** Shares of chipmakers Marvell MRVL.O and Astera Labs ALAB.O rise premarket after J.P. Morgan sees upside from Amazon-Anthropic's expanded $100 billion deal
** MRVL rises 2.8% to $151.84, ALAB jumps 9.3% to $192.21
** Expanded Amazon-Anthropic commitments improve near- and medium-term visibility for the Trainium ecosystem and related cloud infrastructure - J.P. Morgan
** Amazon AMZN.O said on Monday it would invest up to $25 billion in Anthropic, as the AI startup commits to spend more than $100 billion over next 10 years on AMZN cloud technologies
** Brokerage says deal supports multi-year demand for Trainium, improves revenue visibility for MRVL, ALAB
** Both firms supply components to AMZN, Trainium is AMZN's custom AI accelerator chip
** RBC raises MRVL price target to $170 from $115, upside of 15% to its last close
** Also raises ALAB PT to $250 from $225, upside of 42% to its last close
** YTD, MRVL up 74%, ALAB up 5.7%, as of last close
(Reporting by Utkarsh Tushar Hathi)
((utkarshtushar.hathi@thomsonreuters.com))