Lesson 10: Options Terminology | Investing & Options

🎯 Strike Price Deep Dive

The strike price (also called the exercise price) is the price at which the option holder can buy (call) or sell (put) the underlying stock. It's the most important number in any options contract because it determines when the option becomes profitable.

How Strike Prices Are Set

Factor	Details
Exchanges set them	The options exchange (like CBOE) determines which strike prices are available. You can't choose any arbitrary number — you must pick from the listed strikes.
Strike intervals	Stocks under $25 typically have $2.50 intervals. Stocks $25–$200 have $5 intervals. Above $200, intervals are $10. High-volume stocks often have $1 intervals.
New strikes are added	As the stock price moves, exchanges add new strike prices to keep options available above and below the current price.

Choosing a Strike Price

Strike Selection	Premium Cost	Probability of Profit	Potential Return
Deep in-the-money	Expensive (lots of intrinsic value)	High — already profitable	Lower percentage returns (big capital outlay)
At-the-money	Moderate	~50% — a coin flip	Moderate returns for moderate cost
Out-of-the-money	Cheap (all extrinsic value)	Low — stock must move significantly	Highest percentage returns if it works, but most expire worthless

💡 The Strike Price Tradeoff

There's always a tradeoff between cost and probability. Cheap, far out-of-the-money options are tempting — "It only costs $0.50!" — but they have a very low chance of being profitable. More expensive, closer-to-the-money options cost more but have a much higher probability of paying off. Think of strike selection like choosing a seat at a concert: front-row seats cost more but you're guaranteed a great view; nosebleed seats are cheap but you might not see much.

💲 Premium: What You're Really Paying For

The premium is the price of the options contract — what the buyer pays and the seller receives. But the premium isn't an arbitrary number. It's made up of two distinct components, and understanding them is key to evaluating whether an option is fairly priced.

Component	What It Is	What Drives It
Intrinsic Value	The "real" value — how much the option is worth if exercised right now. For a call: stock price − strike price (if positive). For a put: strike price − stock price (if positive).	Purely the relationship between the stock price and the strike price. If the option is out-of-the-money, intrinsic value = $0.
Extrinsic Value (Time Value)	The "hope" value — the premium above intrinsic value that reflects the possibility of the option becoming more valuable before expiration.	Time remaining until expiration, implied volatility, and interest rates. More time + higher volatility = more extrinsic value.

📊 Premium Breakdown Example

Stock price: $105 | Call strike: $100 | Call premium: $8.00

Intrinsic value: $105 − $100 = $5.00 (the option is $5 in-the-money)

Extrinsic value: $8.00 − $5.00 = $3.00 (this is what you're paying for time and possibility)

At expiration, extrinsic value goes to zero. The option will be worth only its intrinsic value. This is why options lose value over time — the extrinsic portion is constantly shrinking.

What Makes Premiums Go Up or Down?

Factor	Higher Premium When…	Lower Premium When…
Stock price moves toward strike	Calls increase as stock rises; puts increase as stock falls	Calls decrease as stock falls; puts decrease as stock rises
Time to expiration	More time = higher premium (more opportunity for the stock to move)	Less time = lower premium (time decay accelerates near expiration)
Implied volatility	Higher IV = higher premium (market expects bigger moves)	Lower IV = lower premium (market expects smaller moves)
Interest rates	Calls slightly increase; puts slightly decrease with higher rates	Minor effect — usually negligible for most traders

📅 Expiration Dates & Cycles

Every option has an expiration date — the last day the option can be exercised or traded. After this date, the contract ceases to exist. Understanding expiration cycles helps you choose the right time frame for your trades.

Expiration Type	How Often	Typical Use
Weekly (Weeklys)	Expire every Friday	Short-term trades, earnings plays, quick directional bets. High time decay — options lose value very rapidly.
Monthly (Standard)	Third Friday of each month	The most commonly traded. Good balance of time and cost. This is what most beginners should use.
Quarterly	End of each calendar quarter	Used mainly by institutional investors for portfolio hedging.
LEAPS (Long-Term)	1–3 years out	Long-term investment strategies. Lower time decay. We'll cover these in Lesson 20.

