Callsign

What Callsign does

Callsign is a London-headquartered, privately held AI-driven authentication and fraud-prevention company founded in 2012 by Zia Hayat. Its core product is the Intelligence Driven Authentication (IDA) platform, which ensembles behavioral biometrics (typing rhythm, swipes, mouse and device-tilt patterns), device fingerprinting, telco intelligence (for SIM-swap and call-divert detection), and location signals to identify genuine users and detect fraudulent activity in real time. The platform's Orchestration Layer enables adaptive authentication journeys and Dynamic Interventions that intervene against social-engineering scams as they happen, with claimed 99.999% identification accuracy and EBA endorsement for PSD2 Strong Customer Authentication compliance.

The company sells primarily to Tier 1 banks, financial institutions, government bodies, and large enterprises, with publicly disclosed customers including Lloyds Banking Group, Deutsche Bank, FirstOntario Credit Union, UnionDigital Bank, and Three UK. Callsign operates a subscription-based enterprise SaaS model with custom, quote-based annual pricing distributed through direct field sales complemented by channel and marketplace listings on Temenos Marketplace, Microsoft AppSource, Azure Marketplace, Visa Fintech Partner Connect, and the Nexmo/Vonage partner program. It is incorporated as Callsign Inc. (Delaware), maintains ISO 27001 and SOC 2 Type 2 certifications, and has expanded internationally with an APAC headquarters in Singapore (2021) and an engineering/R&D center of excellence in Abu Dhabi (2021), supported by a leadership bench including a CSO recruited from the UK National Crime Agency and Vice Chairman David DeWalt (former McAfee/FireEye CEO).

To date, Callsign's most significant disclosed capital event is a $35 million Series A led by Accel in July 2017 (with PTB Ventures, Allegis Capital, and NightDragon Security), followed by strategic investments from JP Morgan (2020) and HSBC Ventures (2021). The company has been recognized as a World Economic Forum Technology Pioneer (2019) and a Javelin Strategy & Research Leader in authentication (2024).

Name

Callsign

Legal name

Callsign Inc.

Website

https://callsign.com

Company type

Private

Founded year

2012

Operating status

Operating

Headcount range

101–250 employees

Short description

Callsign is a London-based AI authentication and fraud-prevention company that sells subscription-based behavioral-biometrics and device-intelligence SaaS to Tier 1 banks, financial institutions, telecoms, and government clients worldwide.

Ownership category

akta.pro rank

Product category

Identity & Access Management / Authentication Software

NAICS

Custom Computer Programming Services (541511)

SIC

Services-Prepackaged Software (7372)

akta.pro primary industry

Authentication (MFA/Passwordless/Biometrics) Platforms (BPAMAEAE)

akta.pro secondary industries

Identity Threat Detection & Response (ITDR) (HDAEAJAH), Identity Verification & Digital ID (IDV, eIDAS, biometrics) (FSAGAFAA), Voice Security, Fraud Prevention & Authentication (STIR/SHAKEN, anti-spam) (HDAIAHAL)

Keywords

• Behavioral biometrics
• Identity verification
• Fraud prevention
• Multi-factor authentication
• Digital identity

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Infrastructure, Operations

Revenue model

1. SaaS Authentication Platform: Subscription-based authentication platform licensing providing Intelligence Driven Authentication, behavioral biometrics, device fingerprinting, and orchestration capabilities to enterprises.

Pricing tiers

Go-to-market motion4 records

Distribution channels5 records

Marketing channels5 records

Core offering

Callsign sells a SaaS-based Intelligence Driven Authentication (IDA) platform that uses AI, deep learning, and behavioral biometrics to verify user identities and prevent fraud. The platform analyzes thousands of data points across device, location, behavioral, and telco signals to confirm whether users are genuine, enabling enterprises to build adaptive, risk-based authentication journeys without customer friction. It is licensed primarily to Tier 1 banks, financial institutions, telecommunications operators, and large enterprises.

Product overview

Callsign offers a unified AI-powered platform for fraud prevention, authentication, and digital trust. The platform architecture consists of three core components: the Intelligence Engine (analyzing behavioral, device, telco, and location data), the Orchestration Layer (managing adaptive authentication journeys with Dynamic Interventions), and the Authentication Suite (providing passive multi-factor authentication including Callsign One). The platform integrates with major banking systems (Temenos, ForgeRock), communications APIs (Nexmo/Vonage), and open banking platforms (Ozone). Solutions cover account takeover protection, social engineering and scams prevention, threat detection (malware and bots), SIM swap and call divert prevention, synthetic identity detection, and PSD2/KYC/AML compliance. The company also publishes the Digital Trust Index research measuring the economic value of digital trust.

Differentiator

Problem solved

Functional benefit

Products and services

• Intelligence Engine Core AI-powered intelligence layer of the Callsign platform that analyzes behavioral, device, location, and threat data to power authentication decisions. Combines behavioral biometrics, device fingerprinting, telco intelligence, and ensembling capabilities to build unique individual identity profiles for enterprises.
• Orchestration Layer

Quantifiable outcome

• 99.999% user identification accuracy using behavioral biometrics
• +3 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

AI capability7 records

Feature9 records

Partnerships

Nine partnerships are on record, tiered minor and core.

