** Hong Kong shares of China's top foundry SMIC 0981.HK climb 4% to HK$72.3, on track for the biggest one-day pct gain since Dec 22
** Fifth biggest pct gainer in Hang Seng TECH Index .HSTECH, which is up 1%
** Shanghai-listed stock 688981.SS gains 1.6% to 124.45 yuan, set for the biggest one-day pct rise since Dec 24
** SMIC said on Monday that it plans to acquire the remaining 49% stake in unit SMNC for 40.6 billion yuan ($5.79 billion), giving it full control of the unit
** The deal will be executed through issuing 547.2 million A-shares to five SMNC shareholders, including China's National Integrated Circuit Industry Investment Fund, SMIC said in a filing to the Shanghai Stock Exchange.
** YTD, Hong Kong shares up 126.7%, Shanghai stock up 31.5%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))