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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

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of November 2017

Commission File Number: 001-36397

Weibo Corporation

(Registrant’s Name)

8/F, QIHAO Plaza, No. 8 Xinyuan S. Road

Chaoyang District, Beijing 100027

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 o

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): o

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): o

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Press Release regarding Financial Results of Third Quarter Ended September 30, 2017 Issued by Weibo Corporation on November 7, 2017

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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.

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Exhibit 99.1

Weibo Reports Third Quarter 2017 Financial Results

BEIJING, China — November 7, 2017 — Weibo Corporation (“Weibo” or the “Company”) (NASDAQ: WB), a leading social media in China, today announced its unaudited financial results for the third quarter ended September 30, 2017.

Third Quarter 2017 Highlights

·                  Net revenues totaled $320.0 million, an increase of 81% year-over-year, exceeding the Company’s guidance between $290 million and $300 million.

·                  Advertising and marketing revenues were $276.8 million, an increase of 77% year-over-year.

·                  Other revenues were $43.2 million, an increase of 114% year-over-year.

·                  Net income attributable to Weibo was $101.1 million, an increase of 215% year-over-year, and diluted net income per share was $0.45, compared to $0.14 for the same period last year.

·                  Non-GAAP net income attributable to Weibo was $115.2 million, an increase of 111% year-over-year, and non-GAAP diluted net income per share was $0.51, compared to $0.24 for the same period last year.

·                  Adjusted EBITDA was $135.9 million, an increase of 136% year-over-year, or 42% of net revenues, compared to 33% for the same period last year.

·                  Monthly active users (“MAUs”) had a net addition of approximately 79 million users year over year and reached 376 million in September 2017. Mobile MAUs represented 92% of MAUs.

·                  Average daily active users (“DAUs”) had a net addition of approximately 33 million users year over year and reached 165 million in September 2017.

“We have made a number of breakthroughs in the areas of expanding ad customer base, improving ad system efficiency as well as developing innovative marketing solutions. These achievements in turn allowed us to drive robust topline and bottom line growth in the third quarter across all business sectors.” said Gaofei Wang, CEO of Weibo. “More importantly, I’m happy to see that we are increasingly creating a virtuous cycle of growth on Weibo by translating user base expansion and engagement growth into stronger monetization capabilities.”

Third Quarter 2017 Financial Results

For the third quarter of 2017, Weibo reported net revenues of $320.0 million, compared to $176.9 million for the same period last year. Advertising and marketing revenues totaled $276.8 million, compared to $156.7 million for the same period last year, and advertising and marketing revenues from small & medium-sized enterprises (“SMEs”) and key accounts were $251.5 million, compared to $147.4 million for the same period last year. Other revenues totaled $43.2 million, compared to $20.2 million for the same period last year.

Costs and expenses for the third quarter of 2017 totaled $201.6 million, compared to $134.0 million for the same period last year. The increase in costs and expenses was primarily attributable to more marketing and development expenditures incurred and higher turnover tax costs (resulting from higher revenues). Non-GAAP costs and expenses were $188.0 million, compared to $122.4 million for the same period last year.

Income from operations for the third quarter of 2017 was $118.5 million, compared to $42.9 million for the same period last year. Non-GAAP income from operations was $132.0 million, compared to $54.5 million for the same period last year.

Non-operating income for the third quarter of 2017 was $4.3 million, compared to a non-operating loss of $9.2 million for the same period last year. Non-operating loss for the third quarter of 2016 mainly resulted from $11.1 million impairment on investments, which was excluded under non-GAAP measures. Income tax expenses were $22.0 million, compared to $1.9 million for the same period last year. The increase was primarily due to higher profitability and the change in tax status of the Company’s PRC subsidiary in 2017 from being fully tax exempted to being subject to a reduced enterprise income tax rate of 12.5%.

Net income attributable to Weibo for the third quarter of 2017 was $101.1 million, or diluted net income per share of $0.45, compared to $32.1 million for the same period last year, or diluted net income per share of $0.14. Non-GAAP net income attributable to Weibo for the third quarter of 2017 was $115.2 million, or diluted net income per share of $0.51, compared to $54.6 million for the same period last year, or diluted net income per share of $0.24.

