Israeli holding company Koor Industries Ltd. (KOR.TV) said Tuesday it has invested an additional 1 billion shekels ($268 million) in Credit Suisse Group (CS) in recent weeks, even though its holding in the Swiss bank is falling in value.

Credit Suisse shares have dropped about 13% since the beginning of 2010, Koor said, which means its ILS6 billion investment in the bank is now worth only ILS5.44 billion.

But Koor, which has been buying and selling shares in Credit Suisse since July 2008, has made a total of ILS3.2 billion on past Credit Suisse investments.

Koor now holds 2.78% of Credit Suisse.

The Israeli firm said it bought additional shares while they are lower because it expects the bank's shares to go back up, allowing it to eventually make a profit on its investment.

At 0758 GMT, Credit Suisse shares were down ILS0.50, or 0.45%, at ILS110.00, in a lower Tel Aviv market.

-By Sara Toth Stub, contributing to Dow Jones Newswires; saratoth@gmail.com