Key Takeaways COF fell 4.9% in a month, outperforming peers but lagging the industry and broader market indexes.Discover Financial's $35.3B acquisition boosts COF's scale, card offerings and digital banking reach.COF's strong balance sheet supports dividends and buybacks, but rising expenses and credit losses pose risks.In the past month, Capital One Financial Corporation (COF) stock has declined 4.9%, outperforming its close peers — Ally Financial (ALLY) and OneMain Holdings, Inc. (OMF) . However, it has u ...