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 March 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: March 18, 2022

Exhibit99.1

HongKong Exchanges and Clearing Limited, The Stock Exchange of Hong Kong Limited (the “Hong Kong Stock Exchange”) andHong Kong Securities Clearing Company Limited take no responsibility for the contents of this announcement, make no representation asto its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance uponthe whole or any part of the contents of this announcement.

Thisannouncement is for information purposes only and does not constitute an invitation or offer to acquire, purchase or subscribe for sharesor other securities of NIO Inc. (the “Company”). Prospective investors should read the listing document dated February28, 2022 (the “Listing Document ”) for detailed information about the Company.

Unlessotherwise defined in this announcement, capitalized terms in this announcement shall have the same meanings as those defined in the ListingDocument.

NIOInc.

(Acompany controlled through weighted voting rights and incorporated in the Cayman Islands with limited liability)

(StockCode: 9866)

SECONDARYLISTING BY WAY OF INTRODUCTION

ONTHE MAIN BOARD OF

THESTOCK EXCHANGE OF HONG KONG LIMITED

LiquidityArrangements regarding the Average Daily Trading Volume of Our Class A Ordinary Shares on the Hong Kong Stock Exchange

JointSponsors

INTRODUCTION

Reference is made to the Listing Document, the Formal Notice and the March 10 Announcement issued by the Company.

As at the date of this announcement, there are approximately 1,669,006,134 ordinary shares outstanding, comprising of approximately 1,520,506,134 Class A ordinary shares (excluding the Class A ordinary shares issued and reserved for future issuance upon the exercising or vesting of awards granted under our Stock Incentive Plans) and 148,500,000 Class C ordinary shares.

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LIQUIDITYARRANGEMENT REGARDING AVERAGE DAILY TRADING VOLUME OF OUR CLASS A ORDINARY SHARES ON THE HONG KONG STOCK EXCHANGE

Dealings in our Class A ordinary shares on the Hong Kong Stock Exchange commenced on March 10, 2022.

As stated in the section headed “Market Arrangements to Facilitate Dealings in Hong Kong” of the Listing Document, the Bridging Period (being the 30-day period from and including the Listing Date) started from 9:00 a.m. on March 10, 2022 and will end at 4:10 p.m. on April 8, 2022.

The following table sets forth the average daily trading volume and average daily turnover of our Class A ordinary shares on the Hong Kong Stock Exchange from March 10, 2022 to March 17, 2022.

As stated in the section headed “Market Arrangements to Facilitate Dealings in Hong Kong” of the Listing Document and the March 10 Announcement, the Company will release further announcements on March 24, 2022, March 31, 2022 and April 7, 2022 on liquidity arrangements regarding the average daily trading volume of our Class A ordinary shares on the Hong Kong Stock Exchange.

Asat the date of this announcement, the board of directors of the Company comprises Mr. Bin Li as the Chairman, Mr. Lihong Qin, Mr. JamesGordon Mitchell as the directors, and Mr. Hai Wu, Mr. Denny Ting Bun Lee and Ms. Yu Long as the independent directors.

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