Elon Musk's SpaceX is preparing to list on the electronic stock market the Nasdaq this Friday and when it does it's expected to be the largest Initial Public Offering or IPO in history. Its valuation is approaching three point one trillion New Zealand dollars (that's trillion with a T) and if that happens it would immediately rank among the world's most valuable listed companies. But it's not without controversy. Paul Brownsey is a General Partner at the Bridge West Venture Fund and Independent Chair of the Mint Asset Management Investment Committee, he chats to Jesse.