MarketAxess Holdings Inc. (MKTX) recently acquired a majority stake in RFQ-hub Holdings LLC, a global request-for-quote (RFQ) platform that facilitates trading in ETFs, derivatives, and structured products. The platform supports both listed and over-the-counter (OTC) trades across multiple asset classes. MKTX now holds around a 90% controlling stake in the platform.The remaining ownership stays with original consortium members like Virtu Financial, Inc. (VIRT) , BlackRock, Inc. (BLK) , Citadel Securities, F ...