Hang Seng Index edged higher on Thursday's morning trade but retreated later and finished the day into negative area giving up 0.79% or 151.68 points to 19,025.27. Analysts associate the drop in the index with investor doubts over the outcome of EU summit. Heavyweight HSBC Holdings gained 1.6% on Reuters report the lender prepares to sold its stake in Indian financials Axis Bank Ltd. and Yes Bank Ltd valued at around USD 429.5 million. Technologies sector posted the biggest drop for the index slipping 2.8%.