To arrive at Earnings per Share (EPS) pre-tax profits are divided by the amount of shares issued to get a figure for the amount of wealth that's been created per share by the company. As profits are reported on a quarterly basis, the 'latest' EPS will either be from the last quarter or the last financial year. Even though it's net profits that a shareholder will actually benefit from, the net profit figure shouldn't be used for EPS because changes to the tax regime and companies differing treatment of tax will affect data comparisons across time and between shares. So the pre-tax figure is best for comparison.
The portion of a company's profit allocated to each outstanding share of common stock. EPS serves as an indicator of a company's profitability.
In the EPS calculation, it is more accurate to use a weighted-average number of shares outstanding over the reporting term, because the number of shares outstanding can change over time. However, data sources sometimes simplify the calculation by using the number of shares outstanding at the end of the period.