South Korean AI chip startup Rebellions has closed a $400 million Series D round, pushing its total funding since its 2020 founding past $850 million and lifting its valuation to $2.34 billion. According to The Next Platform, the round was led by Mirae Asset Financial Group, which contributed roughly $199 million, with South Korea's National Growth Fund adding $166 million and Korea Development Bank chipping in $33 million.
The company is calling it a "pre-IPO" round, signaling ambitions to go public. It follows a $250 million Series C in September 2025 that was anchored by chip giant Arm, which remains both an investor and a technology partner — Rebellions uses Arm intellectual property in its host processors.
The fresh capital is earmarked for scaling production of Rebellions' rack-scale inference systems. Its flagship Rebel100 compute engine packs 144 GB of HBM3E memory and delivers 4.8 terabytes per second of memory bandwidth per chip. Sixteen of those engines slot into a RebelRack, which together hit 16 petaflops of AI compute at FP8 precision while drawing just 5–7 kilowatts of power. According to The Next Platform, customers can string up to 16 racks together — a configuration called a RebelPod — for a system housing up to 1,024 accelerators.
The architecture leans heavily on memory bandwidth rather than raw compute density, a bet reinforced by deep partnerships with South Korean memory giants SK Hynix and Samsung, according to EE Times. Rebellions is targeting cloud providers, telecoms, and AI labs in the United States that are hunting for a cost-effective alternative for running — rather than training — large AI models.
As AI inference costs become a major line item for every company deploying AI products, a credible challenger with a memory-first design and sovereign backing could meaningfully shift where and how the world runs its AI workloads.