Retreating crude oil prices sent the markets down to a lower close with the Dow falling 61 points to 21,467. Nasdaq dropped 50 points to 6,188.

On the upside

Goldman Sachs upgraded Vivint Solar (NYSE: VSLR) from a Neutral rating to a Buy rating and lifted its price target from $3.50 to $6.00.

Armistice Capital acquired a 5.1% stake in Vanda Pharmaceuticals (Nasdaq: VNDA).

A German newspaper reported that T-Mobile parent Deutsche Telekom liked the idea of merging T-Mobile with Sprint (NYSE: S).

On the downside

Profit taking weighed down shares of Zion Oil & Gas (Nasdaq: ZN).

Teledoc (NYSE: TDOC) will offer $200 million in convertible senior notes.

Chipotle Mexican Grill (NYSE: CMG) warned of lower margins due to increased advertising and cybersecurity expenses.

In the broad market, declining issues outpaced advancers by a margin of more than 7 to 3 on both the NYSE and on Nasdaq. The broader S&P 500 tumbled 16 points to 2,437. Bitcoin jumped $185 to $2724.