Fenestra
Fenestra is a London-based B2B SaaS company, founded in 2017, that sells an AI-powered biddable-media optimization platform (Actus™ and ChatFST™) using custom LLMs and Agentic AI to enterprise advertisers and agencies managing multi-platform paid campaigns.
- Company typePrivate
- Founded2017
- HeadquartersLondon, United Kingdom
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
What Fenestra does
Fenestra (Fenestra Holdings Ltd) is a London-based B2B SaaS company founded in 2017 that sells an AI-powered advertising performance optimization platform to biddable media teams. Its core product, Actus™, integrates custom-built large language models and Agentic AI with ad tech expertise to automate bid optimization, multi-platform data collection and normalization, and reporting across demand-side platforms (DV360, Google Ads, Meta, Amazon Ads, Adform, Xandr, Yahoo), ad servers (Google Ad Manager, Google Campaign Manager, Freewheel), exchanges (Index Exchange, Sharethrough, Taboola, Teads), verification (IAS, Moat, Adloox), and sustainability/sports data providers (Scope 3, Sportradar, Genius Sports). A complementary conversational interface, ChatFST™, exposes post-campaign analysis (PCA) via natural-language queries and is positioned as delivering "100 years of programmatic expertise" on demand.
The platform's stated outcomes include up to 52% campaign-performance uplift, 30% reduction in manual processes, real-time Supply Path Optimization, and PCA returned within seconds. Revenue is generated through a subscription SaaS model sold via quote-based enterprise field sales (contact form and "Get Started Today" CTAs) plus self-serve access through bay.fenestra.io; no public pricing tiers are disclosed. Fenestra's named advertiser roster includes Volvo, Shell, GSK, T-Mobile, SiriusXM, Unibet, Betway, Lidl, PUIG, Amica, SFR, Strongbow, and gov.scot, alongside agencies Hearts & Science and Epitaph Group. The company operates from 71-75 Shelton Street, London, is led by founder/CEO Ashley MacKenzie, CFO/co-founder Kevin Deeley, and CTO/Chief Data Scientist Dan de Sybel, runs with 11–50 employees, has raised $1.5M in a single disclosed funding round (February 2018), and reports no parent company, subsidiaries, or institutional PE/VC backing in the available sources.
Fenestra firmographics
Firmographics- Name
- Fenestra
- Legal name
- Fenestra Holdings Ltd
- Website
- https://fenestra.io
- Company type
- Private
- Founded year
- 2017
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Fenestra is a London-based B2B SaaS company, founded in 2017, that sells an AI-powered biddable-media optimization platform (Actus™ and ChatFST™) using custom LLMs and Agentic AI to enterprise advertisers and agencies managing multi-platform paid campaigns.
- Ownership category
- akta.pro rank
Fenestra industry classification
Industry- Product category
- Programmatic Advertising Optimization Software
- NAICS
- Other Services Related to Advertising (541890)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- Performance Marketing Automation & Bid Management Services (MPAAACAM)
- akta.pro secondary industries
- Programmatic Media Buying & Trading Desks (DV360/TTD, RTB) (MPAAABAB), Programmatic Display & Video (DSP/RTB) (BPAFACAC)
Keywords
Where Fenestra is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
Fenestra business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure
Revenue model
- SaaS Platform Subscription: B2B SaaS platform providing advertising performance optimization through AI-powered tools. The platform is accessed via bay.fenestra.io, indicating a subscription-based model with clients accessing the Actus™ and ChatFST™ tools.
Go-to-market motion1 record
Distribution channels2 records
Marketing channels3 records
Fenestra product offering
Product offeringCore offering
Fenestra sells a B2B SaaS platform that helps advertisers and agencies manage, optimize and analyze programmatic (biddable) media campaigns. Its core offering, Actus™, ingests real-time and historical data from multiple ad-buying platforms, applies custom-built large language models and Agentic AI, and surfaces optimization strategies that the company says can lift campaign performance by up to 52% and cut manual work by 30%. ChatFST™ is a conversational layer that delivers post-campaign analysis in seconds, and the platform automates report generation, bid optimization and supply path optimization across integrations with DV360, Google Ads, Meta, Amazon Ads, Adobe and others.
Product overview
Fenestra offers a unified advertising intelligence platform built around its core product, Actus™. The platform integrates custom-built large language models and Agentic AI to automate bid optimization, data consolidation, and reporting for biddable media teams. ChatFST™ serves as a conversational layer providing instant post-campaign analysis. The platform automates data collection, normalization, and cleaning from multi-platform sources, reduces manual processes by 30%, and delivers up to 52% improvement in campaign performance.
Differentiator
Problem solved
Functional benefit
Brands
- Actus™: AI-powered platform that analyses real-time and historical data to reveal hidden advertising opportunities and boost campaign performance by up to 52%.
- ChatFST™
Products and services
- Actus™ Fenestra's flagship analytics platform that continuously analyzes real-time and historical advertising data from multiple platforms, reveals hidden opportunities, and offers strategies to lift campaign performance by up to 52%. It is aimed at Biddable Media teams at enterprises and agencies managing paid digital campaigns.
- ChatFST™ Conversational AI-powered tool that provides comprehensive post-campaign analysis (PCA) within seconds, offering on-demand access to roughly 100 years of programmatic expertise through best-in-class dashboards, targeted at Biddable Media teams needing rapid decision-making.
Quantifiable outcome
- Boosts advertising performance by up to 10X
- +3 more outcomes
Companies that use Fenestra
Customer profileNamed customers15 records
Segments1 record
Ideal customer profiles1 record
Fenestra technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration22 records
AI capability7 records
Feature4 records
Fenestra partnerships and signals
Strategic signalPartnerships
23 partnerships are on record, tiered core.
