The Norwegian central bank says the country's vast oil fund achieved a 7.2 percent return on investments in the third quarter, following gains in global stock and bond markets.
The increase corresponds to 199 billion kroner ($34 billion), and lifts the total market value of the fund to 2.9 trillion kroner ($500 billion).
Norges Bank Thursday said all sectors gained during the quarter, but investments were improved particularly by strong earnings from financial, industrial and basic materials companies.
Better-than-expected growth in Chinese industrial production in August and September also contributed to the global upswing in stock markets, it said.
Oil-rich Norway invests surplus oil revenue abroad to avoid overheating its domestic economy.