American and other stock markets have felt the tremors after US President Donald Trump and his wealthy former colleague Elon Musk started insulting each other on a personal level. After the share price of Tesla fell by 14.3 percent in one day on Thursday, the company's market value has decreased by more than 150 billion US dollars. Because of this, Tesla has also dropped out of the list of the 10 largest companies in the world. This incident has also had a great impact on Musk's personal wealth. He has lost about 34 billion dollars in one day.

This fall in the stock market came after Musk strongly criticized the budget bill proposed by the Trump administration as 'disgusting and unforgivable' on the social network X . The bill plans to introduce massive tax cuts and regulatory flexibility. However, economists are criticizing such a move saying that the federal budget deficit will increase by 24 trillion US dollars in the next decade . Musk openly disagreed with Trump's policies and plans, criticized those who were in favor of the bill, and called his lawmakers to criticize it, saying that if this trend continues, America will collapse.

After Musk openly protested, Trump also responded aggressively through social media and media. He has accused Musk of being on his side as long as his interests are there and now he is being criticized when he is not what he says. "I'm very disappointed," Trump said in a press conference with the head of state of Germany.

Trump's former advisor Steve Bannon and others have made expressions such as that Musk's company should be taken over and he should be deported. Musk has posted one after another against Trump and his policies, alleging that Trump is included in the list of child sexual abusers called the 'Epstein File'. Musk has also challenged Trump saying that he won the election himself.  

This dispute is not limited to the media and has directly affected the stock market as well. The S&P 500 index fell 1.4 percent while the Nasdaq Composite fell 2.1 percent. Shares of technology and green energy companies were particularly affected on this day. Shares of other EV companies like Rivian, Lucid Motors also fell by 5 percent to 9 percent .

'It's not just about Tesla,' said Victoria Green, head of G Squared, 'it's the market's perception of political risk in the technology sector . When the president publicly attacks a CEO like this, the market doesn't like it, it brings uncertainty .'

Tesla's situation is complicated now. The US Department of Transportation is investigating its 'fully automated driving software'. In addition, the company is facing a serious decline in sales of its traditional electric vehicles and the challenge of transitioning to expensive robotaxi models . According to analysts at Wedbush Securities, Tesla's AI and automation-based strategy could significantly increase the company's valuation if regulatory hurdles don't get in the way.

"Ilan's political moves are constantly affecting its share price and brand," said Dennis Dick, a stock market strategist, "First, when he supported Trump, liberal-minded customers left, now the right-wing is also leaving after opposing Trump, this is a loss for both sides."

This dispute has also affected the international market. Japan's Nikkei 225 index fell 1.8 percent, while Germany's DAX fell 1.2 percent. Shares of car makers and chip makers saw significant declines on Thursday. According to analysts, if Trump carries out his threat to impose tariffs on foreign battery products, it could affect global EV policy and trade .

Trump's threat to remove subsidies related to Musk is also being analyzed as another challenge for Musk's business . A report published by the Washington Post in February showed that Musk's companies, mainly SpaceX, Starlink and Tesla, have received more than $38 billion in government grants, loans, tax breaks and contracts. Among them, Musk, who received two-thirds of that amount in the last 5 years, received work worth 6.5 billion US dollars from the federal and local governments in 2024 alone.