The German chipmaker posted a loss of 208m euros, or about $409m, down from a loss of 36m euros a year ago.
Revenue fell to 1.84bn euros ($2.7bn) from 2.29bn euros last year.
However, without including Qimonda’s performance or other charges, Infineon said it would have lost 25m euros ($36.5m) compared to 174m a year ago.
Infineon retains about 78% ownership of Qimonda, which debuted as a separate company on the New York Stock Exchange in 2006. Infineon has said it plans to reduce its stake in Qimonda to well below 50% in 2009.
