South Korean AI Chip Startup Rebellions Raises $400 Million at $2.3 Billion Valuation

The South Korean government's newly formed National Growth Fund made its first direct investment in any startup by committing 250 billion won (roughly $180 million) to Rebellions, the AI chip company that disclosed a $400 million pre-IPO round Monday at a valuation of $2.34 billion.

The round, co-led by Mirae Asset Financial Group, brings Rebellions' total capital raised to $850 million since its 2020 founding. The velocity of that accumulation is notable: $650 million arrived in just six months, following a $250 million Series C in November 2025 that valued the company at $1.4 billion and a $124 million Series B closed in 2024. The National Growth Fund's stake, made under its "Mega Projects" initiative for industries critical to Korea's national future, marks the first direct equity commitment the fund has made since it was established. Korea Development Bank separately contributed an additional 50 billion won.

Rebellions designs chips specifically for AI inference, the compute layer that allows large language models to respond to real-time queries, and has positioned itself as a challenger to Nvidia's dominance in AI hardware. CEO and co-founder Sunghyun Park said the commercial maturation of AI models has concentrated competitive pressure on inference infrastructure and the software that makes it deployable at scale, an area where the company sees a structural opening. Rebellions merged last year with Sapeon, another South Korean AI chip startup, creating a combined firm with deeper institutional backing and a broader product line.

Alongside Monday's funding announcement, Rebellions unveiled two new AI infrastructure platforms: RebelPOD, described as a production-ready unit of inference compute, and RebelRack, a scalable cluster system built for large-scale AI deployment. The company has been working with Samsung to commercialize Rebel-Quad, its second-generation chip system composed of four Rebel AI chips built on a UCIe-Advanced chiplet architecture with 144GB of HBM3E memory, which launched in May 2025.

Chief Business Officer Marshall Choy, appointed in November 2025 to lead the company's international push, said Rebellions has established entities in the United States, Japan, Saudi Arabia, and Taiwan. In the U.S., the company is targeting cloud providers, government agencies, telecommunications operators, and Neoclouds. Rebellions' existing investor roster spans Samsung, SK Hynix, SK Telecom, Korea Telecom, Saudi Aramco, Kindred Ventures, and Top Tier Capital.

The company is planning a domestic IPO in South Korea, with a listing targeted for the second half of 2026 and early 2027 as the latest possible window.