 NEW YORK, June 23, 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 a series of new enhancements for clients using portfolio trading on the MarketAxess platform to better integrate with a full suite of trading solutions. 