CNBC's Bob Pisani spoke with Matthew Tuttle of Tuttle Tactical Management, Sylvia Jablonski, CIO of Defiance ETFs, and Harry Whitton, Head of ETF Sales Trading at Old Mission Capital. They discussed some of the hottest thematic investing trends in the ETF business, including SPACs and the hydrogen economy. Plus, a "fomo" fund is gearing up to launch later this year as more and more investors look to chase momentum in this market. In the 'markets 102' portion of the podcast, Bob continues the conversation about "fomo" with Matt Tuttle of Tuttle Tactical Management.