Freeport-McMoRan Inc (NYSE: FCX ) 's stock opened 1% higher today following news of Carl Icahn 's increased interest in the mining and energy company. According to a newly-amended filing with the Securities and Exchange Commission, Icahn Capital may be deemed to own exactly 100 million shares of Freeport-McMoRan, or 8.8% of the company's common stock. Just 7.59 million of those shares were purchased by affiliated funds, while the remaining are shares underlying forward contracts. Since his initial filing in late August, Icahn has added exactly 12 million shares underlying forward contracts to his holding.