 20,945 |
Cost of revenue |  |  | 1,145 |  |  | — |  |  |  |  | 20,364 |  |  | 21,509 |
Gross profit |  |  | 461 |  |  | 11 |  |  |  |  | (1,036) |  |  | (564) |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | 2,293 |  |  | 26 |  |  |  |  | 1,135 |  |  | 3,454 |
General and administrative |  |  | 484 |  |  | 34 |  |  |  |  | 2,410 |  |  | 2,928 |
Sales and marketing |  |  | 103 |  |  | 3 |  |  |  |  | 357 |  |  | 463 |
Depreciation and amortization |  |  | 108 |  |  | — |  |  |  |  | 833 |  |  | 941 |
|  |  | 2,988 |  |  | 63 |  |  |  |  | 4,735 |  |  | 7,786 |
Add back: Depreciation and amortization 1 |  |  | 143 |  |  | — |  |  |  |  | 1,610 |  |  | 1,753 |
Segment EBITDA |  |  | $ | (2,384) |  |  | $ | (52) |  |  |  |  | $ | (4,161) |  |  | $ | (6,597) |

|  |  | Three months ended September 30, 2024
|  |  | High-Pressure Controls & Systems |  | Heavy-Duty OEM |  |  |  | Cespira |  | Total Segment
Revenue |  |  | $ | 1,764 |  |  | $ | 3,113 |  |  |  |  | $ | 16,209 |  |  | $ | 21,086 |
Cost of revenue |  |  | 1,352 |  |  | 2,862 |  |  |  |  | 16,374 |  |  | 20,588 |
Gross profit |  |  | 412 |  |  | 251 |  |  |  |  | (165) |  |  | 498 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | 1,257 |  |  | (629) |  |  |  |  | 1,830 |  |  | 2,458 |
General and administrative |  |  | 292 |  |  | 55 |  |  |  |  | 1,943 |  |  | 2,290 |
Sales and marketing |  |  | 44 |  |  | 36 |  |  |  |  | 335 |  |  | 415 |
Depreciation and amortization |  |  | 27 |  |  | 4 |  |  |  |  | 944 |  |  | 975 |
|  |  | 1,620 |  |  | (534) |  |  |  |  | 5,052 |  |  | 6,138 |
Add back: Depreciation and amortization 1 |  |  | 145 |  |  | 8 |  |  |  |  | 1,106 |  |  | 1,259 |
Segment EBITDA |  |  | $ | (1,063) |  |  | $ | 793 |  |  |  |  | $ | (4,111) |  |  | $ | (4,381) |

19

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

15. Segment information (continued):

|  |  | Nine months ended September 30, 2025
|  |  | High-Pressure Controls & Systems |  | Heavy-Duty OEM |  |  |  | Cespira |  | Total Segment
Revenue |  |  | $ | 6,392 |  |  | $ | 15,046 |  |  |  |  | $ | 48,147 |  |  | $ | 69,585 |
Cost of revenue |  |  | 5,313 |  |  | 13,276 |  |  |  |  | 50,594 |  |  | 69,183 |
Gross profit |  |  | 1,079 |  |  | 1,770 |  |  |  |  | (2,447) |  |  | 402 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | 5,027 |  |  | 159 |  |  |  |  | 6,025 |  |  | 11,211 |
General and administrative |  |  | 1,189 |  |  | 133 |  |  |  |  | 7,829 |  |  | 9,151 |
Sales and marketing |  |  | 253 |  |  | 26 |  |  |  |  | 975 |  |  | 1,254 |
Depreciation and amortization |  |  | 223 |  |  | — |  |  |  |  | 2,423 |  |  | 2,646 |
|  |  | 6,692 |  |  | 318 |  |  |  |  | 17,252 |  |  | 24,262 |
Add back: Depreciation and amortization 1 |  |  | 432 |  |  | — |  |  |  |  | 4,901 |  |  | 5,333 |
Segment EBITDA |  |  | $ | (5,181) |  |  | $ | 1,452 |  |  |  |  | $ | (14,798) |  |  | $ | (18,527) |

