U.S. market-making firms Citadel Securities and Jane Street Group LLC are expected to set record annual revenues. According to insiders, Citadel Securities' net trading income in the first half of the year increased by 81% compared to the same period last year, reaching $4.9 billion; Jane Street's grew by 78%, reaching $8.4 billion, both far exceeding the pace needed to set a new historical high for annual revenue.