The headline numbers make it look like stocks are struggling: Dow: -0.09% $S&P 500(.SPX)$ : -0.05% Nasdaq: -0.24% But beneath the surface, that's misleading. Most stocks actually rose. Healthcare gained 3.2%. Consumer discretionary gained 1.6%. The reason the indexes still fell is simple: The largest technology companies have become so dominant that they can overwhelm hundreds of advancing stocks. That's concentration risk in action. The AI trade has entered a new phase Earlier in the year investors only cared about one question: Who benefits from AI spending? Now they're asking a harder question: Who ultimately pays for AI spending? That's a significant shift. The concern is that companies like $Apple(AA