[QuickLinks -- Click here to rapidly navigate through this document SINA Corporation Announces Proposed Offering of US$600 Million Convertible Senior Notes and SHANGHAI, November 14, 2013 —SINA Corporation (NASDAQ: SINA) ("SINA" or the "Company"), a leading Internet media company serving China and the global Chinese communities, today announced that it proposes to offer up to US$600 million in aggregate principal] [QuickLinks -- Click here to rapidly navigate through this document MANAGEMENT'S DISCUSSION AND ANALYSIS OF We issued interim financials for the nine months ended September 30, 2013 and 2012 to certain investors in conjunction with our convertible bond offering. These financials are available to all shareholders upon request. Overview We are an Internet media company serving China and the global] [QuickLinks -- Click here to rapidly navigate through this document AMENDMENT NO. 2 (1) TO RIGHTS AGREEMENT Company Rights Agent This AMENDMENT NO. 2 (this "Amendment"), dated as of November , 2013, is made by and between SINA Corporation, a Cayman Islands exempted company (the " R E C I T A L S A. Rights Agreement B. The Board] [FORM 6-K SINA Corporation 37F, Jin Mao Tower ý o Form 20-F o o TABLE OF CONTENTS Press Release regarding Launching of the Proposed Offering of Convertible Senior Notes Management's Discussion and Analysis of Financial Condition and Results of Operations Form of Amendment No. 2 to Rights Agreement]