NB BANCORP (NBBK) shares surged 5.25% in pre-market trading on Friday, following the release of its impressive financial results. The company reported a substantial increase in its net profit margin and year-over-year earnings, significantly outperforming both its own historical performance and industry averages.

The banking institution posted a remarkable net profit margin of 30.7%, a considerable jump from last year's 8.9%. This improvement demonstrates NB BANCORP's enhanced operational efficiency and effective cost management. Additionally, the company's earnings soared by 350.6% year-over-year, far exceeding its five-year average annual growth rate of 22.3%.

Despite the strong financial performance, NB BANCORP's stock still appears attractively valued. The company is trading at a Price-to-Earnings ratio of 11.2x, which is lower than both its peer group average of 11.9x and the US Banks industry average of 11.3x. This valuation, combined with the company's exceptional profit growth and margin expansion, likely contributed to the pre-market stock surge as investors recognize the potential for further upside. However, it's worth noting that the current share price of $18.27 is trading above the estimated fair value of $7.33, which may prompt some investors to exercise caution despite the strong fundamentals.