Which companies reduced their holdings in optical module manufacturing

Investors are reducing holdings in several optical module companies, including Applied Optoelectronics (AAOI), Lumentum (LITE), Coherent (COHR), Marvell (MRVL), and Fabrinet (FN), amid valuation concerns and sector-wide repricing.

Key Companies Experiencing Pullbacks

• Applied Optoelectronics (AAOI) saw a sharp stock decline of over 17% in a single day in June 2026, following earnings guidance that fell short of market expectations, despite strong year-to-date gains .
• Lumentum (LITE) and Coherent (COHR) both reported record revenues and earnings, yet shares dropped 5–7% after hours, reflecting investors taking profits and reassessing valuations .
• Marvell (MRVL) experienced a 13.3% decline, signaling a broader sector pullback .
• Fabrinet (FN), a contract manufacturer for multiple optical module vendors, also declined after reporting record revenue and EPS, indicating investor caution across the supply chain .

Reasons Behind the Reductions

1. Valuation Reassessment: Analysts and investors are recalibrating expectations for AI-driven optical module demand, particularly in high-speed data centers, leading to sector-wide repricing .
2. Earnings Guidance Gaps: Companies like AAOI provided forward guidance below analyst consensus, prompting investors to reduce exposure despite strong historical growth .
3. Market Sentiment Shifts: Reports from research firms such as SemiAnalysis challenged assumptions about costs and growth in AI data centers, triggering rapid selloffs across multiple optical module stocks .
4. Profit-Taking: After significant rallies earlier in the year, investors are realizing gains, contributing to declines even when fundamentals remain strong .

Broader Market Context

The optical module sector remains robust, with global market growth driven by AI workloads, data center expansion, and high-speed connectivity demand. However, supply chain constraints, component bottlenecks (e.g., lasers and modulators), and intense competition in the 400G+ segment are creating volatility in stock performance . This combination of strong fundamentals and market caution explains why investors are selectively reducing holdings rather than exiting the sector entirely. In summary, AAOI, LITE, COHR, MRVL, and FN are the primary companies where investors are trimming positions, largely due to valuation resets, earnings guidance, and sector-wide sentiment shifts, even as the optical module market continues to grow.