What public tech company should I research for my final project?

I am a final year university student in London and love tech. As part of my degree I need to produce a (massive/100hr) research report on a company, its competitive position, financial promise and ultimately investment case. Since I love tech, I want to do a US or UK tech company. I would love to hear the HN community's views on promising tech public companies that you think would be cool to research. I will happily share the report with the HN community if it would be of interest.

Criteria: 1) US or UK based company 2) Public company (so post IPO) 3) In tech 4) Cool and interesting to research

Any suggestions greatfully received. Ben