By David Wighton in London and Christopher Bjork in Madrid 

Spain's Banco de Sabadell SA agreed a GBP1.7 billion ($2.5 billion) takeover of TSB Banking Group PLC that could lead to further consolidation among smaller "challenger" banks in the U.K.

Josep Oliu Creus, Sabadell's chairman, said "it would be natural to see some consolidation" in due course although he told a news conference in London that the Spanish lender wasn't looking for further opportunities now.

The bank's chief executive, Jaime Guardiola, told reporters in Barcelona on Friday: "Evidently there could be room to do transactions, from the position of challenger. I believe we will be in a condition to grow."

Sabadell's acquisition of TSB has been privately welcomed by the British government which is eager to see increased competition in banking and has encouraged the growth of new challenger banks.

One senior official said the government was enthusiastic about the deal which it hopes will lead to consolidation. "There is a question of whether these banks are big enough on their own to challenge the market leaders. They may need greater scale to have a significant impact on competition," said the official. TSB has 4% of checking accounts and 6% of U.K. bank branches.

The official pointed to the example of Sabadell's bigger Spanish rival, Banco Santander SA, which has become a major force in U.K. banking after building on its acquisition of Abbey National in 2004. It made further purchases of banks hit by the financial crisis and is now the second largest mortgage lender in the U.K. In total size it ranks behind the big four of Lloyds Banking Group PLC, Royal Bank of Scotland Group PLC, Barclays PLC and HSBC Holdings PLC.

The U.K. has seen the emergence of a number of smaller banks since the financial crisis. These include Virgin Money Holdings PLC and Aldermore Group PLC, both of which recently went public, and Shawbrook Group Ltd, which has just announced plans for an initial public offering. Adding to the list soon will be Williams & Glyn, which is being spun out of RBS, and Yorkshire and Clydesdale banks, which are being prepared for an initial public offering by their owner, National Australia Bank Ltd.

Sabadell, Spain's firth-largest lender, has been an active consolidator during the Spanish banking crisis, buying several struggling lenders at deep discounts. But it has made few moves outside its home market. Sabadell said the acquisition of TSB will increase its assets outside Spain from 5% to 22% of the total.

Mr. Oliu said that Santander's success was an important factor behind Sabadell's decision to enter the U.K. which was an attractive banking market with margins similar to those in Spain and higher than in other eurozone countries.

"TSB has enormous potential in the U.K. market. It is a challenger and backed by us makes it even more of a challenger," he said. Sabadell would be able to accelerate TSB's entry into the small business banking market, he added.

TSB said it had agreed the terms, first revealed a week ago, of a takeover at 340p a share. To maintain its key capital ratio, a measure of financial strength, following the deal Sabadell said it would raise E1.6 billion ($1.7 billion) in a rights issue. Lloyds, which floated a minority stake in TSB at 260p a share last June, said it would sell a 9.99% stake in TSB to Sabadell and has agreed to accept the offer for its remaining 40% shareholding.

Sabadell plans to move TSB to its own Proteo IT platform and predicted there would be annual pretax savings of GBP160 million in the third full year after completion. Lloyds, which currently provides IT services to TSB, is already committed to paying GBP450 million to help migrate TSB to a new platform.

Sabadell's shares rose 3% after Friday's confirmation of the deal but were still 8% below where they were trading before the announcement of the talks.

Following the takeover, Paul Pester, TSB's chief executive, and Darren Pope, its chief financial officer, have agreed to stay in the roles subject to agreeing personal terms. Mr. Pester will join Sabadell's management executive committee. Will Samuel will remain as TSB's independent chairman.

Write to Ian Walker at ian.walker@wsj.com

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