Healthy choice: The consolidation of the nation's health insurers continued when Anthem agreed to buy Cigna for $54 billion on Friday. Anthem shares fell 3 percent to $150.86, and Cigna shares fell 5.6 percent to $145.72.

Amazon primed: The online retailer surprised investors on Thursday by posting a second-quarter profit. Revenue also far exceeded expectations. On Friday, its shares rose 10 percent to $530.50, giving it a market cap of $243 billion, higher than Wal-Mart's $230 billion.

Cruise control: Shares in General Motors surged 5 percent, to $31.78 Thursday after the automaker's second-quarter earnings, fueled by North American truck sales, handily beat financial analysts' forecasts. The stock finished the week at $31.06.

Apple soured: Apple sank 5 percent, to $124.64 Thursday, a day after the company gave a cautious outlook for the current quarter and didn't provide much detail on how its new smartwatch was doing. The stock closed Friday at $124.50.

Revenue miss: IBM slumped 6 percent to $162.56 after a mixed earnings report late Tuesday. The business software company's revenue fell short of financial analysts' forecasts. The stock finished the week at $159.75.

Dividend gone: Chesapeake Energy slid 7 percent to $9.60 Wednesday on news that the energy company has axed its annual dividend and will redirect the money into its 2016 capital spending program. The move comes as natural gas and crude are in an extended decline with few signs of a rebound. The stock closed out the week at $8.28.

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