Nvidia Corp. disclosed in a regulatory filing that revenue from a single unnamed customer represented 23% of its $46.7 billion fiscal second-quarter sales, or roughly $10.8 billion. A second customer accounted for an additional 16%, about $7.5 billion. Both relationships are tied to the company’s Compute & Networking unit, which houses its data-center business. The figures show that nearly 39% of Nvidia’s quarterly revenue—about $18.3 billion—came from just two buyers, underscoring the chipmaker’s dependence on a handful of large purchasers for its accelerated-computing products. Nvidia also said cloud service providers generated about half of its data-center revenue in the period, highlighting the continued surge in demand for hardware that supports artificial-intelligence workloads.