Samsung Electronics stock had its worst day in three weeks, and the other memory stocks are lower as well

Samsung Electronics stock had its worst day in three weeks on Monday as investors reacted to its shareholder return plan, souring the mood for other memory-chip making rivals.

Seoul stocks closed sharply lower Monday as disappointment over Samsung Electronics' shareholder return plan triggered a sell-off in semiconductors. The Korean won rose against the US dollar. The benchmark Korea Composite Stock Price Index (Kospi) dipped 215.99 points, or 3.12 percent, to 6,696.96. After opening lower,