** Shares of WuXi Biologics (Cayman) Inc 2269.HK climb nearly 5% to HK$34.34, post their biggest intraday pct gain since April 14
** Stock hits its highest level since May 14, snaps two sessions of consecutive gains
** Stock is top pct gainer in the Hang Seng Biotech Index .HSBIO, which slips 1.4%
** The Chinese biologics discovery, development and manufacturing group plans to repurchase shares in the open market for up to $400 million
** Company says the current trading price of the shares does not reflect their intrinsic value or the actual business prospects of the company, and share repurchase will demonstrate its confidence in its own business outlook and prospects
** YTD, stock up 6.9%, while benchmark Hang Seng Index .HSI down 0.3%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))