Stocks that moved substantially or traded heavily on Wednesday:
Dave & Buster's Entertainment Inc., down $11.53 to $40
The chain restaurant and arcade operator reported disappointing first quarter results and cut its revenue forecast for the year.
PBF Energy Inc., down $1.80 to $24.40
The oil refiner is spending $1 billion for Shell's Martinez refinery in a move that expands its operations on the West Coast.
Mattel Inc., up 57 cents to $11.38
The toy maker rejected another buyout offer from Bratz doll maker MGE Entertainment, according to media reports.
Medidata Solutions Inc., down $3.38 to $91.37
The health care software maker is being bought by Dassault Systemes at a discount for $5.8 billion in cash.
Micron Technology Inc., down $1.88 to $32.96
The chipmaker and its peers are suffering the most from lingering concerns over the trade war between the U.S. and China.
Concho Resources Inc., down $2.68 to $98.16
The oil and gas company and its peers in the energy industry veered lower as the price of crude oil fell again.
Boeing Co., down $2.30 to $347.03
The airplane maker reported a steep drop in deliveries of commercial airliners in May.
Exelon Corp., up $1.24 to $50.45
The utility company and its peers gained ground as investors shifted funds into safe-play sectors, including utilities.