|  |  | Nine months ended September 30, 2024
|  |  | High-Pressure Controls & Systems |  | Heavy-Duty OEM |  |  |  | Cespira |  | Total Segment
Revenue |  |  | $ | 7,813 |  |  | $ | 25,601 |  |  |  |  | $ | 20,268 |  |  | $ | 53,682 |
Cost of revenue |  |  | 5,766 |  |  | 25,168 |  |  |  |  | 20,275 |  |  | 51,209 |
Gross profit |  |  | 2,047 |  |  | 433 |  |  |  |  | (7) |  |  | 2,473 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  | 4,208 |  |  | 4,229 |  |  |  |  | 2,951 |  |  | 11,388 |
General and administrative |  |  | 788 |  |  | 2,974 |  |  |  |  | 2,658 |  |  | 6,420 |
Sales and marketing |  |  | 404 |  |  | 886 |  |  |  |  | 404 |  |  | 1,694 |
Depreciation and amortization |  |  | 112 |  |  | 126 |  |  |  |  | 1,209 |  |  | 1,447 |
|  |  | 5,512 |  |  | 8,215 |  |  |  |  | 7,222 |  |  | 20,949 |
Add back: Depreciation and amortization 1 |  |  | 372 |  |  | 1,399 |  |  |  |  | 1,610 |  |  | 3,381 |
Segment EBITDA |  |  | $ | (3,093) |  |  | $ | (6,383) |  |  |  |  | $ | (5,619) |  |  | $ | (15,095) |

20

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

15. Segment information (continued):
Reconciliations of reportable segment financial information to consolidated statement of operations:

| Three months ended September 30, 2025
| Total Segment |  | Less: Cespira |  | Add: Corporate & unallocated |  |  |  | Total Consolidated
Revenue | $ | 20,945 |  |  | $ | 19,328 |  |  | $ | — |  |  |  |  | $ | 1,617 |
Cost of revenue | 21,509 |  |  | 20,364 |  |  | — |  |  |  |  | 1,145 |
Gross profit | (564) |  |  | (1,036) |  |  | — |  |  |  |  | 472 |
Operating expenses: |  |  |  |  |  |  |  |  |
Research and development | 3,454 |  |  | 1,135 |  |  | — |  |  |  |  | 2,319 |
General and administrative | 2,928 |  |  | 2,410 |  |  | 3,612 |  |  |  |  | 4,130 |
Sales and marketing | 463 |  |  | 357 |  |  | 199 |  |  |  |  | 305 |
Depreciation and amortization | 941 |  |  | 833 |  |  | 38 |  |  |  |  | 146 |
| 7,786 |  |  | 4,735 |  |  | 3,849 |  |  |  |  | 6,900 |
Equity loss | — |  |  | — |  |  | (3,197) |  |  |  |  | (3,197) |

| Three months ended September 30, 2024
| Total Segment |  | Less: Cespira |  | Add: Corporate & unallocated |  |  |  | Total Consolidated
Revenue | $ | 21,086 |  |  | $ | 16,209 |  |  | $ | — |  |  |  |  | $ | 4,877 |
Cost of revenue | 20,588 |  |  | 16,374 |  |  | — |  |  |  |  | 4,214 |
Gross profit | 498 |  |  | (165) |  |  | — |  |  |  |  | 663 |
Operating expenses: |  |  |  |  |  |  |  |  |
Research and development | 2,458 |  |  | 1,830 |  |  | — |  |  |  |  | 628 |
General and administrative | 2,290 |  |  | 1,943 |  |  | 3,069 |  |  |  |  | 3,416 |
Sales and marketing | 415 |  |  | 335 |  |  | 287 |  |  |  |  | 367 |
Depreciation and amortization | 975 |  |  | 944 |  |  | 72 |  |  |  |  | 103 |
| 6,138 |  |  | 5,052 |  |  | 3,428 |  |  |  |  | 4,514 |
Equity loss | — |  |  | — |  |  | (3,002) |  |  |  |  | (3,002) |

