Magnite today announced a significant expansion of artificial intelligence capabilities across both its supply-side platform and SpringServe video technology, introducing a new buyer agent and a suite of AI-assisted mediation features targeting workflow automation in premium CTV and programmatic advertising.

The announcement, made on April 27, 2026, from New York, involves activations with Disney Advertising, Spectrum Reach, Kepler, and MiQ - marking the broadest set of industry partners Magnite has named in a single AI rollout. According to Magnite, the expansion covers two parallel tracks: AI-supported enhancements to the ad mediation layer inside SpringServe for media owners, and agentic tools on the buy side, including the new buyer agent currently entering early tests with Kepler and MiQ.

SpringServe mediation: three new AI-assisted features

The SpringServe changes target publishers managing multiple demand sources across video and CTV inventory. According to the announcement, Magnite is adding three specific AI-supported capabilities to its mediation technology. The first is anomaly detection, designed to flag shifts in auction performance that might otherwise require manual monitoring to identify. The second is demand path optimization, which the company says is intended to improve efficiency in how demand flows through the platform. The third is dynamic pricing, which adjusts to changing market conditions rather than relying on static floor configurations.

Taken together, these tools position SpringServe as a more centralized control point for publishers managing monetization. The ad mediation function - essentially the technology layer that decides how competing demand sources are ranked and activated - has historically required significant manual oversight. Automating anomaly detection means publishers can potentially identify problems faster, while dynamic pricing removes the lag between market movement and pricing response.

FanDuel Sports Network reported a 25% year-over-year increase in total impressions through SpringServe, illustrating the scale at which these mediation tools already operate before the new AI capabilities layer is added.

Spectrum Reach, the advertising sales business of Charter Communications, is named in the announcement as a participant working with both Magnite's AI-enabled mediation and its agentic capabilities. According to Dan Callahan, Senior Vice President and Chief Revenue Officer at Spectrum Reach, "working with Magnite and leveraging both their AI-enabled mediation and agentic capabilities helps us better connect buyers with the premium content and audiences we offer."

The buyer agent and its early testers

The second track in today's announcement is the buyer agent. Kepler and MiQ are launching tests using it, with access to Disney Advertising inventory. According to the press release, the agent is part of a broader push toward agentic AI-driven tools intended to streamline activation, optimization, and performance management.

This is a meaningful step for Magnite operationally. The company ran its first seller agent test inside SpringServe in December 2025, using Scope3 as the buyer agent partner. That test established proof of concept for agent-to-agent CTV advertising, with MiQ also involved on the buy side in that campaign. Today's announcement marks Magnite's first public introduction of its own buyer-side agent, rather than relying on third-party buyer agents to interact with its sell-side infrastructure.

According to Jake Hohlfelder, Director and Head of Programmatic COE at Kepler, "as one of the first partners testing Magnite's buyer agent technology, we're seeing how AI can streamline execution and help us respond more quickly to performance signals." Hohlfelder described the value in terms of speed and adaptability. Kepler, a programmatic consulting and services firm, operates across complex media environments on behalf of large advertisers - which makes the ability to respond quickly to performance signals a practical operational concern rather than a theoretical one.

MiQ's involvement connects to a series of strategic moves the company has made in 2026. MiQ in March 2026 acquired the Latin America business of Adsmovil, creating what the companies described as the largest independent programmatic provider in the region. In April 2026, MiQ acquired Rocket Lab, a mobile app growth company based in Miami. MiQ is also a participant in PubMatic's AgenticOS launched in January 2026 - making it one of the few companies simultaneously testing agentic buying capabilities on multiple independent SSP platforms.

According to Georgiana Haig, Global Strategy and Partnerships Director at MiQ, "Magnite's approach to enabling agent-driven workflows within an open framework aligns well with how we think about building scalable, future-ready solutions for our clients."

Disney Advertising at the center

Disney Advertising occupies a central position in the announcement. Its inventory is the test environment for the Kepler and MiQ buyer agent activations. Disney's relationship with Magnite is long-standing: the two companies extended their partnership in October 2024 for two additional years, with Magnite serving as Disney's preferred supply-side technology partner for programmatic advertising across its media portfolio. That agreement also expanded the relationship into Latin American markets.

Disney Advertising's SVP of Addressable Sales, Jamie Power, is quoted in the announcement describing the work with Kepler, Magnite, and MiQ as "squarely focused on workflow automation - using agent-driven technology to streamline how buyers and sellers operate." Power also cited the objective of removing friction and making transactions easier - language that reflects the operational specificity driving these tests.

Power also appeared in Mediaocean's Prisma Direct announcement in March 2026, where Disney was named as the first media company integration for that platform's direct TV buying automation initiative. The pattern suggests Disney Advertising is actively positioning itself as a testing ground for multiple automation approaches simultaneously.

Publicis Media Exchange joins seller agent development

Beyond the buyer agent tests, Magnite disclosed that it is working with Publicis Media Exchange (PMX) on seller agent-driven workflows. This is framed in the announcement as advancing PMX's ability to analyze supply, generate market insights, and streamline activation. According to Eyal Ebel, Senior Vice President of Platform Partnerships at PMX, "ongoing testing of agentic AI workflows is helping us learn how to better analyze supply, generate meaningful market insights, and streamline activation."

