Astera Labs is trading 5.47% lower at $336.93 after-hours, with no clear company-specific catalyst identified. - It closed the regular session at $356.42; searches found no clear company-specific announcement on October 1, and the latest company coverage surfaced was older rather than a new catalyst. - Major indices were little changed, while Treasury-yield concerns and AI-sector strength pulled in opposite directions. - Available evidence does not establish a specific cause for the after-hours decline.