- Cerebras filed to sell 28 million shares at $115-$125 each on May 4, 2026, raising up to $3.5 billion at a $26.6 billion market cap.
- Banks are fielding $10 billion in orders against the $3.5 billion offering, suggesting the price will land at or above the high end of the range.
- OpenAI loaned Cerebras $1 billion in December 2025, secured by warrants for over 33 million shares — meaning OpenAI may become a major shareholder through IPO conversion.
- OpenAI executives Sam Altman, Greg Brockman, Ilya Sutskever, and board member Adam D’Angelo hold personal angel investments; the Cerebras-OpenAI relationship was cited by Elon Musk’s attorneys in his ongoing OpenAI lawsuit.
What Happened
Cerebras Systems said on May 4, 2026 that it is preparing to sell 28 million shares at $115 to $125 a share, raising up to $3.5 billion and giving the company a $26.6 billion market cap at the high end. Banks are fielding $10 billion in orders against the $3.5 billion offering, per Bloomberg, which suggests pricing will land at or above the announced range. If priced at the high end, this would be the largest tech IPO of 2026 to date.
Why It Matters
Cerebras’s IPO is the most consequential public-markets test for AI-infrastructure companies in 2026. A successful blockbuster pricing would prove appetite for the larger AI IPOs in the wings — SpaceX, OpenAI, Anthropic — all of which have been rumored as potential 2026-2027 candidates. The Cerebras-OpenAI relationship adds a second layer: OpenAI’s December 2025 $1 billion loan to Cerebras is secured by warrants for over 33 million shares, meaning a successful IPO converts OpenAI into one of Cerebras’s largest shareholders. If priced at $125, those 33 million warrants would be worth roughly $4.1 billion at IPO close — a substantial gain on a $1 billion loan.
Technical Details
Cerebras’s Wafer-Scale Engine 3 is the company’s third-generation AI-specific chip, competing with GPU-based AI inference from Nvidia and AMD. The company says its chip is faster for inference workloads while using less power than GPU competitors. Cerebras’s most recent funding before the IPO was a $1 billion Series H in February at a $23 billion valuation, led by late-stage investors. Earlier in September 2025, Cerebras raised $1.1 billion at an $8.1 billion post-money led by Fidelity and Atreides — the valuation tripled in five months, supported by a multi-year agreement worth more than $10 billion with OpenAI signed in late 2025.
Top shareholders disclosed in the SEC filing (above 5% stake): Rick Gerson’s Alpha Wave; Benchmark via partner Eric Vishria; Lior Susan’s Eclipse; Fidelity; Foundation Capital via partner Steve Vassallo. Other named investors: 1789 Capital, Abu Dhabi Growth Fund, Abu Dhabi’s G42, Altimeter, AMD, Atreides Management, Coatue, Moore Strategic Ventures, Tiger Global, Valor Equity Partners, VY Capital. Angel investors include Sam Altman, Greg Brockman, Ilya Sutskever, Adam D’Angelo (OpenAI board member, Quora CEO), Andy Bechtolsheim (Sun Microsystems and Arista co-founder), and Intel CEO Lip-Bu Tan.
OpenAI’s $1 billion loan from December 2025 is secured by warrants allowing OpenAI to buy over 33 million shares. While Sam Altman’s personal stake was not disclosed in the SEC filing (presumably below the disclosure threshold), Altman is quoted in Cerebras’s S-1. The company had previously delayed a 2024 IPO attempt due to a federal review of G42’s investment, which remains a major customer.
Who’s Affected
Cerebras shareholders — particularly Series H investors at the $23 billion valuation — gain immediate substantial returns. OpenAI gains a potential $4 billion-plus equity position via warrant conversion, plus continued access to Cerebras silicon under the existing $10 billion+ multi-year agreement. Nvidia faces a credible public-market AI inference competitor for the first time at this scale. Sam Altman’s personal angel position adds to existing scrutiny in the Musk lawsuit, where Musk’s attorneys cited the Cerebras-OpenAI relationship as evidence that Musk was unaware of OpenAI executive personal investments. SpaceX, Anthropic, and OpenAI itself watch the pricing for their own IPO calculus.
What’s Next
Cerebras pricing at or above the $125 high end is widely expected given the $10 billion in orders. After IPO close, the OpenAI warrant conversion mechanics will be the most-watched element — when OpenAI exercises warrants, what dilution effect lands on other shareholders. Cerebras’s stock performance in the first 30 days will set the pricing context for subsequent AI infrastructure IPOs through summer 2026.
