Unfortunately for some shareholders, the National Security Group (NASDAQ:NSEC) share price has dived in the last thirty days. The bad news is that the recent drop obliterated the last year's worth of gains; the stock is flat over twelve months.

Assuming no other changes, a sharply higher share price makes a stock less attractive to potential buyers. In the long term, share prices tend to follow earnings per share, but in the short term prices bounce around in response to short term factors (which are not always obvious). The implication here is that deep value investors might steer clear when expectations of a company are too high. Perhaps the simplest way to get a read on investors' expectations of a business is to look at its Price to Earnings Ratio (PE Ratio). A high P/E implies that investors have high expectations of what a company can achieve compared to a company with a low P/E ratio.

View our latest analysis for National Security Group

How Does National Security Group's P/E Ratio Compare To Its Peers?

We can tell from its P/E ratio of 26.32 that there is some investor optimism about National Security Group. The image below shows that National Security Group has a higher P/E than the average (16.7) P/E for companies in the insurance industry.

That means that the market expects National Security Group will outperform other companies in its industry. Shareholders are clearly optimistic, but the future is always uncertain. So investors should always consider the P/E ratio alongside other factors, such as whether company directors have been buying shares.

How Growth Rates Impact P/E Ratios

Companies that shrink earnings per share quickly will rapidly decrease the 'E' in the equation. Therefore, even if you pay a low multiple of earnings now, that multiple will become higher in the future. So while a stock may look cheap based on past earnings, it could be expensive based on future earnings.

National Security Group's earnings per share fell by 51% in the last twelve months. And EPS is down 28% a year, over the last 5 years. This might lead to muted expectations.

A Limitation: P/E Ratios Ignore Debt and Cash In The Bank

It's important to note that the P/E ratio considers the market capitalization, not the enterprise value. In other words, it does not consider any debt or cash that the company may have on the balance sheet. In theory, a company can lower its future P/E ratio by using cash or debt to invest in growth.

Spending on growth might be good or bad a few years later, but the point is that the P/E ratio does not account for the option (or lack thereof).