For every security in our lists, a rationale is provided explaining why it is “tainted”. Our service uses official regulators’ rules to ensure the consistency of our lists. The computed information is also reviewed by a dedicated team of analysts. Ultimately, if you disagree with the information we provide, our service offers you a challenge capability: you send us your challenge and our analysts will review the calculations and provide you quick feedback. We are very cautious when considering securities in scope ; for instance, when a company is sanctioned, in many cases, related securities are “tainted” only after the go-live of the executive order and securities issued before stay out of scope. SSMS is one the best service on the market on this respect.