After Eddie Morra comes back from the police station, he finds Carl watching a news report about the secret merger they were about to close.
Carl is obviously angry and the following dialogue happens:
Carl: Have you been talking to anyone?
Eddie: No I haven't been talking to anyone, Carl. I'm not stupid.
Carl: I know you're not stupid, Eddie, but don't make the classic smart person's mistake thinking no one's smarter than you.
Maybe this is completely irrelevant to the plot, but just in case:
Who leaked the news about Carl van Loon's merger with Atwood?
Carl accuses Eddie, but we (the viewer) know it wasn't him. Atwood, his wife and Carl all wanted the merger to happen, so they had no motive.
Does the movie give any clue who actually did leak the news and by that stop the merger from happening?