In a week when AI chipmaker Nvidia suffered the biggest one-day loss of value on record and the Federal Reserve said it was in no hurry to cut rates again, a few gauges underscore markets' vulnerability to big swings.

DeepSeek's rise could challenge the sustainability of Big Tech earnings growth, a key pillar of the bull market rally.

U.S. investors looking at global index funds might start singing the 1985 song referenced above. American stocks now account for three-quarters of the MSCI World index’s allocation. Topdown Charts’ Callum Thomas says the current weighting is now bigger than it was during the 1970s Nifty Fifty era.

In fact, this is a shortsighted view that misses the significant benefits that DeepSeek represents for the U.S. economy and for businesses worldwide. What’s exciting is that the

Technology stocks plunged Monday after China’s DeepSeek announced it had trained a sophisticated AI model at a fraction of the cost of Silicon Valley firms, sparking a sharp reversal in the AI rally.

Enter DeepSeek, a Chinese AI startup that has not only stunned global tech giants with its cutting-edge innovations but also weathered a significant cyberattack aimed at undermining its meteoric rise.