Optionsellers.com is first known casualty of last week’s price spike

London’s central position means a messy divorce would be complicated and costly 

A fifth of €13bn-a-day sovereign trades could leave London

Long-awaited ‘CAT’ system to track orders and trades launched despite ‘bugs’

Regulators will allow temporary exemptions to prevent disruption to thousands of uncleared derivatives contracts

Market volatility pumps up trading volumes after quiet spell

After a slow start, regulators and exchanges take more action against market abuse

Net income rose more than 40% but came in below expectations

UK interdealer broker reports muted improvement in trading after summer of troubles

Short-term permission reflects Brussels’ fears over financial stability of bloc

FCA consultation comes as task force says leveraged derivatives riskier than cryptoassets

SEC roundtable lays bare dispute over costs of market information feeds

Licence approval for UK’s Setl represents a further coup for proponents

Group has forged pact to acquire additional 15% of clearing house for €438m

EU insists on its right to regulate and says it wants to keep markets open

CFTC escalates dispute over Brussels’ attempt to impose oversight of clearing houses

Rebuke from regulator signals tougher line on bourses and backing for banks