PMX represents one of the largest pools of advertiser spending in programmatic. Its involvement on the seller-agent side - as a buyer-side organization working with Magnite's sell-side agent infrastructure - illustrates the complexity of how agent roles are being defined in practice. The traditional buy-side / sell-side distinction does not map cleanly onto agentic systems, where agents may act on behalf of organizations that sit on either side of a transaction depending on context.

Interoperability as a design principle

Magnite's approach to agentic infrastructure is framed explicitly around interoperability and optionality. According to the announcement, the company intends to develop its own buyer and seller agents while also supporting partners that choose to use third-party agents. This positions Magnite's platform as a connection layer rather than a closed system requiring its own proprietary agent stack.

The interoperability emphasis has been a consistent theme in Magnite's AI communications. When the company ran its December 2025 seller agent test, it worked with Scope3 as the buyer agent - a third-party provider rather than a Magnite-built agent. Scope3 has since undergone two rounds of layoffs as it reorganizes around its agentic advertising platform, but its role in Magnite's early tests remains part of the public record.

The interoperability question has broader stakes than any single company's platform decisions. The IAB Tech Lab released its Agentic RTB Framework version 1.0 in November 2025, establishing technical protocols for how containerized agents participate in real-time bidding infrastructure. Magnite is among the participating organizations in that framework. Without common standards, agent proliferation risks creating new fragmentation rather than simplifying the existing supply chain.

Sean Buckley on the platform vision

Sean Buckley, President of Revenue and Market Strategy at Magnite, provided the broadest statement of intent in the announcement. According to Buckley, "by advancing mediation within SpringServe, we're helping publishers gain clearer visibility into performance, automate optimization, and make more confident decisions about their business." He described the buyer agent work as "streamlining how campaigns are executed and optimized" and characterized both tracks together as expressing "our broader vision to build a more connected, intelligent platform that improves outcomes for both buyers and sellers."

The framing is deliberate. In February 2026, Magnite's Q4 2025 earnings report prompted comparisons with PubMatic, which had made more aggressive claims about agentic AI's transformational potential. PubMatic's CEO Rajeev Goel forecast that 25% of all digital advertising would be executed autonomously via agentic AI by 2028, reaching 50% by 2030. Magnite CEO Michael Barrett took a more measured tone on Magnite's Q4 call, arguing AI agents would "make it work better" rather than disintermediate existing infrastructure. Today's announcement is consistent with that positioning: specific partners, specific features, specific tests - rather than broad projections.

Why this matters for the marketing industry

The announcement lands at a moment when the advertising technology industry is working through a significant transition. The fundamental question is whether AI agents will operate on top of existing programmatic infrastructure or eventually replace significant parts of it. Magnite's bet is the former. By embedding buyer and seller agents into its existing SpringServe and SSP infrastructure, it is positioning itself as the place where agentic campaigns actually execute - not as a platform that gets bypassed by them.

For media buyers, the practical implications of buyer agents are significant. Agents that can respond to performance signals in real time and adjust execution accordingly remove latency from optimization workflows that currently require human review cycles. For publishers, anomaly detection within SpringServe mediation addresses a genuine operational gap: identifying when auction dynamics shift abnormally has historically required either sophisticated manual monitoring or delayed reporting analysis.

Magnite's October 2025 ClearLine evolution had already signaled the direction, unifying curation and activation with plans to integrate AI assistance and agentic workflows drawing on technology from the September 2025 streamr.ai acquisition. Today's announcement brings those plans into a more concrete operational phase, with named partners running actual tests rather than staged technical demonstrations.

Whether the efficiency gains described by Kepler, MiQ, Disney, and Spectrum Reach translate into measurable campaign performance improvements at scale remains to be demonstrated. The tests are early. But the infrastructure direction is clear: Magnite is building a platform where automated agents - both its own and third parties' - can transact, optimize, and manage campaigns within a mediated environment it controls.

Timeline

Summary

Who: Magnite (NASDAQ: MGNI), the largest independent sell-side advertising company, announced the expansion alongside partners Disney Advertising, Spectrum Reach, Kepler, MiQ, and Publicis Media Exchange (PMX).

What: Magnite introduced a new buyer agent entering tests with Kepler and MiQ, alongside three AI-supported SpringServe mediation features - anomaly detection, demand path optimization, and dynamic pricing - designed to give publishers greater automation and control over monetization. PMX is also working with Magnite on seller agent-driven workflows.

When: The announcement was made on April 27, 2026. The buyer agent tests with Kepler and MiQ are launching now, using Disney Advertising inventory. The seller agent work with PMX is described as ongoing testing.

Where: The technologies operate across Magnite's SpringServe video platform and its independent sell-side advertising infrastructure, spanning premium CTV and broader programmatic environments. Magnite is headquartered in New York, with offices across North America, EMEA, LATAM, and APAC.

Why: As programmatic advertising workflows grow more complex - particularly in CTV, where multiple demand sources, real-time bidding, and direct deals must be managed simultaneously - both publishers and buyers face increasing operational overhead. Magnite is positioning AI-assisted mediation and agentic buyer tools as a way to reduce that overhead, respond faster to market signals, and improve campaign outcomes without requiring proportionally larger human operations teams. The move also reflects competitive pressure from PubMatic's AgenticOS and Yahoo DSP's agentic capabilities, both launched in early 2026.

Share this article
The link has been copied!