Key Expiration Rules

Rule	Details
Options stop trading at market close on expiration day	For standard equity options, trading ends at 4:00 PM ET on the expiration Friday. After that, you can no longer sell to close.
In-the-money options are auto-exercised	If your option is ITM by $0.01 or more at expiration, your broker will automatically exercise it (unless you instruct otherwise). This means you'll buy or sell 100 shares.
Out-of-the-money options expire worthless	If your option is OTM at expiration, it simply disappears. No action needed — you just lose the premium you paid.
You can close early	You don't have to hold until expiration. Most traders close their positions before expiration day — either to take profits or to cut losses.

⚠️ Expiration Week Is Dangerous for Beginners

In the final week before expiration, time decay accelerates dramatically and option prices can swing wildly. This is called "gamma risk" (more on that below). Beginners should generally avoid holding options into expiration week. Consider closing positions with 1–2 weeks remaining, or use monthly/longer-dated options to give your thesis time to play out.

💎 Moneyness: ITM, ATM, OTM

Moneyness describes the relationship between the stock's current price and the option's strike price. It tells you whether the option has intrinsic value right now.

For Call Options

Status	Condition	Example (Strike = $100)	Intrinsic Value
In-the-Money (ITM)	Stock price > strike price	Stock at $110 → call is $10 ITM	$10 (would profit if exercised now)
At-the-Money (ATM)	Stock price ≈ strike price	Stock at $100 → call is ATM	$0 (right at the break point)
Out-of-the-Money (OTM)	Stock price < strike price	Stock at $90 → call is $10 OTM	$0 (would not be exercised)

For Put Options (It's Reversed)

Status	Condition	Example (Strike = $100)	Intrinsic Value
In-the-Money (ITM)	Stock price < strike price	Stock at $90 → put is $10 ITM	$10 (would profit if exercised now)
At-the-Money (ATM)	Stock price ≈ strike price	Stock at $100 → put is ATM	$0
Out-of-the-Money (OTM)	Stock price > strike price	Stock at $110 → put is $10 OTM	$0 (would not be exercised)

graph LR A["📉 Deep OTM
Low premium
Low probability"] --> B["⬅️ OTM
No intrinsic value
All extrinsic"] B --> C["🎯 ATM
Strike ≈ Stock Price
Highest extrinsic value"] C --> D["➡️ ITM
Has intrinsic value
+ some extrinsic"] D --> E["📈 Deep ITM
Mostly intrinsic
Moves like stock"] style A fill:#ef4444,stroke:#dc2626,color:#fff style C fill:#f59e0b,stroke:#d97706,color:#fff style E fill:#10b981,stroke:#059669,color:#fff

💡 Why ATM Options Have the Highest Extrinsic Value

At-the-money options have the most uncertainty — the stock could easily go either way. That uncertainty is valuable, so the market prices it in as extrinsic (time) value. Deep ITM options are almost certain to stay ITM, and deep OTM options are almost certain to stay OTM — less uncertainty means less extrinsic value.

📊 Open Interest & Volume

When evaluating an option, you need to know how liquid it is — can you easily buy and sell it without getting a bad price? Two metrics tell you this.

Metric	What It Measures	What to Look For
Volume	The number of contracts traded today. Resets to zero each day.	Higher volume = more active trading = tighter bid/ask spreads. You'll get better fill prices.
Open Interest (OI)	The total number of outstanding contracts that are currently open (not yet closed or exercised). Updated once per day.	Higher OI = more liquidity and market participant interest. Look for OI of at least a few hundred for most trades.

Why Liquidity Matters

Liquid Option	Illiquid Option
Bid: $4.90 / Ask: $5.10 (spread: $0.20)	Bid: $4.00 / