Elon Musk loses $15 billion in net worth after Tesla stock sinks

Elon Musk's new political party is prompting a Tesla stock sell-off.

Dado Ruvic/REUTERS

• Tesla shares fell nearly 7% after Musk launched the America Party, escalating a feud with Donald Trump.
• Musk lost $15 billion in net worth following the sell-off, per the Bloomberg Billionaires Index.
• Investors disapprove of Musk's political moves, with some analysts downgrading Tesla's stock rating.

Tesla CEO Elon Musk formally launched his new political organization over the weekend ...