Anthropic's narrower sequential Q3 loss lifts tech backers and chips
** Anthropic's slimmer loss and higher revenue in Q3 boosts key tech backers and chip stocks
** In its amended IPO prospectus with SEC, Anthropic's net loss narrows sharply to $23.29 bln in Q3, from $66.3 bln in Q2
** Revenue rises to $16.96 bln from $11.56 bln
** Company records $895.4 bln in computing spending commitments with partners including Amazon AMZN.O and Alphabet's GOOGL.O Google, ranking among the largest AI infrastructure commitments on record
** Amazon tops Magnificent Seven group with a 5.28% gain, and Alphabet adds 1.44%
** Both are among Anthropic's investors
** Semiconductor stocks such as Broadcom AVGO.O and Nvidia NVDA.O up 1.65% and 1.29% respectively
** The listing plans test investor appetite for AI amid a sluggish IPO market
** Microsoft MSFT.O, an Anthropic investor and an early backer of rival OpenAI, rose 0.5%