There is no one answer to this question as it depends on the specific credit report company and how they collect and use your credit information. Generally speaking, most credit report companies require a signed contract in order to run your credit report, so it's likely that you won't be able to do this without knowing about it. If you're concerned about someone running your credit report without your knowledge, it's best to speak to your credit score provider and see if there is any way to control or remove their access to your credit report.