Banco Santander, a global banking giant headquartered in Spain, has announced an agreement to acquire 100% of TSB Banking Group plc (TSB), a UK-based retail bank, from Banco de Sabadell, S.A. (Sabadell), a Spanish financial services group.
The transaction is valued at £2.65bn (approximately €3.1bn) and will be executed as an all-cash deal.
The acquisition is aimed at significantly enhancing Santander’s market presence in the UK, one of its core geographies. With the integration of TSB, Santander UK will become the third-largest bank by personal current account balances and fourth in the mortgage market. The combined entity will serve nearly 28 million customers across retail and business banking segments. TSB’s clients will also gain access to Santander’s extensive international network and advanced technology infrastructure.
TSB is a longstanding UK retail bank with a national network of 218 branches and a growing digital footprint. It serves around 5 million customers, primarily in personal and small business banking, managing £34bn in mortgages and £35bn in deposits. Santander, already a key player in the UK market, aims to leverage this acquisition to strengthen its lending and deposit-taking capabilities, while achieving greater operational efficiency.
The strategic rationale for the acquisition lies in unlocking shareholder value through increased in-market scale, access to low-risk mortgage assets, and high-quality deposit bases. The combined business is projected to have a loan-to-deposit ratio of 107%. Santander estimates the transaction will deliver a return on invested capital of over 20% and improve return on tangible equity from 11% in 2024 to 16% by 2028.
Cost synergies are expected to reach 13% of the merged entity’s cost base—equating to at least £400m pre-tax—while restructuring costs are projected at £520m across 2026 and 2027. The deal will be accretive to earnings per share from the first year, contributing roughly 4% by 2028. Despite consuming about 50 basis points of CET1 capital, Santander’s pro forma CET1 ratio is expected to remain near 13% at year-end 2025.
The deal aligns with Santander’s disciplined capital strategy and does not alter its 2025 financial objectives or distribution policy. Santander’s track record in integrating UK financial institutions, including Abbey (2004), Alliance & Leicester and Bradford & Bingley (both in 2008), strengthens confidence in the seamless execution of this acquisition. Leveraging joint technology platforms is expected to streamline operations and support long-term profitability.
TSB customers will benefit from enhanced digital services, a broader product suite, and access to international banking. Santander aims to maintain high service standards while accelerating its UK transformation journey.
Commenting on the transaction, Banco Santander executive chair Ana Botín said, “The acquisition of TSB represents a continuing strategic commitment to our customers in the UK, offering a compelling opportunity that is financially attractive to our shareholders and aligned with Santander’s long-term objectives. It strengthens our franchise in a core market through the acquisition of a low-risk and complementary business that adds to our diversification.
We are creating a stronger and more competitive business across key products such as personal current accounts where the combined business will become the third largest bank in the UK by market share.
The transaction will accelerate our path to greater profitability in the UK and helps achieve a return on tangible equity of 16% by 2028.
The acquisition also reflects our commitment to growing profitably through disciplined capital allocation. This acquisition meets our goal of achieving a return on investment above 20% and EPS accretion from year 1, while consuming limited capital and having low execution risk.
Furthermore, the transaction will not affect Santander’s existing distribution policy and 2025 targets.”
Santander UK CEO Mike Regnier said: “This is an excellent deal for customers combining two strong and complementary banks, creating one of the most substantial banks in the UK and materially enhancing the competitiveness of the industry.
At Santander UK we have momentum in our strategy to become the best bank for customers in the UK by investing in technology and service and improving our processes and efficiency. This deal accelerates our transformation allowing us to enhance our customer proposition and invest more in innovative products and our digital offering, supported by the human touch service so many appreciate, not least in our new branch formats and enhancements across the country.
We are fully committed to ensuring a seamless integration, by leveraging our market leading technology and significant experience. Maintaining the highest levels of service for customers across both banks will be a key priority and we will support all colleagues through the transition, as we invest in building a stronger bank for the future”.
The acquisition remains subject to regulatory and Sabadell shareholder approvals.
Keep up with all the latest FinTech news here
Copyright © 2025 FinTech Global
