Northrop Grumman Corporation completed the final step in its acquisition of Litton Industries Inc. by converting Litton's preferred stock into the right to receive $35 per share in cash. Letters of transmittal and other documents necessary for the exchange of stock will be mailed to Litton shareholders as promptly as practicable. Northrop Grumman Corporation is a $15 billion, global aerospace and defense company with its worldwide headquarters in Los Angeles.