Bill Ackman shares his views on CNBC's "Halftime Report" Wednesday. :
"Those numbers are not correct and one of the things we're going to point out in a presentation we're going to release tomorrow is that the company overstates their total shareholder return under the CEO's track record," said the hedge fund manager, claiming ADP starts the calculation of the figure the day after the new CEO began, among other alleged mistakes. His hedge fund Pershing Square Capital Management has nominated three directors to Automatic Data Processing's board, including Ackman, for the Nov. 7 annual meeting.