MADRID (Reuters) - Spanish banks Bankia (>> Bankia SA) and Caixabank (>> CaixaBank SA) on Thursday announced stake sales in other companies as lenders bulk up capital ahead of Europe-wide health checks of their balance sheets this year.

Bankia and its parent company BFA said they had put all of their 12.6 percent stake in the hotel group NH Hoteles (>> NH Hoteles SA) up for sale. The stake is worth around 192 million euros (159 million pounds) at Thursday's closing price.

Caixabank said it had sold its 5 percent stake in the stock market operator BME (>> Bolsas Y Mercados Espaneoles Socdad Hldg) to institutional investors at 29.6 euros per share, netting capital gains of 47 million euros for the bank.

This was slightly below BME's Thursday closing price of 30.75 euros.

Spain's bailed-out banks, such as Bankia, have been among the most active sellers of industrial holdings as they slim down as part of their restructuring plans.

Bankia has already sold stakes in IT company Indra (>> Indra Sistemas SA), International Airlines Group (>> International Consolidated Airlines Grp) and insurance group Mapfre (>> Mapfre SA). It still has to sell 5.14 percent of utility Iberdrola

 (>> Iberdrola SA).

At the end of 2012, La Caixa, Caixabank's parent group, raised 1.65 billion euros by cutting its majority stake in Caixabank. It also raised funds though a bond that could be exchanged into part of its stake in Spanish oil major Repsol

 (>> Repsol SA).

JB Capital Markets will act as book-runner for the Bankia operation, while Citigroup sold Caixabank's stake in BME.

($1 = 0.7352 euros)

(Reporting by Sonya Dowsett; Editing by Julien Toyer, Anthony Barker and Kevin Liffey)