Authentidate Holding Corp. (Nasdaq: ADAT) shares shot forward 22.2% to 88 cents, on volume of nearly 532,000 shares, compared to an average of just under 120,000, after it announced that it has been selected by the Department of Veteran Affairs (VA) as a supplier for its Telehealth Program, already one of the largest in the world.

Sirius XM Radio Inc. (Nasdaq: SIRI) made its presence felt Monday afternoon, dealing in 24.9 million shares, compared to a daily average of 54.2 million. Share prices improved 2% to $1.80.

Community Health Services Inc. (NYSE: CYH) skidded 32.4% to $27.26 Monday, on share volume of 25.7 million, triumphing over a daily average of 1.3 million, on word the company was being sued by Tenet Healthcare.