Bill Ackman’s Pershing Square Capital Management sponsored the largest SPAC IPO in history, raising $4B in capital. In an exclusive CNBC interview, the hedge fund billionaire makes his pitch for the insider baseball market vehicle: the special-purpose acquisition company. “Much better for the issuer, much better for the shareholder, because they get to make a thoughtful decision that’s not rushed by the typical IPO process.” Plus, four months after his “Hell is coming” comments rocked the markets, Ackman, a famous short seller, explains why less than a week after that warning, he profited over $2 billion.