Source

Fabrinet (FN) reported fiscal Q4 FY26 on 2026-08-17 after the close: revenue $1.316B vs ~$1.27B consensus, non-GAAP EPS $4.10 vs $3.81; guided Q1 to $1.375–1.425B (a modest sequential step after a +45% y/y quarter), disclosed a $56.7M loss on non-marketable equity securities, and heavy capex pushed Q4 free cash flow to −$36.9M; management flagged Q1 gross-margin pressure and a component shortage. The stock fell ~20% on 2026-08-18 and dragged the optical group (AAOI −15%, COHR −13%, LITE −10%) plus MRVL −8% and APH −7%.

Sources: Seeking Alpha "Fabrinet falls despite Q4 beat; Q1 gross margin may see pressure; component shortage a headwind" (2026-08-18); 24/7 Wall St "Fabrinet Drops After Earnings Dragging Down Peers Like Marvell and Amphenol" (2026-08-18); Investing.com "Fabrinet Selloff Shows the Cost of Elevated AI Expectations" (2026-08-18). Captured as the receipt for the 2026-08-18 brief's cause claim.