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Sky's the limit: Skyworks Solutions jumped 13 percent to $88.67 Friday after the semiconductor products maker reported better-than-anticipated quarterly results and touted sales growth beyond its dominant customer, Apple.

Trump effect: Tiffany fell 3 percent to $79.60 Tuesday after the jeweler said revenue during the holiday season was weaker than expected, citing a 14 percent drop at its flagship store in New York. It blamed at least part of the drop on "postelection traffic disruptions." Its Fifth Avenue store is steps away from Trump Tower. Shares closed the week at $79.42.

Powered up: NRG Energy rose 5.3 percent to $15.37 Tuesday after an investment firm run by activist investor Paul Singer disclosed an ownership stake in the power company. Shares closed the week at $16.11.

Rail uproar: CSX soared 17 percent to $43.39 following reports that it was being targeted for a shake-up by activist investors. CSX shares finished the week at $44.33.

Deal making: Oil and gas company Noble Energy rose 6.3 percent, to $39.74, Tuesday after it agreed to buy Clayton Williams Energy for $2.7 billion. The deal includes tens of thousands of acres in Texas that are directly adjacent to Noble Energy holdings. The stock closed Friday at $40.21.

Tariff talk: U.S. Steel shares rose 6.9 percent to $34.47 Wednesday after Donald Trump's Commerce Secretary nominee Wilbur Ross signaled the incoming administration will levy more tariffs and anti-dumping duties on imported Chinese steel. The stock closed Friday at $31.14.

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