PubX

What PubX does

PubX is a London-headquartered PubTech company that operates an agentic AI marketplace connecting digital publishers with advertisers through autonomous AI-to-AI negotiation. Its core product layer is dynamic floor pricing, which sets a unique price for each programmatic ad auction based on real-time bid-stream intelligence built from more than five years of ML training data covering over 5 trillion lifetime auctions and 400+ billion auctions annually across 10,000+ premium publisher integrations. The platform consists of two interlocking sides: publisher-side tools (pubX Bid Intelligence, Sales Agents, First-Party Data Monetization, and the pubX Bid Adapter for Prebid.js header bidding) and advertiser-side Buying Agents that autonomously evaluate campaign briefs and negotiate inventory access. Technology integrations include a no-code path through Magnite's Control Centre, Prebid.js bid adapters, and Google Ad Manager key values, with platform-agnostic DSP connectors for the buy side.

PubX monetizes through a revenue-share model on the CPM uplift its dynamic floor pricing delivers versus publishers' baselines, augmented by transaction fees on agentic marketplace deals and first-party data monetization for premium audience signals. Pricing is quote-based with multi-year contracts rather than public list pricing, and the go-to-market is enterprise field sales complemented by heavy event sponsorship (Programmatic Pioneers Summit 2026, POSSIBLE 2026, DMEXCO 2024) and content-led thought leadership under the PubTech and agentic advertising banners. The company is privately held and operated as Pubx AI Ltd, founded in 2020 by Andrew Mole (CEO) and Alex Rosen (CTO), who previously built and exited the ML-powered DSP Platform360. The firm is seed-funded by Concept Ventures, Haatch, Force Over Mass Capital and Redbus Ventures, employs roughly 25 people fully remotely across the UK, US and India, and reports being profitable in its core product.

Name

PubX

Legal name

Pubx AI Ltd

Website

https://pubx.ai

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

11–50 employees

Short description

PubX operates an agentic AI marketplace for programmatic advertising, using dynamic floor pricing and autonomous buying and selling agents to help digital publishers increase CPMs and monetize first-party data while giving advertisers premium inventory access.

Ownership category

akta.pro rank

Product category

Programmatic Advertising Technology

NAICS

Media Buying Agencies (54183), Software Publishers (5132)

SIC

Services-Advertising (7310), Services-Prepackaged Software (7372)

akta.pro primary industry

Paid Social Advertising (BPAFACAB)

akta.pro secondary industries

Auction & Primary Issuance Platforms (IPO/Follow-on/Bond Auctions) (FSAFANAI), Algorithmic Trading & Execution Platforms (FSAFANAN)

Keywords

• Programmatic advertising platform
• Dynamic floor pricing
• Agentic advertising marketplace
• Publisher yield optimization
• Header bidding technology

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Infrastructure, Operations

Revenue model

1. Publisher Dynamic Floor Pricing: Revenue generated from pricing programmatic auctions for publishers using AI-powered dynamic floor pricing technology. The platform takes a share of the revenue uplift generated for publishers compared to baseline pricing.
2. Agentic Deal Creation: Revenue from creating and facilitating exclusive programmatic deals between publishers and advertisers through the agentic marketplace. Deals are created through AI-to-AI negotiation with publishers approving every deal before activation.
3. First-Party Data Monetization: Revenue from enabling publishers to transact first-party data at premium rates with advertisers who value quality signals. Sales agents negotiate deals that reflect the true worth of audience insights.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

PubX runs an agentic advertising marketplace that connects digital publishers with advertisers through AI-powered buying and selling agents that negotiate programmatic deals in real time. Its core publisher offering is Dynamic Floor Pricing, which sets a unique AI-derived price for each ad auction, complemented by pubX Bid Intelligence for bid-stream analytics, Sales Agents, and First-Party Data Monetization. For advertisers and agencies, the platform exposes autonomous Buying Agents that evaluate inventory against campaign briefs, build custom segments, and activate campaigns through DSP integration.

Product overview

PubX operates as a modular publisher technology platform organized around its Agentic Advertising Marketplace as the core product. The platform consists of two interconnected sides: Publisher Solutions (pubX Bid Intelligence, Dynamic Floor Pricing, First-Party Data Monetization, Sales Agents) and Advertiser Solutions (Buying Agents). The pubX Bid Adapter enables Prebid.js integration for publishers. Supporting infrastructure includes pubX Bookmarklets for AdOps debugging. The platform is built on 5+ years of machine learning technology that has priced over 5 trillion programmatic auctions, with Bid Intelligence transforming ML output into measurable revenue. Both publishers and advertisers access the agentic marketplace where AI agents negotiate directly to create exclusive deals.

