What is Leiki?

Leiki provides market leading solutions for Content Discovery and Data on Audiences and Content.
Our customers are publishers, retailers and advertisers who want to:

Show their visitors relevant content across sites, automatically on each page.

Understand user interests and increase advertising income with dynamic segments.

Maximise traffic and revenues with intelligent content discovery and ad targeting.

Latest blog posts

We are hiring! Algorithm Developer (Java)

Want to do something interesting? Tired of working in a boring software project you don’t really care about? Come work at Leiki! We are looking for an Algorithm Developer (Java).

Get creative – suggest an audience segment and win 2M impressions!

Leiki SmartSegments are intelligent audience segments you can’t find anywhere else – now available in Finland! We can easily create new segments tailored to advertiser’s precise campaign needs. Do you have a specific audience you’d like to reach? Write below...

Come meet us at Mobile World Congress

Come meet Leiki this week at Mobile World Congress in Barcelona! Contact us to book a meeting or drop by at the Team Finland stand in Hall 5F where we’ll be showcasing our Smart Services.

Leiki introduces advanced SmartSegment audiences

Leiki is launching today new advanced semantic audience segments. Now advertisers can target their online ads to user groups who have shown interest in precise topics and product categories the advertisers care about.

Leiki loves privacy

As a company working on the cutting-edge of semantic technology, we take just as much pride in providing the highest level of behavioral recommendations as we do on providing complete privacy to the end-users.


 Dr. Petrus Pennanen

Dr. Petrus Pennanen

CEO & Founder

After getting a PhD in theoretical nuclear physics Petrus did a couple of years of postdoctoral research before founding Leiki and developing the core algorithms for Leiki Focus. In 2005 he was placed as a nominee for World Technology Award. Petrus enjoys meeting customers and discussing how to take their business forward. After work he likes running and music ranging from electronic to opera. You can reach Petrus on his mobile: +358 40 5020355.

Click here for a personal story on Leiki.

Roy McDonald, MBA, A.B. (Physics)

Roy McDonald, MBA, A.B. (Physics)

Head of Operations USA

With education from Stanford and Harvard Roy gained extensive experience building cutting edge technology-based products and became a highly successful and innovative CEO in technology and finance. He’s passionate about team building, product innovation, and market creation. Having built and sold successful businesses and product lines to Microsoft, Logitech, Sony, and Apple he has a strong track record of forming creative, collaborative and apolitical teams. You can reach Roy on his mobile: +1 650 5541959.

Tomi Päiväniemi

Tomi Päiväniemi


After getting his degree Tomi worked as a researcher in artificial intelligence and information retrieval. He has been at Leiki for 6 years developing the IP with his team and passionately serving our customers. After years of partner dancing as a hobby he’s now also teaching it.

Noora Staf

Noora Staf

Marketing Director, MSc (Econ.)

Noora is in charge of Leiki’s marketing and has key role in the office administration. She finished her degree in Sweden and started her marketing career in the world of fishing tackle in Ireland. In addition to making sure everything runs smoothly at Leiki and with our partners, Noora is also passionate about dance & travel, runs a popular blog combining those subjects and is an active member of the local Brazilian Zouk community.


Helsinki headquarters
Phone: +358 201 556055
Fax: +358 201 556056
Email: info@leiki.com

Mailing address: (Click here for a map)
Leiki Oy
Pohj. Makasiinikatu 7 A 4
00130 Helsinki, Finland

>> Full contact info

Leiki Americas
Phone:  +1 650 5541959

San Mateo, CA