Samsung SDI Shakes Off Volatility with Dual Push on Solid-State and US Defense Market

Samsung SDI’s stock staged a powerful recovery on Monday as investors cheered two strategic announcements that signal a clear direction for the battery maker. The shares initially jumped 8.51% to €71.40 after the company revealed a $20 million investment in US startup Forge Nano, before extending gains to nearly 10% at €72.60 as details of a broader national investment plan emerged.

The dual catalysts underscore a deliberate pivot: Samsung SDI is simultaneously advancing next-generation solid-state battery production in its home market while building a manufacturing foothold in the United States to tap the lucrative defence and aerospace sector.

Forging a US Supply-Chain Link

Samsung SDI has taken a $20 million equity stake in Forge Nano, a Colorado-based technology company. Together they will build a gigafactory in Morrisville, North Carolina, with an annual capacity of three gigawatt-hours. The plant is scheduled to start operations in 2028.

Forge Nano itself is pouring between $300 million and $330 million into the facility, supplemented by a $100 million grant from the US Department of Energy. Under the agreement, Samsung SDI will also purchase 250 megawatt-hours of battery cells from Forge Nano each year from 2028 onward, and in turn Forge Nano will become the official US distributor for Samsung SDI cells.

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The partnership is designed to bypass tightening US regulations that aim to exclude Chinese materials from military supply chains. By producing locally, Samsung SDI avoids import tariffs and gains direct access to the defence and aviation markets — a high-margin opportunity that has drawn increasing attention from battery manufacturers.

Home-Front Bet on Solid-State Technology

On the same day, Samsung chairman Jay Y. Lee presented a sweeping national investment plan for South Korea that funnels trillions of won into semiconductors, artificial intelligence and robotics over the next decade. Samsung SDI has been assigned a leading role in solid-state batteries and energy storage systems within this framework.

The Ulsan site will be transformed into a centre for the mass production of solid-state batteries, a technology widely seen as critical for the next wave of renewable energy and AI-related applications. Meanwhile, the Cheonan plant will serve as a global “mother factory” for developing future mobility and AI battery solutions. The group’s explicit goal is to secure technological leadership in advanced energy storage.

Stock in Context

Despite the sharp recovery, Samsung SDI’s shares remain 31% below the 52-week high of €103.50 hit in May. The stock has been volatile in recent weeks: the current level of €72.60 marks a rebound from a month-long slide that erased nearly 25% of its value. On a year-on-year basis, however, the equity is still up 84%.

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Technical indicators suggest the rally may have room to run. The relative strength index stood at 43 after Monday’s close, pointing to a slightly oversold condition following the pullback. The price also sits 24% above its 200-day moving average, confirming the longer-term uptrend remains intact even as short-term turbulence persists.

With a clear mandate from the Samsung conglomerate and a concrete entry point into the US defence market, Samsung SDI now faces the challenge of executing on both fronts. Investors will be watching closely for the first milestones — especially the capacity expansion at Ulsan and the construction timeline for the Morrisville gigafactory.

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