Cerebras Systems priced 30 million shares at $185 on Tuesday evening, raising $5.55 billion and marking the largest semiconductor IPO since Nvidia's $42 million offering twenty-seven years ago. The San Jose firm, which builds dinner-plate-sized wafer-scale processors for AI training workloads, settled 23% above its filed range of $150-$160 after institutional books closed oversubscribed by a factor the underwriters have not disclosed. Trading opens Thursday on Nasdaq under ticker CBRS.

The pricing gives Cerebras a fully diluted valuation of $18.5 billion, a multiple of 14.2x trailing twelve-month revenue of $1.3 billion and 68x adjusted EBITDA of $272 million. Lead underwriters Morgan Stanley and Goldman Sachs allocated roughly 60% of the base offering to long-only technology funds and 22% to sovereign wealth vehicles in the Middle East and Southeast Asia, according to two people briefed on the allocation. The remaining 18% went to hedge funds under lockup agreements that permit selling only after 120 days, twice the typical 90-day restriction and a structure Cerebras management insisted upon to dampen volatility in the opening weeks.

Cerebras competes directly with Nvidia in the market for large-scale AI training infrastructure, but its architecture inverts the conventional approach. Where Nvidia clusters thousands of discrete GPUs, Cerebras etches 850,000 cores onto a single 46,225 square millimeter silicon wafer, eliminating inter-chip communication latency and simplifying data center design. The company disclosed in its S-1 that 41% of 2025 revenue came from seven customers, four of which are national AI programs in countries that face U.S. export restrictions on Nvidia's H100 and H200 chips. That concentration presents both margin durability—Cerebras earns gross margins above 68%, compared to Nvidia's 75%—and regulatory risk that the Commerce Department could tighten wafer-scale export rules within the next eighteen months.

The IPO follows a pattern in which firms building alternatives to Nvidia's CUDA software moat have struggled to sustain valuations after debut. Graphcore, a UK rival, raised private capital at a $2.77 billion valuation in 2020 and is now valued near $400 million in secondary markets. SambaNova, another wafer-scale competitor, delayed its own IPO after Cerebras filed, waiting to see whether public investors would pay premiums for non-Nvidia exposure. The answer, for now, is yes: Cerebras' pricing implies the market will tolerate customer concentration and geopolitical exposure in exchange for access to the $87 billion AI accelerator market that IDC expects to grow at a 31% CAGR through 2029.

Allocators should monitor two events in the next ninety days. First, whether Cerebras wins a contract with one of the three hyperscale cloud providers—Microsoft, Google, or Amazon—currently testing wafer-scale architecture in private trials, which would reduce customer concentration below 40% and likely lift the stock 15-20% on announcement. Second, whether the Commerce Bureau of Industry and Security proposes new rules governing wafer-scale chip exports to non-allied nations, a rulemaking that Washington insiders expect by late July. If those rules carve out Cerebras by name, the revenue base contracts immediately.

Cerebras will report its first quarterly earnings as a public company on August 6, forty-two trading days after the IPO lockup expires for early investors holding 68 million shares, or 37% of the pre-IPO float. The timing is intentional: management wanted earnings visibility before the lockup ends, giving the market a profitability milestone to anchor against potential selling pressure. The IPO proceeds will fund a $1.2 billion buildout of in-house wafer fabrication capacity in Taiwan, reducing reliance on TSMC and shortening lead times from sixteen weeks to under ten by mid-2027.