Occam was awarded the accreditation following an independent external audit conducted by the British Standards Institute (BSI).
The eight-month process involved a comprehensive review of all the company's internal processes and management controls.
In becoming fully certified, Occam has become one of a select group of companies in the UK to achieve the accreditation across the whole organisation.
The ISO 27001 is the only auditable international standard which defines the requirements for an Information Security Management System (ISMS).
The standard is designed to ensure the selection of adequate and proportionate security controls, while independently verifying that organisational risks are properly identified, assessed and managed.
To maintain the certificate, Occam's information security management system will be reviewed, monitored and audited on a regular basis.
Scott Logie, strategy director at Occam, said: "We recognise and understand that the security of our clients' data is of paramount importance.
"With this independent accreditation, our clients can be confident that we have the necessary measures and internal procedures in place to protect their data and minimise any potential security risks."