Given acquisitions, the current IP ownership is more like:
IBM - AIX
HPE - ULTRIX, Tru64/OSF1/DIGITAL UNIX, HP-UX, IRIX
Apple - A/UX, macOS
Oracle - SunOS, Solaris
IBM - AIX
HPE - ULTRIX, Tru64/OSF1/DIGITAL UNIX, HP-UX, IRIX
Apple - A/UX, macOS
Oracle - SunOS, Solaris
Hackers at HP/Apollo (the former Apollo Computers which was swallowed by HP in 1989) have been heard to complain that Mr. Packard should have pushed to have his name first, if for no other reason than the greater eloquence of the resulting acronym.