Sony owns the logo, but, like CD and SACD, it was developed with Philips.
Contributing to the development of the format were/are Matsushita, Pioneer, Thomson, LG Electronics, Hitachi, Sharp and Samsung.
The current Board of Directors is comprised of:
Twentieth Century Fox
There are even more companies that have their fingers in the royalty pie, for example even Microsoft for part of VC1 (one of the codecs used). WHen you buy a Blu Ray player, part of the money you hand over goes to all different companies
Sony does not "own" Blu-ray.