South Korean retail investors net sold ₩5.212 trillion of Samsung Electronics and ₩7.818 trillion of SK Hynix between September 1 and 11, ending four months of simultaneous buying in both stocks. Foreign investors also sold ₩1.96 trillion of each company, extending their selling streak to five months since May. Corporate entities bought ₩4.658 trillion of Samsung Electronics and ₩9.89 trillion of SK Hynix, helping support prices as SK Hynix rose 8.24% and Samsung slipped 0.19% through September 11. The shift reflects profit-taking, weaker KOSPI momentum, regulatory scrutiny of single-stock leveraged ETFs, and rotation toward U.S. technology shares and Treasury-bill exposure rather than a clear rejection of the semiconductor cycle. Analysts continue to cite strong AI investment and memory demand, but warn that slowing earnings momentum, the need to monetize AI spending, and a stronger won could limit further gains.