How can I register a business as a visitor visa holder?

Yes, you can set up a business while in the U.S. on a business visitor visa but you can not work in that business unless you have a work visa.

Establishing a business and opening a bank account is allowed under the business visitor category. Working or providing services to that company in the United States is not allowed under the business visitor category and would require work authorization.

Anyone can own most types of businesses in the USA. But you cannot be employed by your company until you get a different type of visa. We have helped many clients from Pakistan change to an E-2 Treaty Investor visa.

Yes, you can establish a business in the U.S. without a work-authorized visa.

Yes, you do not need to be a U.S. citizen or permanent resident in order to register a company.

Yes. I suggest setting up a legal entity, applying for an FEIN and then can establish a bank account, enter into a lease in the company name, etc.

You can register a company. But you cannot conduct any business in the U.S. on a visitor visa.