Three of the top five companies on the GeekWire 200 list of leading Pacific Northwest startups are in Bellevue: OfferUp, Zenoti and iSpot. Other longtime tech companies such as Apptio and Icertis remain in the city.

Bellevue, Wash.-based iSpot.tv helps advertisers measure the brand and business impact of TV and streaming advertising, from concept to airing to conversion.

TV advertising measurement company iSpot.tv appointed Leslie Wood as chief research officer. She will oversee the Seattle startup’s data science department for TV and video measurement products.

iSpot.tvWhat they do: The Seattle-area startup measures the reach and impact of television advertising, helping more than 450 brands measure TV advertising across various viewing formats in real time.

iSpot.tv raised $325 million from Goldman Sachs Asset Management in April, part of the company’s broader effort to loosen industry stalwart Nielsen’s longtime hold on the market for measuring TV ads across broadcast and streaming platforms. The deal gave Goldman Sachs a “significant minority stake” in the Seattle-area company, which was believed to be valued at more than $1 billion at the time.

A decade later, iSpot is a key partner and resource for major media platforms and advertisers. With more than 300 employees, the company has been growing organically and through acquisitions, it’s increasingly becoming an alternative to industry stalwart Nielsen as a standard for audience measurement.