Capital One seeking to acquire Discover

(CNN)– The Wall Street Journal reports Capital One is buying Discover Financial Services, citing people familiar with the matter.

The deal would combine two of the largest credit card companies in the United States.

The Journal reports the all-stock deal could be announced as early as tomorrow.

Capital One has a market value of more than $52 billion.

Discover’s market value is $28 million. The merger would be one of the biggest mergers this year.

Capital One uses Mastercard and Visa for most of its cards.