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You can submit a request to change the address at https://customerportal.solidworks.com
I set mine to my personal email.
I didn't register a s/n so I don't have access to a lot of the features the customer portal offers.
However, I have a second login tied to my company s/n that I use to gain access to the customer portal features.
When you request the change as Kenneth mentioned (in your profile on the Customer Portal), they should be able to keep your contact and update the information. Your information about your old company would no longer follow you.