Gigafund is co-founded by PayPal and Founders Fund insiders who have backed Elon Musk's companies for over 20 years, giving them unusually deep access to Musk ventures and having invested over $1 billion into SpaceX alone since 2017. They run an extremely concentrated, multi-decade strategy focused on a handful of capital-intensive, physical-world technology companies like reusable rockets, brain-computer interfaces, and nuclear micro-reactors rather than typical software investments.