founders.io ⌕
Companies Founders Rankings Reports Investors Startup mafias Connection finder Y Combinator Unicorns 🦄 About Contribute
C
Company · Enterprise Software

Callsign

Callsign was founded in 2011 in London, United Kingdom by Ian Welch and Zia Hayat. It is an Enterprise Software company.

Delivering digital trust through simple secure customer interactions

Private Founded 2011 London United Kingdom Enterprise Software
Website ↗ Suggest an edit

Callsign founders & co-founders

2
I
Ian Welch
Co-founder
 Z
Zia Hayat
Co-founder

More in Enterprise Software

All Enterprise Software →
I
Instabase
Enterprise Software · USA
Private 🦄 UnicornFounded 2015
C
Cohesity
Enterprise Software · USA
Private 🦄 UnicornFounded 2013
C
Compass RE
Enterprise Software · United States
Private 🦄 UnicornFounded 2012
B
bKash
Enterprise Software · Bangladesh
Private 🦄 UnicornFounded 2010
N
Nutanix
Enterprise Software · USA
Public 🦄 UnicornFounded 2009
S
Slack
Enterprise Software · USA
Acquired 🦄 UnicornFounded 2009
B
Box
Enterprise Software · USA
Public 🦄 UnicornFounded 2005
S
Sherpa
Enterprise Software · USA
Private YC S26Founded 2026