Kontera, which sells ads linked to keywords on web sites using patented semantic technology that tries to figure out user intent, has closed a $15.5 million round of financing led by Sequoia Capital, with participation from Tenaya Capital and Carmel Ventures.

The San Francisco company previously raised $7 million in 2006 its first round of venture funding.

Founded in 2003, Kontera claims double-digit quarter-on-quarter revenue growth and that it reaches more than 100 million unique users per month on a network featuring 15,000-plus publishers. In May, ComScore said Kontera was the fifth fastest growing internet advertising network, with a 40 percent increase viewers in the prior 12 months.

Kontera has offices in San Francisco, New York, Los Angeles, Detroit, Chicago, Atlanta and Tel Aviv.

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