IBM is currently under investigation by the US Justice Department for allegedly taking advantage of its monopoly in the mainframe computer market.
The investigation began in response to complaints from the Computer and Communications Industry Association (CCIA) that IBM has been revoking software licences from clients that don't also buy its hardware.
Neither IBM nor the CCIA were available for comment, but the BBC reported that IBM denied the claim and said it will cooperate with regulators.
The anti-competition complaints against IBM centre on the company's licensing of its mainframe software, according to an article in The New York Times.
In August, similar accusations were filed against IBM by software developer T3 Technologies. A Manhattan judge dismissed the case last week.
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