No, your personal information unrelated to the e-submission on CORENET 2.0 will not be shared with the entity that you are transacting on behalf of. Your Singpass is only used as a secure login and user authentication mechanism to verify the identity of individual users before accessing CORENET 2.0 services.
By logging in to CORENET 2.0 using your Singpass, the Corppass Administrator and Sub-Administrator of the entity will only be able to identify that it was you who transacted on behalf of the company for that corporate transaction. No further personal information is accessible without your consent.