This article was originally published in The Wall Street Journal.

Ad-tech company MediaMath has raised $225 million from investment firm Searchlight Capital Partners. New York-based MediaMath has raised more than $500 million to date. The latest round values the company at north of $1 billion.

MediaMath operates a demand-side platform, or DSP — technology that lets advertisers and their agencies buy online ads using automated systems — and a data-management platform, or DMP, which lets advertisers store and analyze their data.

You can read the full article here.