Phase4 Ventures is a leading venture capital firm based in London that invests in development stage life science companies in the US and Europe Phase4 Ventures' investments include many of the companies that have provided successful European and US venture exits including Intercell, Pharmion, Targacept and most recently Proteolix Phase4 Ventures Limited is a member of the British Private Equity and Venture Capital Association and the European Private Equity and Venture Capital Association