Tech Stocks in Motion

Updated from 1:02 p.m. EDT

Shares of Taser International(TASR Quote) were among the best-performing technology stocks Monday, rising 16.4% after the Department of Homeland Security said its stun guns could be used on commercial flights in the U.S.

Specifically, Taser announced that a major international airline received approval from the Department of Homeland Security's Transportation Security Administration, which would permit trained personnel to use stun guns on flights to and from the U.S. The company, however, did not identify the airline or say if any stun guns were ordered. Shares of Taser traded up $7.63 to $54.12.

Arch Wireless(AWIN Quote) rose 16.7% after the company announced late Friday that the U.S. Department of Justice's investigative staff would not challenge its merger with Metrocall Holdings(MTOH Quote). Shareholders approved the merger Monday morning. Once the companies receive final approval from the Federal Communications Commission, which is expected some time this week, they will become a subsidiary of a new holding company called USA Mobility. Arch shareholders will own about 73% of USA Mobility, and Metrocall will own the rest once the merger is completed. Shares of Arch traded up $4.66 to $32.57. Shares of Metrocall traded down 59 cents to $61.18.

Shares of Mediacom Communications(MCCC Quote) fell 6% after the company posted a third-quarter loss on weaker-than-expected sales. The cable television company posted a loss of 11 cents a share on sales of $261 million. Analysts polled by Thomson First Call were expecting a profit of 1 cent a share on sales of $266.1 million. Mediacom said that Hurricane Ivan disrupted operations in many of its cable systems in Alabama, Florida and Mississippi during the quarter. Excluding the impact of Hurricane Ivan, the company's sales would have been $263.9 million, it said. The company's quarterly loss, meanwhile, was exacerbated by a derivatives loss of $4.2 million. A year ago, Mediacom recorded a gain on derivatives of $9 million. Shares traded down 40 cents to $6.25.