6-K

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 July 2025

Commission File Number: 001-41431

Polestar Automotive Holding UK PLC

Assar Gabrielssons Väg 9

405 31 Göteborg, Sweden

(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 ¨

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

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

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K

On July 10, 2025, Polestar Automotive Holding UK PLC (“Polestar”) issued a press release announcing its preliminary estimates for global volumes for the second quarter of 2025. A copy of the press release is attached hereto as Exhibit 99.1.

Exhibit 99.1 to this Report on Form 6-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act.

EXHIBIT INDEX

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.

Exhibit 99.1

Polestarretail sales volumes totalled 18,049 cars in Q2, a growth of 38% year-on-year

GOTHENBURG,SWEDEN – 10 July 2025 – Polestar (Nasdaq: PSNY) retail sales volumes amounted to an estimated 18,049 cars in Q2 2025, up 38% versus Q2 2024. For the first six months of the year, retail sales volumes approximated 30,319 cars, a growth of 51% compared to the same period last year.

Michael Lohscheller, Polestar CEO, says: “We’ve delivered another strong quarter of growth, in increasingly challenging market and geopolitical conditions. Volume growth of 38% in the second quarter and 51% in the first half of the year is a clear sign that our retail expansion is delivering and that more customers are choosing Polestar.”

Breakdown of retail sales volumes:

Ends.

Contacts

Anna Gavrilova

Head of Investor Relations

[email protected]

Theo Kjellberg

Head of Corporate Communication

[email protected]

AboutPolestar Polestar (Nasdaq: PSNY) is the Swedish electric performance car brand with a focus on uncompromised design and innovation, and the ambitionto accelerate the change towards a sustainable future. Headquartered in Gothenburg, Sweden, its cars are available in 27 markets globallyacross North America, Europe and Asia Pacific.

Polestarhas three models in its line-up: Polestar 2, Polestar 3, and Polestar 4. Planned models include the Polestar 5 four-door GT (to be introducedin 2025), the Polestar 6 roadster and the Polestar 7 compact SUV. With its vehicles currently manufactured on two continents, North Americaand Asia, Polestar plans to diversify its manufacturing footprint further, with production of Polestar 7 planned in Europe.

Polestarhas an unwavering commitment to sustainability and has set an ambitious roadmap to reach its climate targets: halve greenhouse gas emissionsby 2030 per-vehicle-sold and become climate-neutral across its value chain by 2040. Polestar’s comprehensive sustainability strategycovers the four areas of Climate, Transparency, Circularity, and Inclusion.

Forward-LookingStatements

Certainstatements in this press release (“Press Release”) may be considered “forward-looking statements” as definedin the Private Securities Litigation Reform Act of 1995. Forward-looking statements generally relate to future events or the future financialor operating performance of Polestar including the number of vehicle deliveries and gross margin. For example, projections of revenue,volumes, margins, cash flow break-even and other financial or operating metrics and statements regarding expectations of future needsfor funding and plans related thereto are forward-looking statements. In some cases, you can identify forward-looking statements by terminologysuch as “may”, “should”, “expect”, “intend”, “will”, “estimate”, “anticipate”, “believe”, “predict”, “potential”, “forecast”, “plan”, “seek”, “future”, “propose” or “continue”, or the negatives of these terms or variationsof them or similar terminology. Such forward-looking statements are subject to risks, uncertainties, and other factors which could causeactual results to differ materially from those expressed or implied by such forward looking statements.

Theseforward-looking statements are based upon estimates and assumptions that, while considered reasonable by Polestar and its management,as the case may be, are inherently uncertain. Factors that may cause actual results to differ materially from current expectations include,but are not limited to: (1) Polestar’s ability to enter into or maintain agreements or partnerships with its strategic partners,including Volvo Cars and Geely, original equipment manufacturers, vendors and technology providers; (2) Polestar’s abilityto maintain relationships with its existing suppliers, source new suppliers for its critical components and enter into longer term supplycontracts and complete building out its supply chain; (3) Polestar’s ability to raise additional funding; (4) Polestar’sability to successfully execute cost-cutting activities and strategic efficiency initiatives; (5) Polestar’s estimates ofexpenses, profitability, gross margin, cash flow, and cash reserves; (6) the identification and remediation of accounting errorsand/or a final assessment of errors already identified that differs significantly from Polestar’s preliminary view of such errorsand the successful filing of restatements of any SEC reports; (7) Polestar’s ability to continue to meet stock exchange listingstandards; (8) changes in domestic and foreign business, market, financial, political and legal conditions; (9) demand forPolestar’s vehicles or car sale volumes, revenue and margin development based on pricing, variant and market mix, cost reductionefficiencies, logistics and growing aftersales; (10) delays in the expected timelines for the development, design, manufacture,launch and financing of Polestar’s vehicles and Polestar’s reliance on a limited number of vehicle models to generate revenues;(11) increases in costs, disruption of supply or shortage of materials, in particular for lithium-ion cells or semiconductors; (12) risksrelated to product recalls, regulatory fines and/or an unexpectedly high volume of warranty claims; (13) Polestar’s reliance onits partners to manufacture vehicles at a high volume, some of which have limited experience in producing electric vehicles, and on theallocation of sufficient production capacity to Polestar by its partners in order for Polestar to be able to increase its vehicle productionvolumes; (14) the ability of Polestar to grow and manage growth profitably, maintain relationships with customers and suppliers and retainits management and key employees; (15) risks related to future market adoption of Polestar’s offerings; (16) risks related to Polestar’scurrent distribution model and the evolution of its distribution model in the future; (17) the effects of competition and the high barriersto entry in the automotive industry and the pace and depth of electric vehicle adoption generally on Polestar’s future business;(18) changes in regulatory requirements (including environmental laws and regulations and regulations related to connected vehicles),governmental incentives, tariffs and fuel and energy prices; (19) Polestar’s reliance on the development of vehicle charging networksto provide charging solutions for its vehicles and its strategic partners for servicing its vehicles and their integrated software; (20)Polestar’s ability to establish its brand and capture additional market share, and the risks associated with negative press orreputational harm, including from electric vehicle fires; (21) the outcome of any potential litigation, including litigation involvingPolestar and Gores Guggenheim, Inc., government and regulatory proceedings, tax audits, investigations and inquiries; (22) Polestar’sability to continuously and rapidly innovate, develop and market new products; (23) the impact of the ongoing conflict between Ukraineand Russia and in Israel, the Gaza Strip and the Red Sea; and (24) other risks and uncertainties set forth in the sections entitled “RiskFactors” and “Cautionary Note Regarding Forward-Looking Statements” in Polestar’s Form 20-F, and other documentsfiled, or to be filed, with the SEC by Polestar. There may be additional risks that Polestar presently does not know or that Polestarcurrently believes are immaterial that could also cause actual results to differ from those contained in the forward-looking statements.

Nothingin this Press Release should be regarded as a representation by any person that the forward-looking statements set forth herein willbe achieved or that any of the contemplated results of such forward-looking statements will be achieved. You should not place undue relianceon forward-looking statements, which speak only as of the date they are made. Polestar assumes no obligation to update these forward-lookingstatements, even if new information becomes available in the future, except as may be required by law.