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Tesla

Tesla, Inc., originally Tesla Motors, was incorporated in July 2003 by Martin Eberhard and Marc Tarpenning. Both men played active roles in the company's early development prior to Musk's involvement. Musk led the Series A round of investment in February 2004; he invested $6.35 million, became the majority shareholder, and joined Tesla's board of directors as chairman. Musk took an active role within the company and oversaw Roadster product design, but was not deeply involved in day-to-day business operations.

Following a series of escalating conflicts in 2007, and the financial crisis of 2007–2008, Eberhard was ousted from the firm. Musk assumed leadership of the company as CEO and product architect in 2008. A 2009 lawsuit settlement with Eberhard designated Musk as a Tesla co-founder, along with Tarpenning and two others. As of 2019, Musk was the longest-tenured CEO of any automotive manufacturer globally. In 2021, Musk nominally changed his title to "Technoking" while retaining his position as CEO.

Tesla began delivery of the Roadster, an electric sports car, in 2008. With sales of about 2,500 vehicles, it was the first serial production all-electric car to use lithium-ion battery cells. Tesla began delivery of its four-door Model S sedan in 2012. A crossover, the Model X was launched in 2015. A mass-market sedan, the Model 3, was released in 2017. In 2020, the Model 3 became the all-time bestselling plug-in electric car worldwide, and in June 2021 it became the first electric car to sell 1 million units globally. A fifth vehicle, the Model Y crossover, was launched in 2020, and in December 2023, became the best-selling vehicle of any kind, as well as the all-time best-selling electric car. The Cybertruck, an all-electric pickup truck, was unveiled in 2019, and delivered in November 2023. Under Musk, Tesla has also constructed multiple lithium-ion battery and electric vehicle factories, named Gigafactories.

Since its initial public offering in 2010, Tesla stock has risen significantly; it became the most valuable carmaker in summer 2020, and it entered the S&P 500 later that year. In October 2021, it reached a market capitalization of $1 trillion, the sixth company in U.S. history to do so. In November 2021, Musk proposed on Twitter to sell 10% of his Tesla stock, since "much is made lately of unrealized gains being a means of tax avoidance ". After more than 3.5 million Twitter accounts supported the sale, Musk sold $6.9 billion of Tesla stock within a week, and a total of $16.4 billion by year end, reaching the 10% target. In February 2022, The Wall Street Journal reported that both Musk and his brother Kimbal were under investigation by the Securities and Exchange Commission (SEC) for possible insider trading related to the sale. In 2022, Musk unveiled Optimus, a robot being developed by Tesla. In June 2023, Musk met with Indian Prime Minister Narendra Modi in New York City, stating he was interested in investing in India "as soon as humanly possible".