Ackman also told ADP that CEO Carlos Rodriguez "should be replaced". However, ADP added that it doesn't want to push back the deadline.
While Ackman may be able to score points with criticism of the company's strategy, he may find it hard to challenge Rodriguez given his track record as CEO, some analysts said.
The Roseland, N.J., human-resources software company said its board unanimously rejected the "last-minute" request, as the deadline for board nominees has been public for almost a year.
The embattled activist investor is seeking to install five dissident director candidates onto ADP's 10-person board and he's seeking a seat for himself.
The current board has "an effective balance of leadership continuity and fresh perspectives" that will help ADP to further its goals, said the statement.
Prior to building Pershing's position in ADP, Ackman approached a number of his hedge fund investors to raise money earmarked only for the ADP bet through a special goal vehicle, sources familiar with the fundraising said.
ADP also couldn't resist taking a swipe at Pershing Square's recent weak performance.
Shares in Chipotle, on which Pershing Square spent about $1.17 billion previous year, are down more than 17 percent since the stake was disclosed.
Ackman met with Rodriguez on Thursday and asked to postpone the nomination deadline but was told no, two sources told CNBC. The company's market value was about $50 billion as of Thursday's close.
Pershing Square is said to have acquired an 8 percent stake in ADP through derivatives, which are not subject to the same disclosure requirements as stock. Pershing Square's return over the same period is 29 percent, the statement claimed.
ADP stock was down slightly as of Friday morning, but is up 8% year-to-date.
It would ensure that the majority of immigrants admitted to the United States are highly-skilled and able to support themselves. It also sets a 50,000 annual cap on refugees, instead of a level mandated by the president.
But while three of the nine Monetary Policy Committee members voted for a hike in July, just two backed an increase this month. On the other hand, they downgraded some of their forecasts, especially for wage growth in 2018.
Based on a Pentagon budget request , the Air Force has the budget to spend almost $3.2 billion on these modifications. The new planes are expected to be ready between 2020 and 2024, depending on how the outfitting goes.
In light of this, the USA saber-rattling near North Korea's borders is only adding fuel to the fire, the journalist warned . If China does not change its posture, the USA should take clear and firm action to seek to ensure China's cooperation.
Airport spokesman Doug jaeckel said that the builders who were working near detained the teenager until the police arrived. A 17-year-old boy jumped off from an airplane on Tuesday by opening its emergency door.
Now, the ranking algorithm update will force developers with buggy apps to address their issues or have penalised as a result. Find out how crowdtesting can ensure your digital product works in the real world.
The July 13 New York State poll found voters support constitutional convention; women's right to choose gets strongest support. The May 11 national poll found 21% of US voters approve of revised GOP health plan; voters reject Trump tax plan nearly 2-1.
Ryan added that the sanctions directly target "the destructive and destabilizing activities of Iran , Russia, and North Korea". The news agency says senior officials from 92 countries are in Tehran for an oath-taking ceremony Saturday.
Rumor: Xbox One Spotify App in Testing, Could Release Soon
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1 dead in possible building collapse in Minneapolis
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Family of boy encouraged to kill self 'haunted'
For many experts judiriques, the outcome of the trial could be precedent-setting, and weigh in other cases involving adolescents. The ruling marks the first time a case of cyberbullying has resulted in a homicide conviction because of a victim's suicide.
Library to host Solar Eclipse Block Party
But for most USA residents, this eclipse will be seen as a partial eclipse - Northeast Wisconsin included. In western MA we will see a partial eclipse of the Sun with roughly 72 percent of it covered by the Moon.
China Hits Back at Trump on North Korea
If Trump doesn't act, it will be another sign to the North Koreans that they can do as they please with no consequences. He and many other lawmakers continue to call on China to help thwart North Korea's nuclear program.
US Missions Set To Cut Up To 300 Diplomatic Staff
The move came following United States lawmakers' decision to approve a new round of sanctions against Russian Federation. The seizing of property used by the Russian diplomats in the USA started with the out-going Obama administration.