"This extension aims to ensure greater efficiency in the use of public resources, maximising the recovery value of the State's stake and thus responding to the ultimate goal of protecting the general interest," it said in a statement.

This is the fourth extension to the government's self-imposed deadline to sell its stake in the bank, the country's biggest lender by domestic assets.

Caixabank completed its 4.3 billion euro ($5.2 billion) acquisition of state-owned Bankia in March 2021, creating Spain's biggest domestic bank with more than 650 billion euros in assets.

The government bailed out Bankia in a 22.4 billion euro rescue in 2012 at the height of Spain's financial crisis.

With the sale of its stake in Caixabank, Spain seeks to recover the public money used to shore up Bankia's finances at the time.

Last year, Economy Minister Nadia Calviño said the government was "in no hurry" to offload its holding in Caixabank.

($1 = 0.9422 euros)

(Reporting by David Latona; Editing by David Holmes)