Quote from ML_QUANT:
forrestang, following up on the pump & dump discussionâ¦.as you know when an entity needs to sell a very huge lot of shares/contracts that is big enough to move the market, they avoid going directly to the sell side and rather they place their sell orders at well higher than the market and then start buying pushing the market up until it eventually it hits their sell orders. This action of them leaves an evidence behind that can be picked up. Usually this is done when youâd think the market is going to sell off or at a weak support level.
HTH