Despite a further 100 roles linked to public sector contracts being safeguarded, a spokesperson for the OR said 452 people will lose their jobs.
The posts cover a variety of roles connected with private and public contracts across different parts of the country, as well as back-office functions.
Last week, the OR revealed the roles of 919 former Carillion employees had been secured, while 377 other staff will be made redundant.
A spokesperson said: "As part of the ongoing liquidation of the Carillion group, we have reviewed additional public and private sector contracts, as well as core divisions of the business.
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"We can confirm that we have safeguarded a further 100 jobs and these roles are linked to public sector contracts. Most staff will be transferring on existing or similar terms, something I will continue to facilitate wherever possible as we work to find new providers for Carillion's remaining contracts.
"Unfortunately, 452 posts are being made redundant. They cover a variety of roles connected with private and public contracts across different parts of the country, as well as back-office functions.
"We appreciate this will be a difficult time for those who have lost their jobs. Jobcentre Plus' Rapid Response Service stands ready to support any of these employees by providing advice and information so people can move into a new job as quickly as possible. People who have been made redundant will also be entitled to make a claim for statutory redundancy payments.
"Our efforts are focused on the smooth transfer of Carillion's contracts to new providers and we will continue to keep Carillion's workforce updated as these arrangements are finalised."
(LM/MH)
