Stocks that moved substantially or traded heavily Friday on the New York Stock Exchange and Nasdaq Stock Market:
WellCare Health Plans Inc., up $ 4.89 at $47.33
The government health insurance provider's first quarter earnings more than tripled, and it lifted its forecast for the year.
Warner Music Group Corp., up 28 cents at $8.18
Len Blavatnik's Access Industries is buying the music recording company for $8.25 per share, or $1.3 billion.
Washington Post Co., down $ 20.31 at 412.25
The newspaper company's Kaplan education chain posted a drop in student enrollments, driving first-quarter profit down 67 percent.
Barnes & Noble Inc., up $1.66 at $14.37
Janney analysts started the bookstore chain at "Buy," saying its No. 2 market position in digital book sales will boost earnings.
CF Industries Holdings Inc., up $8.57 at $137.82
The fertilizer maker posted a first-quarter profit that topped analyst expectations after an acquisition helped boost revenue.
Warnaco Group Inc., down $5.37 at $56.51
The clothing maker's first-quarter earnings fell slightly and missed analysts' expectations despite a 13 percent increase in revenue.
Blue Nile Inc., down $4.08 at $51.71
The online diamond and jewelry retailer gave a second-quarter earnings guidance below Wall Street's expectations.
K-Swiss Inc., down 72 cents at $11
The sneaker seller's first-quarter revenue grew as U.S. orders jumped, but it posted a deeper loss because expenses increased.