Shortly after returning to her firm, she ran in the Republican primary for the Senate seat of Daniel Patrick Moynihan. She finished second behind State Assemblywoman Florence Sullivan, who went on to lose to Moynihan in November 1982. In the mid-1990s, Siebert & Co. reverse merged with a furniture holding company, J. Michael & Sons, that was liquidating, thereby, becoming a publicly-traded company. Siebert remained President of her eponymous firm and continued to be a sought after commentator on phenomena in financial markets. She was interviewed in the 2003 documentary "Risk/Reward".