Fifth Third finished folding Comerica into its systems over Labor Day, creating a top-10 US bank

Fifth Third Bancorp finished the technology and brand conversion of Comerica over Labor Day weekend 2026, the operational milestone that follows the acquisition’s close on February 1, 2026. The conversion moved approximately 600,000 customer accounts and 293 banking centers onto Fifth Third’s systems and branding, the step where a bank merger actually becomes visible to ordinary customers — new cards, new online banking logins, and rebranded branches.

The combined institution now holds more than $300 billion in assets, placing it around ninth-largest by assets among US banks — a scale jump that matters competitively against other large regional banks and, increasingly, against the very largest national banks for corporate and wealth-management clients. Deals of this size carry real execution risk during conversion weekends: account access outages, card-reissuance friction and customer-service strain are common, and the smoothness of a systems migration this large is typically judged in the weeks immediately following it.

On the financial side, Fifth Third is targeting $850 million in annual pretax expense savings by the end of 2026, as part of a broader $1 billion in projected total synergies from the deal. That combination of cost cuts and revenue opportunities is the standard playbook for bank mergers — consolidating overlapping branches, combining back-office and technology functions, and cross-selling each bank’s products to the other’s customer base — and the Labor Day conversion is the point at which Fifth Third can begin actually realizing those savings rather than merely planning for them.

The Comerica deal fits a broader wave of regional-bank consolidation that has continued through 2026, as mid-sized banks look to scale to compete with both the largest national banks and a growing set of well-capitalized fintech challengers. Whether Fifth Third hits its stated synergy targets, and how customer retention holds up through the conversion, will be the metrics worth watching in Fifth Third’s upcoming quarterly disclosures.