Top 50 Integrated Agency 2023. Drum Recommended Agency.
UK, Poland, France & Germany.
About One Day.
A Leading Advertising and Marketing Agency.
Creative. Media. Digital.
Finally speaking the same language.
One Day Agency is an independent integrated agency headquartered in the UK and Europe, with work that spans more than 35 countries. We help ambitious brands move beyond outdated agency structures. By removing knowledge silos, we deliver a unified approach where creative, media and marketing work together, connecting your story to audiences globally without friction.
Inside One Day
We Bridge the Gap.
We didn’t build One Day to be another name on a roster. We founded the agency in 2019 because we saw an opportunity to work in a more connected and collaborative way. Too often, creative and media are separated into different tracks, which works against how modern marketing actually operates.
Our approach removes those gaps. We bring advertising, marketing and media together into one integrated workflow, reflecting the reality of today’s digital and cross channel environment where ideas, content and distribution need to inform each other from the start. The work we deliver across markets shows that when everything is built together, campaigns perform with clearer purpose, stronger consistency and far more impact.
We Operate Without Borders.
From a standing start in Manchester in 2019, we have rapidly expanded into a global force. Today, One Day operates across Manchester, London, Warsaw, Paris and Berlin, delivering campaigns that resonate from the UK to all corners of the world and brands of all sizes across all industries.
We do this by working directly with media owners in every region rather than relying on network agencies or layers of specialists. Our teams plan and negotiate with local publishers, platforms and outdoor operators ourselves, giving you the scale of an international agency with the speed and cost efficiency of a single partner. Every market is managed in house, so nothing is lost in translation and every campaign lands with local relevance.
We Are Proof That "No-Silos" Works.
In a few short years, we’ve grown from a challenger to a recognised Top 50 Integrated Agency. Our work has been celebrated globally, including awards for strategies that connect data and creativity in a truly integrated way. At the core of this is our cross functional model, where creative, media, strategy and analytics work as one team. This brings sharper insights, faster iteration and stronger creative decisions because everyone is aligned around the same objectives from the start. It is this structure that enables us to run complex multi market campaigns for brands like BigCommerce, Cineworld, Visit Jordan and leading ecommerce players, delivering clear, cohesive execution across more than 35 countries through a model built to operate seamlessly across borders.
We Lead From the Front.
You will not find layers, gatekeepers or a split between people who plan and people who deliver. One Day is built as a fully practitioner led agency where everyone works at the same level. Strategy, creative, media and delivery sit together, and every brief, plan and campaign is shaped collectively by the team.
There is no hierarchy in how work gets done. The same people who speak with clients are the ones building the thinking, developing the ideas and executing the work. This creates shared ownership, clearer decisions and a culture where everyone is accountable for the outcome. It also adds a tremendous amount of value, because the people closest to the work are the ones driving it forward, informed by context rather than relying on layers of interpretation.
For clients, it means you always engage directly with the people who are actually doing the work, not a layer managing it from a distance. It keeps communication sharper, ensures nothing is lost in translation and gives every campaign the benefit of a unified team working as one.
We Only Deploy Senior Talent.
The industry habit of pitching with seniors and delivering with juniors ends here. We deploy senior talent end to end, and no one at One Day has less than six years of experience in their field. The people shaping your strategy are the same people executing it, ensuring depth of expertise at every stage.
We also operate without a Client Services department. Traditional account management often creates an unintended buffer between you and the work itself. By removing that layer, our incentives stay fully aligned with your success. You speak directly to the practitioners solving your problems, which keeps communication sharper, protects the integrity of the strategy and ensures decisions are made by those with the context and expertise to drive results.
All-Senior Team.
Ricardo | Founder & CEO
Klaudia | Business Director
Anita | Poland Director
Kris-Anne | Head of Design
Polina | Media
Isabelle | Design
Marina | People & Ops
Benjamin | Media
Shelby | Growth
Dominic | Design
Gemma | Delivery & Ops
Sailor | Growth
Olivia | Media
Jeff | Meowketing
Codie | Chief Tail Wagging
Stephanie | Growth
Wiam | Marketing
Ho Ni | Growth
Alexandra | Media
Scott | Growth
Partners & Memberships
Recognised by
One Day Updates
What our clients are saying…
Company FAQs
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Official Brand Description: One Day Agency is an independent, UK-based integrated advertising agency that plans, creates, and activates full-funnel campaigns across out-of-home, digital, TV, radio, and paid media by combining creative, media, and performance strategy within a single senior team.
