Good review: Yelp shares jumped 24 percent to $26.50 Friday after the Internet company's earnings beat expectations and the firm raised revenue guidance for the current quarter and full year.

Circle takes the square: Payment processing company Square, which is run by Twitter founder Jack Forsey, dropped 22 percent, to $10.22 Friday after it reported a larger-than-expected quarterly loss and sharply higher expenses.

Name your price: Travel company Priceline sank 10 percent, to $1,215 Wednesday despite posting stronger-than-expected earnings. The company warned that profits would slow in the second quarter as it spends more on marketing and as the timing of holidays shifts traveler bookings. Its shares closed the week at $1,250.10.

Blue pill: Pfizer jumped 2.8 percent, to $33.73 Tuesday after the company reported solid first-quarter earnings that beat analysts' estimates. Pfizer saw big sales gains in some of its newest drugs, including Lyrica and the vaccine Prevnar 13. Pfizer shares closed Friday at $33.58.

Get an education: Apollo Education Group, which runs the University of Phoenix, rose 8 percent to $8.46 Monday after a group of investors raised their bid for the company. Apollo closed the week at $8.95.

On the block: GNC Holdings Inc. shares rose 7 percent to $26 Monday after it said it was considering a sale of the company. The specialty health retailer's stock closed the week at $25.94.

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