Roku, Amazon, and Peloton are some of today's stock picks: Pro Market Movers Feb. 18

Jim Cramer, Karen Firestone of Aureus Asset Management, Michael Morris of Guggenheim Securities, Michael Nathanson of MoffettNathanson, Ranjan Roy of Margins, Jason Snipe of Odyssey Capital Advisors, Josh Brown of Ritholtz Wealth Management, Brian Smoluch of Hood River Capital Management, and Danielle Shay of Simpler Trading explain why they are buying, selling, or holding specific stocks and ETFs.