Best Fidelity Index Funds 2024 Morningstar. The fidelity zero large cap index (fnilx) is one of the best index funds tracking the s&p 500. These mutual funds offer investors the chance to diverse their portfolio while keeping the process efficient.

While the latter still dominates, fidelity has accumulated $1.3 trillion in index fund assets, an impressive feat for a company that once symbolized active management. The zero expense ratio makes this fund among the most affordable.