KOSPI Surpasses 3,344 in Early Trading...Sets Another All-Time High (Update)
by Lee Minwoo
Published 11 Sep.2025 09:25(KST)
Updated 11 Sep.2025 09:26(KST)
Record Highs for Two Consecutive Days
Expectations for Easing of Major Shareholder Capital Gains Tax
AI-Related Stocks Rally in U.S. Markets Also a Positive Factor
The KOSPI surpassed the 3,344 mark, setting new all-time highs for consecutive days. Expectations for a relaxation of the major shareholder capital gains tax threshold and positive sentiment from artificial intelligence (AI) momentum in the U.S. stock market appear to have acted as favorable factors.
On September 11, the KOSPI opened at 3,336.60, up 0.67% from the previous day. This opening broke through the previous intraday all-time high of 3,317.77 set the day before. Shortly after the market opened, the index climbed further to reach 3,344.70, surpassing the 3,340 mark for the first time in history.
By investor type, both individual and institutional investors showed strong net buying, purchasing 35.1 billion won and 11.3 billion won worth of shares, respectively. In contrast, foreign investors recorded a net selling of 11.8 billion won.
The ratio of rising to falling sectors was similar. Electrical and electronics (1.63%), transportation equipment and parts (1.17%), and manufacturing (1.07%) sectors rose, while securities (-0.73%), insurance (-0.52%), and non-metallic minerals (-0.41%) sectors declined.
Among the top 10 stocks by market capitalization, most showed gains. LG Energy Solution (2.7%), SK Hynix (2.5%), and Hanwha Aerospace (1.7%) were particularly strong performers. Only KB Financial Group (-1.7%) and Doosan Enerbility (-0.4%) posted declines.
The KOSDAQ opened at 834.68, up 0.20% from the previous day. After rising to 836.11, the momentum slowed, and as of 9:12 a.m., the index had dropped to 833.80, lower than the opening level.
In the KOSDAQ market, foreign and institutional investors recorded net selling of 62.2 billion won and 21 billion won, respectively. Only individual investors posted net buying of 97.1 billion won.
By sector, the metals sector showed a notable increase of 3.79%. This was followed by transportation equipment and parts (0.89%), medical and precision instruments (0.75%), and electrical and electronics (0.53%). General services (-1.00%), pharmaceuticals (-0.59%), and entertainment and culture (-0.39%) sectors declined.
Among the top 10 KOSDAQ stocks by market capitalization, more stocks declined than rose. Biotech stocks such as ABL Bio (-3.0%), Alteogen (-2.2%), LegoChem Biosciences (-1.9%), Samchundang Pharm (-1.8%), and Peptron (-1.5%) saw the largest drops. Only three stocks-PharmaResearch (1.6%), Ecopro BM (0.6%), and HLB (0.1%)-recorded gains.
Multiple favorable factors appear to have contributed to the rally, including AI-related momentum from Oracle in the U.S., increased funding for the National Growth Fund, and expectations for tax reform. On September 10 (local time), Oracle surged 36% in the U.S. market on optimism over AI-related order backlogs. Nvidia (3.83%) and Broadcom (9.77%) also posted strong gains. In Korea, President Lee Jaemyung is expected to announce tax reforms, including changes to the major shareholder capital gains tax threshold, at a press conference marking his 100th day in office.
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