Sept 25 (Reuters) - Masimo ( MASI ) said on Wednesday

that Joe Kiani has decided to resign as CEO, days after

shareholders voted to remove him from the company's board.

The medical device maker has named Michelle Brennan as

interim CEO, effective immediately.

The shareholders last week elected both director candidates

proposed by activist investor Politan Capital Management and

took the unusual step of removing Kiani, its longtime CEO and

founder, from the board.

Kiani had said in the past that he would quit as CEO and

sell his shares valued at roughly $500 million if investors

replaced him on the board with a Politan nominee.

Masimo ( MASI ) also said it has formally appointed the two director

candidates, Darlene Solomon and Bill Jellison, proposed by

Politan to its board.