Thomas Cook has a market capitalisation of 1.8 bn pounds. A trade for 6m pounds is nothing that surprising after a major news announcement - possibly an institutional investor like a fund manager or a hedge fund taking a punt on the company's future.
If a £6m trade was considered highly unusual, the share price would start jumping around to reflect the possibility of a secret buyer of stock. The share price over the last week has barely moved
When a new investor appears on the shareholders register holding 3% or more of the company's equity, then it's more of a conversation piece...