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Callsign's Overview

Total employees226
HeadquartersLondon
Founded2011

Callsign is a pioneering company in the digital identity and authentication space. It leverages deep learning, artificial intelligence, behavioral biometrics, and multi-factor authentication to help organizations definitively recognize genuine users, protecting against fraud and ensuring secure, seamless access. Callsign's intelligence-driven authentication platform is designed for enterprises, particularly in financial services, e-commerce, and government sectors, to build trust, enhance user experience, and meet regulatory requirements. Their core mission is to make digital identification simple and secure for everyone.

Where is Callsign's Headquarters?

HQ Function

The London headquarters serves as the central hub for Callsign's global operations, including executive leadership, product strategy, research and development, engineering, and core business functions.

Notable Features:

Located in a modern building in the vibrant South Bank area, offering contemporary office facilities designed to foster collaboration and innovation. Specific architectural details are typical of modern, high-spec office developments.

Work Culture:

Callsign cultivates a dynamic and innovative work culture, emphasizing problem-solving, technological advancement, and collaboration. As a company in the cybersecurity and identity sector, there's a strong focus on precision, security, and agility.

HQ Significance:

The London HQ is significant due to its proximity to a rich talent pool, major financial institutions, and a thriving tech ecosystem, enabling Callsign to stay at the forefront of the digital identity industry and serve its global clientele effectively.

Values Reflected in HQ: The headquarters' design and location likely reflect Callsign's values of innovation, security, and global connectivity, providing an environment conducive to cutting-edge technological development and international business operations.

Location:

Callsign supports a global client base with functions such as sales, customer success, engineering, and research & development distributed across its key office locations in Europe, the Middle East, Asia-Pacific, and North America. The company is focused on serving industries like financial services, e-commerce, and government entities worldwide, providing them with advanced intelligence-driven authentication solutions.

Street Address:

10 York Road

City:

London

State/Province:

England

Country:

United Kingdom

Callsign's Global Presence

Abu Dhabi, UAE

Address: Abu Dhabi Global Market (ADGM), Abu Dhabi, UAE (Specific street address not publicly listed)

To drive market penetration, provide localized support, and foster strategic partnerships across the MEA region, a key growth market for digital services.

Singapore

Address: Singapore (Specific street address not publicly listed)

To cater to the growing demand for secure digital identity solutions in the diverse APAC market and build relationships with regional clients and partners.

New York, NY, USA

Address: New York, NY (Specific street address not publicly listed)

To expand Callsign's footprint in North America, a key market for digital identity, fraud prevention technologies, and financial services.

Buying Intent Signals for Callsign

Highperformr Signals uncover buying intent and give you clear insights to target the right accounts at the right time — helping your sales, marketing, and GTM teams close more deals, faster.

Notable news
Hiring actively
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance
*Example signal, not calculated in real time

Executive Team of Callsign

As of April 2025, Callsign' leadership includes:

Martin Krajewski - Chief Executive Officer
Tim Joyce - Chief Financial Officer
Saeed Ahmad - Chief Product Officer
Phil Mues - Chief Revenue Officer
Diana PGc - Chief Marketing Officer
Zia Hayat - Founder & Non-Executive Director

Investors of Callsign

Callsign has been backed by several prominent investors over the years, including:

NightDragon
AllegisCyber Capital
PTB Ventures
Dell Technologies Capital
Blackstone
Stanford-StartX Fund

Executive New Hires/Exits in the Last 12 Months

Hire5
Exits1

Callsign has undergone a significant leadership refresh in the past 12 months, with key appointments including a new CEO, CFO, CPO, CRO, and CMO. Founder Zia Hayat transitioned from CEO to a Non-Executive Director role.

Departures

Zia Hayat, Zia Hayat transitioned from the role of CEO to Non-Executive Director.

New Appointments:

Martin Krajewski, Martin Krajewski appointed as new CEO, formerly Non-Executive Director.
Tim Joyce, Tim Joyce appointed as new CFO.
Saeed Ahmad, Saeed Ahmad appointed as new CPO.
Phil Mues, Phil Mues appointed as new CRO.
Diana PGc, Diana PGc appointed as new CMO.

Technology (Tech Stack) used by Callsign

Discover the tools Callsign uses. Highperformr reveals the technologies powering your target accounts — helping your sales, marketing, and GTM teams prioritize smarter and close faster.

Callsign Email Formats and Examples

Callsign likely uses common corporate email formats for its employees. The most prevalent patterns usually involve combinations of the employee's first name, last name, or initials.

[first].[last]@callsign.com

Format

jane.doe@callsign.com

Example

80%

Success rate

News and media

FinextraMarch 26, 2024

Callsign Appoints Martin Krajewski as Chief Executive Officer

Callsign announced the appointment of Martin Krajewski as its new Chief Executive Officer. Krajewski, who previously served as a Non-Executive Director on Callsign's board, brings extensive experience to lead the company into its next phase of growth....more

Callsign BlogMarch 19, 2024

Callsign recognised in 2024 Gartner® Magic Quadrant™ for Identity Verification

Callsign announced its recognition in the 2024 Gartner Magic Quadrant for Identity Verification. This acknowledgment highlights Callsign's position and capabilities in the evolving digital identity landscape....more

Callsign BlogNovember 14, 2023

Welcoming Tim Joyce, Callsign’s New Chief Financial Officer

Callsign welcomed Tim Joyce as its new Chief Financial Officer. Joyce brings a wealth of experience in financial leadership and is set to drive Callsign's financial strategy and growth....more

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