Some profitable Fidelity index funds include the Fidelity Spartan 500 Index Fund and Fidelity International Enhanced Index Fund. These index funds are said to be two of the best Fidelity mutual funds for retirement, notes InvestorPlace.com.
The Spartan 500, which is publicly traded as FUSEX, is a low-cost index fund with above average returns, according to a snapshot by Morningstar. As of 2015, the fund has returned 6.73 percent over the past decade and 13.24 percent over the last five years, states Fidelity.com.
The Fidelity Spartan Short Term Trust Bond Index Fund is a top-rated fund in the short-term federal funds category with a number five ranking as of 2015. This fund earned a four out of five rating from Lipper Leaders in terms of total returns and an eight out of 10 mutual fund score from U.S. News & World Report.