Definition of Option-adjusted spread (OAS)

Option-adjusted spread (OAS)

1) The spread over an issuer's spot rate curve, developed as a measure of
the yield spread that can be used to convert dollar differences between theoretical value and market price.
2) The cost of the implied call embedded in a MBS, defined as additional basis-yield spread. When added to the
base yield spread of an MBS without an operative call produces the option-adjusted spread.

Abandonment option

The option of terminating an investment earlier than originally planned.

Adjusted present value (APV)

The net present value analysis of an asset if financed solely by equity
(present value of un-levered cash flows), plus the present value of any financing decisions (levered cash
flows). In other words, the various tax shields provided by the deductibility of interest and the benefits of
other investment tax credits are calculated separately. This analysis is often used for highly leveraged
transactions such as a leverage buy-out.

American option

An option that may be exercised at any time up to and including the expiration date.
Related: European option

American-style option

An option contract that can be exercised at any time between the date of purchase and
the expiration date. Most exchange-traded options are American style.

Arbitrage-free option-pricing models

Yield curve option-pricing models.

Asian option

option based on the average price of the asset during the life of the option.

Bargain-purchase-price option

Gives the lessee the option to purchase the asset at a price below fair market
value when the lease expires.

Barrier options

Contracts with trigger points that, when crossed, automatically generate buying or selling of
other options. These are very exotic options.

Basket options

Packages that involve the exchange of more than two currencies against a base currency at
expiration. The basket option buyer purchases the right, but not the obligation, to receive designated
currencies in exchange for a base currency, either at the prevailing spot market rate or at a prearranged rate of
exchange. A basket option is generally used by multinational corporations with multicurrency cash flows
since it is generally cheaper to buy an option on a basket of currencies than to buy individual options on each
of the currencies that make up the basket.

Binomial option pricing model

An option pricing model in which the underlying asset can take on only two
possible, discrete values in the next time period for each value that it can take on in the preceding time period.

Black-Scholes option-pricing model

A model for pricing call options based on arbitrage arguments that uses
the stock price, the exercise price, the risk-free interest rate, the time to expiration, and the standard deviation
of the stock return.

Bull spread

A spread strategy in which an investor buys an out-of-the-money put option, financing it by
selling an out-of-the money call option on the same underlying.

Call an option

To exercise a call option.

Call option

An option contract that gives its holder the right (but not the obligation) to purchase a specified
number of shares of the underlying stock at the given strike price, on or before the expiration date of the
contract.
Call premium
Premium in price above the par value of a bond or share of preferred stock that must be paid to
holders to redeem the bond or share of preferred stock before its scheduled maturity date.

Compound option

option on an option.

Covered or hedge option strategies

Strategies that involve a position in an option as well as a position in the
underlying stock, designed so that one position will help offset any unfavorable price movement in the other,
including covered call writing and protective put buying. Related: naked strategies

Credit spread

Related:Quality spread

Currency option

An option to buy or sell a foreign currency.

Dealer options

Over-the-counter options, such as those offered by government and mortgage-backed
securities dealers.

Delivery options

The options available to the seller of an interest rate futures contract, including the quality
option, the timing option, and the wild card option. Delivery options make the buyer uncertain of which
Treasury Bond will be delivered or when it will be delivered.

Doubling option

A sinking fund provision that may allow repurchase of twice the required number of bonds
at the sinking fund call price.

Down-and-in option

Barrier option that comes into existence if asset price hits a barrier.

Down-and-out option

Barrier option that expires if asset price hits a barrier.

Effective spread

The gross underwriting spread adjusted for the impact of the announcement of the common
stock offering on the firm's share price.

Elasticity of an option

Percentage change in the value of an option given a 1% change in the value of the
option's underlying stock.

Embedded option

An option that is part of the structure of a bond that provides either the bondholder or
issuer the right to take some action against the other party, as opposed to a bare option, which trades
separately from any underlying security.

Equity options

Securities that give the holder the right to buy or sell a specified number of shares of stock, at
a specified price for a certain (limited) time period. Typically one option equals 100 shares of stock.

European option

option that may be exercised only at the expiration date. Related: american option.

European-style option

An option contract that can only be exercised on the expiration date.

Exercising the option

The act buying or selling the underlying asset via the option contract.

Foreign currency option

An option that conveys the right to buy or sell a specified amount of foreign
currency at a specified price within a specified time period.

Futures option

An option on a futures contract. Related: options on physicals.

Garmen-Kohlhagen option pricing model

A widely used model for pricing foreign currency options.

