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 September 2018

Commission File Number: 001-38587

Aurora Mobile Limited

5/F, Building No. 7, Zhiheng Industrial Park

Nantou Guankou Road 2, Nanshan District

Shenzhen, Guangdong 518052

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: September 7, 2018

Exhibit Index

Exhibit 99.1—Press Release

Exhibit 99.1

Aurora Mobile Limited Announces Second Quarter 2018

Unaudited Financial Results

SHENZHEN, CHINA – September 6, 2018 – Aurora Mobile Limited (“Aurora Mobile” or the “Company”) (NASDAQ:JG), a leading mobile big data solutions platform in China, today announced its unaudited financial results for the second quarter ended June 30, 2018.

Second Quarter 2018 Financial Highlights

Second Quarter 2018 Operational Highlights

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“This is our first earnings report as a public company following our listing on Nasdaq on July 26, 2018,” commented Mr. Weidong Luo, Chairman and Chief Executive Officer of Aurora Mobile. “I am pleased to report strong financial and operational results for our second quarter 2018. During the quarter, the number of mobile apps using our services grew from 583,000 as of June 2017 and 784,000 as of March 31, 2018 to approximately 888,000 as of June 2018.”

“The number of monthly active unique devices we covered increased from 633 million in June 2017 and 951 million in March 2018 to 971 million in June 2018. Cumulative SDK installations increased sequentially from 13.9 billion and 8.5 billion during the same period last year to 14.9 billion. The number of paying customers increased from 1,308 last quarter and 1,165 during the same period last year to 1,602.”

“As a result, our revenues grew to RMB165.1 million from RMB126.4 million last quarter and RMB49.5 million during the same period last year, an increase of 30.6% and 233.6%, respectively.”

“Developer services revenues increased by 69.4% year-over-year from RMB8.6 million to RMB14.5 million, primarily due to growth in the number of paying customers from 715 to 1,005.”

“We believe these solid results demonstrate the traction our comprehensive suite of services are generating in the market and our ability to leverage them to strengthen our leadership position.”

Mr. Fei Chen, President of Aurora Mobile, commented that “Within the data solutions revenue, targeted marketing revenues increased by 248.3% year-over-year from RMB37.8 million to RMB131.7 million. This was mainly due to an increase in both the number of customers and the average spending per paying customer. Revenues from customers from the financial services and media & entertainment sectors in particular generated strong growth. We are seeing customers increasing their spending on our products and services which I believe is strong evidence of our ability to provide a substantial and quantifiable return on their investment. We are also making solid progress in other verticals, such as eCommerce, as we continued to execute our strategy to generate growth from multiple industries.”

“Other vertical data solutions revenues increased by 509.7% year-over-year from RMB3.1 million to RMB18.9 million. This was mainly due to an increase in both the number of paying customers and average spending per paying customer. We saw strong growth across all three product lines, including financial risk management, market intelligence, and location-based intelligence (iZone), as we continue to expand our sales coverage and penetrate further into these industry verticals.”

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Mr. Shan-Nen Bong, Chief Financial Officer of Aurora Mobile, added, “Strong topline growth during the quarter allowed us to generate a 411.0% year-over-year increase in gross profit. Total operating expenses, on the other hand, increased by 68.6%. This resulted in a smaller net loss of RMB 11.8 million in the second quarter of 2018 compared to net loss of RMB30.2 million in the same quarter last year which demonstrates the strong scalability of our business model”.

Second Quarter 2018 Financial Results

Revenues were RMB165.1 million (US$25.0 million), an increase of 233.6% from RMB49.5 million in the same quarter of last year, mainly due to an increase in the number of customers by 37.5% from 1,165 in the three months ended June 30, 2017 to 1,602 during the second quarter of 2018, and an increase in average spending per customer by 142.5% from RMB42,500 to RMB103,100 during the second quarter of 2018.

