Hewlett-Packard reported a drop in revenue for the fourth straight quarter, hurt by weak PC sales and lower demand from corporates for its services.
Shares of the world's No.2 PC maker, which also forecast full-year adjusted profit largely below estimates, fell as much as 4 percent in extended trading on Thursday.
Chief executive Meg Whitman said the factors pressuring the PC market were expected to continue through the fourth quarter and well into the next fiscal year.
IDC said that PC sales fell 11.8 percent year-on-year in the second quarter of 2015, while Gartner put the fall at 9.5 percent, "the steepest PC shipment decline since the third quarter of 2013".
HP is splitting into two listed companies later this year, separating its computer and printer businesses from its faster-growing corporate hardware and services operations.
The 76-year-old company is nearing the end of a multi-year restructuring under Whitman, who has been cutting costs and focusing on higher-margin sales. The plan includes the elimination of about 55,000 jobs.
Chief financial officer Cathie Lesjak said the company expects the number of job cuts to increase by up to 5 percent by the end of October.
A relentless decline in PC sales has hurt the company hard. HP has reported a drop in quarterly sales in 15 of the last 16 quarters.
The decline in global PC sales was exacerbated in the second quarter of 2015 as customers awaited the release of Windows 10 in July.
As a result, revenue at HP's personal computer and printer businesses, its largest, fell 11.5 percent in the third quarter ended 31 July. Enterprise services division sales dropped 11 percent, while revenue at the enterprise group rose 2 percent.
Total revenue fell 8.1 percent to US$25.35 billion in the third quarter, also hurt by a strong dollar.
Reporting by Abhirup Roy in Bengaluru; Editing by Saumyadeb Chakrabarty