Pro Picks: Watch all of Friday's big stock calls on CNBC

Mario Gabelli of Gamco Investors, Yung-Yu Ma of BMO Wealth Management, Jim Lebenthal of Cerity Partners, Jon Najarian of MarketRebellion.com, Shannon Saccocia of SVB Private Bank, and Brenda Vingiello of Sand Hill Global Advisors on why they are buying, selling, or holding specific stocks and ETFs.