American Century Select Fund Investor Class (TWCIX) is an open-end mutual fund offered by American Century Investments, focusing on long-term capital growth through investments primarily in common stocks of mid- to large-capitalization companies selected for their growth potential. The fund employs a growth-oriented investment strategy, allocating assets across sectors such as technology, healthcare, consumer discretionary, and industrials; it maintains a diversified portfolio typically comprising 40 to 80 holdings, with key positions in established growth names like Apple Inc., Microsoft Corp., and NVIDIA Corp., alongside selective exposure to emerging leaders. Services include investor class shares with a minimum initial investment of $2,500, automatic dividend reinvestment options, and access through retirement plans, brokerage platforms, and financial advisors targeting individual and institutional investors seeking equity growth. American Century Investments, the fund's sponsor, was founded in 1958 and is headquartered in Kansas City, Missouri, with operations extending across the United States and select international markets through affiliated entities. In recent developments, the fund underwent a portfolio manager transition in 2024, with Michael Schmelzer assuming lead responsibility alongside co-managers to enhance focus on high-quality growth stocks amid market volatility; additionally, American Century announced strategic expansions in sustainable investing overlays and ETF launches in 2025, indirectly bolstering the fund's ecosystem through shared research capabilities and lower-cost share classes.