"The big question is what they will do with that cash, " said Kaupthing Bank analyst Christian Hellman.
Iceland got in financial difficulties after it took over its three biggest banks: Landsbanki, Kaupthing and Glitnir.
Councils and other creditors can claim money back from the UK operations of Heritable and Kaupthing which are in administration.
The Swedish central bank said it believed that Kaupthing was solvent, but was suffering temporary liquidity problems that could have wider repercussions.
The Icelandic stock exchange had been shut down since Thursday, and trading of six financial stocks, including Kaupthing, Landsbanki, Glitnir and Straumur-Burdaras, remained suspended.
Each of the three failed Iceland banks Kaupthing, Landsbanki and Glitnir had loaned large sums to their biggest shareholders on favorable terms.
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Nowhere is the situation more dire than in Iceland, where the assets of the country's largest bank, Kaupthing Bank, are six times the country's GDP.
The British authorities pressed Landsbanki to create a subsidiary in London that would be supervised by British banking authorities, as its compatriot, Kaupthing, had done.
The High Court heard that tens of millions of pounds was held in the UK and frozen by the government during the crisis that engulfed KSFIOM's Icelandic parent bank, Kaupthing.
"To safeguard financial stability in Sweden and ensure the smooth functioning of the financial markets, the Riksbank has therefore decided to grant liquidity assistance to Kaupthing Sverige, " it said in a statement.
The court has previously heard that tens of millions of pounds was held in the UK and frozen by the UK government during the crisis that engulfed its Icelandic parent bank, Kaupthing.
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