Cost of revenues was RMB118.1 million (US$17.8 million), an increase of 192.8% from RMB40.3 million in the second quarter of 2017. The increase was in line with revenue growth and was mainly due to the increases in the cost of media inventory by RMB72.8 million, bandwidth cost by RMB2.3 million, staff cost by RMB1.1 million and depreciation of servers by RMB0.7 million.

Gross profit was RMB47.0 million (US$7.1 million), an increase of 411.0% from RMB9.2 million year-over-year, mainly due to the significant revenue growth within the same period.

Total operating expenses were RMB68.7 million (US$10.4 million), an increase of 68.6% from RMB40.7 million in the same quarter of last year.

Loss from operations was RMB21.7 million (US$3.3 million), compared with RMB31.6 million in the same quarter of last year.

Net Loss was RMB11.8 million (US$1.8 million), compared with RMB30.2 million in the same quarter of last year.

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Adjusted net loss (non-GAAP) was RMB17.1 million (US$2.6 million), compared with RMB27.7 million for the same period of last year.

Adjusted EBITDA (non-GAAP) was negative RMB11.1 million (US$1.7 million) compared with negative RMB27.5 million for the same period of last year.

As of June 30, 2018, the Company had cash and cash equivalents and restricted cash of RMB243.9 million (US$36.9 million), compared with RMB208.2 million as of December 31, 2017.

Business Outlook

For the third quarter of 2018, the Company expects total revenues to be between RMB180 million and RMB185 million, representing year-over-year growth of approximately 97.4% to 102.9%.

The above outlook is based on the current market conditions and reflects the Company’s current and preliminary estimates of market and operating conditions and customer demand, which are all subject to change.

Conference Call

The Company will host a conference call to discuss the earnings at 9:00 p.m. Eastern Time on Thursday, September 6, 2018 (9:00 a.m. Beijing time on Friday, September 7, 2018).

Dial-in numbers for the live conference call are as follows:

A telephone replay of the call will be available after the conclusion of the conference call through 9:00 a.m. U.S. Eastern Time, September 14, 2018.

Dial-in numbers for the replay are as follows:

A live and archived webcast of the conference call will be available on the Investor Relations section of Aurora Mobile’s website at http://ir.jiguang.cn/.

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Use of Non-GAAP Financial Measures

In evaluating the business, the Company considers and uses two non-GAAP measures, adjusted net loss and adjusted EBITDA, as a supplemental measures to review and assess its operating performance. The presentation of these non-GAAP financial measures is not intended to be considered in isolation or as a substitute for the financial information prepared and presented in accordance with U.S. GAAP. The Company defines adjusted net loss as net loss excluding share-based compensation and change in fair value of derivative liability. The Company defines adjusted EBITDA as net loss excluding interest expense, depreciation of property and equipment, amortization of intangible assets, income tax (expense) benefit, share-based compensation and change in fair value of derivate liability.

The Company believes that adjusted net loss and adjusted EBITDA help identify underlying trends in its business that could otherwise be distorted by the effect of certain expenses that it includes in loss from operations and net loss.

The Company believes that adjusted net loss and adjusted EBITDA provide useful information about its operating results, enhance the overall understanding of its past performance and future prospects and allow for greater visibility with respect to key metrics used by the management in their financial and operational decision-making.

The non-GAAP financial measures are not defined under U.S. GAAP and are not presented in accordance with U.S. GAAP. The non-GAAP financial measures have limitations as analytical tools. One of the key limitations of using adjusted net loss and adjusted EBITDA is that they do not reflect all items of income and expense that affect the Company’s operations. Further, the non-GAAP financial measures may differ from the non-GAAP information used by other companies, including peer companies, and therefore their comparability may be limited.

The Company compensates for these limitations by reconciling the non-GAAP financial measures to the nearest U.S. GAAP performance measure, all of which should be considered when evaluating the Company’s performance. The Company encourages you to review its financial information in its entirety and not rely on a single financial measure.

