Stock trader looking at charts by Antonio Diaz via iStockDoubleVerify Holdings (DV) is known for helping advertisers verify impressions, measure audiences and ensure their ads appear in quality environments. The global leader in audience measurement, data and analytics has agreed to acquire DoubleVerify in an all-cash deal valued at approximately $2.15 billion, or $13.60 per share. The move comes as advertisers and media companies look for a more unified way to measure audiences across linear and digital media. While Nielsen has traditionally been known for measuring the size and demographics of audiences, DoubleVerify focuses more on the quality and effectiveness of digital advertising. Its solutions assess ad fraud, viewability, brand suitability, audience engagement and media quality across programmatic, social and publisher platforms.