(NYSE: UBER) gave investors a lot to cheer about when it reported its fourth-quarter financials. Revenue increased 15% year over year to $9.9 billion, while the company generated $1.4 billion in net income during those three months. Both of these headline figures crushed Wall Street consensus analyst estimates.

In the last 12 months, shares of Uber have soared 102% (as of Feb. 12). And they recently hit a fresh all-time high.

Before you rush to buy this transportation-as-a-service stock in the hope of riding the momentum to strong returns, take the time to understand what might be Uber's biggest risk. Let's take a closer look at the ride-hailing and delivery business.

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Source Fool.com