| Nine months ended September 30, 2025
| Total Segment |  | Less: Cespira |  | Add: Corporate & unallocated |  |  |  | Total Consolidated
Revenue | $ | 69,585 |  |  | $ | 48,147 |  |  | $ | — |  |  |  |  | $ | 21,438 |
Cost of revenue | 69,183 |  |  | 50,594 |  |  | — |  |  |  |  | 18,589 |
Gross profit | 402 |  |  | (2,447) |  |  | — |  |  |  |  | 2,849 |
Operating expenses: |  |  |  |  |  |  |  |  |
Research and development | 11,211 |  |  | 6,025 |  |  | — |  |  |  |  | 5,186 |
General and administrative | 9,151 |  |  | 7,829 |  |  | 9,586 |  |  |  |  | 10,908 |
Sales and marketing | 1,254 |  |  | 975 |  |  | 759 |  |  |  |  | 1,038 |
Depreciation and amortization | 2,646 |  |  | 2,423 |  |  | 137 |  |  |  |  | 360 |
| 24,262 |  |  | 17,252 |  |  | 10,482 |  |  |  |  | 17,492 |
Equity loss | — |  |  | — |  |  | (10,767) |  |  |  |  | (10,767) |

21

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

15. Segment information (continued):

| Nine months ended September 30, 2024
| Total Segment |  | Less: Cespira |  | Add: Corporate & unallocated |  |  |  | Total Consolidated
Revenue | $ | 53,682 |  |  | $ | 20,268 |  |  | $ | — |  |  |  |  | $ | 33,414 |
Cost of revenue | 51,209 |  |  | 20,275 |  |  | — |  |  |  |  | 30,934 |
Gross profit | 2,473 |  |  | (7) |  |  | — |  |  |  |  | 2,480 |
Operating expenses: |  |  |  |  |  |  |  |  |
Research and development | 11,388 |  |  | 2,951 |  |  | — |  |  |  |  | 8,437 |
General and administrative | 6,420 |  |  | 2,658 |  |  | 12,569 |  |  |  |  | 16,331 |
Sales and marketing | 1,694 |  |  | 404 |  |  | 1,160 |  |  |  |  | 2,450 |
Depreciation and amortization | 1,447 |  |  | 1,209 |  |  | 321 |  |  |  |  | 559 |
| 20,949 |  |  | 7,222 |  |  | 14,050 |  |  |  |  | 27,777 |
Equity loss | — |  |  | — |  |  | (4,104) |  |  |  |  | (4,104) |

Reconciliation of Segment EBITDA to Loss before income taxes |  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Total Segment EBITDA |  | $ | (6,597) |  |  | $ | (4,381) |  |  | $ | (18,527) |  |  | $ | (15,095) |
Adjustments: |  |  |  |  |  |  |  |
Depreciation and amortization 1 |  | 181 |  |  | 225 |  |  | 569 |  |  | 2,092 |
Cespira's Segment EBITDA |  | (4,161) |  |  | (4,111) |  |  | (14,798) |  |  | (5,619) |
Loss on investments accounted for under the equity method (note 8) |  | 3,197 |  |  | 3,002 |  |  | 10,767 |  |  | 4,104 |
Corporate and unallocated operating expenses |  | 3,811 |  |  | 3,356 |  |  | 10,345 |  |  | 13,729 |
Foreign exchange (loss) gain |  | 1,282 |  |  | (1,709) |  |  | (4,145) |  |  | 86 |
Gain on deconsolidation |  | — |  |  | — |  |  | — |  |  | (13,266) |
Loss on sale of investments |  | — |  |  | 352 |  |  | — |  |  | 352 |
Interest on long-term debt |  | 142 |  |  | 257 |  |  | 500 |  |  | 859 |
Interest and other income, net of bank charges |  | (653) |  |  | (215) |  |  | (1,155) |  |  | (235) |
Loss before income taxes in continuing operations |  | $ | (10,396) |  |  | $ | (5,538) |  |  | $ | (20,610) |  |  | $ | (17,197) |

1 Depreciation and amortization expenses used in computation for Segment EBITDA and reconciliation to consolidated loss before income taxes are included in cost of revenue and operating expenses on our statement of operations and comprehensive income (loss).
22

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

15. Segment information (continued):

|  | Three months ended September 30, |  | Nine months ended September 30,
Total additions to long-lived assets, excluding business combinations |  | 2025 |  | 2024 |  | 2025 |  | 2024
High-Pressure Controls & Systems |  | 514 |  |  | 183 |  |  | 1,893 |  |  | 1,620 |
Heavy-Duty OEM |  | — |  |  | — |  |  | — |  |  | 569 |
Corporate and unallocated |  | — |  |  | — |  |  | 16 |  |  | — |
Total consolidated |  | $ | 514 |  |  | $ | 183 |  |  | $ | 1,909 |  |  | $ | 2,189 |

