Banco Santander has completed its acquisition of Webster Financial, converting a six-month regulatory process into a much larger U.S. banking franchise. The Spanish group closed the cash-and-stock transaction Thursday after receiving approval from the Office of the Comptroller of the Currency on June 12, the European Central Bank on July 21 and the Federal Reserve on August 4. The deal was originally valued at about $12.2 billion.
Webster shareholders receive $48.75 in cash and 2.0548 Santander shares for each Webster share. At the terms announced in February, that represented $75 per share, with approximately 65% of the consideration in cash and 35% in newly issued Santander shares. Closing removes the risk that the transaction could be delayed by regulators. It also begins the more difficult stage, when projected funding benefits and cost savings must be delivered without disrupting customers or weakening credit discipline.
The combined U.S. operation has approximately $327 billion in assets, $185 billion in loans and $172 billion in deposits, based on figures at the end of 2025. Santander says the combination creates a top-ten U.S. retail and commercial bank by assets and a top-five deposit franchise across important Northeastern states. The group will serve about eight million U.S. customers, while Webster’s former headquarters in Stamford, Connecticut, will remain a core corporate office.
The strategic logic is balance rather than scale alone. Santander’s American business has been strongest in consumer finance, while Webster brings a commercial banking franchise, a healthcare financial-services business and a deposit base concentrated in affluent Northeastern markets. Santander expects the combined net loan-to-deposit ratio to improve to roughly 100% from 109% for its existing U.S. operation. A more balanced funding profile could reduce reliance on costlier wholesale or promotional funding and make the U.S. business less sensitive to shifts in deposit pricing.
Those benefits are still forecasts. Santander is targeting approximately $800 million of annual pretax cost savings by the end of 2028, equal to about 19% of the combined cost base. It expects the U.S. efficiency ratio to fall below 40%, return on tangible equity to reach about 18% and the transaction to add roughly 7% to 8% to group earnings per share by 2028. The bank also projects a return on invested capital of approximately 15%.
The targets make integration the central investment question. Achieving $800 million of savings will require consolidating overlapping functions, technology and operations while retaining the deposit relationships and commercial bankers that made Webster attractive. Moving too slowly would weaken the return on the purchase price. Moving too aggressively could create customer attrition, service problems or operational failures. Santander’s transaction disclosures identify delayed integration, higher costs, customer and employee reactions, credit quality and additional regulatory requirements among the principal risks.
Capital management is another constraint. Santander reported a 14.0% common equity tier 1 ratio at the end of June, before the Webster impact, and has said it remains positioned to finish 2026 between 12.8% and 13% after its recent acquisitions. The bank has also maintained its share-buyback targets. That combination leaves less room for an integration miss: management is promising growth, capital returns and a substantial U.S. integration at the same time.
Leadership continuity should reduce some execution risk. Christiana Riley remains Santander’s U.S. country head and chief executive of Santander Holdings USA. John Ciulla, previously Webster’s chief executive, becomes chief executive of Santander Bank, while former Webster president and operating chief Luis Massiani takes the operating role at both Santander Holdings USA and Santander Bank, with responsibility for integration. Keeping Webster leaders in senior positions may help preserve local relationships as systems and products are combined.
For Santander, the acquisition changes the relevance of the United States within the group. A business that had a relatively loan-heavy funding mix and less commercial breadth now has a larger deposit base and deeper commercial capabilities, at a price that requires those advantages to show up quickly in profitability. The regulatory milestone is complete, but the financial case is not. Investors should judge the deal by deposit retention, the cost of funding, credit performance, integration expenses and progress toward the 2028 efficiency and return targets. The purchase has delivered U.S. scale. It must now prove that scale can become durable returns.