question about Halo 4 music Copyright

I have a Short question about the Copyright from the halo 4 soundtrack.

I arrange/Transcribe Sheet music from Halo i have done all the halo soundtrack´s. But you have to put (copyright / owner ) on the paper, normally I wrote Bungie studio,s or just Bungie and Microsoft Game studio´s

And now i have Transcribed The music from Working at 343 and Arrival but since 343I is microsoft do i need to put both on ? or does Neil own all the work ?

try writing to ms studios or 343 Im sure they will send the letter right to Neil.