The iconic skyscraper, at 30 St Mary Axe, is known as the Gherkin because of its distinctive shape.
According to the Financial Times, the group - headed by billionaire Brazilian businessman Joseph Safra - paid £726m for the 180m high Norman Foster-designed tower.
The building was put up for sale earlier this year with a guide price of £650m.
The Gherkin is the second tallest tower in the City of London and the sixth tallest in London.
Lloyd Scott has completed his charity climb up the Gherkin in a deep diving suit in a total time of 2 hours and 53 minutes.
He climbed 38 floors and a total of 1,037 steps in the 10 stone suit - and told ITV London how he felt at the top.
Lloyd Scott MBE, from Rainham, was originally best known as a professional footballer. But since 1989 he has been devoting his time to all manner of weird and wonderful charity challenges - some of the strangest of which are below.
November 1993: Everest Marathon – Staged 18,000 feet up the world’s highest peak
July 1998: Completed 135 mile Death Valley ultra marathon in 140 degrees of heat
October 2003: Completed the world’s first underwater marathon in deep-sea diving suit in Loch Ness – taking 12 days
Oct-Dec 2004: Cycled Penny Farthing across Australia – Perth to Sydney nearly 3,000 miles taking 50 days
May 2005: ‘Swam’ from John O’Groats to Land’s End in swimming pool on back of a lorry, taking 12 days
June 2010: World's deepest underground marathon, 12,000 feet down a mine in South Africa
During his climb up the Gherkin today, Lloyd Scott MBE is wearing at 1940s diving suit that weighs 140lbs, or 10 stone.
The antique suit, complete with solid copper helmet, means that the cumulative weight Lloyd will lift during his climb is 66 metric tons.
It's not the first time Lloyd has been seen in one of these suits however. He's completed a number of marathons in one, including the London Marathon in 2002 when he broke the record for the slowest time, taking almost six days to complete it.
He was also the first person to complete the 2012 Olympic Marathon Route, again wearing one of the suits. He was barred from competing in the actual race as it was ruled that competitors have to finish on the same day the race starts.
A charity fundraiser is set to climb all 1,037 steps inside the Gherkin whilst wearing a 1940s deep diving suit today to raise money for charity.
Lloyd Scott MBE will wear the 140lbs suit as he climbs all 38 of the Gherkin's floors as part of his own Britain's Personal Best challenge later this morning.