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

Forthe month of April 2025

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 First Quarter 2025 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

HongKong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement,make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arisingfrom or in reliance upon the whole or any part of the contents of this announcement.

WeiboCorporation

微博股份有限公司

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

(StockCode: 9898)

DATEOF BOARD MEETING AND

DATEOF PUBLICATION OF FIRST QUARTER 2025 FINANCIAL RESULTS ANNOUNCEMENT

The board of directors (the “Board”) of Weibo Corporation (the “Company”) will hold a Board meeting on Tuesday, May 20, 2025 (Hong Kong time) for the purposes of, among other things, approving the Company’s unaudited financial results and announcement for the three months ended March 31, 2025 (“Q1 2025 Financial Results”). The Company will announce its Q1 2025 Financial Results on Wednesday, May 21, 2025 (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, May 21, 2025 (Hong Kong time) to discuss the Q1 2025 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/BIbb5c504e4aeb43a380f69d373cfb8ca0

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

Hong Kong, April 25, 2025

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