We’re taking mobile engagement further

For over two decades, we’ve been innovating new and exciting ways of boosting mobile engagement and acquisitions for our ambitious customers across the world.

Our Story

Built to surpass

Many companies in our industry are come and go—they stake their claim on the digital frontier when their strategy is relevant and then disappear. The good ones are built to last, and are leading the way in digital marketing campaigns and customer desires at any given time. We reinvent the market and ourselves, surpassing what is standard.

Our people are some of the best in their field—agile, innovative, full of fresh ideas, and thriving within an ever-changing tech environment. Our platform delivers foolproof, targeted, automated campaigns that drive hyper-focused results with authentic outcomes. No fraud. No number pumping. Just real customers, sign-ups, and sales. Our customers find we’re the only thing ever needed to go further.

Our numbers

Far reaching customer engagement
1.2 bn
Consumer Reach

Our global influence is uncompromisingly expansive.

370 +

We are a truly global company with hundreds of advertisers.

3.1 bn
Monthly Interactions

We connect with users cross-platform for maximum reach.

Ad Experiences

Our expert mobile marketing team repeats success.

Leadership Team

Meet the folks making digital that much more daring every day

    Dimitris Maniatis Chief Executive Officer Read Bio

    Leading Upstream’s mobile-first platform relaunch. Joined as Head of Secure-D. Founder of “all things web” digital agency, now part of IPG, and a head figure in digital media & advertising in Greece.

    Kostas Kastanis Deputy CEO Read Bio

    Leading the strategic development and deployment of Upstream’s portfolio. Joined as Head of Strategy. Extensive management consulting and re-engineering expertise.

    Natalia Mila Chief Technology Officer Read Bio

    Leading Upstream’s technical product, engineering and infrastructure functions. Has worked within Upstream as Software Engineer, Chief Architect and Head of Engineering.

    Chrysa Karamanidi Chief Marketing Officer Read Bio

    Aligning R&D and product portfolio development with business strategy targets. Previously Chief Innovation Officer, Head of Performance Marketing, Digital Marketing and One-D.

    George Serfiotis Chief Financial Officer Read Bio

    The Finance, Business Planning, Legal and HR departments fall under his supervision. Joined as Head of Financial Planning & Analysis.

Board of directors
Marco Veremis

Upstream Co-founder, Chairman of the board

Dimitris Maniatis

Chief Executive Officer

David Kunzmann

Board Member

Guy Krief

Board Member

Hossam Aboumoussa

Board Member

Ken Campbell

Board Member

Rick Phillips

Board Member

Other Board Members: Bilal Balahouane, Ingrid Moinet, Genevieve Koschnicke



    We grow, you grow

    During the time of “all digital”, and while driving growth for even more companies across industries -yes, we ‘ve expanded-, we relaunch our reinforced “grow” technology platform crafting seamless, mobile-first user journeys for even higher results.


    Technology building blocks

    We consolidate our platform and build unique features like our built-in anti-fraud solution or our zero-rated, ad-funded mobile internet portal.


    More extroversion

    We expand our ecosystem with co-operations and partnerships for delivering leading content and experiences from gaming to lifestyle.


    An investing vote

    Actis, the leading global emerging market investor,with US$10bn assets under management, makes a significant investment in Upstream, affirming our business model, technology, people, partner portfolio and unmatched track record of customer engagement and conversion. The same year we set base in Kuala Lumpur.


    The world is ours

    The world is our oyster. 2008 marks our entry to a new exciting chapter turning our sights to the promising land of high growth markets. We open our office in Rio, Brazil, along with operations in Africa.


    The mobile operator era

    The Mobile Operator era. Upstream starts working with mobile operators in Europe, in Greece, Italy, Spain and Portugal, marking the start of a 15 year path that has created our unique mobile-first know-how.


    The beginning

    Marco Veremis and Alex Vratskides are among a company of four, founding Upstream in downtown Athens as a media serving platform. This is where the story begins.

Culture & Careers

Life & Work at Upstream

We like to turn things on their heads, be out-front, change course, and make mistakes if it means becoming better. This is what makes us great. Upstream is a place of growth and acceleration — where we all strive to be the best versions of ourselves.


Engaging for good

We take our impact seriously. Through running events and fundraising campaigns, we stay true to our commitment for quality across all marketing campaigns, leaving the world a better place.


Winner: Top Employee Training Program
Finalist: Best Content Platform
Finalist: Automation Initiative of the Year
Finalist: Most Effective User Acquisition Platform
Finalist: Best Platform or Technology
Winner: Best Apprenticeship Programme (In-House)