Qatar Investment Authority, the state sovereign wealth fund which owns Qatar Holding, did not respond to a request for comment. The share sale comes as Barclays embarks on a shake-up to cut costs and revive its share price, which has halved since Qatar first invested in 2008. Barclays' stock fell as much as 4.5% in early trading and was last down 2.5% at 1007 GMT. Qatar became Barclays' largest shareholder during the 2008 financial crisis when it injected 4 billion pounds into the UK bank in a deal that helped avert a taxpayer bailout. Britain's financial watchdog later fined Barclays $55 million for fees paid to Qatari entities in the 2008 fundraising, which Barclays said it would appeal.

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Persons: Venkatakrishnan, Vekatakrishnan, Iain Withers, Sinead Cruise, Pablo Mayo Cerqueiro, Lawrence White, Danilo Masoni, Andrew Mills, Kirsten Donovan, Emelia Organizations: Barclays, Qatar, Reuters, Qatar Investment Authority, Qatar Holding, Thomson Locations: Qatar, Germany, London, Milan, Doha