Apple plans to buy back an additional $30 billion of its stock and raise its quarterly dividend by 8% amid a slowdown in revenue growth.

The commitment announced today as part of Apple's fiscal second-quarter earnings report expands on the company's previous pledge to spend $60 billion on stock buybacks by the end of next year.

Apple Inc. also is raising its quarterly dividend to $3.29 per share as part its effort to funnel more money to stockholders.