4596.T Kubota Pharma (JPX) Jan 2026 after hours: +19.28% Phase III watch

4596.T stock jumped 19.28% to JPY 99.00 in after hours trading on 29 Jan 2026 on heavy volume, marking one of the top gainer moves on the JPX. The move followed elevated trading with 22,505,100 shares changing hands versus an average volume of 2,209,047. Investors are linking the surge to renewed attention on Kubota Pharmaceutical Holdings Co., Ltd.’s clinical pipeline and retail momentum ahead of an earnings date in February.