Uber, Zoom, and Roblox are some of today's stock picks: Pro Market Movers Feb. 17

Jim Cramer, Elliott Robinson of Bessemer Venture Partners, Jan Kniffen of J Rogers Kniffen Worldwide, Sarat Sethi of DCLA, Mike Mayo of Wells Fargo, and Cathie Wood of ARK Invest explain why they are buying, selling, or holding specific stocks and ETFs.