The stocks most heavily bought by high-return investors trading through Mirae Asset Securities (006800) on the 21st were SK hynix (000660), Orum Therapeutics (475830) and Samsung Electro-Mechanics (009150), in that order. Buying flowed into SK hynix as expectations for a recovery in the memory market resurfaced in the United States, while Samsung Electronics (005930), which rose more than 4%, topped the net selling list, showing a split in how investors are reading large-cap chip stocks.
According to Mirae Asset Securities, SK hynix was the most-bought stock through 11 a.m. among "stock market elites" — the top 1% of the brokerage's trading clients by investment return over the past month. SK hynix traded at 1.869 million won at that time, up 0.65% from the previous session. The stock swung to the top of the net buying list in a single day after leading net selling in the prior session.
The shift is attributed to the strength of chip stocks on U.S. markets last week. On the 18th, the yield on the 10-year U.S. Treasury note climbed back above 5%, but Micron rose 3.9% on expectations of higher memory prices. The Philadelphia Semiconductor Index also gained 2.3%. Hopes for improved earnings at memory makers outweighed concerns about interest rates, carrying through to buying of SK hynix in Korea.
Orum Therapeutics ranked second in net buying. The stock traded at 27,100 won, down 27.54%. Shares have fallen sharply for two consecutive sessions after Bristol Myers Squibb decided to halt development of BMS-986497, a candidate treatment for acute myeloid leukemia, but the top traders appear to have treated the drop as a buying opportunity. The suspension also ended a $180 million asset transfer agreement the two companies signed in 2023. Orum is not obliged to return the $100 million upfront payment it has already received, but the market views an additional $80 million in milestone payments as now unlikely.
Samsung Electro-Mechanics came third in net buying at 1.418 million won, up 2.16%. Expectations continue for improving supply and demand for multilayer ceramic capacitors (MLCC) and flip-chip ball grid arrays (FC-BGA) as artificial intelligence server deployments expand. iM Securities estimated the company's third-quarter operating profit at 650 billion won, 9% above market forecasts. Citing faster-than-expected margin gains in MLCC and package substrates, the brokerage raised its target price to 2.1 million won from 2 million won.
Samsung Electronics, by contrast, topped the net selling list. The stock traded at 271,500 won, up 4.02%, suggesting investors used the advance to lock in profits. Sanil Electric (062040), Samsung Electronics preferred shares (005935), OCI Holdings (010060) and Hana Micron (067310) also ranked high in net selling. In the previous session, the most-bought stocks were Lotte Energy Materials (020150), TMC (217590) and Samsung Electronics preferred shares, while the most-sold were SK hynix, Doosan (000150) and CS Wind (112610).
Mirae Asset Securities compiles the trades of the top 1% of its clients by return over the past month and discloses them on its mobile trading system on a real-time, previous-day and five-day basis. The data is simple information unrelated to the brokerage's own views and does not guarantee investments or returns suited to any individual investor. Investors should note that theme stocks can be subject to abnormal price swings.
