William Blair provides investment banking, equity research, institutional and private brokerage, and asset management to individual, institutional, and issuing clients. Its services include portfolio management, sales and trading, investment banking services, mutual funds, and venture capital financing. It also provides private equity investments through its investment arm William Blair Capital Partners. William Blair was established in 1935 and is based in Chicago, Illinois, with additional offices in London, San Francisco, California, Tokyo, Vaduz, and Zurich.