US Stock Market Key News Summary August 19, 2026

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Global Bond Markets Face Fierce Sell-Off! U.S., Japanese, and European Yields Soar—AI Boom Emerges as Hidden Catalyst

Global bond markets extended their sell-off on Tuesday (18th), with government bond yields in major economies including the U.S., Japan, Germany, and France climbing to multi-year or even decades-long highs. Rising oil prices—surpassing $90 per barrel—have reignited inflation concerns, while high government debt and fiscal deficits continue to weigh on investor sentiment. Notably, a new and previously uncommon force is amplifying this bond market turmoil: the AI boom is intensifying capital competition between tech giants and national governments in the bond market.

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Micron Plunges 7%, Ending Rally—Why Are Memory Stocks Falling?

Micron Technology (MU-US) shares dropped sharply on Tuesday (18th), following a broad downturn in the semiconductor sector, driven by rising bond yields. The memory chipmaker closed down 7% at $941.10, abruptly ending a five-day winning streak. Just the previous Monday, Micron’s stock had crossed the $1,000 threshold.

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U.S. Treasury Yields Break 4.7%—Fed Seems Unhurried as Mortgage Borrowers Struggle

Long-term U.S. Treasuries have been heavily sold off recently, pushing the 10-year yield above 4.7%. This has not only raised Wall Street’s concerns about repricing of overvalued equities but also transmitted financial pressure directly to American households through mortgages and consumer credit. While stock market gains are largely enjoyed by the wealthy, the pain of high interest rates may be more persistent for the general public.

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AI Chip Stocks Were Unstoppable—Why Are Micron, SanDisk, and Other Stars Now Retreating?

Chip stocks had just begun to rebound, but their rally paused on Tuesday (18th) as investors reassessed shifting economic conditions and the latest financial data from a major AI company. Among the worst performers in the S&P 500 on Tuesday were numerous semiconductor and optical components firms. Coherent, Ciena, and Lumentum Holdings led the declines, each falling by at least 9%. On the memory front, SanDisk (SNDK-US) dropped 9%, while Micron Technology (MU-US) fell 7%.

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Thought Bonds Could Diversify AI Risk? JPMorgan Warns Stocks and Bonds Are Both at Risk

JPMorgan Asset Management warns that concentration risks from AI investments have spread from equities to bond markets. Even if the AI supercycle isn’t over, investors must be more cautious in asset allocation. Gabriela Santos, Chief Market Strategist for the Americas at JPMorgan Asset Management, said in a Bloomberg TV interview on Tuesday (18th) that while investors can remain optimistic about AI’s long-term prospects, they must carefully consider portfolio construction.