As of September 30, 2017, Weibo’s cash, cash equivalents and short-term investments totaled $737.0 million. For the third quarter of 2017, cash provided by operating activities was $110.6 million, capital expenditures totaled $4.4 million, and depreciation and amortization expenses amounted to $3.9 million.

Other Developments

Completion of Offering of Convertible Senior Notes

On October 30, 2017, the Company completed the offering of $900 million in aggregate principal amount of convertible senior notes due 2022, including a fully-exercised over-allotment option of $100 million principal amount of notes that the Company granted to the initial purchasers (the “Notes”). The Notes will bear annual interest at a rate of 1.25% per year, payable semiannually in arrears on May 15 and November 15 of each year, beginning on May 15, 2018. The Notes will be convertible into Weibo’s American Depositary Shares (“ADS”) based on an initial conversion price of approximately US$133.27 per ADS, which represents an approximately 47.5% conversion premium over the closing trading price of Weibo’s ADSs on October 25, 2017. The Notes will mature on November 15, 2022, unless previously repurchased, redeemed or converted in accordance with their terms prior to such date.

Annual General Meeting

On November 2, 2017, the Company held its annual general meeting of shareholders, where the shareholders re-elected each of Mr. Charles Chao and Mr. Daniel Yong Zhang as a director of Weibo.

Business Outlook

For the fourth quarter of 2017, Weibo estimates that its net revenues to be between $355 million and $365 million, which assumes an average exchange rate of 6.70 RMB to US$1.00. This forecast reflects Weibo’s current and preliminary view, which is subject to change.

Conference Call

Weibo’s management team will host a conference call from 6 AM — 7 AM Eastern Time on November 7 2017 (or 7 PM — 8 PM Beijing Time on November 7, 2017) to present an overview of the Company’s financial performance and business operations. A live webcast of the call will be available through the Company’s corporate website at http://ir.weibo.com. The conference call can be accessed as follows:

US Toll Free:  +1 866-519-4004

Hong Kong Toll Free:  800-906-601

China Toll Free:  400-620-8038

International:  +65 6713-5090

Passcode for all regions:  6698249

A replay of the conference call will be available from 10:00 AM Eastern Time on November 7, 2017-9:00 AM Eastern time on November 15, 2017. The dial-in number is +61 2-8199-0299. The passcode for the replay is 6698249.

Non-GAAP Financial Measures

This release contains the following non-GAAP financial measures: non-GAAP costs and expenses, non-GAAP income from operations, non-GAAP net income attributable to Weibo, non-GAAP diluted net income per share attributable to Weibo and adjusted EBITDA. These non-GAAP financial measures should be considered in addition to, not as a substitute for, measures of the Company’s financial performance prepared in accordance with U.S. GAAP.

The Company’s non-GAAP financial measures exclude stock-based compensation, amortization of intangible assets, net results of gain on the sale of investments and impairment on investments, non-GAAP to GAAP reconciling items for the loss attributable to non-controlling interests, and provision for income tax related to the amortization of intangible assets (other non-GAAP to GAAP reconciling items have no tax effect). Adjusted EBITDA excludes interest income, net, income tax expenses, and depreciation expenses. The Company’s management uses these non-GAAP financial measures in their financial and operating decision-making, because management believes these measures reflect the Company’s ongoing operating performance in a manner that allows more meaningful period-to-period comparisons. The Company believes that these non-GAAP financial measures provide useful information to investors and others in the following ways: (i) in comparing the Company’s current financial results with the Company’s past financial results in a consistent manner, and (ii) in understanding and evaluating the Company’s current operating performance and future prospects in the same manner as management does, if they so choose. The Company also believes that the non-GAAP financial measures provide useful information to both management and investors by excluding certain expenses, gains (losses) and other items (i) that are not expected to result in future cash payments or (ii) that are non-recurring in nature or may not be indicative of the Company’s core operating results and business outlook.

