Its shares traded at 512,000 won by midday, up 7.11 percent, or 34,000 won, from the previous session. The stock climbed as high as 522,000 won during intraday trading.
The company disclosed Friday after the market closed that it would sell its 15.2 percent stake in Samsung Display, in which it is a major shareholder, for about 4.45 trillion won ($3.2 billion).
While it did not specify how it will use the proceeds, investors expect some of the funds to go toward its North American battery business, including a battery plant under construction in New Carlisle, Indiana.
That investment is drawing attention because Samsung SDI is also seeking to expand its energy storage system, or ESS, business in the region. ESS batteries store electricity and release it when needed, and demand is expected to grow as AI data centers increase power consumption and put greater pressure on electricity grids.
Analysts said full ownership of Synergy Cells, which is developing the battery plant in Indiana, would allow Samsung SDI to keep all of the profits from the battery business instead of sharing them with its partner.
The optimism spread to other battery-related stocks. L&F surged 14.83 percent, while POSCO Future M rose 9.10 percent and SK Innovation gained 3.93 percent. LG Energy Solution advanced more than 4 percent.
The broader rally also reflected hopes that gains in the domestic stock market could spread beyond semiconductor shares into other sectors. Analysts also see ESS as a potential new growth driver for battery makers, even as electric vehicle demand remains relatively sluggish.
AJP Takeaways
• Samsung SDI shares traded at 512,000 won as of 11:13 a.m. on Aug. 24, 2026, up 7.11 percent, after rising as much as 9.21 percent to 522,000 won earlier in the session.
• Samsung SDI said on Aug. 21, 2026, that it would sell its stake in Samsung Display for about 4.45 trillion won ($3.2 billion), raising expectations that the proceeds could support battery investment in North America.
• Investors are focusing on Samsung SDI's energy storage system (ESS) business, as rising electricity demand from artificial intelligence data centers is expected to increase demand for large-scale battery storage.
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