Callsign
Callsign is an artificial intelligence company in London, United Kingdom, founded in 2011. It has raised $35.0M across 1 round, most recently a $35.0M Series A in July 2017.
Marking a new era in passive authentication, fraud prevention and intelligence
- Headquarters
- London
- Employees
- 201–500
- Founded
- 2011
- Business Model
- B2B
- Website
- callsign.com
- Total Funding
- $35.0M
- Last Round
- $35.0M Series AJul 2017
- Rounds
- 1
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 1 funding round and 4 investors for this company. The full record is or through the API.
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
It lists 201–500 employees. 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.
Tech & App Stack
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Funding History
Jul 2017
Investors
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