Oppenheimer Holdings Inc. operates as a middle-market investment bank and full-service broker-dealer. It provides brokerage services covering corporate equity and debt securities, money market instruments, exchange-traded options, municipal bonds, mutual funds, exchange-traded funds, certain precious metals, and unit investment trusts; financial and wealth planning services; and margin lending services. The company also offers asset management services, including separately managed accounts, mutual fund managed accounts, discretionary portfolio management programs, non-discretionary investment advisory and consultation services, alternative investments, portfolio enhancement programs, and institutional taxable fixed income portfolio management strategies and solutions, as well as taxable and non-taxable fixed income portfolios and strategies. In addition, it provides investment banking services, such as strategic advisory services and capital markets products; merger and acquisition, equities capital market, debt capital market, debt advisory and restructuring, and fund placement services; and institutional equity sales and trading, equity research, equity derivatives and index options, convertible bonds, event driven sales and trading, and portfolio and electronic trading, as well as provides custody, clearing, and prime services. Further, the company offers institutional fixed income sales and trading, fixed income research, public finance, and municipal trading services; and proprietary trading and investment activities. Additionally, it provides underwriting, market-making, trust, and discount services, as well as a cloud-based financial market. The company serves high-net-worth individuals and families, corporate executives, public and private businesses, institutions and corporations, governments, financial sponsors, and domestic and international investors. The company was founded in 1881 and is headquartered in New York, New York.