Normal 0 false false false MicrosoftInternetExplorer4 SINA (NASDAQ: SINA) added 10.1% to $49.64 early Monday. Alibaba Group is planning to acquire a stake in Sina's Weibo, according to China Business News. Share volume was 3.4 million, compared to a daily average of 2.9 million /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}