The Dow, S&P 500, and Nasdaq were little changed at midday ahead of Federal Reserve comments on interest rates coming later in the afternoon.

Chipotle Mexican Grill (CMG) shares climbed after the restaurant chain announced a 50-to-1 stock split.

Shares of FMC (FMC) advanced as the agricultural chemical maker shook up its leadership in North America and Latin America.

Carmax (KMX) shares also gained following an upgrade from Needham, which pointed to optimism about a recovery in demand for used cars.

Equinix (EQIX) shares slumped after short seller Hindenburg revealed a short position, accusing the data center owner of manipulating its accounting and selling an artificial intelligence (AI) “pipe dream.”

Shares of Signet Jewelers (SIG) sank as the operator of Kay Jewelers, Zales, and Jared stores missed quarterly sales estimates and posted weak guidance as fewer couples got engaged.

Shares of several COVID-19 vaccine makers declined after BioNTech (BNTX) reported lower-than-expected results and guidance on writedowns of inventory from its partner, Pfizer (PFE). 

Oil futures fell. Gold prices gained. The yield on the 10-year Treasury note was little changed. The U.S. dollar was up on the euro, pound, and yen. Most major cryptocurrencies traded lower.