Not buying: American Express fell 1.8 percent to $98.03 Friday after the credit card issuer suspended its share buyback program for six months.

Deal or no deal: Viacom dropped 5.8 percent to $31.80 Tuesday after following several reports saying the media company is not in talks to merge with CBS Corp. Viacom shares closed Friday at $39.20. CBS, which rose 1.7 percent, to $33.36 on the news, closed the week at $57.75.

High-voltage buyout: Energizer Holdings surged 13.1 percent to $58.40 Tuesday after the company said it will acquire the battery and lighting assets of Spectrum Brands, which includes the Varta and Rayovac battery brands. Energizer shares closed Friday at $54.33. Spectrum, which rose 3.7 percent, to $124.99 on the news, closed the week at $121.34.

Booked: La Quinta rose 3.8 percent to $20.18 Thursday after Wyndham Worldwide agreed to buy its hotel franchise and management business in a $1.95 billion cash deal. LaQuinta shares closed Friday at $20.18. Wyndham shares, which gained 4.8 percent to $122.73 on the news, closed the week at $126.99.

No charge: General Electric shares slid 3.6 percent to $18.05 Tuesday after the company said it was taking a $6.2 billion charge related to its insurance portfolio. GE closed Friday at $16.26.

Deal bounce: Juno Therapeutics soared 48 percent to $67.76 Wednesday after media reports that biotech drugmaker Celgene might buy it. The stock finished the week at $67.81.

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