Midterm Results Hit the Tape While Tech Selloff Leaves Nasdaq 1.1% Lower

Sector Rotation

Sector rotation is the movement of investor money from one part of the market to another, typically as expectations about growth, rates or valuations change. Instead of selling stocks outright, investors sell sectors they think are overextended or exposed to bad news and buy sectors they see as cheaper or more defensive. The result is that index performance diverges: a tech-heavy index can fall while a more diversified one rises. The mechanics come from index construction. The Nasdaq Composite is dominated by technology and communication companies, so it moves with them. The Dow is a price-weighted index of 30 large companies with a smaller tech share, so it can rise when money leaves tech for industrials, energy, financials or health care. Analysts track relative performance between sectors, such as tech against the equal-weighted market, to spot rotations. Rotation is not a signal that the market is healthy or unhealthy by itself. It can be a benign rebalancing after a big run, or an early sign of broader risk reduction if the buyers of the other sectors fade. The key tests are breadth and whether the rotating money stays in the market.