I don't think such calculation would make much sen

I don't think such calculation would make much sense to be fair. I do not know exactly what is happening right now but we are below the offering price since Friday's opening, so it is unlikely that we are just seeing something as simple as one of the new investors just dumping its shares. Besides, daily volume does not mean that only new shares are concerned. And even then, if we have day traders, the "same" share can be counted several times through several transactions.