Oracle shares reverse lower, fall 4% to session low

A single software name swinging the index this sharply shows how concentrated the market's recent gains have become, and the divergence is the real story: chips up 3% while Oracle drags the Nasdaq 100 down to a 1.2% advance and the Dow slips negative. The read-through is less about Oracle itself than about how fragile broad index performance looks when one large-cap reverses. Whether semiconductors can keep carrying the tape while software wobbles is the open question.