Capital One's acquisition of Discover brings it to the top of the ranking.

Almost 15 months after its announcement, Capital One Financial Corp.'s takeover of Discover Financial Services was officially completed on Sunday, creating the largest credit-card issuer by loan volume in the US.

The card processor came up short on expected profits but hit analysts' estimates on revenue in the second quarter of its fiscal 2025. CEO Ryan McInerney said growth in payments volume, cross-border volume and processed transactions were strong even in the face of shaky economic conditions.

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The credit card issuer trimmed its outlook on revenue and average loan growth, but maintained its target for net loss rates against the backdrop of an otherwise solid quarter. The company also announced a new co-branded credit card with Crypto.com. 

Capital One outlined some of its to-do items as it integrates with Discover, which include long-haul investments in technology, global marketing and risk management.

Synchrony Financial stands to benefit from the undoing of a Biden-era cap on credit card late fees. Company executives said that Tuesday that they won't be rolling back changes they implemented to compensate for revenue the company would have lost.

Both the Federal Reserve and the Office of the Comptroller of the Currency signed off on the $35 billion transaction, which has faced opposition since it was announced last February.

A federal judge in Texas found that the Consumer Financial Protection Bureau had violated the CARD Act by barring banks from charging late fees for credit cards.

In a settlement with bank trade groups that sued the Consumer Financial Protection Bureau, the Trump administration has agreed to drop the credit card late fee rule with prejudice.