Reconciliations of the non-GAAP financial measures to the most comparable U.S. GAAP measure are included at the end of this press release.

Safe Harbor Statement

This announcement contains forward-looking statements. These statements are made under 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,” “future,” “intends,” “plans,” “believes,” “estimates,” “confident” and similar statements. Among other things, the Business Outlook and quotations from management in this announcement, as well as Aurora Mobile’s strategic and operational plans, contain forward-looking statements. Aurora Mobile 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 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 but not limited to statements about Aurora Mobile’s beliefs 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: Aurora Mobile’s strategies; Aurora Mobile’s future business development, financial condition and results of operations; Aurora Mobile’s ability to attract and retain customers; its ability to develop and effectively market data solutions, and penetrate the existing market for developer services; its ability maintain or enhance its brand; the competition with current or future competitors; its ability to continue to gain access to mobile data in the future; the laws and regulations relating to data privacy and protection; 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 the Company’s filings with the Securities and Exchange Commission. All information provided in this press release and in the attachments is as of the date of the press release, and Aurora Mobile undertakes no duty to update such information, except as required under applicable law.

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About Aurora Mobile Limited

Founded in 2011, Aurora Mobile is a leading mobile big data solutions platform in China, pioneered in providing mobile developer services such as push notification, instant messaging, analytics, sharing and short message service (SMS). Aurora Mobile has served approximately 344 thousand mobile app developers and approximately 888 thousand mobile applications, accumulated data from nearly 15 billion installations of the Company’s software development kits (SDKs), with monthly unique active device base of nearly 1 billion, as of June 2018. Based on Aurora Mobile’s vast data coverage and insights garnered, the Company has expanded its offerings into big data solutions, including targeted marketing, financial risk management, market intelligence and location-based intelligence. By utilizing artificial intelligence and machine learning, Aurora Mobile strives to help improve productivity for businesses and society through harnessing the power of mobile big data to derive actionable insights and knowledge.

For more information, please visit http://ir.jiguang.cn/

For investor and media inquiries, please contact:

Aurora Mobile Limited

ir@jiguang.cn

Christensen

In China

Mr. Christian Arnell

Phone: +86-10-5900-1548

E-mail: carnell@christensenir.com

In U.S.

Ms. Linda Bergkamp

Phone: +1-480-614-3004

Email: lbergkamp@ChristensenIR.com

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Footnote:

This announcement contains translations of certain RMB amounts into U.S. dollars at specified rates solely for the convenience of the reader. Unless otherwise noted, all translations from RMB to U.S. dollars are made at a rate of RMB6.6171 to US$1.00, the exchange rate set forth in the H.10 statistical release of the Board of Governors of the Federal Reserve System as of June 29, 2018.

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AURORA MOBILE LIMITED

UNAUDITED INTERIM CONDENSED CONSOLIDATED INCOME STATEMENTS

(Amounts in thousands of Renminbi (“RMB”) and US dollars (“US$”))

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AURORA MOBILE LIMITED

UNAUDITED INTERIM CONDENSED CONSOLIDATED INCOME STATEMENTS (continued)

(Amounts in thousands of Renminbi (“RMB”) and US dollars (“US$”), except for number of shares and per share data)

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AURORA MOBILE LIMITED

UNAUDITED INTERIM CONDENSED CONSOLIDATED BALANCE SHEET

(Amounts in thousands of Renminbi (“RMB”) and US dollars (“US$”))

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AURORA MOBILE LIMITED

UNAUDITED INTERIM CONDENSED CONSOLIDATED BALANCE SHEET (continued)

(Amounts in thousands of Renminbi (“RMB”) and US dollars (“US$”), except for number of shares and per share data)

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AURORA MOBILE LIMITED

RECONCILIATION OF GAAP AND NON-GAAP RESULTS

(Amounts in thousands of Renminbi (“RMB”) and US dollars (“US$”))

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