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 2018

Commission File Number: 001- 38638

NIO Inc.

Building 20, No. 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 of Form 20-F or Form 40-F.

Form 20-F  ☒            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):  ☐

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 17, 2018

Exhibit Index

Exhibit 99.1—Press Release

Exhibit 99.2—Press Release

Exhibit 99.1

NIO Officially Launches NIO ES6 at NIO Day 2018

Bruno Mars Performance Wows Crowd at NIO Day 2018 Concert

Shanghai, China – December 15 – The annual NIO Day 2018 was celebrated at the Shanghai Oriental Sports Center, with the world premiere of the ES6 high-performance long-range electric SUV.

An annual celebration for NIO and its friends, NIO Day 2018 was held under the theme of “Together & Better,” highlighting the event as a “fun gathering for NIO users to grow together”. About 10,000 NIO users and friends attended the event, and many others participated at 53 locations globally.

The ES6 high-performance long-range intelligent electric SUV hit the market during the evening product launch. With a high-strength aluminum & carbon fiber reinforced plastics (CFRP) hybrid structure, the ES6 features 4.7 second 0-100 km/h acceleration, a NEDC range of over 510 km, and 33.9-meter braking distance from 100-0 km/h. The ES6 expands the design language of the NIO product line with a stylish and sporty exterior plus a refined, high-tech interior.

The ES6 currently offers the Standard and Performance Versions with pre-subsidiary starting prices of 358,000 and 398,000 yuan respectively. It is customized and made to order. Users can now pre-order the ES6 through the NIO App, with deliveries starting in June 2019.

NIO has delivered 9,726 ES8 SUVs as of December 15^th. It announced that the ES8 supports upgrading to the latest 84-kWh battery system, and that it will release the specific upgrade plan in Q2 2019, with 84-kWh battery upgrades planned to be made available for the ES8 in Q3 2019.

NIO also announced the pre-subsidy price of the six-seater NIO ES8 variant starting at 456,000 RMB, with online pre-ordering expected to begin on December 24^th and delivery to start in late March 2019.

Three major service systems, namely, NIO House, NIO Service and NIO Power, are also set to be upgraded in 2019.

26 NIO Houses and experience stores have been opened in China as of 2018. In 2019, NIO plans to open even more locations, set to total 70 by the end of the year. In addition to the existing battery swap stations along the G4 Expressway, NIO will set up even more stations along certain expressways in 2019 to meet user demand. In the area of maintenance and repairs, NIO has already begun to deploy a network of service centers across China. By the end of 2018, NIO will build a nationwide service network with over 160 service outlets across China. That number is expected to increase to over 300 in 2019, further enhancing NIO’s service capabilities.

Prior to the press conference, more than 1,500 users participated in the first annual NIO User Conference. Fourteen users performed on stage at the user conference, featuring as one of the highlights of NIO Day 2018. At the concert after the press conference, Bruno Mars performed a selection of his Billboard hits for the audience, delighting the crowd at the Shanghai Oriental Sports Center.

“We are committed to redefining the user experience and creating a community centered around our users, enjoying life and growing together. The ES6 launch and the NIO Day have set another NIO community milestone,” said NIO Founder, Chairman and CEO, William Li.

About NIO

NIO Inc. is a pioneer in China’s premium electric vehicle market, founded in November 2014. NIO’s mission is to shape a joyful lifestyle by offering premium smart electric vehicles and being the best user enterprise. NIO designs, jointly manufactures, and sells smart and connected premium electric vehicles, driving innovations in next generation technologies in connectivity, autonomous driving and artificial intelligence. Redefining the user experience, NIO provides users with comprehensive, convenient and innovative charging solutions and other user-centric services. NIO began deliveries of the ES8, a 7-seater high performance premium electric SUV in China from June 2018 and officially launched the ES6, a 5-seater high-performance premium electric SUV, on NIO Day, December 15, 2018.

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. 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. Further information regarding these and other risks is included in NIO’s filings with the SEC. 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.

Exhibit 99.2

Press Release

Dec. 15, 2018

Shanghai, China

NIO ES6 Launches at Pre-subsidy Price Starting from 358,000 RMB with NEDC Range of 510 Kilometers

Shanghai, China — December 15 — The NIO ES6 was officially launched on December 15, 2018 during the annual NIO Day celebration. This high-performance long-range intelligent electric SUV starts at a pre-subsidy price of 358,000 RMB, and is available now for public pre-order via the NIO app, with delivery to start in June 2019.

Powerful, All-round Performance

The NIO ES6 boasts high performance. It features dual motors in conjunction with an intelligent electric all-wheel-drive system delivering output power of up to 400 kW (544 hp), peak torque of 725 Nm and 0-100 km/h acceleration in as little as 4.7 seconds.

The ES6 boasts excellent braking performance, decelerating from 100-0 km/h in just 33.9 meters.

High-performance independent suspension, Continuous Damping Control (CDC), intelligent electric all-wheel drive come standard, and users also have the option of equipping vehicle with next-gen active air suspension. Drivers can also switch between multiple driving modes, bringing a comfortable and enjoyable experience.

The ES6 sports the only body design with a hybrid structure of aluminum alloy and carbon fiber in its class. Its composed of 91% aluminum throughout the vehicle, with innovative use of aircraft-grade 7 Series aluminum. Structural elements made of high-strength carbon fiber make the ES6 lighter and more solid.

