** Hong Kong shares of Chinese data centre group GDS Holdings 9698.HK drop 12% to HK$24.2, their lowest since April 30
** Stock set for the biggest one-day pct decline since April 7; top loser on index tracking information technology firms .HSCIIT, which is up 0.2%
** U.S.-listed stock GDS.O fell 4.8% on Tuesday
** GDS has launched an up to $631 million convertible bond and capital raising, according to a regulatory filing, with the money raised for working capital and to pay down existing debt
** Co has increased a seven-year convertible bond from $450 mln to $500 mln and is also selling 5.2 mln American Depository Shares (ADS) to raise up to $131 mln
** Hang Seng Tech Index .HSTECH slips 0.3%, Hang Seng Index .HSI eases 0.1%
** YTD, Hong Kong stock up 6.6%, U.S. shares up 14.2%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))