Six years after its launch in Manchester, One Day Agency is celebrating a key moment in its journey. The agency started with a simple but ambitious idea: what if creativity, media and performance all worked as one team? No separate departments, no lengthy handovers, just one joined up process from brief to delivery.

That founding vision has since evolved into one of the region’s fastest growing integrated agencies, now building a strong international profile. As One Day marks its sixth birthday, the team is looking back on a year defined by significant growth, major client wins and a clear path into Europe.

An agency with a global ambition

When One Day opened its doors in 2019, its goal was to rethink the traditional agency structure. Instead of splitting creative, media and performance into different teams, the agency brought all disciplines together under one roof, so collaboration could happen from the very start of each project.

This way of working has underpinned the agency’s success. It has enabled One Day to navigate the post pandemic landscape, react quickly to shifts in media behaviour and partner with brands across entertainment, regulated industries and global technology.

The results are clear. By the end of 2025, One Day records 60 percent year on year growth and a stronger, more diverse client portfolio than ever before.

Big wins and growing global reach

Over the past twelve months, One Day has welcomed several high profile brands, including Cineworld Cinemas, Betway and JetBrains. These new partnerships demonstrate the agency’s ability to run integrated, performance focused campaigns across paid social, out of home, TV and international markets.

Each collaboration highlights One Day’s capacity to bring creative thinking, media planning and data insight together in a single, coherent strategy. By removing traditional silos, the agency offers the level of efficiency and impact that brands increasingly require in a fragmented media environment.

Reinforcing the Manchester presence into Europe

Alongside this growth, 2025 has been a crucial year for One Day’s international ambitions. In 2024, the agency entered the Polish market with the opening of a Warsaw office, which now supports campaign delivery for global brands across Europe.

Building on that foundation, One Day is preparing its next major move, reinforcing its presence in France in 2026. The agency is ready to expand its integrated model to the French market and deliver campaigns at global scale.

This represents an important milestone for a Manchester based agency. It proves that ideas born locally, when combined with a global outlook, can succeed on the wider European stage.

The people behind the progress

One Day’s story is not only about impressive growth figures. It is also about the people driving that growth. What began as a founder-led start-up has developed into a multi market agency, with teams now based in Manchester, London and Warsaw. The agency’s speed and momentum are fuelled by a flat structure, strategy led decision making and a culture where collaboration is central.

CEO Ricardo Seixas, whose international background continues to shape the agency’s direction, sums it up:

“We started with a simple idea, creative, media and performance should work as one, not in separate silos. Six years later, that idea is proving to be the foundation for our success. The growth we’ve seen this year, and the brands we’re working with, show that our model works. We’re ready to continue pushing boundaries as we take on new international challenges.”

Wiam El Youbi, Marketing Manager, shares what this milestone means for the team:

“Six years feels like a milestone and a launchpad. What started as a small idea in Manchester has grown into a team running campaigns across continents. Our 60 percent growth this year and the calibre of brands joining us show the strength of our integrated model. We’re excited to keep building on this success as we prepare to expand into France in 2026.”

Looking to the future

With strong momentum and a clearly defined European expansion strategy, One Day is well placed for the next phase of its development. The agency will continue to grow, deepen its relationships with global brands and invest in creative innovation and performance driven media.

As One Day Agency extends its footprint across Europe, it remains rooted in its Manchester origins and committed to its founding ambition: to build a global, integrated agency that consistently delivers work ahead of what the market demands.