Cespira's total additions to long-lived assets, excluding business combinations for the three and nine months ended September 30, 2025 was $1,325 and $2,896, respectively (three and nine months ended September 30, 2024 was $154 and $164, respectively).
Revenues are attributable to geographical regions based on the location of the Company’s customers and are presented as a percentage of the Company's continuing revenues, as follows:

|  | % of revenue
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Europe |  | 25 | % |  | 84 | % |  | 75 | % |  | 86 | %
Asia |  | 33 | % |  | 8 | % |  | 16 | % |  | 10 | %
Americas |  | 42 | % |  | 8 | % |  | 9 | % |  | 4 | %

The measure of segment assets evaluated by the CODM are total assets as reported on the consolidated balance sheet. Total assets are allocated as follows:

|  | Total assets by segment
|  | September 30, 2025 |  | December 31, 2024
Light-Duty (Held-for-sale) |  | $ | — |  |  | $ | 207,893 |
High-Pressure Controls & Systems |  | 14,470 |  |  | 9,026 |
Heavy-Duty OEM |  | 266 |  |  | 9,138 |
Corporate |  | 89,357 |  |  | 65,564 |
Total consolidated assets |  | $ | 104,093 |  |  | $ | 291,621 |

16. Financial instruments:
Financial management risk
The Company has exposure to liquidity risk, credit risk, foreign currency risk and interest rate risk.
Liquidity risk
Liquidity risk is the risk that the Company will not be able to meet its financial obligations as they are due. The Company has a history of operating losses and negative cash flows from operations. At September 30, 2025, the Company had $33,096 of cash and cash equivalents, including $354 in restricted cash.
23

WESTPORT FUEL SYSTEMS INC.
Notes to Condensed Consolidated Interim Financial Statements (unaudited)
(Expressed in thousands of United States dollars, except share and per share amounts)
Three and nine months ended September 30, 2025 and 2024

16. Financial Instruments (continued):
The following are the contractual maturities of financial obligations as at September 30, 2025:

|  | Carrying amount |  | Contractual cash flows |  | < 1 year |  | 1-3 years |  | 4-5 years |  |
Accounts payable and accrued liabilities |  | $ | 15,550 |  |  | $ | 15,550 |  |  | $ | 15,550 |  |  | $ | — |  |  | $ | — |  |  |
Term loan facility (note 11) |  | 3,903 |  |  | 4,372 |  |  | 4,372 |  |  | — |  |  | — |  |  |
Operating lease obligations |  | 1,811 |  |  | 2,716 |  |  | 627 |  |  | 1,674 |  |  | 415 |  |  |
|  | $ | 21,264 |  |  | $ | 22,638 |  |  | $ | 20,549 |  |  | $ | 1,674 |  |  | $ | 415 |  |  |

Fair value of financial instruments
As at September 30, 2025, cash and cash equivalents are measured at fair value on a recurring basis and are included in Level 1.
The carrying amounts reported in the unaudited condensed consolidated interim balance sheets for accounts receivable, and accounts payable and accrued liabilities approximate their fair values due to the short-term period to maturity of these instruments.
The long-term investments represent the Company's interests in Cespira and is accounted for using the equity method.
The carrying values reported in the condensed consolidated interim balance sheets for obligations under operating leases, which are based upon discounted cash flows, approximate their fair values.
The carrying value of the term loan facility included in long-term debt (note 11) is carried at amortized cost, which approximate its fair value as at September 30, 2025.
The Company categorizes its fair value measurements for items measured at fair value on a recurring basis into three categories as follows:

| Level 1 – | Unadjusted quoted prices in active markets for identical assets or liabilities.
| Level 2 – | Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
| Level 3 – | Inputs for the asset or liability that are not based on observable market data (unobservable inputs).

When available, the Company uses quoted market prices to determine fair value and classify such items in Level 1. When necessary, Level 2 valuations are performed based on quoted market prices for similar instruments in active markets and/or model–derived valuations with inputs that are observable in active markets. Level 3 valuations are undertaken in the absence of reliable Level 1 or Level 2 information.
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