InterWest Partners focuses on early-stage investments in life sciences and information technology companies. Within the life sciences sector, the firm invests in a range of early-stage opportunities including the funding of preclinical companies with great potential. They also consider investing in or starting new companies around clinical or commercial stage assets. Within the information technology sector, InterWest looks for early-stage companies with near-term ROI-based value propositions. They favor investments in development-stage companies. Investments average $10 million to $15 million over the life of a company. InterWest serves as the lead investor in the majority of their investments.