NEW YORK —
The cause was complications of cancer, said Jane H. Macon, a friend and board member of Ms. Siebert’s firm, the Siebert Financial Corp.
Ms. Siebert, known to all as Mickie, cultivated the same brash attitude that characterized Wall Street’s most successful men. She bought her seat on the exchange in 1967, but to her immense anger, she remained the only woman admitted to membership for almost a decade.
She was one of the pioneers in the discount brokerage field, as she transformed Muriel Siebert & Co. (now a subsidiary of Siebert Financial) into a discount brokerage in 1975, on the first day that Big Board members were allowed to negotiate commissions.
She also was the first woman to be superintendent of banking for New York State, appointed by Governor Hugh Carey in 1977. She served five years during a rocky time when banks were tottering and interest rates were skyrocketing.
Ms. Siebert was known, to her delight, as a scrapper who refused to acknowledge defeat. She donated millions of dollars from her brokerage and securities underwriting business to help other women get their start in business and finance.
When she was honored for her efforts in 1992, Ms. Siebert used the luncheon celebration to warn that it was still too soon for women to declare victory in the battle for equality on Wall Street.
“Firms are doing what they have to do, legally,” she said. “But women are coming into Wall Street in large numbers — and they still are not making partner and are not getting into the positions that lead to the executive suites. There’s still an old-boy network. You just have to keep fighting.”
She continued fighting the old-boy network all her life. She was one of the first women, in the early 1970s, to fight to end the sexist practices then prevalent in Manhattan social clubs, spurred by an experience she had at the Union League Club. She had arrived there for a board luncheon meeting of the Sales Executive Club and was not allowed in the elevator.
“I had to go through the kitchen and walk up the back stairs,” she recalled.
She was so angry during the meeting that her male colleagues asked what was wrong. When the lunch was finished, they tried to take her down in the elevator with them. When she was again rebuffed, they joined her in walking down the stairs and through the kitchen.
That experience, and other similar episodes, led her to testify before government bodies about the discriminatory policies of many New York clubs. In time, women were permitted to become members. This was particularly important because of the deal-making and networking done at such clubs.
Ms. Siebert was born in Cleveland on Sept. 12, 1928, the second of two daughters of Irwin Siebert, a dentist, and his wife, Margaret. She attended Western Reserve University for two years but left in 1952 before graduating because her father became ill.
She came to New York in 1954, she once said, “with $500, a Studebaker, and a dream.” She was hired as a $65-a-week trainee in the research department at Bache & Co.
“The way it worked, everybody who was already there got to give the new kid one of their junk industries,” she told The New York Times in 1992. “I got airlines, I got motion pictures — things nobody wanted in those days.”
She changed jobs three times because she said men doing the same work were being paid more than she was. She also discovered when job hunting that when the New York Society of Security Analysts sent out her resume under the name Muriel Siebert, she received no inquiries, but when the society later distributed it under the name M.F. Siebert, the results were quite different.
She eventually decided to strike out on her own and become the first woman to purchase a seat on the NYSE. She was turned down by the first nine men she asked to sponsor her application before a 10th agreed.
The exchange told her that if she was admitted, her seat would cost $445,000, and in an unprecedented move, the exchange insisted that she get a bank to lend her $300,000 of the total price. The banks, in turn, refused to lend her the money unless the exchange admitted her.
“There would be no loan until I was accepted, and I couldn’t be accepted without the loan,” she said.
After nearly two years she got the loan, from Chase Manhattan, and she was elected to the NYSE on Dec. 28, 1967. It proved to be a historic day, but one that was not soon repeated.
“For 10 years,” she said, “it was 1,365 men and me.”
She continued to encounter resistance, and not only because she was a woman. Ms. Siebert also encountered anti-Semitism, which at the time, she said, was not uncommon in the trust departments she dealt with.
In 1969, she founded Muriel Siebert & Co., becoming the first woman to own and operate a brokerage firm that was a member of the NYSE. On May 1, 1975, after the federal government did away with fixed commissions for brokers, Siebert declared her company a discount brokerage firm.
Two years later she put her company in a blind trust and accepted Carey’s appointment as state superintendent of banking. Her five-year term was controversial, as she took the lead in engineering mergers and acquisitions. But in the end she liked to say that no New York bank failed during her tenure.
Ms. Siebert, who never married or had children, leaves a sister, Elaine.
Often sought out for quotes as a market pundit and occasional critic of Wall Street practices, Ms. Siebert produced an autobiography in 2002, “Changing the Rules: Adventures of a Wall Street Maverick.”
In 2007, she celebrated the 40th anniversary of buying a seat on the NYSE by ringing the closing bell.
Ms. Siebert often appeared in public with Monster Girl, her long-haired Chihuahua, and a successor, Monster Girl 2. She claimed affinities with Monster Girl, noting that they were “not intimidated by the big dogs.”
Correction: Because of incorrect information provided to The New York Times, the age and date of birth of Wall Street trailblazer Muriel Siebert were incorrect in an obituary in Monday’s Globe. Ms. Siebert, who died Saturday, was 84, not 80, and she was born Sept. 12, 1928, not Sept. 12, 1932.