Sudden swings in HSBC and Diageo shares spark concern, raise questions about exchange stability in computer age.

Bank will pay $1.9 bln and enter a deferred prosecution agreement with U.S. Justice Department.

Bank will pay $1.9 bln and enter a deferred prosecution agreement with U.S. Justice Department.

Bank says Chris Lucas is among employees being investigated for capital-raising fee disclosures.

Bank says Chris Lucas is among employees being investigated for capital-raising fee disclosures.

Bank apologizes to investors for failings on compliance.

Bank apologizes to investors for failings on compliance.

Former Barclays CEO blames competitors and says regulators failed to act promptly.