4556.T jumps 23% pre-market to ¥1,604 (JPX) 10 Feb 2026: watch RSI

We see 4556.T stock surge 23.01% in pre-market trading on 10 Feb 2026, trading at ¥1,604.00 on the JPX. The move makes KAINOS Laboratories, Inc. one of today’s top gainers in Japan’s healthcare segment. Volume is modest at 3,500 shares versus an average of 3,686, so the price jump likely reflects concentrated buying and momentum rather than broad market liquidity.