This certainly looks like good practice to me, but it could be undone by insider trading, which could ignore the blue dust supply chain. The article flirts with

This certainly looks like good practice to me, but it could be undone by insider trading, which could ignore the blue dust supply chain. The article flirts with the possibility of there having been insider trading here, but does not seem to come to any definite conclusions. Given the weaker reporting rules of those days, it may be impossible to say.