I'm setting up a 4th Edition campaign in central NA and I'm using a city of my own modification. It involves a lot of highly delineated Megacorp territories and not a lot of overlapping police coverage because Megacorps don't like other people treading their lawn. However, besides Lone Star being "the general police goonies" that I'm not using, these are the only security companies I've been able to dig up:
AAA megacorps:
Ares - Knights Errant, Hard Corps
Aztechnology - Aztechnology Corporate Security (I also created "Toltec" for use in areas near but not actually in corp extraterritorial space)
Evo - Ivanoven
Horizon - Event Horizon (might be their high threat response unit, not sure)
Mitsuhama - Petrovski Security, Parashield
Neonet - Minuteman Security (the phone police are after you)
Renraku - Red Samurai, Securitech International
Saeder-Krupp - ProSecuritas, Sternenschutz (though whether these are internal or used outside SK megaplexes is unknown). They also have Saeder-Krupp Prime, though this is likely counterintelligence or a high-threat-response unit.
Shiawase - Desert Storm Security (though this seems limited to desert regions. Maybe Near East, if I remember my colloquialisms correctly)
Wuxing - ?*
AA megacorps:
Yakashima - Sakura Security (likely heavily involved in their naval pirac...protection)
Non-Megacorp:
Pueblo Security Enterprises Inc
Sioux - Eagle Security, often contracted outside Lakota territory and a frequent competitor for Lone Star in North America
Wolverine Security - primarily North American gun-happy "anti-terrorist" corp
*=I found "Wuyan" somewhere, but now I can't dig up the reference so I'm not sure if it was canon or a convenient misread reference. If I don't remember incorrectly, they deal with services including magic/astral security.
Is there anything that the rest of you have, either in terms of canon materials or roughly "fanon" consensus?