
Umbrella Corporation: A pharmaceutical company that also maintains its own private military forces like the U.S.S. and U.B.C.S. They're in a partnership with the U.S. Department of Defense.

Abstergo: A high-tech, pharma, and entertainment giant. Famous for their Animus VR platform and they have a private army called the Sigma Team.

Arasaka: A massive corp involved in finance, security, manufacturing, and defense. They have a heavily armed private security force.

Aperture Science: A physics research company. They own the Portal Gun and super AIs, and they operate various sentry guns known as 'Turrets'.

Vault-Tec: A company that builds fallout shelters for nuclear war. They actually own nuclear missiles just to market their Vaults. Absolutely cracked.
"Gamers are debating which mega-corp is the most terrifying, with Arasaka and Vault-Tec being top contenders for 'most evil.'"
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