July 7–8, 2025: The first trading day since Musk’s weekend announcement, Tesla shares tumbled, and Musk’s personal fortune dropped by as much as $15 billion, according to the Bloomberg Billionaires Index. As of July 9, it stands at $349 billion with Tesla shares broadly unchanged.

Tesla shares sank Monday after CEO Elon Musk announced he would form a new political party in an escalation of his feud with President Donald Trump.

Tesla stock price fell Monday after Musk said he's formed the America Party, the latest development in the billionaire's feud with President Trump.

Tesla CEO Elon Musk has announced plans to launch a new political party, sending Tesla's stock tumbling and roiling the markets. Tesla shares fell as much as 7.6% in pre-market trading before slightly recovering.

Tesla shares fell sharply in early trading Monday after CEO Elon Musk said he will launch a new political party.

Mr. Musk’s involvement in politics and his financial support for the president’s campaign were once seen by investors as a benefit to Tesla, fueling a steep rise in company shares after the election last year. That association has now turned into a liability. Tesla shares are down 40 percent from their peak in December.

President Trump on Sunday issued a lengthy Truth Social post attacking former ally Elon Musk after the Tesla mogul announced he was launching a third party over opposition to Trump’s “big, beautiful bill.” “I am saddened to watch Elon Musk go completely ‘off the rails,’ essentially becoming a TRAIN WRECK over the past five weeks,”…

Ross Gerber, a longtime Tesla investor and vocal Musk critic, didn’t hold back online, writing in his own post that, “no one wants the Elon first party,” accusing the company’s board of being “Elon vampires sucking the blood of Tesla equity.”

Elon Musk isn't done with politics just yet. Days after the SpaceX and Tesla CEO threatened to form his own political party as an alternative to America's "Democrat-Republican uniparty," Musk has announced his pledge to do so.

Tesla (TSLA) shares lost about 7% on Monday after billionaire Elon Musk announced plans to launch a new political party – the “America Party.” Musk’s announcement arrives on the heels of his very public feud with President Donald Trump.