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Services like EquityZen can help find buyers for your common shares to offset the tax liability.

Don't you have the option of sell to cover? You basically exercise all of the options, then sell a proportion to cover the taxes?

I was going to say the same thing -- but if your company is not yet public, that might not be easy to do.

Uber doesn't allow secondary sales to 3rd party but will repurchase your shares at their previous fundraising round price.

That's their current policy.

Some banks will give you a loan with the private shares as collateral. However, you may have a margin call on your hands if Uber has a downround.

If you were an early employee, you may have had the option to exercise your options early (while being an employee. Only being able to exercise your options when you leave is a myth -- one that I used to believe myself).

If you were an early employee and the difference is millions of dollars, I would suggest you stay at Uber until you can sell your shares. It's worth it at this point, and you getting a loan to exercise the shares represents a crazy risk.