Siebert Financial Corp. is a brokerage and financial advisory services firm founded in 1967 by Muriel Siebert, the first woman to own a seat on the New York Stock Exchange. Headquartered in New York City, the company provides a range of financial services, including investment options, brokerage accounts, and financial advice tailored to individual needs. Siebert Financial Corp. operates through subsidiaries such as Muriel Siebert & Co., LLC and Siebert AdvisorNXT, LLC.