- Facebook floated in May last year valued at $100bn, but its share price fell sharply - blamed partly on Nasdaq technical issues. Shares have since recovered and the company is now valued at more than $120bn.
- LinkedIn shares soared after its 2011 flotation on the New York Stock Exchange, almost doubling its expected valuation to $8.5bn. Today it is worth more than $26bn.
- Lastminute.com shares slumped after floating in 2000. It was bought out five years later for £577m, less than half the flotation price.
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Mr Blavatnik, whose empire includes the Warner Music Group, has an estimated fortune of £13.17bn according to the Sunday Times Rich List.
Find out what to expect from the weather if you are running in the big race in London or watching from the sidelines.
It will be a soggy start to the weekend and temperatures will drop making it feel colder than in recent days.