Capital One Financial Corp. has bought Discover Financial Services, bringing together two of the biggest credit card firms so they can better compete with other Wall Street behemoths. The takeover was valued at $35 billion when it was announced in February 2024.

Capital One finalized its $35.3 billion purchase of Discover on Sunday, completing a credit card mega-merger announced more than a year ago. Nothing will immediately change for Discover customers, according to a press release issued Sunday by Capital One.

Through Friday, Capital One’s COF stock had returned 10.9% for 2025, while Discover shares had returned 16% as investors became more confident the deal would be completed. The KBW Bank Index had returned 2.8% so far this year. Those figures include reinvested dividends.