Internet-tracking leader comScore is acquiring Seattle-based M:Metrics, which probides measurements of mobile activity.

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M:Metrics, a Seattle company that measures activities in the mobile industry, has been acquired by comScore, one of the top trackers of Internet and digital market share.

Reston, Va.-based comScore paid $44.3 million and issued 50,000 stock options to certain M:Metrics options holders in the deal, which was closed today.

With the acquisition, comScore strengthens its position in measuring mobile phone usage, mobile Internet browsing and related advertising — all fast-growing categories that major technology and media companies are focused on.

Will Hodgman and Seamus McAteer, who cofounded M:Metrics in 2004, are joining comScore management. comScore did not immediately respond to a request for information on the fate of other M:Metrics employees and operations.

In a news release, comScore said it expects the acquisition to “result in substantial operating synergies, cost savings and enhanced revenue growth by building a larger customer base, combining two highly productive sales forces, and leveraging comScore’s global panel and scalable technology infrastructure.”

Benjamin J. Romano: 206-464-2149 or bromano@seattletimes.com