Differentiator

Problem solved

Functional benefit

Products and services

• Agentic Advertising Marketplace First end-to-end agentic advertising marketplace where AI-powered buying agents and selling agents negotiate directly in real time, creating exclusive deals that traditional programmatic infrastructure cannot deliver. Publishers retain approval control over every deal before activation.
• Dynamic Floor Pricing AI-powered dynamic floor pricing that sets a unique price for each ad auction in real time, maximizing revenue efficiency of publishers' full stack based on auction context and bid-stream intelligence.
• pubX Bid Intelligence Transforms machine learning output into measurable publisher revenue by analyzing bid-stream data and historical patterns to arrange optimal deals in near real time, maximizing yield across programmatic auctions.
• pubX Sales Agents AI-powered sell-side agents that analyze publisher inventory, audience data, and first-party signals to identify high-value opportunities, negotiating directly with buying agents to create exclusive deals that maximize CPMs and fill rates.
• pubX Buying Agents

Quantifiable outcome

• Positive revenue uplift across publisher portfolios
• +2 more outcomes

Named customers1 record

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

AI capability4 records

Feature6 records

Partnerships

Five partnerships are on record, tiered core and minor.

• MagnitecoreTechnology or IntegrationIntegration partnership for publisher onboarding. Publishers integrate via Magnite's Control Centre for no-code setup with no new contracts required. This enables seamless activation of pubX's agentic marketplace and sales agents for publishers already using Magnite's SSP.
• Adtech Chat CommunityminorGTM or Marketing PartnerpubX is sponsoring the Adtech Publisher Chat, part of Adtech Chat Community's portfolio of vertical groups for senior operator-led discussion. Supports independent dialogue on programmatic, signal loss, and AI-driven yield optimization.
• POSSIBLE 2026coreGTM or Marketing PartnerpubX is a proud partner of POSSIBLE 2026, taking place April 27-29 at Fontainebleau Miami Beach. The event brings together marketing leaders shaping the future of marketing, media, and technology. pubX has a Startup Unit in Innovation Village.
• Programmatic Pioneers Summit 2026coreGTM or Marketing PartnerpubX is sponsoring Programmatic Pioneers Summit 2026 (June 2-3, Royal Lancaster London). 600+ programmatic leaders attending. MD Commercial EMEA Lawrence Horne hosting panel on 'After the Middlemen' about agentic buying and Unified Ad Platform.
• AgenticAdvertising.orgcoreStrategic or Co-development PartnerpubX is a founding member of AgenticAdvertising.org, building the next generation of autonomous advertising infrastructure. This positions pubX as a thought leader in the agentic advertising category.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Magnite: Largest independent SSP and PubX's primary integration partner; operates in the same programmatic header-bidding and seller-side optimization space and offers competing yield and floor-pricing tools to publishers.
• Pubmatic: Independent sell-side ad platform with header bidding, dynamic floor pricing, and supply-path optimization capabilities that directly overlap with PubX's publisher monetization offering.
• Index Exchange: Global ad exchange and SSP that competes for publisher programmatic revenue and has invested in AI-driven auction optimization similar to PubX's dynamic floor pricing.
• OpenX: Global SSP and ad exchange with header bidding and yield-management products that overlap with PubX's publisher floor-pricing and agentic marketplace proposition.
• Sonobi: SSP focused on publisher direct deals and header bidding with proprietary auction technology; a comparable sell-side programmatic competitor for premium publisher inventory.

Broad incumbents

• Google Ad Manager: Dominant publisher ad server and SSP owned by Google; competes indirectly with PubX via its own auction dynamics, floor controls, and integrations into the broader Google programmatic stack.
• The Trade Desk: Leading independent DSP that PubX's advertiser-side buying agents must interoperate with and ultimately compete against as agentic buying becomes more prevalent in DSPs.

Emerging players

• Kevel: Ad-server-as-API platform offering custom auction and floor-pricing infrastructure to publishers and retailers, conceptually adjacent to PubX's programmatic yield technology.
• Yieldmo: Programmatic ad platform investing in AI-driven optimization and cookieless targeting, competing for the same publisher yield and advertiser outcomes as PubX.

Others

• Prebid.org: Open-source header bidding organization and ecosystem in which PubX is a top-five analytics adapter; not a commercial competitor but a foundational platform shaping PubX's distribution surface.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/pubx
• Facebookfacebook.com/profile.php

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds3 records

Investors4 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about PubX