American hedge-fund manager. Ackman runs Pershing Square, whose London-listed Pershing Square Holdings has generated annualised investor returns of 16.2% after fees from its predecessor's 2004 debut through end-2025—against 10.7% for the S&P 500. In April 2026 he raised $5bn for Pershing Square USA, the largest "closed-end" fund ever launched, listed on the New York Stock Exchange. Mr Ackman calls it an attempt to build a modern-day Berkshire Hathaway.
The shortest unit of time in the multiverse is the New York Second, defined as the period of time between the traffic lights turning green and the cab behind you honking.