More than 25 brands at the Westfield Stratford City complex are receiving their retail security from SECOM.
The company has installed a range of security solutions across the 1.9 million sq ft site, ranging from CCTV systems to intruder alarms.
One of the brands making the most of SECOM's expertise is Forever 21, which has been working with the security company ever since it set up operations in the UK.
It has installed security systems in Forever 21's Dublin, Birmingham and Oxford Street stores and has now been awarded the contract at Westfield Stratford City.
Tommy Pooke, SECOM's national account executive, said: "It is refreshing to see that when it comes down to proving our commitment to quality of service we can deliver and not only work with our customers but grow with them."
He revealed that the security solutions required by Forever 21 can often consist of up to 60 cameras in one CCTV system.