Bill Ackman dumps $1 billion stake in Berkshire Hathaway. Bill Ackman’s Pershing Square Capital Management is off to its strongest start to a year on record, reporting a roughly 25 percent return on its investments so far in 2019. Billionaire investor Bill Ackman's Pershing Square Tontine Holdings Ltd., a "blank check company," filed for an initial public offering to raise $3 billion. More On: bill ackman. Warren Buffett, Berkshire Hathaway’s chairman, trailed … Famed hedge-fund manager Bill Ackman made a splashy announcement this week when he unveiled a $3 billion share offering for a new blank check company called Pershing Square … Bill Ackman wants blank-check IPO of up to $6.5 billion. The Pershing Square Foundation supports exceptional leaders and innovative organizations that tackle social issues and deliver sustainable impact. COVID-19 Update: During these devastating and uncertain times, the Pershing Square Foundation is closely coordinating with a number of our partners who are providing invaluable services to those in need. Dark Mode Home ... Bill Ackman Pershing Square Capital Management, L.P. Last update 2020-06-06 10 Stocks (2 new) Value $6.57 Bil Turnover 35 % Billionaire activist investor Bill Ackman’s Pershing Square Capital Management has confidentially filed in the U.S. for an initial public offering of a blank check company, according to a … While Bill Ackman’s Pershing Square is in the green this year, Berkshire Hathaway has fallen almost 18% in 2020. View the current portfolio and top holdings for Bill Ackman. Pershing Square CEO Bill Ackman Bloomberg via Getty Images. Detailed information include number of shares and portfolio weight.