In an glimpse at how megacap tails wag the dog, a near half-trillion dollar shakeout in AI-bellwether Nvidia's market cap in just a week continued to drag on the entire market even though most S&P500 stocks ended higher on Monday. Without any obvious trigger beyond a bout of nervy profit taking into Friday's half-year end, Nvidia has recoiled by almost 20% since last Thursday's record high - lopping more than $430 billion off its market value in the process. While the artificial intelligence champion chip behemoth remains up almost 140% for the year to date, the sheer scale of stock and the extent of the shakeout pack a punch for index investors.
