Callsign
Callsign is a cybersecurity company specializing in Fraud & Payment Security, founded in 2012 and headquartered in London, United Kingdom. It has raised $38.75M in equity across 6 priced rounds, employs about 285 people, and is privately held.
updated Oct 11, 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
- Oct 2022Feature launchCallsign Launches New Dynamic Interventions Capability
- Oct 2021PartnershipCallsign joins the Visa Fintech partner connect programme
- Jul 2021Recognition
Callsign Momentum score
41/ 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
- Callsign Dynamic InterventionsDynamic fraud interventions using contextual, personalized step-up auth.Details ↗
- Callsign Orchestration LayerNo-code orchestration platform for fraud detection policy mgmt & testing.Details ↗
- Callsign 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 285 employees, up 2% over the last 30 days.
- Employees
- 285
- 30-day change
- +2%
- 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.
ranked by CybersecTools comparison demand, 90 days
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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
