or better
An instruction attached to an order requesting price improvement if possible. For example, an order to buy 100 shares of MSFT at $24.23 or better conveys an instruction to buy the shares at $24.23 or lower if possible. A sell order with the or better price improvement instruction means to sell it at a higher price if possible.
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limit on close (LOC)
stop limit order
limit on open (LOO)
investment grade debt instrument
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