Samsung and SK Hynix KOSPI Weight Drops to 51.52% as Sectors Rotate

Samsung Electronics and SK Hynix saw their combined weight in the KOSPI index decrease to 51.52% on that day, down from 54.04% last month on the 31st, according to Korea Exchange. The decline occurred as non-semiconductor sectors experienced rotation buying over three trading days. The KOSPI's total market cap stood at 5,442.572 trillion won on that day.

Samsung Electronics and SK Hynix Market Cap Weight Drops to 51.52%

The two semiconductor companies still accounted for over half of the KOSPI's market capitalization on that day, but the decrease from the 54.04% recorded last month on the 31st marked a notable shift. Over the three trading days, the KOSPI index fluctuated around the 6,500 level, closing at 6598.26 on that day—nearly identical to its July 31st close of 6595.45. During this period, Samsung Electronics and SK Hynix declined 3% and 6% respectively, following a surge last month on the 31st when SK Hynix hit the daily price limit and Samsung Electronics jumped 27%.

Defense and Shipbuilding Sectors Record Double-Digit Gains

Non-semiconductor sectors that had been overshadowed by the semiconductor concentration showed broad gains over the three trading days. The KRX K-AI Defense TOP5+ index surged 14%, while the KRX Shipbuilding TOP10 index rose over 6%. Individual stocks also posted strong performances: Naver gained 10.09% (IT software sector), Samyang Foods rose 3.59% (food and beverage), Hyosung Heavy Industries climbed 23.50% (electrical equipment), and APR increased 11.7% (cosmetics). These gains occurred in sectors previously underweighted due to the semiconductor concentration.

Analyst Forecasts Return to Pre-Leverage Regulation Levels

Lee Kyung-min, a researcher at Daishin Securities, stated that the concentration of Samsung Electronics and SK Hynix within KOSPI peaked at 58.9% on June 25 and has been declining since, returning to the 50.2% level seen before single-stock leverage products were introduced. Lee added that after the semiconductor sector absorbs selling pressure and concentration eases, Samsung Electronics and SK Hynix are expected to resume their upward trend, with undervalued and oversold non-semiconductor stocks anticipated to rise alongside them.

FAQ

What was the combined KOSPI weight of Samsung Electronics and SK Hynix on that day? Samsung Electronics and SK Hynix accounted for 51.52% of the KOSPI's total market capitalization on that day, down from 54.04% last month on the 31st.

Which sectors showed the strongest gains during the three trading days? The defense sector index (KRX K-AI Defense TOP5+) surged 14%, and the shipbuilding index (KRX Shipbuilding TOP10) rose over 6%. Individual stocks included Naver (10.09%), Hyosung Heavy Industries (23.50%), and APR (11.7%).

When did Samsung Electronics and SK Hynix reach their peak concentration in KOSPI? According to Daishin Securities researcher Lee Kyung-min, the two companies' combined KOSPI weight peaked at 58.9% on June 25.