Investing.com - Institutional investors see great opportunities in the cryptocurrency market but are reluctant to invest because of key trading risk issues, according to a research firm report.Tabb Group says institutional players, such as hedge funds and pension funds, are holding back because of a lack of regulatory clarity, universal, reliable data and adequate market infrastructure.Tabb expects some of this to change soon because specialty firms are working on changes and improvements to the marketplace with institutional investors in mind.Trading in bitcoin futures was introduced on two conventional exchanges in late 2017, but there's been little else from Wall Street.Some market watchers say cryptocurrencies won't fully recover from their massive 2018 slide unless institutional investors enter the market.