BlackRock CEO Larry Fink thinks the markets may be at a risk for a melt-up.
"I think we have a risk of a melt-up — not a meltdown here," Fink told CNBC's "Squawk Box." "Despite where the markets are in equities, we have not seen money being put to work. We have records amounts of money in cash. We still see outflows in retail in equities, we still see outflows in institutions."
A melt up, as defined by Investopedia, is an unexpected improvement in the investment performance of an asset class, driven partly by a stampede of investors who don't want to miss out on its rise.
According to Fink, right now investors may be at risk of under-investment in equities, which could lead stocks to rally even more in 2019 as more money jumps back into the markets.
"The marketplace — with the market rally as large as it is — I would clearly tell you at this moment most investors are exposed by being under-invested at this time," Fink said.
The iShares MSCI ACWI exchange-traded fund, which tracks global stocks, is up more than 15% this year, and the S&P 500 has rallied nearly 16%, according to CNBC.