January pullback was orderly due to sector rotation into defensives and materials (inflation hedges). Rotation out of tech (software, semis like Nvidia/AMD) into utilities, materials, industrials. Today's rotation is good - broadening out. Watch industrials (benefit from higher energy prices & growth optimism), transports/rails, large machine builders (Deere, Caterpillar). Healthcare catching a bid, could be bottom-feeding sector (UnitedHealth).
Rotation out of defensives into higher beta doesn't take much to move markets; materials down 5% doesn't meaningfully impact S&P 500.