The National Treasury Management Agency has bought a further €500m of treasury bonds from the Central Bank, which are to be cancelled.
This brings to €3 billion the amount of bonds bought by the NTMA for disposal in 2016.
As part of a 2013 deal struck with the European Central Bank to stretch out the cost of liquidating the collapsed Anglo Irish Bank, the NTMA said it would slowly feed new bonds worth €25 billion into the market via the Central Bank.
They were issued in connection with the Irish Bank Resolution Corporation (IBRC), which was liquidated in February 2013.