NEW YORK — Carl Icahn's stake in Dell now stands at close to 9 percent, buttressing his claims that the fight for the embattled computer maker is not over.

Icahn disclosed in a regulatory filing late Monday that he's purchased an additional 4 million shares in Dell Inc. Icahn actually bought the shares Thursday, the same day he filed suit to block any delay in a shareholder vote over company control and a day before founder CEO Michael Dell boosted his bid.

Dell and investment firm Silver Lake Partners' latest buyout bid is $13.75 per share, with stockholders also receiving a special dividend of 13 cents per share. A shareholder vote on the offer is scheduled for Sept. 12.

Icahn has proposed a deal that he says is worth $15.50 per share.