Callsign
Track on RadarDigital identity platform using behavioral biometrics for auth and fraud prevention.
- Total raised
- $38.75M
- Employees
- 275
- Founded
- 2012
- Momentum
- 25
Stalling
Data updated August 2026
About
About Callsign
At a glance
Callsign is a cybersecurity company specializing in IAM, founded in 2012 and headquartered in London, United Kingdom. It has raised $38.75M in total funding, employs about 275 people, and is privately held.
Callsign is a digital identity and authentication platform focused on identifying and verifying users across web, mobile, and physical interactions. The company's core technology centers on behavioral biometrics and AI-driven intelligence to authenticate users and prevent fraud without compromising user experience or privacy. The platform analyzes behavioral signals and user characteristics to establish identity, enabling businesses to distinguish legitimate users from fraudsters. Callsign uses data obfuscation techniques that analyze behaviors rather than individuals directly, positioning the approach as privacy-conscious by design. Data collection is event-based rather than continuous surveillance. Key capabilities of the platform include: - Behavioral biometrics for passive, continuous authentication - Fraud prevention and scam detection, including telco-based scam models - Orchestration of identity decisions in real time - Compliance with privacy regulations Callsign targets financial services and other industries where digital trust, fraud prevention, and secure customer onboarding are critical concerns. The company's technology is designed to integrate into existing digital journeys to reduce friction for legitimate users while blocking fraudulent activity. The company was founded by Zia Hayat, inspired by early internet fraud events dating back to 1994. Callsign emphasizes ethical AI principles, stating that its systems are built to respect user privacy and avoid surveillance-style data collection. The company is headquartered in the United Kingdom.
Momentum
How Callsign is trending
Momentum score
Score history appears once we have at least two monthly snapshots.
Pillar breakdown
Pillar breakdown locked
Growth, Market & Financial sub-scores
Valuation
What Callsign is worth
Estimated valuation
Products
Callsign's products
Callsign Dynamic Interventions
Dynamic fraud interventions using contextual, personalized step-up auth.
Callsign Orchestration Layer
No-code orchestration platform for fraud detection policy mgmt & testing.
Callsign Device Fingerprinting
Cloud-native device fingerprinting for bot, malware, and fraud detection.
Funding
Funding history
See every round, lead investor, and the full capital stack.
Open the full profile on Mandos to see funding history.
Public markets
Stock performance
Privately held
This company isn't publicly traded. Stock performance will appear here after an IPO.
Headcount
Headcount growth
Track hiring velocity, department mix, and seniority shifts.
Open the full profile on Mandos to see headcount growth.
Jobs
Open jobs
Every live posting, hiring pace, and role-level signal.
Open the full profile on Mandos to see open jobs.
Web traffic
Digital presence
Visits trend, bounce rate, engagement, and top countries.
Open the full profile on Mandos to see digital presence.
Tech stack
Technologies
The full stack behind the product — frameworks, clouds, security.
Open the full profile on Mandos to see technologies.
M&A
Acquisitions
Every acquisition this company has made, with dates and amounts.
Open the full profile on Mandos to see acquisitions.
Reviews & sentiment
Employee & product reviews
CEO approval, culture, comp, and detailed product ratings.
Open the full profile on Mandos to see employee & product reviews.
Leadership
Full leadership team
CEO, CxOs, VPs, and every exec with roles.
Open the full profile on Mandos to see full leadership team.
Competitors
Competitive landscape
The complete competitor set with overlap and positioning.
Open the full profile on Mandos to see competitive landscape.
News
Press & news coverage
The most recent mentions, announcements, and media coverage.
Open the full profile on Mandos to see press & news coverage.
Full profile
This public profile is a snapshot
The full Mandos profile of Callsignadds funding rounds & investors, valuation estimates, headcount & hiring trends, technology stack, executive moves, and real-time monitoring.
FAQ
Frequently asked questions about Callsign
When was Callsign founded?▾
Callsign was founded in 2012.
Where is Callsign headquartered?▾
Callsign is headquartered in London, United Kingdom.
How much funding has Callsign raised?▾
Callsign has raised a total of $38.75M in total funding.
Is Callsign public or private?▾
Callsign is a privately-held company.
How many employees does Callsign have?▾
Callsign has approximately 275 employees.
What does Callsign do?▾
Callsign is a digital identity and authentication platform focused on identifying and verifying users across web, mobile, and physical interactions. The company's core technology centers on behavioral biometrics and AI-driven intelligence to authenticate users and prevent fraud without compromising…