Wealthfront publishes its annual returns on its website, showing the historical average returns since 2013. The average return since 2013 is 6.84% per year, while the S&P 500 average over that time frame was 12.90%. But the recent one-year return is 2.15% vs the S&P 500 return of -7.15%. This return reflects some of the conservative nature of a diversified portfolio vs. going 100% in on the stock market.