My suggestion would be to use the search function in your email. Maybe the confirmation email or something else referencing the company is still there somewhere. Otherwise you will just have to log into all your companies. Even though I'm registered with over 150, I normally only work with 30 to 40 at a given time. You should be able to narrow it down that much.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.