SoftBank's Vision Fund may be the first — and last — $100 billion investment vehicle. SoftBank CEO Masayoshi Son planned for it to be the first of a succession of gigantic funds, but it performance to date has been poor; it lost $10 billion in value in the March quarter of this year alone and is now worth less than what backers invested in it. The fund's poor performance has highlighted the flaws inherent in trying to invest $100 billion in startup companies in little more than three years.