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Amazon jumps 15.3%, posts best day in 14 years

Amazon jumps 15.3%, posts best day in 14 years

The $AMZN rally added $390 billion in market capitalization in a single session, marking the stock’s strongest daily performance since 2011.

Fact Check
Yahoo Finance primary market data confirms AMZN closed +15.32% on July 31, 2026, matching the claim's 15.3% and the earnings-driven (AWS) catalyst. The $390 billion market-cap addition is internally consistent with a 15.3% gain on Amazon's ~$2.5T pre-rally valuation. The 'best day in 14 years' (i.e., since 2011) is plausible and consistent with Amazon's history of large post-earnings moves. The Kobeissi Letter X post is the originating source; its numeric claims are corroborated by authoritative market data, though the exact '14 years / 2011' superlative is not independently verified in fetched sources.
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Summary

Amazon shares surged 15.3% in the session, delivering the company’s best trading day in 14 years. The move added $390 billion to Amazon’s market capitalization, underscoring the scale of the rally in one of the market’s largest stocks. The source frames the advance as Amazon’s strongest one-day gain since 2011.

Terms & Concepts
  • market capitalization: Total value of a company’s shares.