SEOUL — South Korea’s secondary battery sector is witnessing a massive resurgence. Shares of industry giants Samsung SDI and LG Energy Solution surged more than 5% in pre-market trading on Wednesday, fueled by strengthening ties with German luxury automaker Mercedes-Benz.

Strategic Partnerships Drive Bull Run
According to Nextrade pre-market data, Samsung SDI rose by 34,000 KRW (5.27%) to 679,000 KRW, while LG Energy Solution climbed 25,000 KRW (5.23%) to hit 503,000 KRW.

The rally follows official statements from Mercedes-Benz regarding deep-rooted partnerships with Korean battery manufacturers. The German automaker has reportedly secured:

Samsung SDI: Supply contracts for high-performance NCM (Nickel-Cobalt-Manganese) batteries.
LG Energy Solution: Supply contracts for cost-efficient LFP (Lithium Iron Phosphate) batteries.
Additionally, Samsung Electro-Mechanics maintained its explosive momentum, rising 5%. The company has seen its stock price skyrocket by over 100% this month alone, driven by a surge in demand for MLCCs (Multi-Layer Ceramic Capacitors) used in AI and automotive electronics.

KOSPI Breaks Historical Records
The broader market context is equally historic. As of April 21, the KOSPI index recorded a monthly gain of 26%, marking the second-highest monthly growth since data collection began in 1995. The only period showing higher growth was February 1998 (51%), immediately following the IMF crisis.

Analysts Warn of Potential Sector Rotation
Despite the euphoria, financial experts are advising caution as the market enters a phase of potential profit-taking and sector rotation. While battery and AI components are soaring, other heavyweights like Hyundai Motor, Hyundai Mobis, and Samsung C&T slipped by approximately 1%, while Samsung Electronics and SK Hynix remained flat.

"The continuous rally has created short-term fatigue. We expect the market to undergo a rotation phase as investors digest gains," noted Han Ji-young, a strategist at Kiwoom Securities.
Han emphasized that while the KOSPI’s surge is backed by strong annual earnings momentum, the focus must now shift to the upcoming Q1 earnings season. The sustainability of this rally will depend on whether key sectors—including semiconductors, defense, and power equipment—can demonstrate continued earnings growth through the second quarter and beyond.