HgCapital, the mid-market private equity house, has flotated Xyratex, a UK-based data storage provider, on Nasdaq, only nine months after investing £50m in the company.

Xyratex, which was originally scheduled to trade between $15 and $17 a share, was priced at $14-a-share giving it a market capitalisation of just above $400m and valuing HgCapital's stake at $145m.