RE: Ian King Live7 Oct 2020 11:50
If someone wanted to sell 10M shares, they could opt to do this via an Iceberg order where they only ever show the "tip" of the order on level II, such to avoid buyers suddenly seeing a sell wall of 10M shares, so only a peak of the order is ever shown, then once fulfilled the order can be printed (anecdotally this is usually displayed after hours). Look into it yourself too, as that's my best explanation and might not be 100%