- AdformcoreData partner in the Paid Media ecosystem, providing programmatic advertising infrastructure integration.
- MetacoreData partner providing advertising platform integration for campaign management and analytics.
- AdobecoreData partner providing advertising and analytics platform integration.
- Amazon AdscoreData partner providing integration with Amazon advertising platform.
- DV360 (Display & Video 360)coreData partner providing integration with Google's DV360 programmatic platform.
- Google AdscoreData partner providing integration with Google Ads platform for campaign optimisation.
- Google Ad ManagercoreData partner providing integration with Google's ad server platform.
- Google Campaign ManagercoreData partner providing integration with Google's campaign management platform.
- FreewheelcoreData partner providing programmatic video advertising integration.
- Index ExchangecoreData partner providing programmatic advertising exchange integration.
- XandrcoreData partner providing programmatic advertising platform integration (now part of Microsoft).
- YahoocoreData partner providing advertising platform integration.
- EmitriqcoreData partner in the Paid Media ecosystem.
- Genius SportscoreData partner providing sports data and advertising integration.
- HawkcoreData partner providing programmatic advertising solutions.
- IAS (Integral Ad Science)coreData partner providing ad verification and brand safety integration.
- MoatcoreData partner providing ad measurement and viewability solutions.
- Scope 3coreData partner providing sustainability measurement for advertising.
- SharethroughcoreData partner providing native advertising exchange integration.
- SportradarcoreData partner providing sports advertising data integration.
- TaboolacoreData partner providing content recommendation platform integration.
- TeadscoreData partner providing digital advertising platform integration.
- AdlooxcoreData partner providing ad verification and brand safety solutions.
Scale indicators4 records
Recent moves6 records
Expansion highlights4 records
Fenestra competitors and assessment
Company assessmentDirect peers
- The Trade Desk: Independent programmatic DSP providing AI-driven bid optimization, supply path optimization, and cross-channel campaign management — directly overlaps Fenestra's Actus™ value proposition for biddable media buyers.
- Skai (formerly Kenshoo): AI-powered digital advertising activation and optimization platform across Google, Meta, Amazon, and programmatic — competes head-on with Fenestra's bid optimization and analytics for biddable media teams.
- Marin Software: Cross-channel bid management and campaign optimization SaaS for paid search and programmatic, addressing the same biddable media pain points Fenestra targets.
- Optmyzr: PPC and bid management automation platform offering AI-driven optimization, reporting, and SPO — directly comparable to Actus™'s bid optimization capabilities.
- Pacvue: Commerce media optimization platform for Amazon, Walmart, and programmatic — overlaps Fenestra's automated bid management and analytics for performance advertisers.
Broad incumbents
- MediaMath: Established programmatic DSP and terminal-one stack offering bid optimization and audience targeting — a broader incumbent whose SPO and optimization features overlap Fenestra's offering.
- DoubleVerify: Ad measurement and analytics platform providing verification, viewability, and brand safety — adjacent to Fenestra's analytics layer and a current data partner via Moat.
- AdRoll: Multi-channel ad platform offering programmatic display, retargeting, and AI-driven bid optimization for SMB and mid-market — broader portfolio but overlapping AI optimization value.
Emerging players
- Celtra: Creative automation and analytics platform for digital advertising — adjacent to Fenestra's analytics and optimization focus with comparable agency/brand customer base.
- Tatari: Analytics-driven TV and programmatic advertising platform using AI for campaign optimization and measurement — comparable mid-stage competitor bringing AI-led optimization to biddable media buyers.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
Fenestra social profiles
Digital presenceFenestra financial estimates
Financial estimateRevenue estimate
Valuation estimate
Fenestra leadership team
Management profileNumber of profiles
Profiles3 records
Fenestra funding detail
Funding detailFunding overview
Funding rounds1 record
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Fenestra M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Fenestra
What does Fenestra do?
Fenestra sells a B2B SaaS platform that helps advertisers and agencies manage, optimize and analyze programmatic (biddable) media campaigns. Its core offering, Actus™, ingests real-time and historical data from multiple ad-buying platforms, applies custom-built large language models and Agentic AI, and surfaces optimization strategies that the company says can lift campaign performance by up to 52% and cut manual work by 30%. ChatFST™ is a conversational layer that delivers post-campaign analysis in seconds, and the platform automates report generation, bid optimization and supply path optimization across integrations with DV360, Google Ads, Meta, Amazon Ads, Adobe and others.
Is Fenestra a public or private company?
Fenestra is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Fenestra founded?
Fenestra was founded in 2017. It employs 1 to 10 people.
Where is Fenestra based?
Fenestra is headquartered in London, United Kingdom, in the Europe region.
How does Fenestra make money?
One revenue line is on record: saaS Platform Subscription.
Who are Fenestra's main competitors?
Direct peers on record are The Trade Desk, Skai (formerly Kenshoo), Marin Software, Optmyzr and Pacvue. Broad incumbents are MediaMath, DoubleVerify and AdRoll. Emerging players are Celtra and Tatari.
Does Fenestra have an API?
No public API is recorded for Fenestra.
What industry is Fenestra in?
Fenestra's product category is Programmatic Advertising Optimization Software. Its primary akta.pro industry code is MPAAACAM, Performance Marketing Automation & Bid Management Services, with a secondary code of MPAAABAB, Programmatic Media Buying & Trading Desks (DV360/TTD, RTB). Its NAICS code is 541890 and its SIC code is 7372.