Robo-advisor performance rebounded along with global equity markets in this year's third quarter, but some automated digital investing platforms fared better than others.

According to the recent Robo Report from Martinsville, N.J.-based Backend Benchmarking, approximately 8% of U.S. households invest via robo-advisors. Currently, 13% of Schwab’s clients hold assets in robo-advisor accounts, as do 10% of clients at Fidelity and Vanguard.

The Robo Report studied annualized returns for robo-advisors in a taxable account. During the three years ending Sept. 30, the average 60/40 robo-advisor portfolio returned 5.6% annually compared to 12.3% for the Russell 1000 large-cap index and 5.2% for the Bloomberg-Barclays U.S. Aggregate Bond Index. By comparison, Vanguard’s 60/40 Composite, which it uses to benchmark 529 plans, returned 8.6% annually during the same period.

A newer robo-advisor focused on active-like strategies, Titan Invest, outperformed its peers on a shorter-term basis. However, Titan has not existed long enough to have track record of more than one year.

In the third quarter, Backend Benchmarking found that robo-advisor accounts using socially responsible and ESG investing options tended to outperform their peers. But most of these strategies haven't been around long enough to build three-year track records.

For its quarterly Robo Report, Backend Benchmarking tracks 88 robo-advisor accounts across 41 different digital advice providers. While the report looks at returns going back four years, only 11 current robo-advisors have results going back that far.

Instead, the following list, presented in ascending order, comprisies the Robo Report’s top ten robo-advisors by three-year returns through this year's third quarter:

10. Ally Financial 5.37%

Ally had around $277 million AUM within nearly 33.000 client accounts. Ally’s robo-advisor service returned 0.72% in 2020 as of Sept. 30.