Los fondos buitre are entities specialised in buying portfolios of unpaid debts from banks and finance companies. The price they pay is very low — between 1 y 10 céntimos por cada euro of the nominal debt. They buy thousands of loans in bulk and then try to collect the full amount from the debtor, generating a very high margin.
The main ones in Spain are Cabot Financial, Intrum (antigua Lindorff), EOS Group, Hoist Finance, Axactor, B2K Capital, Encore Capital, Krukand others. They mainly operate on unpaid revolving credit cards, consumer loans and payday loans. Their model is based on pressure: repeated calls, letters, inclusion in defaulter registries and, finally, payment-order proceedings.
What the fund does not want you to know: in many cases they cannot legally prove the full assignment of the debt. Documents are missing, they did not notify you of the assignment correctly, the original debt may be time-barred or usurious, or the fund has not complied with its procedural duties. A well-prepared defence cancels the debt in a very high percentage of cases.