The iShares Russell 1000 Large-Cap Index Fund - Class A (BRGAX) is a mutual fund that seeks to track the performance of the Russell 1000 Index, which includes the largest 1000 companies in the US stock market. This fund is classified as a large-cap fund, meaning it primarily invests in large, established companies with a market capitalization of over $10 billion. As a Class A fund, it may have lower fees and expenses compared to other share classes of the same fund. Investors in this fund can expect to have a diversified portfolio of large-cap stocks, providing potential for long-term growth and stability.