The challenger bank was forced to raise £375mln last week to bolster its balance sheet after a major accounting error earlier in the year left it undercapitalised.
It offered shares to investors at a steep discount to the prevailing price, and Norges Bank, which manages Norway’s wealth fund, was one of those which took part.
The fund now has a 3.1% stake in Metro Bank, worth just over £20mln.
The purchase of shares in Sirius and Metro comes as the sovereign wealth fund pivots away from its historic focus on oil.
Originally formed as Norway’s ‘oil fund’ with the piles of cash generated by the country’s vast petroleum reserves, the Government Pension Fund Global, as it is officially known, has been told by the Norwegian government to focus less on oil and gas firms.
Metro Bank shares were up 3.2% to 677p on Tuesday.