It's official: Xiaomi Corp. is the world's most valuable technology startup.

The Chinese smartphone maker on Monday confirmed that it has raised $1.1 billion in its latest funding round.

Including the more than $1 billion of capital raised now that the deal has closed, Xiaomi's valuation would be more than $46 billion, according to people familiar with the matter.

That makes Xiaomi the world's most valuable technology startup, putting it above all other startups currently backed by venture capitalists, including Uber Technologies, Inc., the taxi-booking app which earlier this month said a new round of funding valued it at $41 billion. Only Facebook Inc. in 2011 raised capital at a higher valuation from private investors--an investment from Goldman Sachs valued the social network at $50 billion at the time.

Xiaomi's founder Lei Jun made the announcement in a brief posting on his page on the popular Chinese microblogging site, Sina Weibo. Mr. Lei said a range of investors participated in the round, including All-Stars Investment Ltd., DST Global and Singapore sovereign-wealth fund GIC Pte. Ltd.

The Wall Street Journal first reported news of Xiaomi's fundraising earlier this month.

The price tag reflects investors" confidence in Xiaomi's growth potential. Already the largest smartphone maker in China by shipments and the fourth-largest in the world as of the third quarter, Xiaomi has plotted expansion into new geographic markets and new product categories such as smart TVs and air filters.

Xiaomi comprises a web of offshore and Chinese entities. At the top of its corporate structure is Xiaomi Corp., a Cayman Islands-incorporated entity.

Overall, Xiaomi Corp. is profitable and is on track to generate an annual revenue run rate of more than $10 billion by early next year, according to the person familiar with the company.

The company more than quadrupled its valuation since August 2013, when it raised a round of funding at a $10 billion valuation. Before that, DST led an investment valuing Xiaomi at $4 billion in June 2012.

Write to Douglas MacMillan at douglas.macmillan@wsj.com and Rick Carew at rick.carew@gmail.com

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