...S&P Global Ratings expects Capital One Financial Corp. (Capital One)'s acquisition of Discover, announced in February 2024, to close in 2025 subject to necessary regulatory approvals. In our view, the benefits of the acquisition to Capital One in market share, profit synergies, and payment processing capability will be roughly balanced against a higher concentration in credit cards and considerable execution risk. Post-acquisition, Capital One will likely become the largest credit card lender in the U.S.--the acquisition would increase its asset size by about 30%. We note that Discover's outstanding regulatory/compliance issues add incremental complexity to the merger process (see "Capital One Financial Corp. '###' Rating Affirmed On Announced Acquisition Of Discover Financial; Outlook Remains Stable," published Feb. 21, 2024, on RatingsDirect)....