Xin Lang Cai Jing·2025-10-21 02:21Group 1 - Barclays has downgraded the ratings of Lumentum (LITE.US), Astera Labs (ALAB.US), and Marvell Technology (MRVL.US) from "Overweight" to "Hold" due to decreased attractiveness compared to other AI-focused companies [1] - Lumentum's stock price has increased by 60% over the past three months, significantly outperforming the S&P 500's 5% increase, but its risk-reward profile is no longer favorable compared to peers [1] - Astera Labs faces market penetration issues with its UALink product, lacking significant advantages outside of the Amazon Trainium 3 project, and risks being marginalized as the industry shifts towards Ethernet, ESUN, and SUE-T solutions [1] Group 2 - Marvell Technology's rating was lowered due to its specialized integrated circuit business underperforming initial expectations and additional market risks facing its data center business [1] - Barclays is not bearish on the semiconductor sector overall, having upgraded the rating of KLA Corporation (KLAC.US) to "Overweight," citing optimism about long-term growth prospects and KLA's leading position in process control [2] - KLA is expected to experience strong growth as revenue from markets outside of China is anticipated to increase with relatively low entry barriers [2]