Astera Labs designs connectivity semiconductors that move data between the processors, memory and accelerators inside AI and cloud servers. Its products address the points where a rack scale system tends to bottleneck: signal integrity over longer copper runs, memory pooling across devices, and switching between accelerators. The portfolio spans PCIe and CXL retimers, Ethernet cable modules, memory controllers and fabric switches, tied together by diagnostic software that customers use to tune and monitor a deployment. Demand tracks data centre buildouts fairly directly, which makes results sensitive to the capital spending plans of a small group of very large buyers.