William Blair Growth Fund (WBGSX) is a growth-oriented mutual fund managed by William Blair & Company, L.L.C., that seeks long-term capital appreciation by investing primarily in common stocks of growth companies with market capitalizations generally above $2 billion. The fund offers a no-load share class for retail investors, alongside institutional share classes, and employs a fundamental, bottom-up investment approach focusing on companies demonstrating sustainable competitive advantages, high-quality management, and strong growth prospects across diverse sectors including technology, healthcare, consumer discretionary, and industrials. It provides daily liquidity, professional portfolio management, and risk controls such as position limits and sector diversification guidelines. William Blair Growth N operates within the U.S. mutual fund industry, targeting individual investors, financial advisors, and institutional clients seeking equity growth exposure; the firm maintains a global research presence but the fund focuses predominantly on U.S.-listed securities with select international holdings. Headquartered in Chicago, Illinois, William Blair & Company was founded in 1935 and manages over $200 billion in assets across equity, fixed income, and alternative strategies. Recent developments include the fund's strong performance amid market rallies in 2024-2025, driven by holdings in high-growth tech and healthcare names, alongside William Blair's strategic expansion into private credit and sustainable investing initiatives announced in late 2024.