You already know that San Jose, California, is the heart of Silicon Valley. And while resident companies like Facebook and Google grab most of the headlines, these startups are growing fast and may well take the spotlight soon. Here are the fastest-growing companies in the land of fast-growing companies.

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10. Draco Broadcast

2018 Inc. 5000 rank No. 1,681 Three-year growth 273% 2017 revenue $9.8M

Known for its high-output and color-free LED video lighting, Draco Broadcast manufactures professional-grade equipment for the video and broadcast industry. It has resellers in 19 states and 28 countries, according to the company.

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9. EQ1 Real Estate

2018 Inc. 5000 rank No. 1,664 Three-year growth277% 2017 revenue $4.2M

This real estate firm's clients are some of the biggest names in tech, including Apple, Facebook, Twitter, Google, and Tesla. Founded in 2013 by Mike Bui, the brokerage uses 3-D virtual reality to walk clients such as foreign investors through properties. 

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8. KeenAlignment

2018 Inc. 5000 rank No. 1,025 Three-year growth 479% 2017 revenue $2.3M

Led by CEO Margaret Graziano, KeenAlignment--which had 28 management consultants in 2017--works with companies to build better hiring, leadership, and cultural practices. Along with San Jose, the firm offers services in Seattle, Denver, Chicago, and Austin. 

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7. Clavax Technologies

2018 Inc. 5000 rank No. 927 Three-year growth 533% 2017 revenue $2.1M

Founded in 2011, the IT company helps clients integrate new technologies such as content management and analytics tools into their workflows. Clavax has additional locations in New York City and Sydney, Australia. 

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6. TapClicks

2018 Inc. 5000 rank No. 821 Three-year growth 615% 2017 revenue $10.3M

TapClicks is a platform that helps manage and track marketing campaigns for more than 3,500 media companies, agencies, brands, and franchises. The company has three other offices in Boston, Nashville, and Montreal.

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5. Tredence

2018 Inc. 5000 rank No. 634 Three-year growth 794% 2017 revenue $12M

Founded in 2012, this Bay Area analytics company makes customized visualizations to helps clients--such as retailers and consumer products makers--further business goals. This is its third consecutive year on the Inc. 5000.

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4. Securly

2018 Inc. 5000 rank No. 519 Three-year growth 969% 2017 revenue $4.2M

This tech company is taking on the challenging education sector with software that helps create a kid-friendlier internet. Its cloud-based web filter sends alerts to parents and counselors about issues such as cyberbullying and self-harm.

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3. Peaxy

2018 Inc. 5000 rank No. 327 Three-year growth 1,506% 2017 revenue $6.3M.

Software company Peaxy uses data to create "digital twins," or digital models of products, for industrial companies that are then analyzed to find cost-efficient insights for clients. In other words, if a product can be made more efficiently, Peaxy will find out. Founded in 2012, the firm also has two European offices, in Italy and in Sweden.

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2. InfoAnalytica

2018 Inc. 5000 rank No. 319 Three-year growth 1,543% 2017 revenue $2.1M

The consulting firm helps companies grow new leads and customer acquisitions. Clients include wealth manager United Capital and eBay. 

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1. DigitalOnUs

2018 Inc. 5000 rank No. 291 Three-year growth 1,670% 2017 revenue $6M

The fastest-growing company in Silicon Valley helps businesses smooth out their go-to-market challenges, which involve everything from product-engineering assessments to growth strategy sessions. The software maker added 118 new employees between 2014 and 2017.