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The four are Caldera International; SuSE Linux; Conectiva, and Turbolinux, along with more than a dozen hardware and software vendors including IBM, Hewlett-Packard, Advanced Micro Devices and Intel.
UnitedLinux was announced in May by the vendors, which are working to create and sell a standardised enterprise version of Linux to encourage its widespread adoption in business computing.
However, other key Linux vendors, including US market leader Red Hat and MandrakeSoft are not part of UnitedLinux.
Last month, HP and Red Hat announced that they would support the Itanium 2 processors with their products.