Oct. 20 (Bloomberg) -- Allot Communications Ltd., Israel’s biggest maker of high-speed networking equipment, tumbled the most in almost three weeks, leading declines on the Bloomberg Israel-US 25 Index.

Shares of the Hod Hasharon, Israel-based company retreated 7.7 percent to $11.48 by 12:44 p.m. in New York, the most since Sept. 30. The drop pushed the benchmark of the biggest Israeli companies traded in New York 1.7 percent lower to 83.96. Allot’s Tel Aviv shares fell 2.8 percent to 46.15 shekels on Oct. 18, or the equivalent of $12.57.

ClickSoftware Technologies Ltd., the company that counts EON AG and PG&E Corp. as customers for software that helps track orders, led gains on the Bloomberg Israel-US 25 Index, rising 1.2 percent to $9.62

Teva Pharmaceutical Industries Ltd., the world’s largest maker of generic drugs, retreated 2.6 percent to $38.09.

--Editors: Marie-France Han, Richard Richtmyer

To contact the reporter on this story: Tal Barak Harif in New York at tbarak@bloomberg.net

To contact the editor responsible for this story: Tal Barak Harif at tbarak@bloomberg.net