UPDATE 2-Kerkorian sells off Ford shares at deep loss

(Recasts first paragraph; adds Ford declining comment)

DETROIT, Dec 29 (Reuters) - Billionaire investor Kirk Kerkorian has sold off all of his remaining shares of Ford Motor Co (F.N), completing a retreat from a high-profile stake in the No. 2 U.S. automaker that cost him hundreds of millions of dollars.

A spokeswoman for Kerkorian's investment firm, Tracinda Corp, said that the firm's remaining Ford shares had been sold. A spokesman for Ford had no comment on the development.

Tracinda, which briefly ranked as Ford's largest outside investor, said in a regulatory filing in October that it had begun working with bankers to sell the 133.5 million shares of the No. 2 U.S. automaker it still held at that time.

It was not immediately clear when Tracinda had completed those remaining sales of Ford stock over the past two months.

The pullout from Ford by Kerkorian caps a two-year period during which the activist investor took a run at all three Detroit-based car companies as they struggled to restructure.

Kerkorian, 91, previously held a nearly 10 percent stake in General Motors Corp GM.N and made a failed bid for Chrysler LLC last year.

Since October, he has been cutting his losses on a $1 billion investment in Ford that had lost most of its value.

It was not immediately clear how deep Kerkorian's losses on the Ford investment were. But even if Tracinda sold all its remaining shares at the recent high for Ford stock, the firm would have been facing a loss of some $475 million based on its average acquisition cost for the shares.