UPDATE 1-Icahn's right-hand man Keith Meister to leave

* Icahn’s principal executive officer Meister resigns

* Daniel Ninivaggi named as replacement -- filing

* Meister served with Icahn on boards

NEW YORK, Aug 4 (Reuters) - Keith Meister, a key executive at billionaire activist investor Carl Icahn’s business holding company, said on Wednesday he would resign after eight years with the firm.

Meister, who has often been described as Icahn's right-hand man, was principal executive officer at Icahn Capital and also vice-chairman of the board of Icahn Enterprises L.P. IEP.N, a master limited partnership.

“Keith Meister is a very talented individual whom I enjoyed working with,” Icahn said in a statement. “I wish Keith the best of luck as he goes on to pursue other opportunities.”

Meister has often been Icahn’s pick to serve as director on a number of corporate boards and helped carry out Icahn’s activist investment strategies and often serving alongside the billionaire himself.

The company said in a Securities and Exchange Commission filing the company’s president, Daniel Ninivaggi, will serve as the principal executive officer of Icahn Enterprises GP starting on Wednesday.

Meister, 36, has been serving as a director at auto parts maker Federal Mogul Corp FDML.O and telecommunications companies Motorola Inc MOT.N and XO Holdings Inc XOHO.OB -- all companies in which Icahn has interests.

He was also among the names floated by Icahn to potentially join the board of Yahoo! Inc YHOO.O in his proxy fight with the company.

An Icahn executive would not comment further about whether Meister would continue his role on the corporate boards.

Icahn bought an additional 10.2 million shares in Motorola, according to a separate filing on Wednesday, bringing his total stake in the communications company to about 232.2 million shares, or almost 10 percent, of the company’s total shares outstanding. (Reporting by Emily Chasan; editing by Andre Grenon)