AT&T will cut roughly 1.5 percent of its workforce, primarily among its management ranks, according to a filing Friday with the Securities and Exchange Commission.

The move is part of its "next step in streamlining its operations," following its acquisitions of several regional companies in recent years. AT&T expects to take a pre-tax charge of $374 million in the first quarter as a result of the layoffs.

AT&T said that most of the positions will be in areas that have little contact with customers and that it's workforce is expected to remain stable through the rest of the year.

The layoffs come as AT&T prepares to announce its quarterly results Tuesday.