When Selling a Failed Bank Preserves Credit—But Not Every Loan
The 7 June 2017 sale of Banco Popular Español to Banco Santander is a useful case for a deceptively simple question: when a failing bank is sold, what exactly is being preserved? This series uses that resolution to examine the difference between preserving a bank’s operating franchise and preserving every borrower’s loan on unchanged terms. That distinction matters because a bank failure can interrupt the relationships through which firms obtain working capital, investment finance, and day-to-day liquidity even when depositors and critical functions are protected. The case supports a practical judgment: a private transfer can limit a credit shock, but only through selective choices shaped by borrower risk, competing lenders, the buyer’s commercial incentives, and the buyer’s capital capacity.
The question hidden inside a bank sale
A failed bank is not simply a pile of loans waiting for a new owner. It is also a network of borrowers, staff, payment arrangements, information, and expectations about who will continue to lend. A small or medium-sized firm may have built a relationship with one bank over years. That relationship can contain knowledge that is difficult to reproduce from a balance sheet alone: how the firm’s cash flows behave across seasons, which collateral is reliable, and whether a temporary shortfall is a warning or an ordinary business fluctuation. If the lender disappears abruptly, another bank may not treat the existing loan as an intact relationship. It may reassess the borrower, demand more collateral, shorten maturity, or decline to renew credit.
Resolution policy therefore has two connected objectives. It must prevent the failure from becoming a disorderly event for depositors and the financial system, but it must also determine how much of the failed institution’s useful operating capacity can continue in private hands. The first objective is visible in public debate. The second is often hidden because a successful transfer can look like a simple change of ownership. Yet the economic result depends on what happens after the legal transfer: which relationships remain active, which borrowers lose alternatives, and where the acquiring bank places the strain on its own balance sheet.
This is why “the bank was sold” is an incomplete description of success. A sale may preserve the payments system, deposits, branches, and a customer franchise while still changing the allocation of credit. Some loans may continue because the buyer values the relationship. Others may contract because they use too much capital, carry too much risk, or no longer fit the buyer’s strategy. Aggregate lending can therefore appear stable while the burden of adjustment falls unevenly across borrowers and across the buyer’s old and new customers.
The Banco Popular case makes this distributional question unusually clear. The failed bank was important enough for its disruption to matter, but the resolution did not rely on a public recapitalization that would have obscured the private incentives involved. The buyer had to absorb the business, decide how to manage its inherited relationships, and operate under the capital consequences of doing so. At the same time, other banks remained free to respond to the same borrowers. The outcome was consequently a joint product of the transaction, Santander’s choices, and the competitive reaction around it.
What happened to Banco Popular
Banco Popular Español was Spain’s sixth-largest bank at the time of its failure, with assets of nearly €150 billion and important businesses beyond Spain. It was especially significant in lending to small and medium-sized enterprises. The event was not presented by the authorities as a slow, orderly wind-down. After a severe deterioration in liquidity, the European Central Bank determined on 6 June 2017 that Banco Popular was “failing or likely to fail” and notified the Single Resolution Board. The next day, the SRB decided that resolution was in the public interest and approved a sale-of-business scheme. Spain’s national resolution authority, FROB, implemented it.
The sequence matters because it identifies what the transaction was intended to do. The SRB transferred Banco Popular’s shares and capital instruments, including the business and its subsidiaries, to Banco Santander. Santander paid €1 for the shares and instruments after the resolution authorities had written down the failed bank’s capital claims. The SRB’s contemporaneous account said the action protected depositors and critical functions, supported financial stability in Spain and Portugal, and avoided the use of public funds. The BIS account likewise describes a transfer without a bridge bank or an asset-management vehicle to manage the transition.
