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 December 2022

Commission File Number: 001-38638

NIO Inc.

(Registrant’s Name)

Building 20, 56 Antuo Road

Jiading District, Shanghai 201804

People’s Republic of China

(Address of Principal Executive Offices)

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

Form 20-F 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): ¨

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.

Date: December 20, 2022

Exhibit 99.1

NIO Inc. Promptly Responds to Data Leakage

Shanghai, China, December 20, 2022, (GLOBE NEWSWIRE) -- NIO Inc. (NYSE: NIO; HKEX: 9866; SGX: NIO) (“NIO” or the “Company”), a pioneer and a leading company in the premium smart electric vehicle market, today issued this press release in response to a recent incident related to NIO’s data security.

On December 20, 2022, the Company was made aware that certain information of users and vehicle sales in China before August 2021 was sold on the internet by third parties for illegal purposes.

NIO has issued a public statement in China related to the incident, including providing a dedicated hotline and an email address to respond to users’ queries regarding the data leakage. The Company has also undertaken the responsibilities for the loss that the users may incur in connection with the data leakage.

NIO deeply regrets this incident happened, and is doing everything possible to support its users. NIO continues to work with governmental authorities to investigate the incident and implement necessary measures to contain potential damages. NIO reaffirms its commitment to protecting data security and privacy of its users.

About NIO Inc.

NIO Inc. is a pioneer and a leading company in the premium smart electric vehicle market. Founded in November 2014, NIO’s mission is to shape a joyful lifestyle. NIO aims to build a community starting with smart electric vehicles to share joy and grow together with users. NIO designs, develops, jointly manufactures and sells premium smart electric vehicles, driving innovations in next-generation technologies in autonomous driving, digital technologies, electric powertrains and batteries. NIO differentiates itself through its continuous technological breakthroughs and innovations, such as its industry-leading battery swapping technologies, Battery as a Service, or BaaS, as well as its proprietary autonomous driving technologies and Autonomous Driving as a Service, or ADaaS. NIO’s product portfolio consists of the ES8, a six- or seven-seater flagship premium smart electric SUV, the ES7 (or the EL7), a mid-large five-seater premium smart electric SUV, the ES6, a five-seater high-performance premium smart electric SUV, the EC6, a five-seater premium smart electric coupe SUV, the ET7, a flagship premium smart electric sedan, and the ET5, a mid-size premium smart electric sedan.

Safe Harbor Statement

This press release contains statements that may constitute “forward-looking” statements pursuant to the “safe harbor” provisions of the U.S. Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified by terminology such as “will,” “expects,” “anticipates,” “aims,” “future,” “intends,” “plans,” “believes,” “estimates,” “likely to” and similar statements. NIO may also make written or oral forward-looking statements in its periodic reports to the U.S. Securities and Exchange Commission, in its annual report to shareholders, in announcements, circulars or other publications made on the websites of each of The Stock Exchange of Hong Kong Limited (the “SEHK”) and the Singapore Exchange Securities Trading Limited (the “SGX-ST”), in press releases and other written materials and in oral statements made by its officers, directors or employees to third parties. Statements that are not historical facts, including statements about NIO’s beliefs, plans and expectations, are forward-looking statements. Forward-looking statements involve inherent risks and uncertainties. A number of factors could cause actual results to differ materially from those contained in any forward-looking statement, including but not limited to the following: NIO’s strategies; NIO’s future business development, financial condition and results of operations; NIO’s ability to develop and manufacture a car of sufficient quality and appeal to customers on schedule and on a large scale; its ability to ensure and expand manufacturing capacities including establishing and maintaining partnerships with third parties; its ability to provide convenient and comprehensive power solutions to its customers; the viability, growth potential and prospects of the newly introduced BaaS and ADaaS; its ability to improve the technologies or develop alternative technologies in meeting evolving market demand and industry development; NIO’s ability to satisfy the mandated safety standards relating to motor vehicles; its ability to secure supply of raw materials or other components used in its vehicles; its ability to secure sufficient reservations and sales of the ES8, ES7 (or the EL7), ES6, EC6, ET7 and ET5; its ability to control costs associated with its operations; its ability to build the NIO brand; general economic and business conditions globally and in China and assumptions underlying or related to any of the foregoing. Further information regarding these and other risks is included in NIO’s filings with the U.S. Securities and Exchange Commission and the announcements and filings on the websites of each of the SEHK and SGX-ST. All information provided in this press release is as of the date of this press release, and NIO does not undertake any obligation to update any forward-looking statement, except as required under applicable law.

For more information, please visit: http://ir.nio.com

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