He previously held senior roles at Nomura Securities Co, the brokerage unit of Nomura Holdings Inc. After he left Nomura, Saito served as CEO of the Industrial Revitalization Corporation of Japan, a now-defunct state-backed turnaround fund that invested in troubled companies.
In the context of the input sentence, determine the relationship between 'Nomura Securities' and 'Nomura Holdings'.
Options: platform, owned by, headquarters location, parent organization