London’s 101 Fastest Growing Advertising Startups

At Best Startup London we track over 100,000 London based startups and over 500,000 people who hold key positions in these companies. We use this directory of startups to highlight top employees, founders and organisations we think deserve more appreciation than they are currently getting.

We’ve ranked the top 101 Advertising companies in London. The companies, startups and institutions listed in this article are all exceptional companies, well worth a follow. We have included links to their websites, socials and CrunchBase (if you’re interested in their financials).

We selected the organisations listed in this article based on:

• Track record
• Executive leadership
• Market share
• Innovation
• ESG rating

Our Data – We source our data from OSINT (open source intelligence) and public directories such as Crunchbase, SemRush and many more. The data from these sources should be treated with a degree of caution and verified yourself.

Top Advertising Companies & Startups (London)

Good-Loop

Good-Loop converts advertising money into charitable donations – whilst delivering 70% higher engagement for the advertiser. Win-win : )

S4 Capital

S4Capital is a digital advertising and marketing services company.

Whalar

Whalar is an influencer marketing platform focused on creators with influence.

Brainlabs

Brainlabs is a data-led marketing agency, helping businesses build experimentation-led marketing through display, CRO and analytics.

dunnhumby

dunnhumby is a U.K.-based company that helps retailers and brands analyze data in order to improve customer experiences and build loyalties.

Bettor Publishing

A digital media company for people who bet on sports and the brands that want to reach them

Blis

Blis is the leading privacy-first, location-powered programmatic advertising partner.

Realeyes

Measuring Human Response At The Speed & Scale Of AI

ID5

ID5 is an independent shared identity infrastructure for ad tech platforms and premium publishers

Zephr

Zephr is a technology platform for media companies to grow their subscription revenue.

Captify

Captify offers a search retargeting service that enables advertisers to focus on users to match their desired audience with inventory.

AD

Media Agency

Mirriad

Mirriad’s patented, AI and computer vision technology dynamically inserts products and innovative signage formats after content is produced.

WPP

WPP creates transformative ideas and outcomes for its clients through an integrated offer of communications, commerce, and technology.

Ad-Lib.io

Powering Creative Effectiveness

Poplar Studio

Poplar is a creative platform that enables brands and retailers to produce 3D and AR experiences on-demand, powered by a talent cloud.

OnePulse

OnePulse is a mobile app that connects people and businesses with opinions and reward them through PayPal.

Uhive

Uhive is a social network that lets users socialize, interact, and find people across the world while earning its own digital currency.

Fetch

Fetch, part of Dentsu Aegis Network, is a global mobile-first agency.

Threedium

We create memorable brand experiences, drive product considerations and deliver conversions through 3D/AR Technology.

AudioMob

Monetizing mobile games non-intrusively using audio ads! AudioMob are the creators of Audio Enhanced Banners & Rewarded Audio

Permutive

Permutive is an audience platform for advertisers and publishers to plan, build, and activate cohorts while keeping everyone’s data safe.

UENI

UENI is a London based tech company that’s empowering businesses to get online and find the tools they need to succeed.

Adludio

Adludio is a next generation mobile advertising platform to create, distribute, and optimise campaigns.

Ve Global

Ve Global a marketing technology business.

Skimlinks

Skimlinks is the leading commerce content monetization platform, supporting publishers’ creation of a new revenue stream.

Takumi

Takumi is a platform that gives large brands and advertising agencies access to branded influencer creative at scale.

FIXR

FIXR is a leading ticketing and event management platform built for fans and organisers.

Odore

We bring digital and data to sampling, providing data driven sampling solutions so brands get to know their customers better.

ID Ward

ID Ward is a SaaS platform that enables marketers to reach audiences in a private way using decentralised, zero-party data.

Livity

Livity, a multi disciplined youth marketing agency.

Base79

Base79 is an online media company creating global audiences for video content and manages hundreds of YouTube channels.

KidsKnowBest

A full-service creative agency; driven by insights; powered by youth. Delivering effective and results-led solutions.

Luna Labs

Luna Labs is a startup that’s built a platform allowing app developers to create and manage video and playable ads.

Bidvine

Bidvine make hiring local, trusted service professionals ridiculously simple – and help people use the time saved to pursue their passions.

Codec

We help brands to discover and tap in to the pockets of culture that drive growth. Powered by award-winning AI.

LAB

LAB is a digital agency that offers a full suite of digital services.

Nozzle.ai

Nozzle.ai is an eCommerce and advertising optimization platform for Amazon.

Coniq

Coniq is the Total Customer Engagement Company.

Kindred

Kindred is an impact driven tech company that has developed the world’s first sustainable app monetization network.

Zone

Zone is a digital agency. A Tech Track 100 company, we help great brands thrive in a digital world.

Tailify

Tailify provides a one-stop-shop for Influencers & Brands by offering high technological solutions.

Minute Media

Minute Media is a media and technology brand focused on two main pillars—platform and content.

Blippar

Blippar is a technology company specializing in augmented reality, artificial intelligence and computer vision.

Social Chain

Social Chain a social media marketing agency.

