Food intrigue: Kraft Heinz shares rose 11 percent to $96.57 Friday after it confirmed that it made an offer to buy European consumer goods giant Unilever and had been rejected. Unilever's U.S.-listed shares jumped 14 percent, to $48.53 Friday.

Unhealthy: Molina Healthcare Inc. shares plunged 18 percent to $49.35 Thursday, the day after the California-based insurer said losses related to its participation in the Affordable Care Act marketplace led to "clearly unacceptable" earnings for 2016. Molina shares closed the week at $48.23.

Social good: Groupon shares jumped 23 percent to $4.64 percent Wednesday on strong revenue after the company reported earnings for the first time since announcing its acquisition of Living Social in October. Groupon shares closed Friday at $4.66.

Car talk: General Motors jumped 4.8 percent, to $37.21 Tuesday following news that France's PSA Group, maker of Peugeot and Citroen cars, is exploring a deal to buy Opel, GM's money-losing European business. GM shares closed Friday at $37.22.

Major lasers: Cynosure shares rose 28 percent to $65.93 Tuesday after the maker of devices used in laser body contouring agreed to be bought by Hologic. Cynosure shares closed Friday at $66.25. Hologic shares, down 3.8 percent to $38.51 on the news, closed the week at $40.

Cool buyout: Zeltiq Aesthetics jumped 13.3 percent, to $55.95 Monday after Allergan said it would buy the company, whose CoolSculpting system helps people reduce bulges of fat. Zeltiq closed Friday at $55.67.

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