About us

Celtra empowers agencies, media suppliers and brand leaders with the leading creative technology for data-driven brand display advertising across all screens.

  • Ads built
    using AdCreator

  • Employees

  • Countries Where
    Our Ads Are Run


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Celtra founded!
Seed funding:
RSG Capital
AdCreator’s predecessor
introduced - Celtra.ADV
at Ad:Tech
Series A funding:
GrandBanks Capital,
Fairhaven Capital Partners
AdCreator 2.0 announced
at the MMA Forum
Rich Media Post for
Facebook and Twitter
Bronze Stevie
Most Innovative Tech
Company of the Year
Innovative Mobile
Technology of the Year
Industry’s first
Store Locator
AdCreator 3
for mobile advertisers
Bronze Stevie
Best New Product
Reached 1 Billion
monthly impressions
Series B funding:
Fairhaven Capital Partners,
GrandBanks Capital,
SoftBank Capital
All 5 IAB Mobile
Rising Stars supported
Silver Stevie
Best New Product
OnMobile Top 100
Smart Video Ad Formats
with groundbreaking
video technology
iMedia ASPY Award
Best Ad Product Innovation
OnMedia Top 100
Reached 5 Billion
monthly impressions
Mihael Mikek

Mihael Mikek

Founder &
Chief Executive Officer
Matevz Klanjsek

Matevz Klanjsek

Co-founder &
Chief Product Officer
Maja Mikek

Maja Mikek

Co-founder &
Chief Finance Officer
Jaka Jancar

Jaka Jancar

Chief Technology
Jonathan Milne

Jonathan Milne

Chief Revenue Officer
Gregor Smrekar

Gregor Smrekar

Chief Operating Officer
Alex Saric

Alex Saric

Chief Marketing Officer

Our offices

  • Headquarters 545 Boylston Street, 11th fl.
    Boston, MA 02116
  • New York City 915 Broadway, Suite 1105
    New York, NY 10010
  • San Francisco 225 Bush Street, Suite 1805
    San Francisco, CA 94104
  • Chicago 320 West Ohio Street, Suite 35
    Chicago, IL 60654
  • London 56a Poland Street
    London, W1F 7NN, UK
  • Ljubljana Kongresni trg 3
    1000 Ljubljana, Slovenia
  • Singapore 1 Keong Saik Rd
    Singapore 089109
  • Sydney 17-19 Bridge Street
    Sydney NSW 2000, Australia

Our Investors

SoftBank Capital
GrandBank Capital
Fairhaven Capital
RSG Capital