The assessment is "likely_true" because high-authority primary sources confirm the central tenet of the statement: that Nvidia experienced a significant, multi-day decline in stock value. One highly authoritative source directly states Nvidia's stock dropped "nearly 4%" on a single day amid a broader tech sell-off. Another high-authority source corroborates this, referring to a "steep sell-off" in the tech sector from which stocks later rebounded.While no source explicitly confirms the precise figure of a "$450 billion" loss, this number is plausible. A nearly 4% drop on a company with a market capitalization of over $3 trillion would represent a single-day loss of over $120 billion. A sustained sell-off over three days could realistically accumulate to a loss in the range of $450 billion. Several sources mention the figure "$450 billion", but they do so in unrelated contexts, such as Palantir's total market capitalization or projected industry spending. This suggests the specific number in the claim might be a conflation of different data points. However, this potential numerical inaccuracy does not invalidate the core, verified fact of a massive multi-day market value loss for Nvidia. The weight of the evidence strongly supports that an event of this magnitude occurred, making the statement substantially true.