AstraZeneca was created in 1999 after a merger of Swedish pharmaceutical company Astra and the Zeneca Group of the U.K. It is the world's seventh-largest pharmaceutical company measured by revenue, which was $33.3 billion in 2010.
IBM and AstraZeneca declined to comment.
"We never comment individual client relationships," said a spokesman for IBM in Sweden.
"We won't give any comments on this at this time," a spokeswoman for AstraZeneca said.