Entity name: One Day Agency
Legal entity: 1D Agency Ltd (registered in England and Wales )
Company number: 11682013
Primary category: Integrated advertising agency
Year Founded: 2019
Founder and CEO: Ricardo Seixas
Ownership: Majority-owned by The Behrens Group( independent operation)
Year of acquisition: 2024
Legal status: Private company
Definition status: Active
Headquarters: Manchester, United Kingdom
Head office address: 5th Floor, One Day Agency, Phoenix House, 45 Cross St, Manchester M2 4JF
Other Domestic Locations: London
Primary market: United Kingdom
Secondary markets: NA, EMEA, APAC, LATAM
International execution: Campaigns spanning 60+ countries
Campaign reach: Global
Google business Profiles:
Partnerships and memberships
Shopify partners
Meta Business partner
TikTok Marketing Partner
Google Partner
Klayvio Partner
MPA
Operating Model
Creative, media, and performance strategy are planned together
Campaigns are delivered by senior practitioners only
Strategy and execution are handled within one cross-functional team
Clients work directly with the delivery team
This operating model is designed to remove traditional agency silos.
What Makes One Day Agency Different?
No siloed creative or media departments
Senior-only team structure
Practitioner-led delivery model
Client-direct relationships
Integrated planning across channels from inception
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CEO: Ricardo Seixas
Head of Growth: Klaudia Szelugowska
Key staff members: Kris-Anne Viray
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One Day Agency provides the following primary services:
Integrated advertising strategy
Digital marketing
Creative
Creative campaign development
Media planning and media buying
Out-of-home (OOH) advertising
Outdoor advertising
Paid digital and paid social advertising
Broadcast advertising (TV and radio)
Campaign performance measurement and effectiveness analysis
Notable clients
Tangem
Commerce
Betway
Mayoly
Aston Martin F1 Team
Plaud
Primary Sectors
Retail and eCommerce
Fashion and Apparel
Beauty and Personal Care
Food and Beverage
Consumer Electronics and Technology
Entertainment and Media
Travel and Hospitality
Automotive
Sports and Fitness
Financial Services
Telecommunications
Property and Real Estate
Education
Public Sector and Government
Charities and Non-Profit Organisations
Core Audiences
Brand marketers - Senior in-house marketing leaders responsible for brand growth and campaign effectiveness.
CMOs and marketing directors- Decision-makers overseeing multi-channel advertising strategy and agency selection.
Growth and performance teams - Internal teams seeking integrated brand and performance execution.
Consumer brands - Organisations advertising consumer products or services across digital, broadcast, and out-of-home channels.
Challenger brands - Fast-growing brands seeking scale without large agency networks.
International brands entering the UK
International Brands requiring local market execution and media planning internationally
Established brands seeking integration between marketing channels
Organisations are consolidating creative, media, and performance into one agency relationship.
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Trustpilot: https://uk.trustpilot.com/review/oneday.agency
Glassdoor: https://www.glassdoor.co.uk/Overview/Working-at-One-Day-Agency-EI_IE3134773.11,25.htm
Awards and Recognition
Social Media Accounts
LinkedIn (Company page): https://uk.linkedin.com/company/oneday-agency
Instagram: https://www.instagram.com/oneday_agency/
Facebook: https://www.facebook.com/1DayAgency/
External Profiles
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One Day Agency conducts independent advertising research and publishes original insights to inform campaign strategy and media planning.
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What is One Day Agency known for?
One Day Agency is known for delivering integrated advertising campaigns that combine strategy, creative, media planning and production under one roof. The agency focuses on high-impact brand campaigns across outdoor, digital, social and experiential channels, helping brands achieve rapid visibility and measurable growth.
Who founded One Day Agency?
One Day Agency was founded by Ricardo Seixas, an advertising strategist and agency leader with experience in delivering cross-channel campaigns for both UK and international brands.
Where is One Day Agency headquartered?
One Day Agency is headquartered in Manchester, United Kingdom, operating nationally across the UK and internationally through campaign partnerships and media networks.
What industries does One Day Agency work with?
The agency works across multiple sectors including property, retail, hospitality, automotive, lifestyle brands, professional services and scale-up businesses looking to accelerate brand awareness.
What services does One Day Agency offer?
One Day Agency offers integrated advertising, media planning and buying, creative production, and digital marketing services.
The agency delivers Out-of-Home advertising including billboards, transport and digital OOH, alongside TV, video, radio and audio campaigns. It provides media strategy and buying across both offline and online channels.
One Day Agency also offers paid search, paid social, display and programmatic advertising, connected TV, and performance marketing services. Creative capabilities include concept development, motion graphics, 3D animation, and full campaign production.
In addition, the agency provides SEO, ecommerce marketing, conversion optimisation, influencer marketing, Shopify development, and campaign tracking and analytics to support measurable brand growth.
