Off the top of my head Menzies handle...
Easyjet, Jet2 (below wing), TAP, Iberia, BA, Icelandair, Aer Arran, AA (below wing), Aurigny, Germanwings and maybe a few others. However, it's well known that Menzies undercut the other handling agents at MAN (and possibly other stations) by a huge percentage so whether they are running at a profit or not is anyones guess