Our policy does not permit one person to hold multiple accounts without expressed written permission from Shutterstock.
Since each person or entity can only own one portfolio, a second account would be permissible if it is registered under the name of a different entity, with its own copyrighted material.
If you also own a company, you would be allowed to have one personal account under your name and one business account under the company name. You may not share content between the two accounts, each account must have its own owner with its own content.
Learn more about registering as a business: Can I register for a contributor account as a business?