TSA Terms and Conditions state services must be provided by TSA-approved contractors. Is there a list of approved contractors?

The TSA Terms and Conditions for Acceptable Capability requires that services be provided by a TSA-approved contractor and coordinated with an authorized Government representative.  Is there a list of these TSA-approved contractors? 

Please reach out to the APM CAP team to discuss the contractors that can be used for a specific Capability.