Banco Santander has completed its acquisition of Webster Financial Corporation of Stamford, Connecticut, in a transaction valued at approximately $12.3 billion, the Spanish bank confirmed as the deal closed on 20 August. The tie-up was originally announced on 3 February 2026 and ranks among the most significant transatlantic banking deals in recent years.
The valuation is based on Santander's share price on 2 February 2026, the day before the deal was announced. Under the terms, Webster shareholders receive $48.75 in cash per share, together with 2.0548 Santander American depositary shares, giving them a mix of immediate cash and continued equity exposure to the enlarged group.
SHARE ISSUANCE AND CAPITAL IMPACT
To fund the equity component of the consideration, Santander issued 329,846,438 new shares, raising €3.56 billion, or approximately $4.16 billion. That represents one of the group's largest share issuances in recent years and reflects the scale of the transaction relative to Santander's existing capital base and its careful sequencing of the funding steps.
Following completion, Webster's former shareholders own close to 2.2% of the enlarged Santander group. That level of dilution is meaningful but modest given the size of the target, reflecting the mix of cash and stock in the consideration and the sheer scale of Santander's pre-existing market capitalisation.
The addition of Webster gives Santander a significantly larger footprint in the north-eastern United States, complementing its existing US operations, which have historically been concentrated in the north-east and in auto finance nationwide. Webster is a mid-sized US commercial bank with a strong deposit franchise and lending platform in its home region.
COMPLETION AFTER SIX-MONTH APPROVAL PATH
The roughly six-and-a-half-month path from announcement on 3 February to closing on 20 August reflects the standard timeline for cross-border US bank mergers, which require clearance from federal banking regulators, competition authorities and, in the case of a European buyer, cooperation with the home-country supervisor in Madrid.
Now that the transaction has closed, Santander will begin the integration of Webster's operations, systems and client base into its existing US structure. Deals of this magnitude typically involve multi-year integration programmes covering IT, branding and product rationalisation, and management can be expected to lay out milestones over the coming quarters.
The share-based portion of the consideration means Webster's legacy investors have exchanged their exposure to a mid-cap US regional lender for a small holding in a much larger, globally diversified banking group. Santander shares trade in Madrid and via American depositary shares in the United States, giving former Webster holders continued liquidity in familiar markets. The mechanics of that exchange were spelled out in the transaction documents circulated ahead of closing, allowing shareholders to plan for the change in the profile of their holding.
For Santander, the completion delivers on chairman Ana Botín's long-standing ambition to build a meaningful US commercial banking franchise to complement the group's positions in Spain, the United Kingdom, Brazil, Mexico and other markets. The completion was disclosed via a formal statement on the group's corporate channels and covered in specialist trade press, marking the formal start of the enlarged group's life as one of the larger banking platforms operating across both sides of the Atlantic.