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  来源:Wind万得

  周三,美股市场遭遇重挫,三大指数全线收跌,科技板块成为下行主力。投资者对全球科技巨头的前景产生担忧,同时美联储主席鲍威尔关于关税影响的发言加剧了市场的紧张情绪。

  截至收盘,道琼斯工业平均指数下跌699.57点,跌幅1.73%,报39,669.39点;标准普尔500指数下跌2.24%,报5,275.70点;以科技股为主的纳斯达克综合指数下跌3.07%,报16,307.16点,已较此前高点下跌约19%,逼近技术性熊市门槛。

  此外,黄金则大涨3.5%至3342.48美元/盎司。

  科技板块的下跌由一则突如其来的公告引爆。英伟达周三披露,公司将在本季度计提高达55亿美元的费用,原因是出口限制导致相关芯片产品销售受阻。这一消息在盘中迅速发酵,该公司股价单日大跌6.9%,带动整个半导体板块集体回调。

  该公司在提交给监管机构的文件中指出,由于部分关键产品需要获取特定出口许可,公司被迫中断部分海外出货安排。尽管企业未明确说明影响将持续多长时间,但市场普遍担心,这种限制可能对未来多个季度的营收和利润构成压力。

  与此同时,其他芯片股亦无一幸免,其中,AMD跌幅达7.4%,美光科技下跌2.4%。追踪整个半导体行业表现的VanEck半导体ETF(SMH)下跌超过4%。

  “当前标准普尔500指数的结构相比以往更加偏向科技板块,这使得科技股的波动对整体市场影响更为显著。”HorizonInvestments投资组合管理主管ZacharyHill指出,“上周我们看到科技板块拉动指数上涨,本周则是反向演绎,跌势同样迅猛。”

  尽管部分贸易限制措施近日获得暂缓执行,但投资者普遍担心相关豁免可能只是临时性安排。特别是在智能手机、电脑等关键电子产品方面,虽然目前得以避免额外征税,但政策走向仍存诸多不确定性。

  过去数年间,科技公司在指数中的权重不断提升,尤其是在人工智能、数据中心和半导体等热门领域获得资本追捧。这种结构性偏重在牛市中放大了收益,但在面临行业性风险时也导致整体市场承压。

  除企业消息外,宏观层面的不确定性亦令投资者情绪紧张。美联储主席鲍威尔在当天的一场公开问答中提到,关税措施短期内可能推升通胀,对央行实现物价稳定与充分就业这两大政策目标带来挑战。

  “在某些情况下,我们可能会处于一个目标之间出现张力的局面,”他表示,“届时我们需要评估经济偏离各项目标的程度,以及不同目标达成所需的时间差异。”

  这番表态被市场解读为货币政策路径的不确定性上升,尤其是在当前经济尚处于复苏阶段、核心通胀尚未完全受控的背景下,加剧了市场对未来政策方向的猜测。

  鲍威尔并未明确表态他对利率走势的看法,但指出:“目前来看,我们有充足的空间在政策上按兵不动,等待更清晰的经济信号后再考虑是否调整政策立场。”

  随着鲍威尔讲话,美股跌至盘中低点,国债收益率亦同步回落。

  鲍威尔指出,无论是基于调查还是市场的短期通胀预期均有所上升,尽管长期通胀前景仍大致接近美联储2%的目标。他表示,联储关注的核心通胀指标预计在3月将达到2.6%。

  “关税极有可能导致通胀在短期内上升,”鲍威尔表示,“这种通胀影响也可能更为持久。能否避免这种情况,将取决于关税影响的规模、其完全传导至价格所需的时间,以及我们是否能保持长期通胀预期的稳定锚定。”

  这场演讲与他本月早些时候在弗吉尼亚州的讲话大致相同,其中一些段落几乎原封不动。鲍威尔同时提到了增长与通胀面临的双重风险。

  他指出,美国一季度国内生产总值(GDP)将在本月稍晚公布,初步数据显示,今年一季度的经济增长较去年强劲水平明显放缓。尽管汽车销售依然强劲,但整体消费支出增幅较为温和。此外,一季度强劲的进口数据(反映出企业试图在关税生效前提前备货)预计也将拖累GDP增长。

  当天早些时候,美国商务部公布,3月零售销售环比增长1.4%,高于市场预期。报告指出,这一增长中相当一部分来自消费者为规避关税而提前购车,但多个其他行业也录得可观增长。

