Marketing Costs as a % of Revenues for each of the 5 largest U.S. commercial banks in 2018 was as follows:
3.0% for JPMorgan Chase2.1% for Citigroup1.9% for U.S. Bancorp1.8% for Bank of America1.0% for Wells Fargo
In comparison, Capital One's Marketing Costs were 7.7% of its Revenues for 2018. This difference can be attributed to Capital One focus on the highly competitive card lending business, which requires it to spend a larger proportion of its revenues in advertising & promotional activities.
Click here to understand how changes in Capital One's Marketing Costs affect its earnings and stock.