This Car Stock Is One of the S&P 500’s Worst Performers Today. Here’s Why.

Shares of AutoZone dropped Tuesday after the automotive parts retailer reported weaker-than-expected quarterly results. Same-store sales rose 5.5% from the prior year on a constant currency basis, just below Wall Street’s estimate of 5.6%. AutoZone stock was down 4.2% to $3,607.47 on Tuesday, putting it on pace for its largest single-day decline since April, according to Dow Jones Market Data.