Employees at the personal computer plant, as well as other Olivetti facilities, walked out for a couple hours, union members told the Associated Press. The workers staged the protest to draw attention to their concerns that a sale of the division will cost them their jobs.
Union members also reportedly said more walkouts may be held next week.
This is just one of the latest problems to hit the troubled computer maker, which has been plagued with millions in losses, a management shakeup, and investigation into its financial reporting practices.
The walkout comes a day after the company's new chief executive, Roberto Colaninno, met with London's financial community to ease concerns about the future of the Italian company.
The company maintains a workforce of about 28,000 people.