DBL Partners, an investment fund based in the San Francisco and Palo Alto area, recently announced the closure of an impact investing fund worth $400 million. This fund is the largest so far in the impact investing space and will focus on companies in the sustainable energy, products and services, digital media and imaging, healthcare and IT sectors. DBL has been able to spot successful, social companies in the past (most notably, by investing in Tesla Motors at the early stages), so it will be interesting to see where they spend this money in the future.