The reference from that first wikipedia article, here: https://find-and-update.company-information.service.gov.uk/c..., dated 1996, states on the final page that the ultimate controller of ICL Pathway (who developed Horizon) was, at this time (1996), indeed Fujitsu.
It wasn't like Fujitsu had bought the company and inherited the liability - they had in fact themselves bid for and won the project - via these intermediaries.
It wasn't like Fujitsu had bought the company and inherited the liability - they had in fact themselves bid for and won the project - via these intermediaries.