The SCO Group has regained its listing on the Nasdaq stock exchange. Trading in the company's shares will resume later today when the markets open in New York.

The software vendor is best known for claiming ownership of the Unix operating system, and maintaining that Linux therefore violates its copyrights.

SCO has filed lawsuits against IBM and several Linux users for copyright violations, claiming billions of dollars in damages.

SCO's stock was suspended from Nasdaq in February after the company missed numerous deadlines for filing its annual report.

The company disclosed in March that it had to restate some of its 2004 earnings because of "accounting errors". The overdue annual report was filed on 1 April, together with three restated quarters for 2004.

SCO published its first quarter 2005 results last Thursday, reporting revenues of $8.9m, a 22 per cent decline relative to last year's first quarter. Losses increased to $3m, up 16 per cent on last year.