“No public funds” does not mean that the event had no cost. It means that the resolution did not use a taxpayer-funded bailout to restore Banco Popular’s solvency before the transfer. Losses were imposed on private capital holders, while Santander took on a business whose integration affected its own capital position. The distinction is central: private loss absorption changes who bears the immediate burden, but it does not make the underlying loans safer or guarantee that every borrower will receive the same financing afterward.
The authorities’ objective was continuity at the level that matters for financial stability. Banco Popular could operate under Santander rather than enter a disorderly bankruptcy. Depositors could remain connected to a functioning bank, and critical functions could continue. For business borrowers, however, continuity had to be enacted through later lending decisions. A legal transfer could carry customer relationships into Santander’s franchise, but the buyer still had to decide which relationships to deepen, maintain, renegotiate, or allow to run down.
Santander had a reason to take those relationships seriously. Banco Popular was a leading SME lender, and the acquisition sharply expanded Santander’s position in Spanish SME lending. That made the transaction more than a rescue of isolated assets. It gave Santander access to a customer base and local lending presence that could generate future business. But the same acquisition also imposed a balance-sheet burden. The buyer’s interest in protecting the acquired franchise and its need to conserve capital were present at the same time. The central question is therefore not whether Santander “saved” Banco Popular in the abstract. It is how the buyer allocated scarce capacity after the transfer.
A case about continuity, not sameness
The case can be understood through three connected relationships. First, borrowers inherited from Banco Popular were exposed to the decisions of banks that had not participated in the transaction. Those competing lenders could treat the failure as information about borrower risk or as uncertainty about the future of the relationship. Second, Santander controlled the transferred relationships and had a commercial interest in preserving the value of the newly enlarged franchise. Third, Santander’s capital position limited how much support it could provide without adjusting another part of its loan book.
That structure produces a more precise definition of credit preservation. It does not mean that every loan survives, that every borrower receives more funding, or that the acquiring bank expands lending across the board. It means that a resolution can preserve enough lending relationships and financing capacity to prevent the failure from producing a broad contraction in firms’ access to credit. The protection may be concentrated where the relationship is most valuable, where competing banks are most likely to withdraw, or where losing the customer would damage the buyer’s future franchise.
The evidence examined later in this series follows each part of that model. It asks whether banks outside the transaction reduced lending to Banco Popular’s borrowers, whether the response was stronger for riskier firms, and whether Santander treated inherited borrowers differently from its own pre-existing customers. It then asks why such a pattern would make commercial sense. A buyer might preserve a vulnerable but viable SME relationship because allowing the customer to fail—or forcing it to move to a rival—would destroy the value of the acquired franchise. That interpretation must still be tested against alternatives such as market power, zombie lending, or a reversal of credit tightening before the failure.
Finally, the case asks where the cost of continuity landed. If Santander protected selected inherited borrowers while its capital ratio was under pressure, it may have had to slow or reduce lending elsewhere. This is not a contradiction. It is the likely form of a constrained choice. A bank with limited capital can preserve one set of relationships by changing the composition of another set of exposures. The important policy question is not merely how much credit remained in aggregate, but whether the reallocation protected economically important firms without creating a larger weakness inside the acquiring bank.
The same distinction also explains why the case should not be reduced to a headline that a private bank sale “worked.” The result was conditional on an acquirer willing and able to preserve relationships, on other lenders’ reactions, and on the availability of enough capital to carry the transferred business. It also leaves distributional questions that an average lending number can hide: which firms were protected, which existing customers absorbed the adjustment, and whether the form of credit—maturity, term lending, collateral, or relationship survival—changed even when total credit did not.
Banco Popular thus provides a disciplined starting point for this series. A resolution is not a magic eraser for failure, and a transfer of ownership is not a promise to keep every loan unchanged. It is a reallocation problem. The bank’s franchise may survive, but its survival is produced by decisions about losses, relationships, risk, competition, and capital. Understanding the next step requires tracing precisely what the sale-of-business tool transferred, who absorbed the losses, and how operating continuity could be maintained after a failed bank ceased to stand on its own.