Updated from 8:07 a.m. EST

Research In Motion

(RIMM)

said it expects fourth-quarter revenue to be at or near the midpoint of its previously forecasted range, while gross margins and per-share earnings are expected to be at the low end.

In December, the BlackBerry maker said it expected fourth-quarter revenue of $3.3 billion to $3.5 billion, with earnings in the range of 83 cents to 91 cents a share. The company said previously it expected gross margin of 40% to 41%.

RIM said it now expects net subscriber account additions for the fourth quarter to be more than 20% higher than the 2.9 million net subscriber account additions it forecasted in December.

"A variety of factors, including product mix, lowered channel inventory levels and an increased ratio of new subscriber sales to upgrade and replacement sales, are contributing to the degree of outperformance in subscriber growth relative to revenue and earnings performance within the quarter," the company said Wednesday.

The company said it had record levels of net subscriber account additions throughout December and continued to see strong levels following the holiday buying season. RIM said subscriber performance in both North America and international markets has exceeded its earlier expectations. The company expects more normalized net subscriber account additions in the first quarter.

In premarket trading, RIM shares were down about 11% to $50.68.