On May 29, Applied Optoelectronics fell 5.12% in regular trading, trading at $159.93/share, with trading volume of $371 million. The decline was driven by continued fallout from the company's Q1 earnings miss combined with persistent sector-wide selling pressure in optical communications.

The company previously reported a Q1 loss of $0.12 per share, falling short of market expectations, which has weighed on the stock since mid-May. Although the company's Xinbei factory received production approval from a hyperscale customer for 800G optical modules in late May — with projected monthly capacity exceeding 100,000 units by year-end — the positive catalyst failed to offset broader sector headwinds.

Within the Communication Equipment sector, the overall tone remained bearish. Among sector peers, Lumentum fell 2.92%, Ondas Holdings fell 8.3%, Nokia fell 1.33%, and Cisco fell 0.42%, while Arista Networks rose 2.49%. The widespread weakness across optical communications names intensified downward pressure on the stock.

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