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 +

Advertisers

We are a truly global company with hundreds of advertisers.

3.1 bn

Monthly Interactions

We connect with users cross-platform for maximum reach.

4000

Ad Experiences

Our expert mobile marketing team repeats success.

Leadership Team

Meet the folks making digital that much more daring every day

Salim Khoury Executive Chairman Read Bio

Bringing over 35 years of experience in scaling businesses across emerging markets, with a focus on telecom and digital transformation.

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.

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.

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.

Simon Yomtov Chief Global Sales Read Bio

Leading Upstream's global sales strategy and execution. Joined Upstream's Johannesburg office over a decade ago before assuming responsibility for global sales.

Board Team

Meet the board helping turn bold ideas into lasting direction

Salim Khoury Executive Chairman Read Bio

Bringing over 35 years of experience in scaling businesses across emerging markets, with a focus on telecom and digital transformation.

Samer Halimeh Board Member Read Bio

Lebanese-American entrepreneur, investor, philanthropist, and innovator with a distinguished track record of building and growing successful businesses across high end jewelery luxury, real estate and technology, telecommunications, food & beverage.

2025

2020

2018

2017

2014

2008

2006

2001

2025

A bold new chapter

Stepping into a dynamic new era, we are proud to join the Intersel family. Together, we are uniting our strengths to elevate our technology, pioneer new frontiers in AI-driven innovation, and deliver deeply impactful customer journeys worldwide.

2020

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.

2018

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.

2017

More extroversion

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

2014

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.

2008

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.

2006

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.

2001

The beginning

Marco Veremis and Alex Vratskides are 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.