Numerous big-name hedge fund managers have been skeptical of the stock market's swift bounce back from its March low.
Billionaire investor Howard Marks joined a growing chorus of notable investors in warning that the market rebound has gone too far.
Hayman Capital's Kyle Bass also said "there's no better time" for the U.S. to crack down on Chinese companies such as Huawei.
The Nasdaq has led stocks back from the coronavirus crash March bottom, but market history since 2000 suggests that the Dow Jones Industrial Average could start playing catch-up.
"It's hard to create a valuation for businesses," billionaire entrepreneur Mark Cuban told CNBC.
The S&P 500 dividend yield is now nearly three times that of the 10-year Treasury yield, Bank of America said.
"There should be some amount of fans in the stadiums, depending on what locale and where you are and what the local rules are," Carolina Panthers owner David Tepper told CNBC.
The market is by anybody's standard pretty full," the billionaire founder of Appaloosa Management told CNBC.
"There's a curious disconnect between when you speak to the companies, most of which are closed, and what's going on in the market," CNBC's Jim Cramer said Wednesday.
Bridgewater Associates founder Ray Dalio and activist investor Nelson Peltz also made the Top 10 on Institutional Investor's annual list.
The bllionaire hedge fund manager said mass production of ventilators is a key part of ending the lockdown period from the coronavirus crisis.
Billionaire investor David Tepper said he is "nibbling" at some stocks, particularly in the tech sector, as the broader market tumbles amid the coronavirus outbreak.
As of Monday, more than 375,000 cases of coronavirus have been reported, resulting in at least 16,100 deaths.
Stocks pointed to declines on Monday as investors await a stimulus package from the coronavirus.
"If this in the end of monetary policy, obviously, he wants more leadership. We all want more leadership," CNBC's Jim Cramer said Monday.
"What made him successful on the court ... is the same thing I saw from him in business," said billionaire entrepreneur Michael Rubin.
"I love riding a horse that's running" and continue to do so to a point, Tepper said. Druckenmiller added, "I am still 'riding the horse' and bullish immediate term."
On "Squawk Box" on Sept. 24, 2010, Tepper said that Fed efforts to support the economy with near-zero interest rates and massive bond buying will make most investment choices go up.
Allergan shareholders will receive 0.8660 AbbVie shares and $120.30 in cash for each share held, for a total value of $188.24 per Allergan share.
Allergan said its experimental add-on treatment for depression failed three late-stage studies, casting doubts over its drugs pipeline.