
In options trading, a vertical spread is an options strategy involving buying and selling of multiple options of the same underlying security, same expiration date, but at different strike prices. They can be created with either all calls or all puts. The term originates from the trading sheets that were used in the open outcry pits on which optio...
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http://en.wikipedia.org/wiki/Vertical_spread

Simultaneous purchase and sale of two options that differ only in their exercise price. See: Horizontal spread.
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http://www.duke.edu/~charvey/Classes/wpg/bfglosv.htm

Simultaneous purchase and sale of two options that differ only in their exercise price. See: horizontal spread.
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http://www.encyclo.co.uk/local/20047

When one firm acquires another firm that is in the same industry but at another stage in the product
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http://www.encyclo.co.uk/local/22402
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