Pipeline flowing: Columbia Pipeline Group climbed 6 percent to $24.84 Friday after TransCanada Corp. agreed to buy the company for $10 billion, or $25.50 per share, in an attempt to expand further into the U.S.

Burned: Williams-Sonoma lost 6.3 percent, to $55.71 Thursday after the seller of cookware and home furnishings disclosed disappointing fourth-quarter results and gave a disappointing outlook for 2016. Weak performance at Pottery Barn was a key factor. Shares closed Friday at $56.73.

Check-in: Starwood Hotels jumped 8 percent to $75.93 Monday after a consortium led by China's Anbang Insurance Group offered to buy the hotel chain for $14 billion. On Friday, Starwood said it would terminate a plan to be acquired by Marriott International. Starwood shares closed the week at $80.57.

Food play: The Fresh Market jumped 23.5 percent, to $28.39 Monday after private equity firm Apollo Global said it will buy the grocery store chain for $1.3 billion, or $28.50 per share. The stock closed Friday at $28.52.

Study surge: Drug developer GW Pharmaceuticals more than doubled Monday to $84.71 after it reported positive results from a late-stage study of its drug Epidiolex, an experimental seizure disorder treatment. GW shares closed the week at $72.72.

Valeant tumbles: Valeant Pharmaceuticals' preliminary fourth-quarter profit disappointed investors and the drugmaker cut its estimates for 2016. It's already under scrutiny from Congress over drug prices. The stock dropped 30.9 percent, to $47.70 Tuesday. Shares closed the week at $26.98.

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