Ovum, now part of Omdia, was[vague] an independent analyst and consultancy firm headquartered in London, specializing in global coverage of Telecommunications, Media and Technology.

In 1985, Johnson was joined by four ex-colleagues from Logica (Ron Sasson, David Lewin, Richard Kee and Jules Hewett) and moved into its first office in central London.

From this point, it grew rapidly in the telecoms and software sectors, enjoying 16 years of uninterrupted growth, and opening several offices around the world.

Ovum suffered during the tech crash of the early 2000s, but had recovered by the mid-2000s and was able to float on the London Stock Exchange's AIM in March 2006[2].

The company has given positive reviews of: Ovum analysts are frequently quoted in the media over various global channels when technology and telecoms news stories are reported.