  在这份数据发布后,亚特兰大联储将其对美国一季度GDP的增长预期下调至-0.1%,并指出这是在剔除黄金进出口异常上涨后的估算。尽管增速放缓,鲍威尔仍表示,美国经济“整体处于稳健状态”。

  如果通胀上升,美联储将维持利率不变,甚至可能加息以抑制需求;而如果经济增长放缓,则可能促使美联储考虑降息。鲍威尔强调,控制通胀预期仍是重中之重。

  根据芝商所(CMEGroup)的FedWatch工具,市场预计美联储将在6月开始降息,并在2025年底前累计降息三到四次,每次幅度为25个基点。

  数据显示,自4月初相关政策首次公布以来,标准普尔500指数已累计下跌约7%,纳斯达克下跌7.4%,道指则下跌6%。市场的高度敏感性表明,科技股的利空消息叠加政策扰动,将持续成为决定短期走势的关键变量。

  //  美联储左右为难 //

  近期美债价格的剧烈波动迫使美国总统关税休战,即使在他改变主意之后,投资者仍然感到不安,美债收益率上升表明美国政府面临压力,并且对政府偿还债务的信心正在减弱,市场将目光放在美联储身上。

  根据Semafor报道,知情人士表示,美联储并未加速推动鼓励银行增持政府债券的监管改革。这一立场与华尔街和白宫的期望形成鲜明对比,后者一直游说监管机构迅速修改资本金要求,以增加银行购买美债的意愿。

  知情人士表示,目前对持有大量美债的银行进行惩罚性调整的规则,正在经历一个可能耗时数月的艰苦内部程序。但调整这些政策可能会为充满市场带来数十亿美元的购买力。波士顿联储主席柯林斯上周表示,美联储“绝对”准备在必要时进行干预。一些投资者认为,这番言论表明美联储已准备好介入。

  //  鲍威尔面临更多不确定性 //

  随着2025年美国政治格局变化,鲍威尔的未来正面临越来越多的不确定性。当地时间周一,美国财政部长贝森特在接受采访时表示,他与总统“一直在考虑”下一任美联储主席的人选,并计划在秋季开始面试潜在候选人。

  现任美联储主席鲍威尔的任期将于2026年5月结束,而贝森特的此番发言提前点燃了市场对美联储领导层变动的猜测火焰。

  知名金融分析师JimBianco在社交媒体上发文指出,鲍威尔可能面临两种命运——要么被总统直接解职,要么被实质性架空:

  贝森特去年提出的替代方案是设立一位“影子美联储主席”,也就是说提前几个月任命鲍威尔的继任者。

  接着,这位被提名人可能会定期出现在财经电视节目上,像个“纸上谈兵的四分卫”(armchairQB),批评鲍威尔的每一次讲话和决定,从而削弱他的权威。

  我们应该听明年5月离任的鲍威尔的意见,还是听明年5月即将上任的美联储主席的意见?听起来影子美联储主席将于今年秋季上任。

  //  AI芯片禁售升级 //

  美东时间4月15日,英伟达宣布由于美国政府限制其H20人工智能芯片向部分国家出口,公司将计提55亿美元的相关费用。

  受此消息影响,4月16日,公司股股价跌6.9%。

  公司在一份文件中称,4月9日,美国政府通知英伟达,出口这些芯片到部分国家需要获得出口许可证。美国当局正强化对AI芯片的出口管制,英伟达在管制生效后加快研发步伐,设计出尽可能符合美国政策要求的新型芯片。

  这一披露标志着迄今为止最明显的信号,显示美国加强对其芯片出口限制可能会减缓英伟达历史性的高速增长。

  在拜登政府执政期间,美国在2022年就对AI芯片出口进行了限制,并在次年更新了相关规则,以防止更先进的AI处理器的销售。针对部分市场推出的H20芯片正是为符合美国出口管制而特别设计的,该芯片在2024年为公司带来了约120亿至150亿美元的收入。

  英伟达首席执行官黄仁勋在公司今年2月的季度财报电话会议中透露,部分市场收入已降至出口管制前水平的一半。在截至1月结束的财年中,公司超过一半的销售收入来自美国企业。

  从技术规格看,英伟达的H20芯片与在美国及其他国家使用的H100和H200AI芯片在架构上具有可比性,但H20芯片在互连速度和带宽方面较慢。该芯片基于2022年推出的Hopper一代AI架构,而英伟达当前正重点推广其新一代AI芯片——Blackwell系列。

  除了现有的出口管制外,英伟达还将面临从下月开始实施的“AI扩散规则”带来的新限制,该规则最初由拜登政府提出,用以规范公司的芯片出口范围。

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