Shares in Dunkin’ Brands, the owner of the Dunkin’ Donuts brand, increased as much as 56% on their first day of trading on Wall Street yesterday, finally closing at $27.85, valuing the group at over $3.5bn (£2.14bn). It is thought that Dunkin' Brands plans to use the proceeds from the IPO to repay debt and for working capital. The company, which was taken private in 2005 in a $2.4 billion deal, plans to open more than 250 Dunkin’ Donuts sites over the next two years. The group, which currently operates c.9,800 sites worldwide, said it believed it had the potential to eventually reach a total of 15,000 units in the US alone. It currently doesn’t have a presence in the UK.