The Palo Alto-based tech giant is due to post its quarterly results after the markets close today.
Today's numbers will come after HP preannounced better-than-expected fourth-quarter earnings last week.
Though its 2009 guidance was also above forecasts, some investors are worried the company might be too optimistic.
There are also concerns about HP's heavy exposure to hardware sales.
More than half of the company's sales come from personal computers and servers and storage machines.
It's an area hit hard by a clampdown in spending on technology.