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O'Connor & Associates was a Chicago-based options trading firm, with a particular emphasis on financial derivatives. The firm was founded in 1977 by Edmund J O'Connor and his brother William O`Connor. In 1992, O'Connor & Associates was acquired by Swiss Bank Corporation. [1]
[141] [142] In 2013, Yelp sued a lawyer it alleged was part of a group of law firms that exchanged Yelp reviews, saying that many of the firm's reviews originated from their own office. The lawyer said Yelp was trying to get revenge for his legal disputes and activism against Yelp. [ 134 ]
Global Trading Systems, which uses the trade name GTS, is an American proprietary trading and market making firm headquartered in New York. The firm accounts for 3 to 5 percent of the daily turnover of US equities and has handled over 250 IPO listings since 2013. GTS has additional offices in Chicago, Florida, London, Paris, Warsaw, and Israel.
Jump Trading LLC is a proprietary trading firm with a focus on algorithmic and high-frequency trading strategies. The firm has over 700 employees in Chicago, New York, Austin, London, Tel Aviv, Singapore, Shanghai, Bristol, Gurgaon, Gandhinagar, Sydney, Amsterdam, Hong Kong, and Paris and is active in futures, options, cryptocurrency, and equities markets worldwide.
Mark Andrew Ritchie is a Chicago Board of Trade and Chicago Mercantile Exchange commodities trader.A twenty-year veteran of the financial industry, Mark is one of the original founding partners of Chicago Research and Trading (CRT) (the other, his brother Joe Ritchie) which was once the largest options firm in the industry.
Susquehanna International Group, LLP (SIG) is a privately held, global trading and technology firm.SIG comprises a number of affiliated entities specializing in trading and proprietary investments in equities, fixed income, energy, commodity, index and derivative products, private equity and venture capital, research, customer trading and institutional sales.
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Radix Trading was co-founded by Benjamin Blander and Michael Rauchman. Blander was previously head of the high-frequency trading group of Citadel LLC while Rauchman was the chief technology officer of GETCO. [1] [2] [3] In August 2017, Radix Trading opened an office in Amsterdam to expand its operations into Europe.