tokyo dec 6 reuters  japanese shares fell on monday dragged down by a sharp decline in softbank group 9984t while investors remained risk averse as worries over the omicron variant of covid19 persisted the nikkei share average n225 fell 06 to 2787005 by 0215 gmt after opening 018 higher the broader topix topx was down 048 at 194843 the market has been volatile and will be so as long as investors seek details on the omicron variant said ikuo mitsui fund manager at aizawa securities but as for the japanese market today the declines are led by individual stocks particularly softbank group which is facing multiple negative factors softbank group tanked 711 losing half of its value from its yearhigh in midmarch on concerns over the valuations of portfolios in which the global technology startup investor in and its vision fund have invested didi global didin which is 215 owned by vision fund fell more than 22 on friday after the ridehailing giant said it would withdraw from the new york stock exchange and pursue a hong kong listing read more also the us federal trade commission sued to block us chip company nvidia corps nvdao more than 80 billion planned acquisition of british chip technology provider arm which is owned by softbank softbanks mobile phone company softbank corp 9434t reversed course to edge up 02 while z holdings 4689t  softbank corps internet business lost 281 other major technology shares gained limiting losses in the nikkei with phone company kddi 9433t 118 robot make fanuc 6954t 03 and airconditioning maker daikin industries 6367t 008