Fundamentally, the filings disclose that one customer accounted for 11.1% of last year's revenue (12.1% and 10.7% in the two prior years) without naming it. To be clear, on the call sales leadership described a “lead computing customer” ramping a wafer‑scale engine and referenced Cerebras and other wafer‑scale firms, leading analysts to infer the lead customer is Cerebras—but that inference is not disclosed. Management declined to break out the backlog share, noting the customer is important but not the only major one.