Greenshoe option

option that allows the underwriter for a new issue to buy and resell additional shares.

Gross spread

The fraction of the gross proceeds of an underwritten securities offering that is paid as
compensation to the underwriters of the offering.

Horizontal spread

The simultaneous purchase and sale of two options that differ only in their exercise date.

Index and Option Market (IOM)

A division of the CME established in 1982 for trading stock index
products and options. Related: Chicago Mercantile Exchange (CME).

Index option

A call or put option based on a stock market index.

Intermarket spread swaps

An exchange of one bond for another based on the manager's projection of a
realignment of spreads between sectors of the bond market.

Intramarket sector spread

The spread between two issues of the same maturity within a market sector. For
instance, the difference in interest rates offered for five-year industrial corporate bonds and five-year utility
corporate bonds.

Intrinsic value of an option

The amount by which an option is in-the-money. An option which is not in-themoney
has no intrinsic value. Related: in-the-money.

Irrational call option

The implied call imbedded in the MBS. Identified as irrational because the call is
sometimes not exercised when it is in the money (interest rates are below the threshold to refinance).
Sometimes exercised when not in the money (home sold without regard to the relative level of interest rates).

Liquid yield option note (LYON)

Zero-coupon, callable, putable, convertible bond invented by Merrill

Lookback option

An option that allows the buyer to choose as the option strike price any price of the
underlying asset that has occurred during the life of the option. If a call, the buyer will choose the minimal
price, whereas if a put, the buyer will choose the maximum price. This option will always be in the money.

Liquid yield option note (LYON)

Zero-coupon, callable, putable, convertible bond invented by Merrill Lynch & Co.

Margin requirement (Options)

The amount of cash an uncovered (naked) option writer is required to
deposit and maintain to cover his daily position valuation and reasonably foreseeable intra-day price changes.

Maturity spread

The spread between any two maturity sectors of the bond market.

Multi-option financing facility

A syndicated confirmed credit line with attached options.

Naked option strategies

An unhedged strategy making exclusive use of one of the following: Long call
strategy (buying call options ), short call strategy (selling or writing call options), Long put strategy (buying
put options ), and short put strategy (selling or writing put options). By themselves, these positions are called
naked strategies because they do not involve an offsetting or risk-reducing position in another option or the
underlying security.
Related: covered option strategies.

Net adjusted present value

The adjusted present value minus the initial cost of an investment.

Option

Gives the buyer the right, but not the obligation, to buy or sell an asset at a set price on or before a
given date. Investors, not companies, issue options. Investors who purchase call options bet the stock will be
worth more than the price set by the option (the strike price), plus the price they paid for the option itself.
Buyers of put options bet the stock's price will go down below the price set by the option. An option is part of
a class of securities called derivatives, so named because these securities derive their value from the worth of
an underlying investment.

Option elasticity

The percentage increase in an option's value given a 1% change in the value of the
underlying security.

Option not to deliver

In the mortgage pipeline, an additional hedge placed in tandem with the forward or
substitute sale.

Option premium

The option price.

Option price

Also called the option premium, the price paid by the buyer of the options contract for the right
to buy or sell a security at a specified price in the future.

Option seller

Also called the option writer , the party who grants a right to trade a security at a given price in
the future.

Option writer

option seller.

Options contract

A contract that, in exchange for the option price, gives the option buyer the right, but not
the obligation, to buy (or sell) a financial asset at the exercise price from (or to) the option seller within a
specified time period, or on a specified date (expiration date).

Options contract multiple

A constant, set at $100, which when multiplied by the cash index value gives the
dollar value of the stock index underlying an option. That is, dollar value of the underlying stock index = cash
index value x $100 (the options contract multiple).

Options on physicals

Interest rate options written on fixed-income securities, as opposed to those written on
interest rate futures contracts.

Out-of-the-money option

A call option is out-of-the-money if the strike price is greater than the market price
of the underlying security. A put option is out-of-the-money if the strike price is less than the market price of
the underlying security.

Path dependent option

An option whose value depends on the sequence of prices of the underlying asset
rather than just the final price of the asset.

Postponement option

The option of postponing a project without eliminating the possibility of undertaking it.

Put an option

To exercise a put option.

Put option

This security gives investors the right to sell (or put) fixed number of shares at a fixed price within
a given time frame. An investor, for example, might wish to have the right to sell shares of a stock at a certain
price by a certain time in order to protect, or hedge, an existing investment.

