Hogan Lovells and Allen & Overy (A&O) have emerged as two of the biggest beneficiaries of legal spend by Ireland's National Asset Management Agency (NAMA) since it was set up to address the crisis in the country's banking system in December 2009.

The two firms have collected more than €5m in fees between them since the start of 2010 – with Hogan Lovells earning €2.9m (£2.5m) and A&O €2.5m (£2.1m) – around a fifth of the body's €27.6m (£23.1m) total legal spend over the period.

The fees, which were revealed after Sinn Fein leader Gerry Adams requested a breakdown of the top 10 recipients of legal fees in a parliamentary question, make them the second and third largest earners from NAMA behind Dublin's Arthur Cox, which has earned €3.07m (£2.6m).

Many of the firms benefiting from NAMA's spend are Irish, including Matheson Ormsby Prentice, William Fry and A&L Goodbody. Other firms taking in significant fees include offshore player Maples and Calder, while Simmons & Simmons, SNR Denton, Taylor Wessing and DLA Piper have made relatively small amounts of fees so far in 2012.

According to NAMA it has recovered more than a third of the total fees paid out (€10.1m) from a number of financial institutions from which it has purchased loans.

Adams lashed out at the fees, stating: "These same institutions benefitted during the boom which caused the crisis and are now benefitting from the crisis itself. These contracts need to be the result of a fully open and transparent tendering process."

Legal Week reported in October that Hogan Lovells, which was appointed to NAMA's inaugural legal panel in 2010, advised the body on the sale of £660m in debt it held on hotels including Claridges to the Barclay brothers.

The deal, the largest sale completed by that point by NAMA, saw a vehicle owned by the Barclay brothers buy £660m debt of Maybourne Hotels Group – parent company of Claridges, The Berkeley and The Connaught – from NAMA.

NAMA was set up to manage loans held by banks including Anglo Irish Bank and Bank of Ireland after the financial crisis.