options: introduction. derivatives are securities that get their value from the price of other...
TRANSCRIPT
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Options: Introduction
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• Derivatives are securities that get their value from the price of other securities.
• Derivatives are contingent claims because their payoffs depend on the value of other securities.
• Options are traded both on organized exchanges and OTC.
Options
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The Option Contract: Calls
• A call option gives its holder the right to buy an asset:– At the exercise or strike price– On or before the expiration date
• Exercise the option to buy the underlying asset if market value > strike.
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The Option Contract: Puts
• A put option gives its holder the right to sell an asset:– At the exercise or strike price– On or before the expiration date
• Exercise the option to sell the underlying asset if market value < strike.
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The Option Contract
• The purchase price of the option is called the premium.
• Sellers (writers) of options receive premium income.
• If holder exercises the option, the option writer must make (call) or take (put) delivery of the underlying asset.
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Example: Profit and Loss on a Call
• A January 2010 call on IBM with an exercise price of $130 was selling on December 2, 2009, for $2.18.
• The option expires on the third Friday of the month, or January 15, 2010.
• If IBM remains below $130, the call will expire worthless.
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Example: Profit and Loss on a Call
• Suppose IBM sells for $132 on the expiration date.• Option value = stock price-exercise price
$132- $130= $2• Profit = Final value – Original investment
$2.00 - $2.18 = -$0.18• Option will be exercised to offset loss of premium.• Call will not be strictly profitable unless IBM’s price
exceeds $132.18 (strike + premium) by expiration.
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Example: Profit and Loss on a Put
• Consider a January 2010 put on IBM with an exercise price of $130, selling on December 2, 2009, for $4.79.
• Option holder can sell a share of IBM for $130 at any time until January 15.
• If IBM goes above $130, the put is worthless.
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Example: Profit and Loss on a Put
• Suppose IBM’s price at expiration is $123.
• Value at expiration = exercise price – stock price:$130 - $123 = $7
• Investor’s profit:$7.00 - $4.79 = $2.21
• Holding period return = 46.1% over 44 days!
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In the Money - exercise of the option would be profitableCall: exercise price < market pricePut: exercise price > market price
Out of the Money - exercise of the option would not be profitableCall: market price < exercise price.Put: market price > exercise price.
At the Money - exercise price and asset price are equal
Market and Exercise Price Relationships
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American - the option can be exercised at any time before expiration or maturity
European - the option can only be exercised on the expiration or maturity date
• In the U.S., most options are American style, except for currency and stock index options.
American vs. European Options
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Notation
Stock Price = ST Exercise Price = X
Payoff to Call Holder
(ST - X) if ST >X
0 if ST < X
Profit to Call Holder
Payoff - Purchase Price
Payoffs and Profits at Expiration - Calls
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17-13
Payoff to Call Writer
- (ST - X) if ST >X
0 if ST < X
Profit to Call Writer
Payoff + Premium
Payoffs and Profits at Expiration - Calls
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Payoff and Profit to Call Option at Expiration
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Payoff and Profit to Call Writers at Expiration
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Payoffs to Put Holder
0 if ST > X
(X - ST) if ST < X
Profit to Put Holder
Payoff - Premium
Payoffs and Profits at Expiration - Puts
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Payoffs to Put Writer
0 if ST > X
-(X - ST) if ST < X
Profits to Put Writer
Payoff + Premium
Payoffs and Profits at Expiration – Puts
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Payoff and Profit to Put Option at Expiration
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Option versus Stock Investments
• Could a call option strategy be preferable to a direct stock purchase?
• Suppose you think a stock, currently selling for $100, will appreciate.
• A 6-month call costs $10 (contract size is 100 shares).
• You have $10,000 to invest.
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Option versus Stock Investments
• Strategy A: Invest entirely in stock. Buy 100 shares, each selling for $100.
• Strategy B: Invest entirely in at-the-money call options. Buy 1,000 calls, each selling for $10. (This would require 10 contracts, each for 100 shares.)
• Strategy C: Purchase 100 call options for $1,000. Invest your remaining $9,000 in 6-month T-bills, to earn 3% interest. The bills will be worth $9,270 at expiration.
