FSTSX is a mutual fund offered by Fidelity Investments that focuses on investing in small-cap international companies. This fund seeks to provide long-term capital growth by investing in companies with market capitalizations below $5 billion in developed and emerging markets outside of the United States. With a diverse portfolio of small-cap stocks, FSTSX offers investors exposure to international markets and the potential for higher returns. This fund is suitable for investors seeking growth opportunities and diversification in their portfolio.