Advertising exchange PubMatic has filed a lawsuit against Google, seeking billions in damages over claims the tech giant has illegally monopolized the ad technology market. The remedy phase of the DOJ’s antirust case against Google over its ad tech monopoly will begin this month.

Bloomberg reports that the lawsuit, filed on Monday in federal court in Virginia, marks the second case brought by an advertising exchange against Google since a federal judge ruled in April that the company illegally monopolized two key ad tech markets. The earlier ruling found Google in violation of antitrust laws in the markets for ad exchanges and publisher ad servers, the tools used by websites to sell digital ad space.

PubMatic, which helps websites like Elon Musk’s X sell advertising inventory, allege

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