Franklin Templeton Investments' Michael Hasenstab has defended his Hungarian debt position amid reports the group owns 10% of the country's local bond market.
Developed economies will see $7.6trn worth of debt mature this year, with Italy towards the front of the refinancing queue at a time when its borrowing costs remain elevated.
Around 10% of Hungary's local bond market is owned by Franklin Templeton Investments, according to reports.
George Soros' fund has purchased around $2bn of European government bonds previously held by collapsed brokerage MF Global, according to reports.
Key eurozone sovereign debt yields have fallen sharply after successful debt auctions and comments from ECB president Mario Draghi boosted investor confidence.
Eurozone leaders need to act within the next few days or it will be "game over" for the euro, warned Kames Capital's Phil Milburn.
Yields on short-dated Greek debt have hit a fresh eurozone-era high after the country announced a pause in bailout talks with the IMF.
The delay in the US government's efforts to raise its debt ceiling now means it holds less cash on its balance sheet than tech giant Apple.
The US Congress moved one step closer to sealing a deal on its debt ceiling, pushing down yields on 30-year government bonds.