Unlockd

Unlockd is a mobile platform that rewards consumers when they unlock their digital device and view targeted ads, content or offers

Ernstaa

Ernstaa provides digital marketing and IT services.

Affectv

Affectv is an advertising technology company that runs media campaigns for global brands.

Duel

Brand Advocacy Platform that enables purpose-led brands to drive organic growth & retention through word-of-mouth & advocacy

MSQ Partners

MSQ Partners is a joined-up community of agencies, helping businesses build High EQ brands.

NumberEight

On-device AI software to predict user context using mobile sensors

Realife Tech

Realife Tech is an experience automation platform that provides customized communication channels for event guests.

Adbrain

Adbrain powers marketers and their partners to understand and engage with their customers 1:1 across devices, channels and platforms.

Contact

Contact is the place where creatives manage their career and get paid.

Supponor

Supponor transforms real world mass-audience TV visible signage into highly targeted virtual brand messaging in sports broadcasting.

Dianomi

Dianomi is a global leader in content marketing.

Convertr

Convertr is an API-first data optimization platform that acts as a firewall. We protect companies against expensive, bloated databases.

Fanvue

Fanvue, an all-new platform aiming to shape the future of content monetisation.

Four Communications

Four is a leading independent, integrated communications agency with offices in London and the Gulf.

KF Beauty

We identify, develop and market innovative products in the Health & Beauty sector.


TVbeat

TVbeat is a real time cross-device TV analytics platform that connects data from existing digital, cable, satellite, or IPTV networks.

Wooshii

The Video Production Marketplace

Four Communications

Four is a leading independent, integrated communications agency with offices in London and the Gulf.

Illuma

Leading the way in contextual scaling for online advertising campaigns. Privacy friendly, without using cookies or personal data.

KF Beauty

We identify, develop and market innovative products in the Health & Beauty sector.


Auddy

Podcast publishing solutions for both enterprises and consumer

Lobster

Lobster is a platform which enables brands, agencies and the media to licence visual content directly from social media users.

Kin

Kin is an app that provides family members with secure personal media.

Appsumer

Appsumer automates user acquisition & performance marketing dashboards, reports & insights

more2

We believe to be great, you have to be single-minded in your focus. Our focus is on growing retail businesses.

The Engine Group

A creative community that provides clients with best-in-class communications expertise under one roof.

Qubit

Qubit specializes in personalization at scale for e-commerce companies.

M&C Saatchi

M&C Saatchi Group is a creative company that connects specialist expertise, fuelled by data and technology.

HH Global

HH Global is the trusted marketing execution partner of the world’s leading brands.

Abacus e-Media

Abacus e-Media provides digital expertise for media and the public sector to design and build websites.

A Million Ads

A Million Ads provides dynamic audio advertising for users of digital radio and streaming services.

FanCircles

Reach followers and fans through your own fan club platform built for music artists, YouTubers, television shows and celebrities

Smartzer

Smartzer makes videos and live streams interactive & shoppable on e-commerce, video ads and social.

Pixoneye

Pixoneye is a data analytics SaaS company.

Avocarrot

Avocarrot is the leading programmatic native ad exchange for mobile publishers.

Adnow

Adnow is a high-end advertising firm that works with RTB, big data and AI to serve the most relevant and interesting ads.

InPlayer

InPlayer is a video and digital asset monetization platform.

Commanders Act

Online marketing solutions and advertising efficiency and performance are then improved.

Sliide

Mobile technology company that work with MNO, MVNO and OEM partners globally to increase engagement, drive revenue, and decrease churn.

Monterosa Productions

Monterosa is the global leader in audience interaction technology and commerce

TLC Marketing

TLC Marketing is a rewards company that turns brand positioning into experience-led promotions.

Viral Loops

The all-in-one viral marketing platform to launch your referral programs, sweepstakes, competitions and pre-launch campaigns.

AdTonos

Creating innovative technologies for voice commerce, enabling voice transactions. Bringing the power like Adwords has to audio advertising.

GlobalReach Technology Ltd

The most complete, scalable Wi-Fi authentication and provisioning platform.

Exit Bee

Re-imagine display advertising.

Maison Sport

Maison Sport is a marketplace connecting ski instructors with people learning to ski

Scoota

A single programmatic platform that enables advertisers to create, activate, measure and optimise brilliant brand campaigns at scale.

Gener8 Ads

Gener8 enables people to control and earn from their own data.

SuperAwesome

SuperAwesome offers kid-safe tools and technology for the children’s digital media ecosystem.

Buzzbike

Buzzbike is launching a tech-driven cycle scheme for London, creating a new sponsorship platform for brands.

Ksubaka

We provide powerful immersive brand experience & data platform which allows brands & retailers to link offline customers to online profiles

Smartology

Digital advertising technology company

Bagboard

Bagboard is an advertising platform that creates premium, eco-friendly, and reusable bags to replace single-use plastic ones.

Trackonomics

Trackonomics is a technology that provides publishers with the arsenal to capitalize on their affiliate links.

Squawka

Squawka is a digital media company focused on using stats & data viz to fuel content for fans

Sine Wave Entertainment Ltd

Sine Wave Entertainment is a virtual space for MMO developers and creators to interact with each other.