Although the motivation behind Harry’s large orders is unclear, it could certainly be seen as an attempt to manipulate. This suspicion would be even stronger if the size of the orders were above normal market size. An important question to consider is why is Harry selling?
A considerable number of recent investigations and cases in the markets have focused on actual or attempted manipulation of settlement prices or other benchmarks, such as LIBOR, precious metal and FX fixes and Platts.
If you are unsure, seek guidance from Compliance