how do you factory reset an ipad that has a company lock on it?

The party holding the Activation Lock is the only entity that can release that lock, absent some purchasing information that you very likely lack access to.

If the party holding the Activation Lock is willing to release the lock, here is what they need to do:

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

If the party holding the Activation Lock is not willing to remove it, return it for a refund, or recycle it.

I don't know what you mean by company lock. If it is managed by a company then ask the company's IT department to reset it.

What do you mean by "company lock"?

If you mean you're getting a message that it's 'managed by' a company, you have a stolen device.

Take it back to where you got it or hand it over to the police.