Ensemble Pump & Dump
Also known as ={orange}Predatory Cohort=
Note
Also known as morning pump, afternoon dump This is a variation of pump & dump since it uses a group of investors, not a single one. Similar to the GameStop short sqeeze but not the same.
Find a low volume stock and pick a time when the market is quiet.
Buy X + Short X
Price goes up
Sell X
Price goes down,
loss on sales,
profit on shorts
Buy more X
Refinement: check for price sensitivity of stock
This phenomenon occurs naturally with BTC at opening of US markets and has been used by Jane Street in 2025. Could also be due to delta hedging as portfolios are rebalanced at market opening. Jane Street used IBIT ETF for this. They could easily do this because there are an AP and could create and destroy ETF shares at will. Did not get noticed because they only have to report long positions not shorts.
