How much funding has Callsign raised?

Callsign has raised $35.0M in total funding, most recently a series a round.

Who are Callsign's investors?

Callsign's investors include Accel, PTB Ventures, Allegis Capital, NightDragon Security.

Where is Callsign headquartered?

Callsign is headquartered in London, England, United Kingdom.

What industry is Callsign in?

Callsign operates in Artificial Intelligence, Cybersecurity.

How many employees does Callsign have?

Callsign has 201-500 employees.

Callsign

Marking a new era in passive authentication, fraud prevention and intelligence

London, United Kingdom · Founded 2011 · $35.0M raised

Artificial Intelligence

Cybersecurity

Headquarters: London, England
Employees: 201–500
Founded: 2011
Business Model: B2B

Website: callsign.com
Total Funding: $35.0M
Last Round: $35.0M Series AJul 2017
Rounds: 1

About

Callsign is a digital identity and fraud prevention platform that uses behavioral biometrics, device intelligence, and AI to authenticate users and detect fraud across web, mobile, and physical interactions. The platform passively analyzes thousands of behavioral data points—including typing dynamics, device signals, and interaction patterns—to confirm genuine identity without disrupting the user experience. Callsign serves banks, telecoms, and enterprises seeking to eliminate fraud while maintaining frictionless customer journeys. Headquartered in London with offices in Manchester, Abu Dhabi, and the United States, it holds ISO/IEC 27001 and SOC certifications.

Summary

Callsign is an Artificial Intelligence company based in London, United Kingdom, founded in 2011. It has raised $35.0M in total across 1 round, most recently a $35.0M Series A round in Jul 2017. Investors include Accel, PTB Ventures and Allegis Capital.