Callsign
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.
- Company typePrivate
- Founded2012
- HeadquartersLondon, United Kingdom
- Headcount101–250
- GTM typeB2B
- OfferingSoftware
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).
Callsign firmographics
Firmographics- 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
Callsign industry classification
Industry- 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
Where Callsign is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices3 records
Markets served
Callsign business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Infrastructure, Operations
Revenue model
- SaaS Authentication Platform: Subscription-based authentication platform licensing providing Intelligence Driven Authentication, behavioral biometrics, device fingerprinting, and orchestration capabilities to enterprises.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Annual | Enterprise SaaS licensing - custom pricing |
Go-to-market motion4 records
Distribution channels5 records
Marketing channels5 records
Callsign product offering
Product offeringCore 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
Companies that use Callsign
Customer profileNamed customers7 records
Segments4 records
Ideal customer profiles4 records
Callsign technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration6 records
AI capability7 records
Feature9 records
Callsign partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered minor and core.
- The KnobleminorThe Knoble chose Callsign as global partner to provide intelligent authentication solutions for their members.
- VisacoreCallsign 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)minorJoined 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 GroupcoreCallsign 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 UKcoreThree 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 UniversityminorPartnership 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.
- MicrosoftcoreCallsign listed on Microsoft AppSource for organizations and Azure Marketplace for developers. Enables banks and enterprises to discover and integrate Callsign software with Microsoft products.
- TemenoscoreIntegration 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)coreGlobal 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
Callsign competitors and assessment
Company assessmentDirect 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
Callsign social profiles
Digital presenceCallsign compliance and trust
Trust signalCompliance2 records
Callsign financial estimates
Financial estimateRevenue estimate
Valuation estimate
Callsign leadership team
Management profileNumber of profiles
Profiles17 records
Callsign funding detail
Funding detailFunding overview
Funding rounds6 records
Investors11 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Callsign M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Callsign
What does Callsign do?
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.
Is Callsign a public or private company?
Callsign is a private company. It is classified as venture growth investor backed and is currently operating.
When was Callsign founded?
Callsign was founded in 2012. It employs 101 to 250 people.
Where is Callsign based?
Callsign is headquartered in London, United Kingdom, in the Europe region.
How does Callsign make money?
One revenue line is on record: saaS Authentication Platform.
Who are Callsign's main competitors?
Direct peers on record are BioCatch, BehavioSec (LexisNexis Risk Solutions), Feedzai and NuData Security (Mastercard). Broad incumbents are OneSpan, Okta, Microsoft Entra ID and Ping Identity. Emerging players are HYPR and Beyond Identity.
Does Callsign have an API?
No public API is recorded for Callsign.
What industry is Callsign in?
Callsign's product category is Identity & Access Management / Authentication Software. Its primary akta.pro industry code is BPAMAEAE, Authentication (MFA/Passwordless/Biometrics) Platforms, with a secondary code of HDAEAJAH, Identity Threat Detection & Response (ITDR). Its NAICS code is 541511 and its SIC code is 7372.