Stocks that moved substantially or traded heavily on Wednesday:
Centene Corp., down $2.73 to $52.12.
The health insurer is paying more than $15 billion in cash and stock for rival WellCare.
Shoe Carnival Inc., up $6.82 to $37.30.
The footwear retailer swung to a fourth-quarter profit that beat Wall Street forecasts.
Fiat Chrysler Automobiles N.V., up 27 cents to $15.11.
The automaker wants to restart merger talks with Nissan, according to media reports.
At Home Group Inc., down $4.65 to $18.20.
The home decor retailer's fourth-quarter profit fell short of Wall Street expectations.
SecureWorks Corp., down $1.62 to $18.21.
The information security services provider reported weaker-than-expected fourth-quarter revenue and gave investors a weak profit forecast.
Unifirst Corp., up $11.68 to $150.92.
The uniform provider's full-year profit and revenue forecasts were well above investor expectations.
Lennar Corp., up $1.96 to $51.67.
The homebuilder reported growth in new home orders and said it sees increased interest in new home purchases.
Ollies Bargain Outlet Holdings Inc., up $1.86 to $83.42.
The retailer's fiscal fourth revenue fell short of Wall Street expectations and it gave investors a weak profit forecast.