Use of non-GAAP financial measures has limitations. The Company’s non-GAAP financial measures do not include all income and expense items that affect the Company’s operations.  They may not be comparable to non-GAAP financial measures used by other companies.  Accordingly, care should be exercised in understanding how the Company defines its non-GAAP financial measures. Reconciliations of the Company’s non-GAAP financial measures to the nearest comparable GAAP measures are set forth in the section below titled “Unaudited Reconciliation of Non-GAAP to GAAP Results.”

About Weibo

Weibo is a leading social media for people to create, share and discover Chinese-language content. It provides an unprecedented and simple way for people and organizations to publicly express themselves in real time, interact with others and stay connected with the world. Any user can post a feed and attach multi-media or long-form content. User relationships on Weibo may be asymmetric; any user can follow any other user and add comments to a feed while reposting. This simple, asymmetric and distributed nature of Weibo allows an original feed to become a live viral conversation stream.

Weibo enables its advertising and marketing customers to promote their brands, products and services to users. Weibo offers a wide range of advertising and marketing solutions to its customers, ranging from large companies to small and medium-sized enterprises to individuals. The Company generates a substantial majority of revenues from the sale of advertising and marketing services, including the sale of social display ads and promoted feeds. Weibo has developed and is continuously refining its social interest graph recommendation engine, which enables its customers to perform people marketing and target audiences based on user demographics, social relationships, interests and behaviors, to achieve greater relevance, engagement and marketing effectiveness.

Safe Harbor Statement

This press release contains forward-looking statements that relate to, among other things, Weibo’s expected financial performance and strategic and operational plans (as described, without limitation, in the “Business Outlook” section and in quotations from management in this press release. Weibo may also make forward-looking statements in the Company’s periodic reports to the U.S. Securities and Exchange Commission (“SEC”), 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 the Company’s beliefs and expectations, are forward-looking statements. These forward-looking statements can be identified by terminology, such as “will,” “expects,” “anticipates,” “future,” “intends,” “plans,” “believes,” “confidence,” “estimates” and similar statements. Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statement. Potential risks and uncertainties include, but are not limited to, Weibo’s limited operating history in certain new businesses; failure to grow active user base and the level of user engagement; the uncertain regulatory landscape in China; fluctuations in the Company’s quarterly operating results; the Company’s reliance on advertising and marketing sales for a majority of its revenues; failure to successfully develop, introduce, drive adoption of or monetize new features and products; failure to compete effectively for advertising and marketing spending; failure to successfully integrate acquired businesses; risks associated with the Company’s investments, including equity pick-up and impairment; failure to compete successfully against new entrants and established industry competitors; changes in the macro-economic environment, including the depreciation of the Renminbi; and adverse changes in economic and political policies of the PRC government and its impact on the Chinese economy. Further information regarding these and other risks is included in Weibo’s annual report on Form 20-F for the fiscal year ended December 31, 2016 filed with the SEC on April 27, 2017 and other filings with the SEC. All information provided in this press release is current as of the date hereof, and Weibo assumes no obligation to update such information, except as required under applicable law.

Contact:

Investor Relations

Weibo Corporation

Phone: +86 10 5898-3017

Email: ir@staff.weibo.com

WEIBO CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

WEIBO CORPORATION

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands)

WEIBO CORPORATION

UNAUDITED RECONCILIATION OF NON-GAAP TO GAAP RESULTS

(In thousands, except per share data)

WEIBO CORPORATION

UNAUDITED RECONCILIATION OF NON-GAAP TO GAAP RESULTS

(In thousands, except per share data)

(a)  To exclude stock-based compensation.

(b)  To exclude amortization of intangible assets.

(c)  To exclude net results of gain on the sale of investments and impairment on investments.

(d)  To exclude non-GAAP to GAAP reconciling items for the loss attributable to non-controlling interests.

(e)  To exclude the provision for income tax related to item (b). Other non-GAAP to GAAP reconciling items have no income tax effect.

Most of the reconciliation items were recorded in entities in tax free jurisdictions hence no income tax implications.

For impairment on investments, valuation allowances were made for those differences the Company does not expect to realize the benefit in the foreseeable future.

WEIBO CORPORATION

UNAUDITED ADDITIONAL INFORMATION

(In thousands)