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Option versus Stock Investment
Investment Strategy Investment
Equity only Buy stock @ 100 100 shares $10,000
Options only Buy calls @ 10 1000 options $10,000
Leveraged Buy calls @ 10 100 options $1,000equity Buy T-bills @ 3% $9,000
Yield
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Strategy Payoffs
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Rate of Return to Three Strategies
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Strategy Conclusions
• The figure shows that the all-option portfolio, B, responds more than proportionately to changes in stock value; it is levered.
• Portfolio C, T-bills plus calls, shows the insurance value of options.– C ‘s T-bill position cannot be worth less
than $9270.– Some return potential is sacrificed to limit
downside risk.
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Profit at expiration from buying a call option
ST = X + C0Breakeven
– C0 + ST – X– C0= Profit
ST – X0+CT
– C0– C0– C0
ST > XST < XProfit Table
BUYING A CALL
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Call profit at expiration
IBM Jul 100 call optionStock Price = $96.14
Exercise = $100Call premium = $735
Contract Size 100 shares
Ex = $100
Stock PriceT
Profit
$0
-$735-C0
-C0 + ST – X
B.E.: ST = X + C0
$100 $107.35$92.65
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Writing a naked call
ST = X + C0Breakeven
+C0 – ST + X+C0= Profit
–(ST – X)0– CT
+C0+C0+C0
ST > XST < XProfit Table
WRITING A NAKED CALL
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Writing a naked call
Stock PriceT
Profit
$0
+C0 +C0 – ST + X
XB.E.: ST = X + C0
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Buying a put option
ST = X – P0Breakeven
– P0X – ST – P0= Profit
0X – ST+PT
– P0– P0– P0
ST > XST < XProfit Table
BUYING A PUT
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X – ST – P0
Buying a put optionIBM Dec 100 put optionStock price = $96.14Exercise = $100Put premium = $1,166Contract Size 100 shares
Ex = $100
Stock Pricet
Profit
$0
-$1,166Put
$100$88.34
$8,834
– P0
Short position in
IBM
B.E.: ST = X – P0
$111.66
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Writing a put option
ST = X – P0Breakeven
+P0 ST – X + P0= Profit
0–(X – ST )– PT
+P0+P0+P0
ST > XST < XProfit Table
Writing A Put
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Writing a put option
IBM Jul 100 put optionStock price = $96.14Exercise = $100Put premium = $1,166Contract Size 100 shares
Xx = $100
Stock Pricet
Profit
$0
$1,166
$100 $111.66$88.34
- $8,834
ST – X + P0 +P0
Long Position in IBM
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Buy stocks and at the money puts: Protective Put
All examples that include both stocks and options assume usage of at the money options.
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Buy stocks and at the money puts: Protective Put
Stock Pricet
Profit
$0
Hedged profit equals sum of profits of put and stock at each stock price.
Long position in
IBM Hedged Position
Put
X
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Buy stocks and at the money puts: Protective Put
ST = S0 + P0Breakeven
ST – S0 – P0
ST – S0 + X – ST – P0= Profit
0X – ST+PT
– P0– P0– P0
ST – S0ST – S0ST – S0
ST > XST < XProfit Table
LONG STOCK, LONG PUT
Stock Stock PricePricett
ProfitProfit
$0$0
Protective Protective PutPut
Stock Stock PricePricett
ProfitProfit
$0$0
Protective Protective PutPut
= X – S0 – P0
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Protective Put Conclusions
• Puts can be used as insurance against stock price declines.
• Protective puts lock in a minimum portfolio value.
• The cost of the insurance is the put premium.
• Options can be used for risk management, not just for speculation.
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Covered Calls
• Purchase stock and write calls against it.
• Call writer gives up any stock value above X in return for the initial premium.
• If you planned to sell the stock when the price rises above X anyway, the call imposes “sell discipline.”
