Manipulating Devices
MAM-3.10.33
Advancing the Bid: Increasing the bid for a security to increase its price artificially, creating the impression of strength or the illusion that stock activity was causing the increase.
November 2010MAM-3.10.34
Placing Orders without Intention to Execute: This involves the entering of orders, especially into electronic trading systems, which are higher/lower than the previous bid/offer. The intention is not to execute the order but to give a misleading impression that there is demand for or supply of the security at that price. The orders are then withdrawn from the market before they are executed. (A variant on this type of market manipulation is to place a small order to move the bid/offer price of the security and being prepared for that order to be executed if it cannot be withdrawn in time.) These manipulative orders are entered in the pre-open sessions and also during the normal trading sessions.
November 2010MAM-3.10.35
Excessive Bid-ask Spreads: This conduct is carried out by intermediaries which have market power, such as specialists or market makers acting in cooperation, in such a way intentionally to move the bid-ask spread to and/or to maintain it at artificial levels and far from fair values, by abusing their market power, i.e. the absence of other competitors.
November 2010
