Down 14.04% pre-market: Welby Inc. (4438.T JPX) at JPY 355.00 on 18 Mar 2026, near-term risk

The 4438.T stock plunged 14.04% to JPY 355.00 pre-market on 18 Mar 2026, leaving Welby Inc. among Tokyo’s biggest losers. The move follows a gap lower from a Previous Close of JPY 413.00 and heavier-than-normal volume at 205,400.00 shares. Traders cite stretched valuation metrics and weak recent earnings metrics as immediate pressure points for the JPX-listed health-tech name.