Nexor Limited is a privately held company based in Nottingham, providing products and services to safeguard government, defence and critical national infrastructure computer systems.

[13][14] Nexor designed and deployed the first public Internet search engine ALIWEB and the associated robots exclusion standard.

[29] Nexor is a contributor to Cyber Champions a community initiative to promote best practices in digital literacy and online safety awareness to schools, youth organisations and interest groups across the UK.

Password[50][51][52] (1993-1995) (Piloting a Secure Service Within OSI R&D) was a European Community-sponsored VALUE program,[53] comprising consortia from France (Inria), Germany (GMD Darmstadt) and the UK (UCL and Nexor), to establish a pilot security infrastructure for network applications for the European research community.

Regis[60][61] (1995–1998) was a collaborative project with Diamond Cable Communications and University of Sheffield to investigate problems inherent in providing regional business communities with low-cost, high-speed access to local information services.

CloudFilter[66][67] (2012–13) was an EPSRC collaborative project with Imperial College to explore novel methods for exercising control over sensitive data propagation across multiple cloud providers.

A project led by 2iC to deliver a proof-of-concept demonstration for a Cross Domain Tactical Service Bus,[68] winning the DSEI Innovation Award 2013.

[69] Project with De Montfort University to research, develop and implement the use of hardware, as a robust alternative to software in high assurance network security devices.

A consortium, led by QinetiQ (called Sirius, comprising over 40 organisations) provides the experience and research capability for CSIIS.

[71] In September 2014, Nexor won the best research poster at the Annual Symposium of the UK Information Assurance Advisory Council (IAAC) based on CSIIS work.

[72] An innovate UK funded consortium to lead R&D in connected and autonomous CAVs on-road implementation, in which Nexor provided cyber security services.