Simtex shares jumped more than 16% on a single day, September 22, closing at 148,100 KRW. As of September 29, the stock stood at 151,900 KRW, near its 52-week high. Yet the stock's P/E ratio shows a negative 30.7x—shares are rising, but the earnings metric is in negative territory. The pieces don't seem to fit. Here's why, by the numbers. Not a Solo Move The September 22 surge wasn't unique to Simtex. On the same day, Korea Circuit jumped 26%, and Daeduk Electronics rose 12%. The driver: demand for AI server substrates. The entire PCB sector moved together that day. But has momentum been evenly distributed recently? No. Over the past three months, Simtex is down 3.4%, compared to Daeduk Electronics down 14.8%, Korea Circuit down 16.8%, and Isupetasis down 11.0%. The median among three peers is negative 14.8%. Simtex alone held near flat. Over a year, Simtex is up 366.7%, Daeduk Electronics 392.0%, and Korea Circuit 354.0%. The entire sector caught the AI...