SpotX
SpotX, now operating as part of Magnite, was a video advertising and monetization platform that was acquired by Magnite, Inc. in 2021.
Last updated Oct 5, 2026 by the ATDb Editorial Team · Connections updated Oct 12, 2026
AI-drafted from public sources22 sources cited
At a glance
- Employees
- 501-1000
- Funding
- $100M+
- Revenue
- $100M-$250M
- Stock
- NASDAQ:MGNI
About
Was one of the largest independent video-focused SSPs globally before being absorbed into Magnite, the largest independent sell-side advertising platform
SpotX, now operating as part of Magnite, was a video advertising and monetization platform that was acquired by Magnite, Inc. in 2021. It served premium publishers with holistic yield management tools — including programmatic technology, a modern ad server, and private marketplace capabilities — designed to maximize revenue across desktop, mobile, and connected TV inventory while giving publishers greater transparency and control over advertiser buying behavior. Publishers used SpotX to consolidate all of their demand sources — including ad networks, DSPs, trading desks, and exchanges — into a single platform where media owners could manage inventory and maximize revenue. SpotX was sold to Magnite for a purchase price consisting of $560 million in cash and 14.0 million shares of Magnite stock, implying an enterprise value of $1.17 billion. Source 1: wikipedia.org — SpotX Source 2: hig.com — SpotX - H.I.G. Capital Portfolio Company Source 3: stevieawards.com — Serving All Your Video Ad Needs with SpotX Source 4: bertelsmann.com — RTL Group Sells Its US Ad-Tech Company SpotX
Business model
Marketplace
Target market
Enterprise
What they offer
Video SSP
Core supply-side platform enabling publishers to manage, sell, and optimize video ad inventory programmatically across all screens
CTV/OTT Monetization
Specialized tools for connected TV and over-the-top streaming publishers to monetize content with premium programmatic demand
Private Marketplace (PMP)
Deal management tools allowing publishers to create curated, premium inventory packages for direct buyer relationships
Audience Data Platform
First- and third-party data integration capabilities to enhance targeting and yield for video inventory
Ad Quality & Brand Safety
Tools to ensure brand-safe environments and filter invalid traffic across video supply
Key features
Use cases
Customer segments
Tech & specs
Technology stack
Security & compliance
Deployment
API
Yes
- 2007 · Founded