Ackman’s Pershing Square Holdings plummets 18.6% in 2016 Posted on February 11, 2016 at 8:14 am. On top of its 20.5% loss in 2015, Pershing Square Holdings is down another 18.6% in 2016, disclosed an investor. [Read More]To access this content, you must be a member. Visit the Plans page for details.