Credit Suisse First Boston is leading a Sfr125m (€81m) convertible bond for Actelion, a Swiss biotechnology firm it took public just three years ago, and has improved the terms of the offer in the face of strong demand.

CSFB is both bookrunner and lead manager of the convertible sale. The five-year bond was initially launched with a coupon or interest payment of 0.5%, a yield to maturity of between 4.75% and 5.25% and a conversion premium of between 30% and 35%.