Summit Materials, Inc.'s (NYSE:SUM) stock wasn't much affected by its recent lackluster earnings numbers. Our analysis suggests that they may be missing some concerning details underlying the profit numbers.

Check out our latest analysis for Summit Materials

In order to understand the potential for per share returns, it is essential to consider how much a company is diluting shareholders. In fact, Summit Materials increased the number of shares on issue by 46% over the last twelve months by issuing new shares. That means its earnings are split among a greater number of shares. Per share metrics like EPS help us understand how much actual shareholders are benefitting from the company's profits, while the net income level gives us a better view of the company's absolute size. You can see a chart of Summit Materials' EPS by clicking here.

How Is Dilution Impacting Summit Materials' Earnings Per Share (EPS)?

Summit Materials has improved its profit over the last three years, with an annualized gain of 2.2% in that time. In contrast, earnings per share were actually down by 24% per year, in the exact same period. Net profit actually dropped by 52% in the last year. But the EPS result was even worse, with the company recording a decline of 65%. So you can see that the dilution has had a fairly significant impact on shareholders.

If Summit Materials' EPS can grow over time then that drastically improves the chances of the share price moving in the same direction. However, if its profit increases while its earnings per share stay flat (or even fall) then shareholders might not see much benefit. For the ordinary retail shareholder, EPS is a great measure to check your hypothetical "share" of the company's profit.

That might leave you wondering what analysts are forecasting in terms of future profitability. Luckily, you can click here to see an interactive graph depicting future profitability, based on their estimates.

The Impact Of Unusual Items On Profit

Alongside that dilution, it's also important to note that Summit Materials' profit was boosted by unusual items worth US$93m in the last twelve months. We can't deny that higher profits generally leave us optimistic, but we'd prefer it if the profit were to be sustainable. We ran the numbers on most publicly listed companies worldwide, and it's very common for unusual items to be once-off in nature. Which is hardly surprising, given the name. If Summit Materials doesn't see that contribution repeat, then all else being equal we'd expect its profit to drop over the current year.