By default you’re legally able to share it. It’s your data, you’re telling someone how much you paid for something.
Something can’t be a trade secret if it’s not a secret at all, and if you’re the seller, and the information is a description of something someone else did (ie how much the buyer paid) then it’s not your secret to defend.
There's a big difference between seeing data in the course of your job, and being legally able to share it!