US technology shares extend a four-day sell-off, with major companies declining across the sector. According to the reports, Tesla leads the losses, while other large-cap technology firms—including Nvidia, Alphabet, Meta and Amazon—also fall. The move reflects investor concerns about company spending levels related to artificial intelligence and broader capital expenditure plans. Market participants appear to be weighing whether the scale and timing of AI-related investments will translate into near-term financial returns, and whether rising capex commitments raise costs or pressure margins. The combined effect is described as a continued sharp decline in US tech equities over the week, following the earlier phase of the sell-off. Both reports focus on the same set of stocks and the same underlying driver—growing scrutiny of AI spending and capital expenditure trajectories—though neither provides additional detail on specific earnings announcements or changes in guidance in these accounts.