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Used in the context of general equities. Sizable block of securities or commodities contracts that, if released on the market, would put downward pressure on prices; prohibits buying activity that would otherwise translate into upward price movement. Examples include shares held in a dealer's inventory, a large institutional holding, a secondary distribution still in registration, and a large commodity position about to be liquidated.
Shares in a security or commodity contracts that are likely to be sold in certain circumstances, creating downward pressure on the price. That is, the market overhang supply is a block that investors are holding but will likely attempt to sell. For example, if a security hits its resistance level, more investors are likely to sell their shares which increases the number of shares available on the market and, assuming demand does not increase, will lead to a decline in the price. Market overhang is also called the overhanging supply or simply the overhang.