Callsign
Callsign is a cybersecurity company specializing in IAM, founded in 2012 and headquartered in London, United Kingdom. It has raised $38.75M in equity across 6 priced rounds, employs about 275 people, and is privately held.
updated Sep 12, 2026
Latest Callsign news and company activity
What Callsign did, dated — selected moves from the record, one per kind, newest first.
- Mar 2025Exec changeCallsign's chief commercial and strategy officer Amir Nooriala leaves
- Jul 2021RecognitionCallsign invited to join the World Economic Forum's Global Innovators Community
4 events tracked since Mar 2021 · selected events shownUnlock the complete Callsign timeline
Callsign Momentum score
25/ 100
Mandos Momentum blends hiring, funding, traffic and sentiment into one score out of 100. The score is free; the pillars behind it unlock in the platform.
Callsign products
- CCallsign Dynamic InterventionsDynamic fraud interventions using contextual, personalized step-up auth.Details ↗
- CCallsign Orchestration LayerNo-code orchestration platform for fraud detection policy mgmt & testing.Details ↗
- CCallsign Device FingerprintingCloud-native device fingerprinting for bot, malware, and fraud detection.Details ↗
Callsign funding
Callsign has raised $38.75M in priced equity. Its most recent round was a Venture Round in April 2021.
- Equity raised
- $38.75M6 priced rounds
- Last round
- Venture RoundApr 2021
Callsign employees and hiring
Callsign has about 275 employees, down 1% over the last 30 days.
- Employees
- 275
- 30-day change
- -1%
- Open roles
- 0
Callsign competitors
Security professionals most often compare Callsign against Akamai on cybersectools.com. The full competitive set, with overlap scoring, is in the platform.
by search demand for comparison pages on cybersectools.com, 90 days
The other 440 data points.
- Funding historyevery round, every investor named
- Headcount growthvelocity, departments, seniority
- Open jobslive postings, hiring pace, role mix
- Tech stackframeworks, clouds, security
