Sina Corporation is a Chinese internet and online media company best known for operating the Sina.com portal and for its controlling interest in Weibo Corporation, which runs the microblogging platform Weibo. Sina was formed in March 1999 through the merger of Beijing SINA Information Technology and California‑based SINANET.com. It listed on Nasdaq in April 2000 and became a private company again when a go‑private transaction led by chairman Charles Chao closed on March 22, 2021. The company is incorporated in the Cayman Islands and is headquartered in Beijing.
Sina owns Sina Weibo, a Twitter-like microblog social network, which has 56.5 percent of the Chinese microblogging market based on active users and 86.6 percent based on browsing time over Chinese competitors such as Tencent and Baidu. As of June 2024, Weibo reported 583 million monthly active users.
Sina App Engine (SAE) is the earliest and largest PaaS platform for cloud computing in China. It is run by SAE Department, which was founded in 2009. SAE is dedicated in providing stable, effective web deployment and hosting service for those corporations, organizations and independent developers. More than 300,000 developers in China use the SAE.