Callsign is pioneering digital trust through proprietary technology that uniquely mimics the way humans identify each other in the real world. Positive identification of genuine users delivers privacy, safety and minimal friction whilst ensuring that bad actors are blocked. Through a simple Swipe or Type, users can be personally recognized to a 99.999% accuracy, delivering the highest fidelity AI based user recognition for the digital world.
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Callsign Questions
The Callsign annual revenue was $67.4 million in 2026.
Ian Welch is the Co-Founder and Chief Operating Officer of Callsign.
213 people are employed at Callsign.
Callsign is based in London, England.
The NAICS codes for Callsign are [518, 5112, 511, 51].
The SIC codes for Callsign are [737, 73].
Top Callsign Employees
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24
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Zia Hayat
Chairman and CEO at Callsign
United Kingdom22 -
3
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21
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Larry Costanza
Chief Revenue Officer at Callsign
New York, NY, US15+ -
Adrien Pujol
Chief Information Officer at Callsign
Abu Dhabi, United Arab Emirates34 -
Saeed Ahmad
Managing Director MENA region at Callsign
Abu Dhabi, United Arab Emirates2 -
Ian Cdir
Chief Security Officer at Callsign
United Kingdom1 -
Matthew Gott
SVP of Operations at Callsign
Halifax, GB11 -
Thor Ahmed
SVP, Procurement and Legal at Callsign
United Kingdom1
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