Pershing Square Discloses Zoetis Stake — and Sachem Head Pact
The two hedge fund firms have worked together in the past, including on Valeant Pharmaceutical’s pursuit of Allergan.
Stephen Taub
December 17, 2025
Bloomberg Photo Service 'Best of the Week': William "Bill" Ackman, founder and chief executive officer of Pershing Square Capital Management LP, speaks during an event in New York, U.S., on Tuesday, July 22, 2014. Herbalife Ltd. shares fell the most in three months yesterday after billionaire Ackman vowed to show Enron Corp.-like fraud at the seller of supplements and weight-loss shakes. Photographer: Jin Lee/Bloomberg *** Local Caption *** Bill Ackman
Jin Lee/Bloomberg
