Sir Martyn Arbib is one of the UK's wealthiest financiers and a heavyweight donor to the Conservative Party.
He is the founder of fund management company Invesco Perpetual, which he sold in 2001 for more than £1 billion, receiving £113 million in cash and shares worth an estimated £300 million.
As of February 2014 Arbib had donated around £466,330 to the Tories.
The financier owns a 28.7% stake in Circle Holdings, the parent company Circle Health which has landed £1.36billion worth of NHS contracts. This has prompted claims of donor influence, given that several of its investors have gifted about £1.5million to the Tories in recent years: Sir Martyn Arbib's donations represent almost a third of this amount. 
- Son James Arbib, a Cambridge graduate who is a former City of London investment analyst, has made donations to the Green Party and Green MP Caroline Lucas.
- Daughter Annabel Nicoll
- James Lyons, Fury as Tory party donors are handed NHS contracts worth £1.5BILLION under health reforms, Daily Mirror, 8 February 2014, acc 10 Feb 2014