As Ackman's fund, Pershing Square, pushing for control of the board at ADP, the company highlights that the fund has underperformed ADP in recent years.
Top ex-regulators and activist investors, including former Federal Reserve chief Ben Bernanke and Third Point's Dan Loeb, will offer advice to the annual SALT hedge fund conference this week.
Everything that happened at Sohn 2017.
Volatility sank to its lowest level since 1993 to begin the new week as indexes held close to their flatlines.
Howard Hughes shares spiked upwards about 4% on the news, trading at $126.50 a shares Monday afternoon.