Premarket roundup: Dell, Pfizer

(AP) - Among the premarket stories for Friday, June 11, from AP Financial News:

- Dell Inc. shares slipped ahead of regular trading after the computer maker said that it is setting aside $100 million to cover potential costs related to an ongoing accounting probe.

- Shares of Bristol-Myers Squibb and Pfizer rose before the market opened on news that a late-stage study showed their potential irregular heart rhythm drug was effective.

- An Oppenheimer analyst boosted his investment rating on Idenix Pharmaceuticals Inc., citing the market potential for the biotechnology company's hepatitis C treatments.