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Opening Purchase
A transaction in which the purchaser’s intention is to create or increase a long position in a given series of binary options.

Opening Sale
A transaction in which the seller’s intention is to create or increase a short position in a given series of binary options.

Opening Transaction
A trade which creates a new position in an asset for an investor. An opening buy transaction creates a new long asset position to the account. An opening sell transaction creates a new short position in the asset.  See also Closing Transaction.

Open Interest
The number of outstanding binary option contracts in the exchange market or in a particular class or series.

Option Pricing Curve
A graphical representation of the projected price of a binary option against underlying price at a fixed point in time. The curve is generated by using a mathematical model. The delta (or hedge ratio) is the slope of a tangent line to the curve at a fixed stock price.  See also Model.

Out-of-the-money
A binary call option is out-of-the-money if the strike price is greater than the underlying asset price. A put option is out-of-the-money if the strike price is less than the underlying asset price.

Over
A binary call option that always has the strike price equal to the prevailing asset price. This means that wherever the underlying asset price moves to, a new strike price is immediately and dynamically created. See also Under

Over-the-Counter Option (OTC)
An option traded off-exchange, as opposed to a listed stock option. The OTC option has a direct link between buyer and seller, has no secondary market, and has no standardisation of strike prices and expiration dates.

Overvalued
Describing a security trading at a higher price than it logically should. Normally associated with the results of option price predictions by mathematical models. If an option is trading in the market for a higher price than the model indicates, the option is said to be overvalued.  See also Fair Value and Undervalued.