• The KnobleminorGTM or Marketing Partner · 1 December 2022The Knoble chose Callsign as global partner to provide intelligent authentication solutions for their members.
• VisacoreGTM or Marketing Partner · 7 October 2021Callsign joined Visa Fintech Partner Connect program. Visa introduces Callsign's behavioral biometric and device fingerprinting solutions to Visa's network of financial institutions, PSPs, and merchants across Europe.
• Financial Data Exchange (FDX)minorStrategic or Co-development Partner · 8 October 2020Joined FDX, a non-profit organization unifying the financial industry around technical standards for secure exchange of user permissioned financial data. FDX has 150 members including financial institutions, aggregators, fintechs, and payment networks.
• Lloyds Banking GroupcoreStrategic or Co-development Partner · 11 July 2019Callsign partnered with Lloyds Banking Group to provide digital identification and authentication solutions, rolling out the platform to all customers across its core brands. The partnership supports the bank's commitment to protecting customers from fraud while providing seamless customer experience.
• CKH IOD / Three UKcoreTechnology or Integration · 9 April 2019Three UK became the first 3 Group operator and first mobile operator in the UK to enable Callsign's enhanced customer protection technology for SIM-swap and call divert fraud detection.
• London Metropolitan UniversityminorStrategic or Co-development Partner · 9 October 2018Partnership with London Metropolitan University's Cyber Security Research Centre. Callsign set up a dedicated office for malware and fraud detection research, with two post-docs joining the Callsign team.
• MicrosoftcoreChannel Partner/ Reseller/ Distributor · 26 June 2018Callsign listed on Microsoft AppSource for organizations and Azure Marketplace for developers. Enables banks and enterprises to discover and integrate Callsign software with Microsoft products.
• TemenoscoreTechnology or Integration · 6 April 2018Integration of Intelligence Driven Authentication technology with Temenos banking software. Pre-integrated through Open Banking API interfaces into Temenos T24, Temenos Connect Internet Banking and Mobile Banking solutions.
• Global Cyber Alliance (GCA)coreStrategic or Co-development Partner · 21 February 2017Global partnership to deliver Intelligence Driven Authentication as a new global standard for improved security. GCA is an international cross-sector organization designed to confront, address, and prevent malicious cyber activity.

Scale indicators8 records

Recent moves3 records

Expansion highlights6 records

Direct peers

• BioCatch: BioCatch is the leading pure-play behavioral biometrics company for banking and financial services. It competes head-to-head with Callsign on behavioral authentication, fraud prevention, and account takeover protection, serving similar Tier 1 banks globally.
• BehavioSec (LexisNexis Risk Solutions): BehavioSec pioneered behavioral biometrics and is now part of LexisNexis Risk Solutions. It offers overlapping capabilities to Callsign in device and behavior-based authentication for fraud prevention across banking and enterprise.
• Feedzai: Feedzai is a fraud prevention platform focused on financial services, offering transaction monitoring and behavioral analytics. It serves many of the same Tier 1 bank customers and competes on AI-driven fraud detection.
• NuData Security (Mastercard): NuData Security, now a Mastercard company, provides behavioral biometrics and device intelligence for fraud prevention. It competes directly with Callsign on passive authentication and fraud detection for banking and e-commerce.

Broad incumbents

• OneSpan: OneSpan offers multi-factor authentication, e-signatures, and fraud detection for banks and enterprises. It serves similar financial institution customers with a broader portfolio that overlaps Callsign's authentication suite and PSD2/SCA solutions.
• Okta: Okta is a leading identity and access management platform offering authentication, MFA, and workforce/customer identity. It competes with Callsign in customer authentication, especially for enterprise buyers who prefer a single-vendor identity platform.
• Microsoft Entra ID: Microsoft Entra ID (formerly Azure AD) is the dominant enterprise identity platform, often bundled with Microsoft 365. It is a Callsign partner (listed on Microsoft AppSource) but also a competitor for customer authentication budgets.
• Ping Identity: Ping Identity (now merged with ForgeRock) is a major IAM platform offering authentication and identity orchestration. Callsign integrates with ForgeRock but competes at the broader identity platform level for enterprise and banking customers.

Emerging players

• HYPR: HYPR focuses on passwordless authentication using device-based cryptographic credentials. It addresses the same enterprise authentication and fraud prevention problem as Callsign but with a different technical approach (FIDO/passkeys vs behavioral biometrics).
• Beyond Identity: Beyond Identity offers passwordless, device-based authentication with risk signals. It competes for the same enterprise authentication budgets as Callsign, particularly with a stronger focus on workforce identity and zero-trust.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/Callsign
• LinkedInlinkedin.com/company/callsign

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles17 records

Funding overview

Funding rounds6 records

Investors11 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Callsign