Warren Buffett, Carl Icahn, David Einhorn, Dan Loeb and Bill Ackman have been making some major investment moves in recent months, as revealed in regulatory filings with the Securities and Exchange Commission this week. They've invested millions, if not billions, of dollars in companies like Apple (AAPL) , Herbalife (HLF) , Chipotle (CMG) and Goldman Sachs (GS) . And investors would be wise to pay attention: the five have a combined estimated net worth of about $98 billion.
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