NEW YORK -- Stocks that moved substantially or traded heavily on Monday:
Children's Place Inc., down $9.78 to $84.82
The children's clothing retailer reported weak fourth-quarter results and issued a weak forecast.
Vale SA, up 3 cents to $12.42
The mining company's CEO and other executives resigned as it faces increased legal pressure following a deadly dam collapse.
Nightstar Therapeutics PLC, up $10.02 to $25.18
Biotechnology company Biogen is buying the gene therapy developer for about $877 million in an all-cash deal.
Enbridge Inc., down $2.19 to $35.06
The energy company is delaying the startup of its planned Line 3 replacement crude oil pipeline through northern Minnesota.
PulteGroup Inc., up 94 cents to $27.68
The Commerce Department said construction spending, which benefits the homebuilder and its peers, reached record levels in 2018.
Gap Inc., down $1.77 to $27.74
The clothing retailer is buying the assets of bankrupt children's fashion retailer Janie and Jack for $35 million.
AT&T Inc., down 84 cents to $29.98
The telecom company is reorganizing its WarnerMedia unit, which includes HBO and Warner Bros.
Tesla Inc., down $9.43 to $285.36
The electric car maker plans to unveil next week its Model Y SUV, which will cost about 10 percent more than its Model 3, which starts around $35,000.