An overall torsional stiffness of 44,930 Nm/degree is the highest among production SUVs globally.

Aluminum alloy and carbon fiber compose the vehicle body

Two Efficient Motors and a 510-km Range

The ES6 is the world’s first SUV equipped with a combination of permanent magnet and induction motors, which allows for power and endurance alike. The front permanent magnet motor delivers power of up to 160 kW, peak torque of 305 Nm and an energy conversion rate of 97%; the rear induction motor delivers 240 kW and 420 Nm and contributes to fast acceleration.

The ES6 is equipped with a combination of permanent magnet and induction motors

The 84-kWh liquid-cooled thermostatic battery pack, optional across the range, features world-class NCM 811 cathode material and energy density of up to 170 Wh/kg.

84-kWh liquid-cooled thermostatic battery pack

The ES6 features an excellent lightweight design and drag coefficient Cd of only 0.28 which both contribute to a combined range of up to 510 km.

As NIO Power continues to expand, the combination of home charging, mobile charging vehicles, battery swap stations and the One Touch Charging service will further ease user concerns in regards to range.

Advanced Intelligent Experiences

The NIO digital cockpit built on the NOMI in-car artificial intelligence (AI) system is integrated with a speech-based interactive system. An upgraded HUD, digital instrument cluster and 11.3 inch second-generation multitouch screen put all vehicle information at the users’ fingertips.

NOMI has been updated with more expressions and further enhanced speech capabilities

ES6 features pre-installed NIO Pilot hardware, including a Mobileye EyeQ4 chip and 23 sensors. NIO Pilot supports over 20 functions covering typical scenarios of car use in China. Functions can be upgraded over time via firmware-over-the-air (FOTA).

An intelligent fragrancing system offers four different fragrances for a more pleasant occupant experience. This optional system interacts with the vehicle’s other systems for automatic paring with different user accounts and situations.

11.3 inch second-generation multitouch screen

The ES6 is equipped with Lion, a high-performance intelligent gateway enabling data exchange and remote upgrading via FOTA. Additionally, the Dragon security architecture offers a matrix-like firewall to enhance data security and protect user privacy.

Design: Stylish, Sporty Exterior plus Refined, High-tech Interior

The ES6 has a length of 4,850 mm, a width of 1,965 mm, a height of 1,768 mm and a wheelbase of 2,900 mm, bringing a comfortably large space.

The NIO ES6 brings a comfortably large space

This new model continues the NIO family design language. The X-bar across the front end is in the same color as that of the body, integrating with the sweeping turning lights and smoky daytime running lights. This, plus the low-drag grille, tilted D pillars, sharp and straight window lines, more streamlined heartbeat taillights and rear shark fin style reflector design, highlights stylishness and sportiness.

The X-bar across the front end is in the same color as that of the body

The newly designed sport seats and multifunctional leather steering wheel add to the interior’s sporty atmosphere. The microfiber headliner, Nappa leather upholstery and unique Eclipse Chrome trim throughout the interior underscore technology and refinement.

Nappa leather upholstery throughout the interior and individual bucket seats

Service Upgrades

In 2019, NIO plans to fully upgrade three service systems, namely, NIO House, NIO Service and NIO Power. It also plans to open 70 NIO Houses and pop-up NIO Houses by the end of the same year. Depending on user needs, NIO will also set up more battery swap stations for expressways.

In addition to the G4 Expressway battery swap network, NIO has partly finished building the battery swap network for the G2 Beijing-Shanghai Expressway and the G15 Shenyang-Haikou Expressway, which are both soon to be completed.

NIO has built a nationwide support network. By 2019, it plans to open over 300 service outlets to further enhance its ability to offer services.

Pricing and Pre-order

The ES6 is available in two versions – the Standard Version and the Performance Version. NIO users can now choose from the battery plan and receive a 100,000 RMB discount off of the price of the vehicle. The price of the battery plan is 1,660 RMB per month. In addition, NIO also released a ES6 Premier Edition with a limited quantity of 6,000. Priority deliveries are targeted to begin in June 2019. Every ES6 is customized and made to order. Starting today, ES6 is available on the NIO APP.

About NIO

NIO Inc. is a pioneer in China’s premium electric vehicle market, founded in November 2014. NIO’s mission is to shape a joyful lifestyle by offering premium smart electric vehicles and being the best user enterprise. NIO designs, jointly manufactures, and sells smart and connected premium electric vehicles, driving innovations in next generation technologies in connectivity, autonomous driving and artificial intelligence. Redefining the user experience, NIO provides users with comprehensive, convenient and innovative charging solutions and other user-centric services. NIO began deliveries of the ES8, a 7-seater high performance premium electric SUV in China from June 2018 and officially launched the ES6, a 5-seater high-performance premium electric SUV, on NIO Day, December 15, 2018.

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. 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. Further information regarding these and other risks is included in NIO’s filings with the SEC. 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.

MORE INFORMATION AND CONTACTS:

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CONTACT

Yasha Wolfman

China                

yasha.wolfman@nio.com

Annie Weckesser

US

annie.weckesser@nio.io

Philipp Erdmannsdorffer

Germany

Philipp.Erdmannsdorffer@nio.com

Thomas Rice – Jones

UK

thomas.rice-jones@nio.com