In another move, he sold Micron for the CNBC trading contest.
Here's why Najarian bought the precious metals company.
Activist investor Jana Partners has taken new stakes in Alibaba, Alphabet, Facebook, Wells Fargo and Microsoft, according to an SEC filing reporting positions through the end of the second quarter.
Jim Cramer warns Tesla critics about getting their hopes up that the federal government will penalize Musk for his tweet about going private.
Square's stock is poised for further upside now that cumulative downloads of its Square Cash app have surpassed those of Paypal's Venmo for the first time, according to Nomura Instinet.
Professional investors have suddenly turned optimistic about U.S. stocks again, with bullish sentiment fed by an especially buoyant earnings season that is offsetting other concerns.