Nearly 60% of privately held U.S. companies valued at over $1 billion were founded or co-founded by individuals born outside of the United States. This figure rises to 66% when including companies established by the children of immigrants. A total of 455 companies meet these criteria, representing a significant portion of the 775 total companies analyzed. The data highlights the substantial contribution of immigrants to the American technology sector and economic growth. These founders transitioned from international students and new arrivals to leaders in the tech industry. The findings underscore the impact of immigration on innovation and entrepreneurship within the U.S. economy, demonstrating a clear link between foreign-born talent and high-value company creation.