Lumentum Holdings shares plummeted 8.77% during intraday trading on Friday, reflecting a sharp downturn across the semiconductor and optical networking sectors.

The decline occurred amid a broader sell-off in chip and optical stocks. Analysts pointed to a "handful of narratives" driving the weakness, rather than a single catalyst. Key factors included Intel's inability to sustain gains following a strong earnings report, which may have dampened sentiment across the sector. Additionally, the upcoming IPO of Chinese memory-chip maker ChangXin Memory Technologies (CXMT) and reports of its engagement with Apple raised concerns about competitive pressures. Weakness in the Korean stock market also spilled over into U.S. chip trading.

Optical peers were similarly hit, with Coherent and Applied Optoelectronics falling sharply, indicating a sector-wide retreat. Broader anxieties over hyperscaler spending and financing risks for AI infrastructure buildouts also contributed to the negative tone, according to market commentary.