The military does a lot of training and exercises off the coast near Los Angeles, and those aircraft are most likely "aggressor"/target aircraft. See, e.g., https://defpost.com/atac-hawker-hunter-aggressor-aircraft-cr...

Their ownership is obscured via the TVPX trust company, but they're really operated by Airborne Tactical Advantage Company (ATAC): https://atacusa.com/

This sort of training happens all the time, and you get used to seeing lots of aircraft circling around over the ocean in southern California.

Edit: Right now in that area I see aircraft from at least two other contractors that do threat simulation for military training, plus an unknown military aircraft. Sometimes you can check the AIS tracking sites and see military ships in the area, too.