Best Index Funds To Buy Now May 2026

For investors looking to build a portfolio in , index funds remain a cornerstone for long-term growth due to their low costs and broad diversification. Market analysts currently project near double-digit returns for the S&P 500 in 2026, with some targets reaching 7,500 . Core S&P 500 Index Funds (U.S. Large-Cap)

: Currently offers one of the lowest expense ratios in the industry at 0.015% with no minimum investment.

The Best Index Funds and How to Start Investing - NerdWallet best index funds to buy now

: A unique 0.00% expense ratio fund available specifically to Fidelity customers in certain fee-based accounts. Total Market and Small-Cap Funds

: A favorite for long-term holders with a 0.03% expense ratio; it is managed by the firm that pioneered index investing. For investors looking to build a portfolio in

These funds track the 500 largest U.S. companies and are widely considered the "gold standard" for foundational portfolios.

For investors seeking exposure beyond just the largest 500 companies, these funds include thousands of small and mid-sized businesses. Large-Cap) : Currently offers one of the lowest

: A highly accessible choice with a 0.02% expense ratio and a $0 minimum investment.