YouTube generated nearly $5 billion in ad revenue in the last three months, Google revealed today as part of parent company Alphabet’s fourth quarter earnings report. This is the first report under newly instated Alphabet CEO Sundar Pichai, who took over as the chief executive of the entire company late last year after co-founders Larry Page and Sergey Brin stepped back from day-to-day duties.

The announcement marks the first time in YouTube’s nearly 15 years as a Google-owned platform, since Google bought the website in 2006 for $1.65 billion, that the company has revealed how much money YouTube-hosted ads contribute to the search giant’s bottom line. On an annual basis, Google says YouTube generated $15 billion last year and contributed roughly 10 percent to all Google revenue. Those figures make YouTube’s ad business nearly one fifth the size of Facebook’s, and more than six times larger than all of Amazon-owned Twitch.

Overall, Alphabet made $46 billion in revenue in the quarter that ended December 31st, 2019, a 17 percent jump over 2018. Nearly $10.7 billion of that was profit, the company says. Google’s search business remains the big moneymaker of Alphabet’s sprawling empire, earning $27.2 billion for the quarter. But alongside YouTube ad revenue, Google is also disclosing the financial performance of its cloud computing division. Google Cloud made $2.6 billion in revenue for the quarter, the report reveals.

That means Google massively beat Wall Street expectations on profit, but missed on revenue. That could be one reason why Google may be disclosing YouTube and Google Cloud revenues for the first time.

To appease investors, it’s important for Google to remind onlookers that its business isn’t solely dependent on its search engine, and that it has fast-growing and separate businesses like YouTube and its cloud computing division to pick up the slack. That said, a revenue miss of this magnitude for Alphabet means investors were not please, and Alphabet stock is now down more than 4 percent in after-hours trading.

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