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Writing Covered Calls
Stock Pricet
Profit
$0
Long position in
IBM
Written call Covered Call
B.E.:ST = S0 - C0
S0
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Writing Covered Calls
ST = S0 – C0Breakeven
X – S0 + C0ST – S0 + C0= Profit
–(ST – X)0– CT
+C0+C0+C0
ST – S0ST – S0ST – S0
ST > XST < XProfit Table
WRITING COVERED CALLS
Stock Stock PricePricett
ProfitProfit
$0$0 Stock Stock PricePricett
ProfitProfit
$0$0
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Straddle
• Long straddle: Buy call and put with same exercise price and maturity.
• The straddle is a bet on volatility.– To make a profit, the change in stock price
must exceed the cost of both options.– You need a strong change in stock price in
either direction.• The writer of a straddle is betting the
stock price will not change much.
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Straddle
ST = X + C0 + P0ST = X – C0 – P0Breakeven
ST – X – C0 – P0X – ST – C0 – P0= Profit
0X – ST+PT
ST – X0+CT
– P0– P0– P0
– C0– C0– C0
ST > XST < XProfit Table
STRADDLE
Stock Stock PricePrice tt
ProfitProfit
$0$0 Stock Stock PricePrice tt
ProfitProfit
$0$0X – C0 – P0 X + C0 + P0X
Max Loss: C0 + P0
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Value of a Straddle at Expiration
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Strips and Straps
• Strap: buy two calls and one put, more bullish than straddle.
• Strip: buy two puts and one call, more bearish than straddle.
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Spreads
• A spread is a combination of two or more calls (or two or more puts) on the same stock with differing exercise prices or times to maturity.
• Some options are bought, whereas others are sold, or written.
• A bullish spread is a way to profit from stock price increases.
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Bullish Spread
Write (sell) the high exercise price call and buy the low exercise price call. All other option terms identical. L=low exercise price, H=high exercise price
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Bullish Spread
+ST = XL + C0L – C0H–Breakeven
XH – XL – C0L + C0HST – XL – C0L +C0HC0H – C0L= Profit
–(ST – XH )00– CTH
ST – XLST – XL0+CTL
+C0H+C0H+C0H+C0H
– C0L– C0L– C0L– C0L
ST > XHXL < ST < XHST < XLProfit Table
BULLISH PRICE SPREAD
Stock Pricet
Profit
XL
XH
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Value of a Bullish Spread Position at Expiration
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Collars• A collar is an options strategy that brackets
the value of a portfolio between two bounds.• Limit downside risk by sacrificing upside
potential.• Buy a protective put to limit downside risk of a
position. • Fund put purchase by writing a covered call.
– Net outlay for options is approximately zero.
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Warnings about options positions
• Options can move 10-15% or more in a very short time period.
• Options are by definition short term instruments; an investor can ride out bad times in spot markets but not in options.– The limited loss feature makes options appear safer than
they are.– You have to compare equal $ investments in stocks and
options to really see the higher risk of the option position.
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Warnings about options positions
What’s wrong with selling options?• Covered calls (writing calls against stock you
own)– The investor never gets the occasional
large stock price run up and suffers most of the loss of a big price drop.Eliminates any positive skewness of stock returns
• Naked calls (writing calls when you do not own the stock)– Maximum gain is limited to call premium but
unlimited loss, poor strategy in volatile markets
Stock Stock PricePricett
ProfitProfit
$0$0 Stock Stock PricePricett
ProfitProfit
$0$0
Stock Stock PricePricett
ProfitProfit
$0$0 Stock Stock PricePricett
ProfitProfit
$0$0
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• The call-plus-bond portfolio (on left) must cost the same as the stock-plus-put portfolio (on right):
Put-Call Parity
0(1 )Tf
XC S P
r
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Stock Price = 110 Call Price = 17Put Price = 5 Risk Free = 5%Maturity = 1 yr X = 105
117 > 115Since the leveraged equity is less expensive,
acquire the low cost alternative and sell the high cost alternative
Put Call Parity - Disequilibrium Example
0(1 )Tf
XC S P
r
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Table: Arbitrage Strategy
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Problem 1
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Problem 3
Breakeven
= Profit
+PT
– P0
ST – $1,200
Profit TableJoe’s Protective Put Strategy
Breakeven
= Profit
+PT
– P0
ST – $1,200
Profit TableSally’s Protective Put Strategy