Intrum announced earlier in July that it had entered into a binding agreement with a majority of its bondholders to "significantly improve and strengthen the group's capital structure".
However, according to the Financial Times, bondholders with debts maturing as early as next year have become upset as they had expected a faster repayment.
According to the agreement, existing unsecured bonds will be replaced by new bonds maturing between 2027 and 2030, at 90 percent of their original value. The holders have also been offered 10 percent of the shares in Intrum.
The upset bondholders have now formed a cooperation to oppose the terms of the agreement.
At the same time, Intrum announces that the deadline for signing the agreement has been extended until August 19.
The company's share price plummeted on Tuesday by around 12 percent on the Stockholm Stock Exchange.
