A further piece of research from Wealth-X Billionaire Census showed that the world's billionaires are holding more than $1.7 trillion in cash. The report said that billionaires are taking money off the table where available, while uncertainties in the economy and the historical highs found in deals have resulted in cash-flush portfolios.
"Holding cash is surely a bad sign for investor confidence but it is perfectly rational," Alastair Winter, chief economist at Daniel Stewart told CNBC via email.
"Equity and bond prices are largely being propelled by central banks both directly through their loose monetary policies and indirectly by market expectations that those policies will be maintained indefinitely. Holding cash is a trend currently but a rapid pick-up in inflation would make many investors uneasy about that too."
Traditional forms of investment such as bonds have seen their yields at record lows due the current market uncertainty post the U.K.'s vote to leave the European Union. The uncertainty has also led to volatility and fluctuations in the forex and equity markets which means investors need to be very smart when putting their money into these forms of investments.
The Dow, the S&P and Nasdaq posted record highs for the first time since 1999 amid investors eyeing rising oil prices and strong second-quarter results from earnings giant Macy's and Kohl's. The sentiment in the Wall Street quickly saw Asian stocks rally on Friday but couldn't continue on to Europe that saw mixed performance from indices.
But with global stocks rallying at these levels, the big question is if this sentiment is sustainable.
"I think the momentum has been bullish for a while and that should probably continue at least for a very short term," Sandy Jadeja, chief market strategist at SignalPro told CNBC on Friday.
"Technical data shows that the divergence pattern is coming up and the strength will not sustain itself for too long."