![]() Callsign Сallsign is a company developing passive authentication, fraud prevention, and intelligence solutions. | ![]() Secret Double Octopus Secret Double Octopus (SDO) is a company that develops multi-factor authentication (MFA) software. | ||
Founding Date | Founding Date 2010 | Founding Date 2012 | Founding Date 2015 |
Type | Type Public | Type Subsidiary | Type Private |
Tags | |||
Locations | Locations New York, US HQ | Locations London, GB HQ Singapore, SG Abu Dhabi, AE Manchester, GB Palo Alto, US | Locations Menlo Park, US HQ Tel Aviv, IL |
Employees | Employees 3,69821% increase | Employees 17511% increase | Employees 373% decrease |
Financial | |||
Revenue (est.) | Revenue (est.) $900.8m (FY, 2025) | Revenue (est.) £14.3m (FY, 2022) | Revenue (est.) N/A |
Net income | Net income $168.1m (FY, 2025) | Net income (£42.1m) (FY, 2022) | Net income N/A |
Funding | |||
Total funding raised | Total funding raised $ 135m | Total funding raised $ 35m | Total funding raised $ 22.5m |

Сallsign is a company developing passive authentication, fraud prevention, and intelligence solutions.
View company
Secret Double Octopus (SDO) is a company that develops multi-factor authentication (MFA) software.
View company