ETFs (exchange-traded funds) are investment funds traded on stock exchanges. Herb Greenberg explains.
CNBC's Herb Greenberg discusses the low level of short selling in the market. He thinks what gets squeezed fast falls even faster.
CNBC contributor Herb Greenberg weighs in on the closing of at least 85 percent of Corinthian Colleges operating locations.
TheStreet's Jim Cramer says Herb Greenberg has convinced him that the problem with Valeant Pharmaceuticals is that the company must make deal after deal to keep going.
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