Hewlett Packard snatched the top position in global PC shipments from rival Dell by a slight margin in the third quarter of this year.
Gartner and IDC both reported the news when they released their respective quarterly studies on the PC market.
This is the first time HP has earned top honours since Q4 2003, Gartner said. Gartner estimates that HP shipped 9.652 million units, or 16.3 percent of the total, while Dell shipped 9.541 million, or 16.1 percent.
IDC reckoned it was a closer call, estimating 9.831 million units for HP and 9.803 million units for Dell, both equivalent to a 17.2 percent market share and a "statistical tie", the firm said in a statement.
The two market researchers calculated HP's growth compared with last year's Q3 at slightly over 15 percent, and both put Dell's growth at 3.6 percent.
They differed on the rate of growth worldwide for the entire market compared with last year's Q3. IDC said shipments grew by 7.9 percent to about 57 million units, slower than the 9.8 percent growth rate in Q2. Meanwhile, Gartner put the growth at 6.7 percent, or about 59 million units.
Both market researchers ranked Lenovo in third place, with IDC estimating its market share at 7.8 percent and Gartner placing it at 7.5 percent. Acer took fourth place, with Toshiba fifth.
IDC's study includes shipments of desktop, notebook, ultraportable and x86 server PCs, but not handhelds. Gartner's includes desktop PCs, mobile PCs and x86 servers, and excludes workstations.