Say you had a group of traders, or just 1 trader in a room that had a lot of buying power... Now say I'm long a position. Then I ask everyone/or someone with massive bp to long the stock to increase the price. I don't think this is illegal. Now say you're a small group of traders. You're all long a position. Then you communicate with your buddy that runs a hedge fund and ask him to go long...big. Is this illegal?