Defeating the odds since 1967. Siebert is a brokerage and wealth management firm with a history of Indomitability and Fearlessness. It started with the inspiring story of our founder, Muriel Siebert. Despite the odds, she battled her way to become the first woman to own a seat on the New York Stock Exchange. Today, Siebert is stronger than ever, and Muriel’s legacy lives on in our commitment to our clients: Financial Freedom for Everyone. Subsidiaries include Muriel Siebert & Co., LLC., Park Wilshire Companies, Siebert AdvisorNXT