By May 2012, — ten years after founding—SpaceX had operated on total funding of approximately US$1 billion over its first decade of operation. Of this, private equity provided approximately US$200 million with Musk investing approximately US$100 million and other investors (Founders Fund, Draper Fisher Jurvetson, etc.) having put in about US$100 million.[93] The remainder had come from progress payments on long-term launch contracts and development contracts, as working capital, not equity.