Sierra Space, founded in 2021 and headquartered in Broomfield, Colorado, United States, has raised $1.74 billion in total funding, with a $1.41 billion Series A round in November 2021. The company, focused on space systems and commercial spaceflight, provides solutions for spaceplanes, propulsion, space station habitats, and more. With a valuation of $5.3 billion as of September 2023, Sierra Space is set to play a leading role in the future of space exploration, research, and infrastructure.