A landmark study was just released by two professors, one from Harvard Business School and the other MIT, which reveals that, for the most part, angel-backed companies enjoy performance gains of 30-50% when compared to other non-funded startups.

From the executive summary:

What difference do angel investors make for the success and growth of new ventures? William R. Kerr and Josh Lerner of HBS and Antoinette Schoar of MIT provide fresh evidence to address this crucial question in entrepreneurial finance, quantifying the positive impact that angel investors make to the companies they fund.

Angel investors as research subjects have received much less attention than venture capitalists, even though some estimates suggest that these investors are as significant a force for high-potential start-up investments as venture capitalists, and are even more significant as investors elsewhere. This study demonstrates the importance of angel investments to the success and survival of entrepreneurial firms. It also offers an empirical foothold for analyzing many other important questions in entrepreneurial finance.

Key concepts include:

• Angel-funded firms are significantly more likely to survive at least four years (or until 2010) and to raise additional financing outside the angel group.
• Angel-funded firms are also more likely to show improved venture performance and growth as measured through growth in Web site traffic and Web site rankings. The improvement gains typically range between 30 and 50 percent.
• Investment success is highly predicated by the interest level of angels during the entrepreneur’s initial presentation and by the angels’ subsequent due diligence.
• Access to capital per se may not be the most important value-added that angel groups bring. Some of the “softer” features, such as angels’ mentoring or business contacts, may help new ventures the most.

I came across this post from the excellent blog of David B. Lerner, a guy who describes himself as, “a Serial Entrepreneur, Director of Columbia University Venture Lab/Spin-Offs Program, Angel Investor, and Golfer-in-Exile” but who is, most importantly, someone who tracks this space and has this series on angel investing if you’d like to know more.