JPMorgan Chase & Co. (JPM), Wells Fargo (WFC), and Citigroup (C) all reported second-quarter earnings Friday morning, providing a view into the US banking industry based on these companies' varied net interest income (NII) figures.

"The major positive case for a lot of banks is that you're close to seeing a trough in quarterly net interest income, and that in the back end of the year, you're going to start to see some sequential growth," HSBC head of US financials research Paul Martinez tells Yahoo Finance, underlining the pressure higher for longer interest rates have placed on bank growth.

Martinez reacts to this morning's bank results, comparing the health of these Big Banks' business segments to their net interest income.

For more expert insight and the latest market action, click here to watch this full episode of Morning Brief.