Social media platform founded as Twitter by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams in 2006. Acquired by Elon Musk in October 2022 for $44 billion and rebranded as X. Operates microblogging and social networking services.

Space Exploration Technologies Corp. Founded by Elon Musk in 2002. Develops rockets and spacecraft for commercial and government clients. Known for Falcon 9, Falcon Heavy, and Starship rockets, and Dragon spacecraft.

AI research organization founded in 2015 by Elon Musk, Sam Altman, Greg Brockman, Ilya Sutskever, Wojciech Zaremba, and John Schulman. Creator of ChatGPT, GPT-4, DALL-E, and Whisper. Mission: ensure AI benefits all of humanity.

American multinational automotive and clean energy company. Founded 2003 by Martin Eberhard and Marc Tarpenning. Elon Musk joined as chairman in 2004 and CEO in 2008. Produces electric vehicles, battery storage, and solar energy products.