Integral Ad Science (IAS) is a digital advertising verification and measurement company. IAS sits as an independent third-party layer between advertisers and the platforms where they buy ads, confirming that ads are seen by real people, in brand-safe environments, in the correct geography — rather than wasted on bots, hidden placements, or brand-damaging content. IAS serves over 2,000 advertisers across CPG, finance, automotive, and retail, and also serves digital publishers. IAS charges advertisers a CPM fee for the impressions it analyzes, so revenue scales with ad impression volume. IAS organizes revenue into three categories: Optimization (~45% of FY24 revenue), which includes pre-bid and post-bid tools that steer budgets toward higher-quality inventory; Measurement (~40%), which verifies ad quality after an impression is served, with social media the fastest-growing component; and Publisher (~15%), primarily through Publica, a CTV ad server IAS acquired in 2021 to help streaming publishers manage programmatic ad inventory. IAS is embedded directly in major platforms — Meta, YouTube, TikTok, Snap, Pinterest, and Reddit — as an independent verifier, and charges the advertisers running campaigns on those platforms. IAS views pre-bid optimization as roughly 2x the revenue opportunity of post-bid measurement, since pre-bid commands higher CPMs and requires measurement as a prerequisite. IAS's top 100 customers average 8+ years of tenure, and net revenue retention has been above 100%, reflecting consistent upsell as customers adopt additional products and expand to new channels.