Cerebras Systems closed Friday at $6.12 per share, down 20% for the week and 42% below its October IPO price of $10.50. The AI chip maker's market capitalization fell below $1.4B, erasing roughly $800M in enterprise value since its public debut five months ago.
The decline accelerates as the standard 180-day lockup period expired this week, freeing insiders and early backers—including Benchmark, Eclipse Ventures, and Foundation Capital—to liquidate positions. Volume spiked 340% above the 30-day average on Wednesday alone. Meanwhile, Nvidia's latest earnings call included pointed remarks on wafer-scale architecture limitations, language Cerebras management had not publicly addressed as of Friday's close. The company's flagship CS-3 chip, a 46,225 mm² monolithic design, commands premium pricing but lacks the modular deployment flexibility institutional buyers increasingly demand for inference workloads.
The timing matters because Cerebras depends on a narrow customer base. Its Q3 2024 filing disclosed that 87% of revenue derived from just four unnamed customers, with one accounting for 64% of total sales. That concentration, paired with a $130M net loss on $136M in trailing revenue, leaves little margin for churn. Nvidia's B200 series, shipping in volume this quarter, offers comparable training performance at roughly 60% of Cerebras' per-FLOP cost when amortized across a three-year refresh cycle. Allocators modeling competitive displacement scenarios are marking Cerebras cash reserves—$228M as of September 30—against a quarterly burn rate approaching $40M.
The lockup expiration also exposes governance risk. CEO Andrew Feldman and CTO Sean Lie collectively hold 18.3M shares under vesting schedules that now permit partial sales. No insider transaction disclosures have appeared in SEC filings since the lockup lifted, but the absence of affirmative buying signals indifference at best. Worth noting: Cerebras postponed its December analyst day without rescheduling, a move that coincided with two sell-side downgrades citing order-visibility concerns.
Operators should track Q1 2025 revenue guidance, expected in early March, for signs of customer concentration easing or deepening. Watch for amendments to credit facilities or equity raises before June, when another $38M in convertible notes mature. Nvidia's GTC conference in late March will clarify whether wafer-scale skepticism is marketing or roadmap doctrine. Any Cerebras customer wins in the $50M+ range would surface in 10-Q risk-factor updates by mid-May.
The stock now trades at 10.3x forward revenue, half the 21x multiple it commanded at IPO, and still above breakeven is 24 months out under the most optimistic Street model.
The takeaway
Cerebras lockup expiration coincides with Nvidia competitive pressure and 87% customer concentration, erasing $800M in market cap.
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