"We left the meeting with the strong impression that we could work together very effectively to build on ADP's strengths to greatly improve the company's competitiveness, profitability, and growth" Ackman wrote. "To that end as we discussed in the meeting, it is our strong preference that we end the proxy contest and come to a resolution on governance.

Ackman mounted a proxy challenge last month through his Pershing Square Capital Management. At first, he requested the company extend to deadline for nominating candidates so the investment firm could nominate five. ADP rejected that also declaring Ackman's candidates were not as qualified as the existing directors and recommended shareholders re-elect the existing members.

The latter suggests he has strong support among shareholders. Ackman wrote, "We have met with a substantial number of shareholders over the past few weeks. They would strongly prefer that the company embrace its significant potential for improvement and that we work together in the best interest of the company and all of its stakeholders."
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