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 July 2026

Commission File Number: 001-36397

Weibo Corporation

(Registrant’s Name)

8/F, QIHAO Plaza, No. 8 Xinyuan S. RoadChaoyang District, Beijing 100027People’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 x      Form 40-F ¨

Exhibit Index

Exhibit 99.1 — Announcement — Date of Board Meeting and Date of Publication of Second Quarter and Interim 2026 Financial Results Announcement

SIGNATURE

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.

Exhibit 99.1

Hong Kong Exchanges and Clearing Limited andThe Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to itsaccuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the wholeor any part of the contents of this announcement.

WeiboCorporation

微博股份有限公司

(A company controlledthrough weighted voting rights and incorporated in the Cayman Islands with limited liability)

(Stock Code: 9898)

DATEOF BOARD MEETING AND

DATEOF PUBLICATION OF SECOND QUARTER AND INTERIM 2026

FINANCIALRESULTS ANNOUNCEMENT

The board of directors (the “Board”) of Weibo Corporation (the “Company”) will hold a Board meeting on Wednesday, August 19, 2026 (Hong Kong time) for the purposes of, among other things, approving the Company’s unaudited financial results and announcement for the three months and six months ended June 30, 2026 (“Second Quarter and Interim 2026 Financial Results”). The Company will announce its Second Quarter and Interim 2026 Financial Results on Wednesday, August 19, 2026 (Hong Kong time) on the website of The Stock Exchange of Hong Kong Limited at www.hkexnews.hk and the Company’s website at http://ir.weibo.com, after the trading hours of The Stock Exchange of Hong Kong Limited and before the opening of the U.S. stock market.

The Company’s management team will host a teleconference call at 7 p.m. on Wednesday, August 19, 2026 (Hong Kong time) to discuss the Second Quarter and Interim 2026 Financial Results and answer questions. Participants who wish to dial in to the teleconference must register through the below public participant link. Dial-in and instruction will be in the confirmation email upon registering.

Pre-registration Link: https://register-conf.media-server.com/register/BI4542e6edec00491e9198327b87da5adb

Additionally, a live webcast of the conference call will be available at http://ir.weibo.com.

Hong Kong, July 29, 2026

As at the date of this announcement, the boardof directors of the Company comprises Mr. Charles Guowei Chao, Mr. Gaofei Wang, Ms. Hong Du and Mr. Bo Liu, as thedirectors, and Mr. Pochin Christopher Lu, Mr. Pehong Chen and Mr. Yan Wang as the independent directors.