Usamp, a US-based online market research company, has closed a series D round of financing for $15m from venture capital firm OpenView Venture Partners and investment manager DuPont Capital Management, which invests on behalf of US-based chemical company DuPont’s pension fund.

Usamp has now raised a total of $29.5m, including a series C round of $10.3m in which OpenView Venture Partners participated, a series B round of $3m in 2009, and a series A round of $1.29m in 2008.

Alan Gould, Usamp’s chief executive officer, said: “This financing will be used to accelerate the development of our platform, a powerful new way for marketers to access and evaluate data.”

Adam Marcus, managing director of OpenView Venture Partners, said: “The company’s vision of enabling any marketer to get real-time insights redefines traditional market research. We believe uSamp will lead this evolution.”

Usamp was founded in 2008.

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