Rebellions Brand Guidelines: Korea’s Inference Chip Maker, ATOM & the Sapeon Merger

Founded in 2020 to design chips for inference.

Rebellions is a South Korean fabless semiconductor company: it designs processors for artificial intelligence and has them made by others. The company’s own timeline dates its founding to September 2020, “to push beyond the limits of general-purpose hardware,” with a plan to design chips for inference — running trained AI models — rather than for training them. English Wikipedia gives the same month and says it was started by five co-founders, among them the chief executive Sunghyun Park, the chief technology officer Jinwook Oh and the chief product officer Hyo-Eun Kim.

The company is based in Seongnam, in Gyeonggi Province, south of Seoul. The Korea Times, reporting through the Yonhap news agency in August 2024, described the signing of its merger agreement at “Rebellions’ office in Seongnam,” and the company’s website gives the same city, in the Bundang district. Wikipedia says Park, who trained at KAIST and MIT and later worked in the United States, considered starting the business there before choosing Korea for its semiconductor industry and engineers.

Its first chip was ATOM. The company says the ATOM system-on-chip, a GDDR6-based inference accelerator, was taped out in June 2022, and that its first units were delivered in May 2023 to kt cloud, the cloud arm of the telecoms group KT, for use in a working data centre. Wikipedia says ATOM is made on Samsung’s 5 nm process, and lists an ATOM-Max card that joins four ATOM chips on one board. Yonhap, in August 2024, described ATOM as an AI system-on-chip that supports large language models.

Funding came from Korea’s telecoms and chip groups. Wikipedia says KT led a Series B round in January 2024, and that later investors included SK Telecom, SK hynix, Samsung Electronics and Arm, as well as Wa’ed Ventures, the venture arm of Saudi Aramco.

Two Korean AI chip companies become one.

The defining event in the company’s short history is its merger with Sapeon Korea, the AI chip affiliate of the mobile operator SK Telecom. Yonhap described Sapeon Korea as having created Korea’s first AI chip for data centres in 2020. The two companies said in June 2024 that they would combine; they signed the definitive agreement on 18 August 2024 at Rebellions’ office in Seongnam, The Korea Times reported, and officials said the merged company would take the Rebellions name.

On 2 December 2024 company officials said the merger was complete, The Korea Times reported, about six months after the plan was announced. Park was to lead the combined business, which said it would work with strategic investors such as SK Telecom and SK hynix to expand into the United States, Saudi Arabia and Japan. Wikipedia says the merger made Rebellions the first Korean AI chip company valued as a “unicorn.” The company’s own timeline describes the merger as having “unified Korea’s AI semiconductor capabilities.”

The second-generation chip arrived the same autumn. The company says its REBEL system-on-chip was taped out in November 2024 and calls it the world’s first AI chiplet to use the UCIe-Advanced interconnect, joining chiplets with 144 GB of HBM3E memory. Wikipedia says the product, now sold as Rebel100, is made on Samsung’s 4 nm process; the company describes its core as “four chiplets acting as one die, designed for inference from the ground up.”

Rebellions does not present itself as a seller of bare chips. Its website groups the products as the Rebel family: RebelServer, RebelRack and RebelPOD, a turnkey system it says can be fitted into an existing data centre, with Rebel100 as the silicon underneath and a software stack that Wikipedia says supports open-source frameworks such as vLLM and Triton.

How the category presents itself.

AI chip companies sell something most of their customers will never see. The processor sits inside a server, the server sits in a rack, and the rack sits in a data hall far from the people who use the models running on it. So the industry’s visual language has grown up around making that hidden hardware visible: a whole silicon wafer, as wide as a dinner plate, held up on a keynote stage; a single chip pinched between finger and thumb for the cameras; a die shot recoloured in neon false colour so that its blocks of memory and compute read like a city map at night.

The second set of images is the data centre. Press photographs tend to show long rows of racks in dark halls, lit by the glow of status lights and cold aisles, with cabling arranged as neatly as a diagram. These pictures stand in for scale, which is what buyers of AI compute are being asked to imagine, and they appear again and again in launch announcements, partner news and investor material.

Keynote slides do much of the remaining work. Model names, token counts and benchmark charts appear beside the chip’s own product name, and the companies’ identities are usually kept spare to let those numbers and images lead: black or white grounds, a single accent colour, a sans-serif wordmark and very little ornament. Several firms have adopted coined product categories, names for their processors that set them apart from the graphics processor.

The shop window is the technical conference. Hot Chips, NeurIPS and the AI Infra Summit are among the events where architectures are presented, demonstrations run and booths compete for engineers’ attention. This guide looks at how each company in the group presents itself, and keeps to what can be checked about who founded it, who owns it and what it makes.

From Seongnam to Tokyo and Riyadh.

After the merger the company moved abroad. Its timeline lists the opening of Rebellions Japan, its first overseas branch, in February 2025, and a Saudi subsidiary in August 2025, which it links to a strategic investment from Aramco; its website also lists an American company, Rebellions America, in Santa Clara, California. Wikipedia records a Series C round in 2025 with Arm and Samsung taking part, and the company announced in October 2025 that it had joined Arm’s Total Design programme.

Partnerships have followed in software and telecoms. In December 2025 Rebellions and Red Hat announced a version of Red Hat OpenShift AI running on Rebellions NPUs, the company says. In March 2026 it said it had closed a pre-IPO funding round, in which Wikipedia says the Korean government’s National Growth Fund made its first direct investment, and launched RebelRack and RebelPOD. In July 2026 it said SK Telecom’s own large language model, A.X K1, was running on RebelServer, and in September 2026 it announced a partnership with ai& to bring its inference systems to Japan. Wikipedia names KT Cloud, SK Telecom and LG Electronics among its customers.

The way the company speaks about itself has widened with its range. Its website now calls the products the “Rebel family” and talks about full-stack inference infrastructure for enterprises, AI service providers and “national AI programs.” In December 2024 Park said, as The Korea Times reported, that “the reshaping of the global AI semiconductor market has already begun.”

For a design guide, Rebellions shows how a young chip company can build a family of product names — ATOM, then Rebel100, RebelServer, RebelRack and RebelPOD — around a single word. Compare Groq, another company built around AI inference, and d-Matrix. For this guide we use a night indigo, a deep violet and a pale lavender with a sans, an unofficial interpretation; no product or logo is reproduced.

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