https://www.cnbc.com/2019/04/11/alphabet-uber-investment-stake-has-gone-up-20x-since-2013.html

Six years after making what at the time was its largest venture investment ever, Google's $258 million bet on Uber has multiplied by about 20-fold to be worth more than $5 billion.

According to Uber's IPO prospectus filed on Thursday, Google parent Alphabet owns a 5.2 percent stake in the ride-sharing company. With Uber reportedly looking to go public at a $100 billion valuation, Alphabet's shares are worth about $5.2 billion, though that number could fluctuate wildly between now and the lock-up expiration six months after the IPO.