Among the stock activity stories for Monday, May 20, from AP Business News:

— A BMO analyst downgraded Red Hat Inc. shares after their rally this month, and the software company's shares dropped.

— Shares of OSI Systems Inc. fell after the company said the government had begun proceedings related to its full-body scanners used in airports that had raised privacy concerns. The move could hurt OSI's U.S. government business.

 

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