Credit Suisse shares tumbled to a record low on Friday, taking their decline this year to more than 50 per cent, following a report that the embattled bank was sounding out investors for a new capital raise. Investors were responding to an article published by Reuters on Thursday afternoon that said the bank had been contacting investors to gauge interest in a fresh capital raise and that it was considering pulling its investment bank out of the US. Credit Suisse did not comment on the capital raise, but denied it was planning to exit the US market.