Cerebras Systems' IPO bookbuild entered Day 4 on Tuesday with banks reportedly fielding more than $10 billion of indications of interest against $3.5 billion of paper available — roughly 2.5 times oversubscription. [1] [2] Pricing is on track for May 13, with shares trading May 14 under the Nasdaq ticker CBRS. The S-1/A that the company filed Monday locked in a $115-$125 price range across 28 million shares plus a 4.2-million-share underwriter overallotment, valuing the company at up to $26.6 billion fully diluted. [3] The paper's Tuesday major on the S-1/A and the OpenAI counterparty triangle framed the bookbuild as a referendum on customer concentration. Today's standard reads the order book as the buy-side's answer.

The arithmetic. Cerebras's 2025 booked revenue was $510 million, with $87.9 million in net income for the fourth quarter. [3] At the high end of the range, the IPO values the company at roughly 78 times trailing sales. [4] The OpenAI compute agreement signed in January — 750 megawatts of inference capacity through 2028, worth more than $20 billion — is the contract that closes the multiple. [5] Public filings indicate more than 60% of contracted forward Cerebras revenue is concentrated in that single customer. The $10 billion of IOIs are the public market saying it can live with that concentration at this price.

The roadshow's two-warrant week. Cerebras's S-1/A discloses the warrant OpenAI received in connection with the compute deal — a structurally similar instrument to the warrants AMD has issued to Meta and to OpenAI itself. [6] Three warrants for AI customers are now visible on the same May tape: AMD-Meta (160 million shares at a penny strike, vesting through 6 gigawatts), AMD-OpenAI (160 million shares, same structure, signed last year), and Cerebras-OpenAI (the disclosed warrant tied to the 750-megawatt deal). The cohort makes counterparty-concentration risk a single-document item rather than a story across separate filings.

What changes between today and pricing. Banks have until May 13 to either tighten the price band toward the $125 top end — the move oversubscribed bookbuilds typically produce — or hold at $115-$125 and let trading-day demand work the price up. CNBC reported Tiger Global is among the participants. [4] Sovereign-wealth participation is rumored at the $1.5-billion-plus level; the prospectus is silent on named anchors. Andrew Feldman, the CEO and co-founder, is not selling shares in the offering. [3] He will own 10.3 million Class B shares post-IPO, worth up to $1.28 billion at the high end of the range. The 99.2% Class B voting power keeps control with insiders regardless of the public valuation.

The disclosure cross with Greg Brockman's federal-court testimony in Oakland is the live legal question. Brockman confirmed under oath Monday that he holds a personal stake in Cerebras while serving as OpenAI's president. [7] OpenAI's $20-billion-plus contract with Cerebras is the largest single line in the chipmaker's revenue projection. Whether Cerebras's lawyers conclude Brockman's sworn testimony triggers an additional risk-factor disclosure before pricing is the procedural question with six business days to resolve. The S-1/A as currently drafted catalogs OpenAI as the anchor customer but does not name Brockman. [3]

What the IOI book is actually telling the desks. A $10 billion order against $3.5 billion of paper at 78 times sales is not a vote on Cerebras's profitability — Cerebras's quarterly profit is small, and consensus models do not assume the OpenAI revenue ratably hits the top line until 2027 at the earliest. The order book is a vote on whether OpenAI's compute strategy will continue to spend as scaled. CBRS will trade as the cleanest single-name proxy for that bet a public-market portfolio manager has had since the AI capex cycle began.

The roadshow runs through Thursday next week. Pricing is targeted May 13, after the close. Trading begins May 14. The S-1/A's anchor — a single $20 billion contract with a single counterparty whose president holds Cerebras stock — is what the buy-side is paying 78 times sales to own.

-- THEO KAPLAN, San Francisco