NEW YORK, Jan. 05, 2021 (GLOBE NEWSWIRE) -- MarketAxess Holdings Inc. (Nasdaq: MKTX), the operator of a leading electronic trading platform for fixed-income securities, and the provider of market data and post-trade services for the global fixed-income markets, today announced monthly trading volume for December 2020 of $472.3 billion consisting of $203.5 billion in credit volume and $268.7 billion in rates volume.