** Shares of Amazon AMZN.O rise ~3% to $255.09 in premarket trading
** Company said on Monday it plans to invest up to $25 billion in AI startup Anthropic, while Anthropic has agreed to spend more than $100 billion over the next decade on company's cloud services
** J.P. Morgan says the expanded Amazon-Anthropic commitments improve near- and medium-term visibility for the Trainium ecosystem and related cluster infrastructure, which is a positive read-through for company's semiconductor suppliers Marvell Technology MRVL.O and Astera Labs ALAB.O
** Amazon CEO Andy Jassy said in a statement that Anthropic's use of Trainium chips "reflects the progress we've made together on custom silicon"
** Anthropic wants to gain an edge in AI, with models focused on coding and design, while Amazon looks to attract users to its custom AI chips
** Seventy-one analysts rate the stock "buy" on average; median PT is $285 - data compiled by LSEG
** As of last day's close, stock up 7.5% YTD
(Reporting by Kanishka Ajmera in Bengaluru)
((mail to: Kanishka.Ajmera@thomsonreuters.com))