Stocks that moved substantially or traded heavily Thursday:
Walgreens Boots Alliance Inc., down $3.68 to $69.61
The drugstore chain reported lower sales than analysts expected.
Tilray Inc., up $7.30 to $78.30
The Canadian marijuana grower said it will develop marijuana-infused drinks in a partnership with Labatt Breweries.
Conagra Brands Inc., down $4.81 to $24.28
The maker of Chef Boyardee and other food brands reported disappointing sales in its latest quarter.
Chevron Corp., down $2.85 to $104.98
Oil prices continued to retreat, with benchmark U.S. crude falling 4.8 percent.
Newell Brands Inc., down 37 cents to $20.03
Activist investor Carl Icahn bought more stock in the consumer products company.
Newmont Mining Corp., up $2 to $34.09
The price of gold rose Thursday as the dollar weakened and investors worried about economic growth.
Spectrum Pharmaceuticals Inc., down $4.05 to $6.39
The drugmaker said regulators won't grant a faster review of an experimental lung cancer drug.
Twitter Inc., down $3.64 to $29.29
Short-selling firm Citron Research slashed its price target and said Twitter will have to make big changes to curb abusive behavior.