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Billions is absolutely based on reality. Steve Cohen / SAC Capital.

As if hedge funds only trade stocks. As if LIBOR was the only thing ever fixed.

He can't buy all the companies. That's only 1% of just the NYSE market cap.

What is the max size of asset that can profit 4%/yr alpha from insider trading?

I think he means any of the companies, not all at once. And I'll note again that stock picking is not what their fund does anyway.