(Reuters) -Tesla is the worst-performing large-cap stock this year, thanks to declining electric vehicle demand, Chief Executive Elon Musk's political controversies over his ties to far-right groups, and now, his public feud with President Donald Trump.

Tesla shares slumped on Thursday, after Trump on social media threatened to cut off government contracts with Elon Musk's companies, following Musk's sharp criticism of the president's signature tax and spending bill on his X social media platform.

The market capitalization of Tesla Inc has fallen 29.3% to $917 billion so far this year, the biggest drop among big companies in the world.

Tesla, which ranked eighth globally in market capitalization at the beginning of the year, slipped to tenth as of June 5.

The company's shares rose in e

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