>Who owned the SpaceX payload?
Northrup Grumman was the DEFCON that constructed it, SpaceX launched it.
qz.com/1175393/zuma-satellite-did-elon-musks-spacex-or-northrup-grumman-mess-up-a-secret-us-launch/
Classified AFAIK, but reasonable to assume it is whatever agency paid Northrop Grumman to build it.