Mr Muhtaseb has already successfully completed six operations at Swansea.

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The new GM commenced operations on July 10, 2009 after it completed the acquisition of substantially all of the assets and assumed certain liabilities of the old GM through a 363 Sale under the Bankruptcy Code.

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Once completed, the system will be able to perform 10 quadrillion operations per second, making it one of the fastest computers on the planet.

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The transaction will be completed this month, but Swiss Re's U.K. operations will stay in the building as a tenant until 2031, holding 50% of the office space.

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Alleghany just completed a merger with Transatlantic Holdings on March 6, so its first-quarter results include 25 days of operations with Transatlantic.

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