AI Data Center Battery Sees 400 Billion Won Market Cap Loss in One Day

EOS Energy Enterprises Inc. (NASDAQ: EOSE) closed at $12.22 on February 10, down 7.85%, on trading volume of approximately 9.5 million shares. Its market capitalization stands at about $4 billion (roughly KRW 5.3 trillion), with around $300 million (KRW 400 billion) wiped out in a single session.

The company’s shares have exhibited heightened volatility—swinging nearly double digits in a day—amid capital-raising concerns, including recent insider share sales and successive plans for convertible notes and equity issuances. At the same time, growing optimism for medium- to long-term growth is driven by the launch of an ultra-high-density, long-duration battery targeting AI data centers and military bases, as well as plans for a new factory in Pennsylvania to power data centers.

Headquartered in New Jersey, EOS Energy Enterprises designs and manufactures zinc-based, long-duration battery energy storage systems, supplying solutions for power grids and renewable energy projects that require four to 16+ hours of storage. In 2025, the company achieved record quarterly revenue and secured multi-hundred-megawatt, long-term contracts with major utilities and data center operators. Simultaneously, significant capital expenditures and a convertible note issuance have accelerated growth while raising dilution risk.