Santander: How a Spanish Bank Built 180 Million Customers

Santander is the answer to a question European banking has never otherwise solved: how do you build scale when the continent’s banking market refuses to integrate? Its answer was to go elsewhere — Latin America, the United Kingdom, the United States, consumer finance across Europe — and to run those markets as a federation rather than a merger. This case study explains the model, the numbers and the vulnerabilities. It is part of the Spain Company Stories hub.

How did a Spanish bank become globally diversified?

By buying when others could not. Santander’s expansion was built through a sequence of acquisitions across Latin America in the 1990s and 2000s, in the United Kingdom through Abbey National and later Alliance & Leicester and Bradford & Bingley during the financial crisis, in Brazil through Banco Real, and in consumer finance across continental Europe.

The strategic insight was that a bank from a mid-sized European economy could not achieve scale at home, so it acquired retail banking positions in markets where its capital and operating model were competitive. Latin America in particular offered structurally higher margins than European retail banking.

The model has been federated rather than integrated: subsidiaries are separately capitalised and funded, which limits contagion between markets and satisfies host regulators, at the cost of some of the efficiency a single balance sheet would provide.

What produced the 2025 result?

Operating discipline more than a favourable rate environment. Revenue was stable at €62.4bn, with record net fee income, while operating expenses fell in euro terms as the group’s transformation programme consolidated technology onto shared global platforms.

The efficiency ratio improved to around 41%, the best level in more than fifteen years, and credit quality strengthened with the cost of risk at 1.15% and a non-performing loan ratio near 2.9%, historically low levels supported by low unemployment across most of the group’s markets.

Fourth-quarter profit of €3,764m was up 15%, a seventh consecutive record quarter, and the momentum continued into 2026 with first-quarter underlying profit of €3,560m, up 12%.

What is the transformation programme actually doing?

Replacing a collection of national banks with shared global platforms. Historically Santander operated largely separate technology stacks in each country, which is expensive and slow. The current programme consolidates onto common platforms that allow scalable growth at a lower cost to serve.

The consumer finance business illustrates the direction. The group has been moving its European consumer finance operations under the Openbank brand, which grew deposits 37% to €28bn as part of a strategy to lower funding costs by gathering retail deposits directly rather than relying on wholesale funding.

The financial payoff is visible in the cost line: operating expenses falling in absolute terms while the customer base grows by eight million a year is the specific outcome a platform strategy is supposed to produce.

How does the geographic mix affect risk?

It diversifies the earnings and imports currency volatility. Profit reported in euros depends on the Brazilian real, Mexican peso, pound sterling, Polish zloty and other currencies, which is why the group reports variations in constant euros alongside statutory figures — a distinction that materially changes the growth rate.

Emerging market exposure also carries political and macroeconomic risk that European-only banks do not face. Argentina in particular has required separate treatment in the group’s reporting because of hyperinflationary accounting.

The offsetting benefit is genuine. Latin American retail banking has structurally higher margins than European, and a group with businesses across several economic cycles rarely sees all of them deteriorate simultaneously — which is the entire argument for geographic diversification.

What did the Poland and TSB transactions signal?

Active portfolio management rather than expansion at any cost. The sale of 49% of Santander Poland released capital that is being returned to shareholders, contributing roughly €3.2bn to the buyback programme approved with the 2025 results.

In the opposite direction, Santander agreed in July 2025 to acquire TSB, the United Kingdom banking arm of Banco Sabadell, for £2.7bn — adding scale in a market where Santander already operates and where subscale players struggle.

Together these transactions describe a group that treats country positions as portfolio holdings: reduce where the strategic value is lower than the capital released, add where scale improves an existing franchise. That is unusual discipline for a bank built by acquisition.

What are the challenges ahead?

Rate normalisation is the first. Net interest income across European and Latin American banking benefited from the rate cycle, and easing monetary policy compresses margins, which is why the 2026 guidance emphasises mid-single-digit revenue growth and lower costs rather than repeating 2025’s expansion.

The second is that the bank remains, in market terms, valued below its book value for much of its recent history despite double-digit returns on tangible equity — a discount applied to European banks generally and to emerging-market-exposed ones particularly.

The third is execution. A transformation programme spanning ten core markets and 180 million customers is among the largest technology undertakings in European business, and the difference between the platform strategy working and merely being announced is measured in years of consistent cost reduction.

How does Openbank fit the strategy?

As a low-cost funding engine and a template for digital banking across the group. Openbank grew deposits 37% to €28bn as part of a deliberate strategy to gather retail deposits directly, reducing reliance on more expensive wholesale funding.

The group has indicated it will gradually operate its European consumer finance businesses under the Openbank brand, which consolidates several national operations behind a single digital proposition rather than maintaining separate brands and platforms in each market.

That is the platform strategy applied to a specific business line. Consumer finance is high-margin, data-intensive and well suited to digital distribution, and running it as one European business rather than several national ones is where the cost advantage sits.

How does Santander compare with its European peers?

It is larger, more diversified and more profitable than almost all of them, and it trades at a valuation that reflects European banking sentiment rather than its own returns. A return on tangible equity above 16% would command a premium multiple in most other sectors.

The comparison that matters is with American banks rather than European ones. Santander’s scale and profitability place it in that conversation, while its valuation does not, and closing that gap is the strategic ambition behind both the platform programme and the buyback commitment.

The obstacle is structural rather than company-specific. European banks trade at discounts because of fragmented markets, heavy regulation, negative rate memories and low growth. A single bank cannot fix that; it can only demonstrate returns and distribute capital until the market reprices.

What is the outlook for 2026?

Moderating growth with continued distribution. The bank has targeted mid-single-digit revenue growth in constant euros excluding perimeter effects, lower costs, higher profits and a CET1 ratio of 12.8% to 13%, slightly below the 13.5% reached at the end of 2025.

That guidance implies deliberately running capital down toward the operating range by distributing the excess, which is consistent with the commitment to at least €10bn of buybacks. A bank targeting a lower capital ratio is signalling confidence rather than weakness.

First-quarter 2026 underlying profit of €3,560m, up 12%, indicates the momentum continued into the new year, driven by the platform programme and lower cost to serve rather than by margin expansion.

How important is Latin America to the group?

Decisively. Brazil and Mexico between them contribute a very large share of group profit, and Latin American retail banking operates at structurally wider margins than European banking because of higher rates, lower banking penetration and less competitive intensity.

That exposure is also why the market applies a discount. Currency volatility, political risk and the periodic macroeconomic instability of the region mean investors capitalise those earnings at a lower multiple than equivalent European profits.

The strategic response has been to build genuinely local banks rather than branches: separately capitalised, locally funded, locally managed subsidiaries that satisfy host regulators and can withstand a domestic shock without group support.

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