Credit Suisse First Boston (CSFB) has revealed that one of the initial public offerings where its allocation practice is being investigated by US regulators was the IPO of VA Linux Systems, which jumped a staggering 698% on its first day of trading in 1999.

The bank, whose allocation methods in its technology group are understood to have been under scrutiny since January, said in a filing with the Securities and Exchange Commission that the inquiries have focused on the IPO of VA Linux Systems. That deal holds the US record for the biggest percentage gain on its first day of listing.