4月21日，美股三大股指期货上涨，截止发稿，道指期货涨0.13%，纳指期货涨0.24%，标普500指数期货涨0.14%。
亚马逊涨近3%， 宣布与人工智能公司Anthropic达成一项里程碑式协议，立即追加投资50亿美元，并计划在商业里程碑达成后最高再追加200亿美元，亚马逊此此前已对这家Claude大模型缔造者投资80亿美元。作为交换，Anthropic承诺在未来十年内向AWS采购超过1000亿美元的计算资源，并大规模部署亚马逊自研Trainium AI芯片。
迈威尔科技续涨近3%，该股月内以来累涨近50%。谷歌正与其洽谈合作，共同开发两款新型芯片，旨在提升人工智能模型运行效率。
无人机概念次新股Aevex涨近9%，上市两日已累涨67%。
光通信概念股上涨，Astera Labs涨超5%，Credo Technology涨近5%；Applied Optoelectronics涨超2%，Lumentum、Coherent涨超1%。
黑莓续涨超4%，子公司QNX与英伟达合作开发AI系统。
阿拉斯加航空集团有限公司跌超4%。公司撤回了其全年盈利预测。
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