NGK stock has been grinding lower for a month, with the share price down about 27% over 30 days, even as the latest quarter quietly reset the earnings bar. The headline is simple. Q1 2027 basic earnings per share came in at ¥103.25 and net income reached ¥29.37b on revenue of ¥184.15b. That profit print sits well above the recent quarterly run rate. The market is still trading NGK on an elevated P/E of 22x, so today’s move appears more like a valuation mood swing than a clear verdict on the earnings power just reported.

Is NGK a quality stock that the market is overpaying for, or is this recent slide quietly resetting expectations to a more reasonable entry point? Compare the current share price against our detailed valuation…