it tracks whatever it is and -- >> there's two issues here, one is, with steve ballmer in particular, of shell, for example, and then buying another class of share of shell afterwards. >> yes let's start there. because that's the same company. >> right >> is that illegal >> so the only thing that is legal is same stock, same account, right that's what it is. that's all that is enforced. >> from a tax -- then the question becomes, from a tax policy perspective, if you're the government, the irs, do we believe that class "a" shares are the same as class "b" shares that's the most obvious version of this. >> when we noticed this, when i saw, hey, steve ballmer is buying shell, selling shell, that seems like the same thing they're different classes. we brought this to goldman sachs and said, hey, we're seeing hundreds of these types of trades it's not just shell. it's other companies and they said basically, whoops, we didn't mean to be doing that. this goes back ten years they told us, they're notifying clients, they're unwinding these trades steve ballmer said he's going to amend his ta