What Carl Icahn and some other top investors are doing with their money

Jeffrey Smith, chief executive officer and chief investment officer at Starboard Value LP.
David Paul Morris | Bloomberg | Getty Images

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Some of the top activist investors made their cases for changes at companies they've invested in at the 13D Monitor Active-Passive Investor Summit. 

Thursday's gathering featured discussions and investment pitches from billionaire investors Carl Icahn, Jeff Smith and Keith Meister. Icahn also commented on the overall market.

Below are some of the highlights from the conference: