Citadel buys NYSE market making business

KCG deal comes as Chinese investors buy Chicago Stock Exchange

Trader Sarao set for extradition battle

Challenge to focus on scapegoat claims and possible sentence

Conceptual digital image of lock on circuit background

Aquis bans ‘predatory’ high-speed trading

UK share venue clamps down on liquidity-draining strategies

High-frequency traders in charge at NYSE

Barclays relinquishes status as designated market maker

Cattlemen lock horns with exchange

Industry group urges crackdown on high-frequency trading

US Treasuries start-up secures funding

Venture capitalists back US debt securities trading venue

US regulators gain more time over IEX

SEC has until March to weigh up move to be registered exchange

French regulator fines Euronext and Virtu

AMF hits exchanges operator and market maker with €5m penalties

Call for algo traders to show source code

US regulator’s proposal alarms ranks of automated trading firms

War of words over IEX goes up a notch

Start-up says planned speed bump still leaves it faster than NYSE

US traders face tougher scrutiny

Effort to curtail market disruptions from automated strategies

Fierce debate over challenger trading venue

IEX plans to neutralise the industry’s arms race in terms of speed

IEX rebuts rivals over bourse plans

Trading venue featured in ‘Flash Boys’ hits back at criticism

Credit Suisse eyes Dublin trading floor

Swiss bank aims to move 100 staff to Ireland

Regulators turn up heat on spoofing

Michael Coscia found guilty of market disruption

Virtu Financial rides volatility wave

US high-frequency trader reports 34% rise in quarterly profit