News/Reuters/Santen Pharmaceutical Co Ltd - Bought Back 3.6 Million Own Shares…Santen Pharmaceutical Co Ltd - Bought Back 3.6 Million Own Shares Worth 3.69 Billion Yen In JanuaryFeb 1, 202307:06 UTC4536Santen Pharmaceutical Co Ltd 4536:SANTEN PHARMACEUTICAL CO LTD - BOUGHT BACK 3.6 MILLION OWN SHARES WORTH 3.69 BILLION YEN IN JANUARY