IEX takes exception to Nasdaq's planned new data offering.
US regulators have given a six-month reprieve from new margin rules.
Institutional demand for efficient trading in size XL is as strong as ever.
Connectivity provider offers the lowest latency between Toronto and New York.
FX and ETFs are seen as especially data-hungry areas.
CSX board member says Chinese firm's purchase of Chicago exchange will benefit U.S. equity market structure.
Equichain to pilot end-to-end execution to custody blockchain.
Traders stand pat ahead of inflation data and rising PE ratios.
Networks need to communicate and operate with each other for widespread adoption.