ID5.io
ID5 provides identity solutions for digital advertising, helping media owners, advertisers and platforms track users across devices and channels. The 80-person company raised $27M in a Series B in April 2024.
The growth story
ID5.io grew from 41 to 80 employees between 2022 and 2026, raising $27M along the way, most recently a Series B in April 2024.
About
ID5 sells software that identifies users across websites, apps and devices for digital advertisers and publishers. Its technology helps clients target ads and measure campaigns while complying with privacy rules.
The company has raised $27M, most recently in a Series B round in April 2024. Its 80-person team includes 20 engineers, with staff typically staying for 2 years.
Founders and leadership
Engineering is ID5's largest function with 20 people. The company was founded in 2017 by digital advertising industry experts and is based in London.
The ID5.io org chart
Mathieu Roche (Co-founder & CEO) leads 38 mapped leaders with 4 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Engineering 23 (+15% YoY), Sales 12 (+50% YoY), Business Development 10 (-9% YoY), Information Technology 5 (+67% YoY), Marketing 5 (+25% YoY), Product Management 4 (+33% YoY).
Talent flow
ID5 hires from ad tech firms like TrueData, Sabre and Rubicon Project. Alumni have founded companies including Marvellous Insights, Vidai UK and Neoria.
Most common previous employers of ID5.io staff: TrueData (8), Sabre (4), Accenture (4), Rubicon Project (3), Comarch (3), Verizon Media (3). Former ID5.io employees most often moved to Neoria (2), Say It Now (1), RavenTrack (1), Vidai UK (1), mpathic (1), AZ Technologies (1).
Alumni worth knowing
The ID5.io mafia
Three ID5 alumni have founded companies, including Marvellous Insights, Vidai UK and Neoria. Each startup has hired 2-3 former ID5 staff.
3Anthony Rhind, was Advisor and Board Member until 2021Nagu Gopalakrishnan, was Product Leader, Data Collaboration Platforms & Privacy until 2025Jo Rosamilia, was Marketing Director until 2026Web traffic
Traffic mix: 0% direct, 0% search, 0% social, 0% paid.
What this company is made of
Most common skills at ID5.io: Digital Marketing (26), Microsoft Office (25), Management (24), Online Advertising (24), Business Development (23), Communication (23), Leadership (23), Strategy (21).
Where the team actually sits
ID5.io people are concentrated in England, United Kingdom (8), United Kingdom (4), New York, United States (4), London Area, United Kingdom (3).
Search footprint
ID5.io attracts about 240 organic search visits a month, traffic worth roughly $0K a month if bought through ads. It gained 28 ranking keywords and lost 56 in the last period.
What employees say
- Compensation
- 4.80 / 5
- Career opportunities
- 4.90 / 5
- Senior management
- 5.00 / 5
- Work-life balance
- 4.80 / 5
Frequently asked
ID5.io has 80 employees as of September 2026.
ID5.io has raised $27M in total, most recently a Series B round in April 2024.
ID5.io was founded in 2017 by Mathieu Roche, Pierre-Antoine Durgeat.
Mathieu Roche (Co-founder & CEO) sits at the top of ID5.io's reporting structure, with 4 direct reports.
The most common previous employers of current ID5.io staff are TrueData (8 people), Sabre (4 people), Accenture (4 people).
Former ID5.io employees most often move to Neoria (2), Say It Now (1), RavenTrack (1).
At least 3 companies have a founder who previously worked at ID5.io, including Marvellous Insights, Vidai UK, Neoria.
ID5.io attracts about 240 organic search visits a month, worth roughly $0K a month in equivalent ad spend.
The most common skills among ID5.io staff are Digital Marketing, Microsoft Office, Management, Online Advertising, Business Development.
ID5.io staff are concentrated in England, United Kingdom (8), United Kingdom (4), New York, United States (4).
ID5.io has about 23 people in Engineering, up 15% over the past year, as of September 2026.
ID5.io has about 12 people in Sales, up 50% over the past year, as of September 2026.
Computed from 71 current and 44 former ID5.io profiles, as of September 2026. Source: Crustdata.
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