Security / Securities - (finance) A tradable financial instrument signifying ownership in financial assets issued by companies or governments. Such financial assets includes but are not restricted to stocks, bonds, futures and debts.

Sell To Open - Opening a position by selling an option contract to a buyer. Learn About All 4 Types Of Option Orders Now!

Selling Climax - Exceptionally heavy volume created when panic-stricken investors dump stocks. Often this marks the end of a bear market and is a spot to buy.

Series - An option contracts on the same underlying stock having the same striking price, expiration date, and unit of trading.

Short (to be short) - To Short means to Sell To Open. That means to write or sell an options contract to a buyer. This gives you the obligation to fulfill the exercise of the option should the buyer decides to do so.

Short Covering - The process of buying back stock that has already been sold short.

Spread Order - An order to simultaneously transact two or more option trades. Typically, one option would be bought while another would simultaneously be sold. Spread orders may be limit orders, not held orders, or orders with discretion. They cannot be stop orders, however. The spread order may be either a debit or credit.

Spread Strategy - Any option position having both long options and short options of the same type on the same underlying security.

Static Hedging - A hedging technique where a hedging trade is established and held without needing to rebalance.

Stock Options - Options contracts with shares as the underlying asset. Read All About Stock Options.

Stock Replacement Strategy - A trading strategy that seeks to reduce risk and volatility through owning deep in the money call options instead of the stock itself and using the remaining cash for hedging. Read All About Stock Replacement Strategy.

Stock Repair Strategy - An options strategy that aims to recover lost value in a stock quickly through writing call options against it. Read All About Stock Repair Strategy.

Stop Limit Order - Similar to a stop order, the stop-limit order becomes a limit order, rather than a market order, when the security trades at the price specified on the stop.

Stop Order - A traditional stop loss method which closes a position when a predetermined price is hit. Read All About Options Orders Here!

Straddle - The purchase or sale of an equal number of puts and calls having the same terms.

Strategy - With respect to option investments, a preconceived, logical plan of position selection and follow-up action.

Strike Arbitrage - An options arbitrage strategy that locks in discrepancies in options pricing between strike prices for a risk-free arbitrage. Read More About Strike Arbitrage.

Strike Price - The price at which the buyer of a call can purchase the stock during the life of the option or the price at which the buyer of a put can sell the stock during the life of the option. Read More About How Stock Options Are Priced.

Structured Warrants- An alternative to stock options which works almost exactly like stock options and traded in markets such as the Singapore market. See how Structured Warrants Are Traded In The Singapore Market.

Support - A term in technical analysis indicating a price area lower than the current price of the stock, where demand is thought to exist. Thus a stock would stop declining when it reached a support area. See also Resistance.

Swing Trading - A trading methodology that trades short term price swings for short term profits. Read more about Options Trading Styles.

Synthetic Position - A combination of stocks and/or options that return the same payoff characteristics of another stock or option position.

Synthetic Put - A security which some brokerage firms offer to their customers. The broker sells stock short and buys a call, while the customer receives the synthetic put. This is not a listed security, but a secondary market is available as long as there is a secondary market in the calls.

Synthetic Stock - An option strategy that is equivalent to the underlying stock. A long call and a short put is synthetic long stock. A long put and a short call is synthetic short stock.

Synthetic Short Straddle - A combination of stocks and call options which produces the same payoff characteristics as a Short Straddle. Read More About Synthetic Short Straddle.

Synthetic Straddle - A combination of stocks and call options which produces the same payoff characteristics as a Long Straddle. Read More About Synthetic Straddle.