"Investors are not looking at products that are invested like individual stocks," he said. "People prefer the liquidity you get in an ETF versus actively managed funds."
Bonds, meanwhile, are becoming less popular. "Investors are looking at bonds and realizing they are not a risk free asset anymore," Fink said
Earlier Thursday, BlackRock, the world's largest money manager, reported fourth-quarter earnings of $3.96 a share, topping expectations of $3.73 a share.