The $9.5 billion sale of one of its first clients was among the deals that helped advisory boutique Ondra Partners grow revenues by 50% last year.

The London-based adviser, which was set up by former Lehman Brothers bankers and an ex-HSBC healthcare specialist in 2008, this week filed its accounts for the year to March 31. It reported revenues of £41.8 million, which were up more than 50% year-on-year.