![]() 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 2000 | Founding Date 2012 | Founding Date 2015 |
Type | Type Subsidiary | Type Subsidiary | Type Private |
Tags | |||
Locations | Locations Fairfax, US HQ Braddon, AU Dublin, IE | Locations London, GB HQ Singapore, SG Abu Dhabi, AE Manchester, GB Palo Alto, US | Locations Menlo Park, US HQ Tel Aviv, IL |
Employees | Employees 2865% increase | Employees 17511% increase | Employees 373% decrease |
Operating ⚠ | |||
Solutions | Solutions 12 (Mar, 2021) | Solutions 3 (Feb, 2024) | Solutions N/A |
Funding | |||
Total funding raised | Total funding raised N/A | Total funding raised $ 35m | Total funding raised $ 22.5m |

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