My DH has been given 5% of the company he works for, over the years, these are ordinary 'b' shares. He has been given some others recently that he can sell 50% back to his company in Jan 2011 and the rest in 25% parts at later dates. The company intend to float in the next few years. When is his 5% worth anything? Why is January 2011 significant, is that when they'll float or is the owner just avoiding tax?