One of the most important things to understand in options trading is delta.

Too many people focus on cost when selecting their options with very little regard to the delta.

But it's the delta that will tell you how much your option will move if the stock goes up (or down).

Pretty important. But not enough is said about it.

And that's why I'm writing about it today.

Definition:

The definition of delta as it applies to options is: the percentage an option will increase or decrease in value in relation to the price movement of the underlying stock.

Example:

For example: a delta of .60 or 60% means the option will move or change in value equal to 60% of the underlying stock's price change, which means a \$1.00 rise in the stock should see a 60 cent rise in the option premium. If the stock fell by -\$1.00, the option should decrease by -60 cents.

Note: the delta will change (either increase or decrease), in general, based on how 'in-the- money' or 'out-of-the-money' your option becomes.

For instance: let's say a stock is trading at \$85 and you had a \$95 out-of-the-money call option with 4 months of time on it; that option might have a delta of .41 or 41%. Let's also say that the option was priced at 6.00 or \$600.

Now let's say the stock increased by \$10. This means the out-of-the-money call option with a delta of 41% would've increased by \$4.10 or \$410.

Now, that option is at-the-money.

Remember, the option's delta will increase or decrease based on how 'in-the-money' or 'out-of-the-money' the option becomes.

So now your option is at-the-money. Instead of your delta being 41%, it might now be 60%. If the stock were to then increase another \$10, that option would now increase by another 60% (60% of the \$10 move) or \$6, i.e., \$600.

And as the price goes up, and the more your option gets 'in-the-money', the bigger your delta will become until it gets to be 100%.

Likewise, the further 'out-of-the-money' the option gets, the smaller the delta becomes.

So when you're deciding what option to buy or sell, look at the delta so you can get an idea as to how much your option will increase or decrease based on the underlying price of the stock.

Knowing your option's delta is one of the keys to profitable options trading.

And be sure to check out our Zacks Options Trader.

Disclosure: Officers, directors and/or employees of Zacks Investment Research may own or have sold short securities and/or hold long and/or short positions in options that are mentioned in this material. An affiliated investment advisory firm may own or have sold short securities and/or hold long and/or short positions in options that are mentioned in this material.

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