Quality option

Also called the swap option, the seller's choice of deliverables in Treasury Bond and Treasury
note futures contract. Related: cheapest to deliver issue

Quality spread

Also called credit spread, the spread between Treasury securities and non-Treasury securities
that are identical in all respects except for quality rating. For instance, the difference between yields on
Treasuries and those on single A-rated industrial bonds.

Relative yield spread

The ratio of the yield spread to the yield level.

Risk-adjusted profitability

A probability used to determine a "sure" expected value (sometimes called a
certainty equivalent) that would be equivalent to the actual risky expected value.

Risk-adjusted

return Return earned on an asset normalized for the amount of risk associated with that asset.

Split-fee option

An option on an option. The buyer generally executes the split fee with first an initial fee,
with a window period at the end of which upon payment of a second fee the original terms of the option may
be extended to a later predetermined final notification date.

Spread

1) The gap between bid and ask prices of a stock or other security.
2) The simultaneous purchase and sale of separate futures or options contracts for the same commodity for delivery in different months.
Also known as a straddle.
3) Difference between the price at which an underwriter buys an issue from a firm
and the price at which the underwriter sells it to the public.
4) The price an issuer pays above a benchmark fixed-income yield to borrow money.

Spread income

Also called margin income, the difference between income and cost. For a depository
institution, the difference between the assets it invests in (loans and securities) and the cost of its funds
(deposits and other sources).

Spread strategy

A strategy that involves a position in one or more options so that the cost of buying an
option is funded entirely or in part by selling another option in the same underlying. Also called spreading.

Spreadsheet

A computer program that organizes numerical data into rows and columns on a terminal screen,
for calculating and making adjustments based on new data.

Stock index option

An option in which the underlying is a common stock index.

Stock option

An option in which the underlying is the common stock of a corporation.

Tax deferral option

The feature of the U.S. Internal Revenue Code that the capital gains tax on an asset is
payable only when the gain is realized by selling the asset.

Tax-timing option

The option to sell an asset and claim a loss for tax purposes or not to sell the asset and
defer the capital gains tax.

TED spread

Difference between U.S. Treasury bill rate and eurodollar rate; used by some traders as a
measure of investor/trader anxiety.

Time value of an option

The portion of an option's premium that is based on the amount of time remaining
until the expiration date of the option contract, and that the underlying components that determine the value of
the option may change during that time. Time value is generally equal to the difference between the premium
and the intrinsic value. Related: in-the-money.

Timing option

For a Treasury Bond or note futures contract, the seller's choice of when in the delivery month to deliver.

Two-state option pricing model

An option pricing model in which the underlying asset can take on only two
possible (discrete) values in the next time period for each value it can take on in the preceding time period.
Also called the binomial option pricing model.

Vertical spread

Simultaneous purchase and sale of two options that differ only in their exercise price. See:
horizontal spread.

Virtual currency option

A new option contract introduced by the PHLX in 1994 that is settled in US$ rather
than in the underlying currency. These options are also called 3-Ds (dollar denominated delivery).

Wild card option

The right of the seller of a Treasury Bond futures contract to give notice of intent to deliver
at or before 8:00 p.m. Chicago time after the closing of the exchange (3:15 p.m. Chicago time) when the
futures settlement price has been fixed. Related: Timing option.

Yield curve option-pricing models

Models that can incorporate different volatility assumptions along the
yield curve, such as the Black-Derman-Toy model. Also called arbitrage-free option-pricing models.

Yield spread strategies

Strategies that involve positioning a portfolio to capitalize on expected changes in
yield spreads between sectors of the bond market.

Call Option

A contract that gives the holder the right to buy an asset for a
specified price on or before a given expiration (maturity) date

Option

See call option and put option

Put Option

A contract that gives the holder the right to sell an asset for a
specified price on or before a given expiration (maturity) date

cafeteria plan a “menu” of fringe benefit options that include

cash or nontaxable benefits

risk-adjusted discount rate method

a formal method of adjusting for risk in which the decision maker increases the rate used for discounting the future cash flows to compensate for increased risk

stock option

a right allowing the holder to purchase shares of common stock during some future time frame and at a specified price

American option

An option that can be exercised any time until its
expiration date. Contrast with European option.

European option

An option that can be exercised only on its expiration date.
Contrast with American option.

Option

A right to buy or sell specific securities or commodities at a stated
price (exercise or strike price) within a specified time. An option is a type of
derivative.

Spread

For options, a combination of call or put options on the same stock
with differing exercise prices or maturity dates.

Stock option

A right to purchase a specific maximum number of shares at a specific
price no later than a specific date. It is a commonly used form of incentive compensation.

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