Rights of first refusal are common, but how can Uber prevent a non-employee from selling? I'd love to see the language they use in their options agreements.
I assume that in my wife's case, the company was buying the shares back (privately held firm and we weren't dealing in a secondary market). I guess I'm just surprised Uber doesn't do the same (actually, I'm not, given their C-suite's history of being all-around dicks).
I've never heard of this in the valley, it's standard practice to not allow shares to be traded and provide no option for liquidity until IPO. There can be occasional secondary offerings (Facebook and Square had these) but they are usually a one time deal. Definitely not a concept that Uber invented.
My best understanding of a typical "right of first refusal" clause is that it gives the company the right to match any offer by a third-party buyer.
This would add some friction to the transaction, in that the company could have some specified period to consider the offer, leaving the pending transaction with a third-party buyer in limbo (or discourage the third-party from even considering the transaction). But if the company refuses to buy back the stock at the terms of the third-party offer or the period of time for the company to consider the offer expires, then you could go ahead with the sale to the third-party.
Mind you, when I did do a sale on the secondary market, it always took the full thirty days for the company to approve.