Memory stocks dump lower following the huge setback in earlier South Korea market. 2 groups of traders right now - one taking profit and moving into value stocks, the other short selling these memory stocks knowing that the supply bottleneck remains for another year or two. Whatever the case might be, it shows the volatility of owning these momentum stocks, and if you fomo at the highs, you would be left holding for long or forced to liquidate if you are using margins.