CORRECTED-Ackman says he supports ADP but puts management on notice
April 17, 2018 at 22:28 PM EDT
NEW YORK, April 17 (Reuters) - Billionaire investor William Ackman, who lost a proxy contest at Automatic Data Processing last year, said on Tuesday that he wants the human-resources technology company to succeed but said he might be back with a fight if ADP fails to perform.