G4S shareholders have approved Allied Universal’s takeover bid, creating the world’s largest private security firm with more than 750,000 security officers, after around 80 per cent of the London-based company’s shareholders approved the $US5.28 billion transaction.

“The combination of G4S and Allied Universal creates the global leader in security with revenues of over $18 billion, industry leading talent and expertise and unmatched market coverage,” G4S CEO Ashley Almanza said. “This unique combination will offer customers exceptional service and provides employees with an exciting future.”

Allied Universal is a security and facilities manager with more than 200,000 staff and $US8.5 billion in revenue. It operates across North America, with a presence in the U.S., Canada and Mexico. It also has an international base in the United Kingdom, where it employs more than 700 people.