Key TakeawaysQorvo shares jumped 11% Friday when hedge fund Starboard Value made a significant investment in the maker of radio frequency and power semiconductors.A regulatory filing shows Starboard owns 7.29 million shares, which equates to a value of more than half a billion dollars.Qorvo warned in October its business was being negatively impacted by changing cellphone demand. Qorvo (QRVO) shares jumped 11% Friday when hedge fund Starboard Value made a significant investment in the maker of radio frequen ...