The mission of a bank is to operate a safe and sound financial institution, while creating shareholder value. The value of a bank, defined by the ratio of market value to common equity, most often is directly related to the return on equity (ROE) less the cost of equity capital (COE). The enclosed chart illustrates the benefits of living on the slope, or realizing a higher market value to common equity as the spread between ROE and COE increases.
The Market Capitalization/Book Common Equity compared to IDC's ROE less COE for midcap bank holding companies in the enclosed chart demonstrates the usefulness of a cost of equity capital tied to the long-term U.S. Treasury yield to determine the price to book value. IDC defines ROE as net operating profit after tax (NOPAT ROE). The level of long term bond yields, size of the bank, and standard deviation of the operating margin (inverse to the efficiency ratio) define risk in calculating COE.
The benefits of a high market capitalization to common equity are twofold. As an example, one benefit is Signature Bank (SBNY) sells at a market value equal to 2.6-times equity due to a spread of ROE less COE of 8.6%. The second benefit is a high ROE generates a high reinvestment rate or growth in common equity, thereby increasing market value at the reinvestment rate.
Signature bank totes a simple business model stressing loans and deposits with only a few branches. Their customers tend to be private businesses and high profile individuals. The bank, with almost $30 billion in assets, has a very clean balance sheet and very low noninterest expense when compared with its peers. Although heavily weighted in commercial real estate loans, Signature Bank has been able to maintain low levels of non-performing assets. They also prefer to avoid high-risk derivatives. All of these helped to fuel 23 consecutive quarters of earnings growth, which, in their case, led to increasing share values; their shares increased 345% in the last decade and outperformed its peers.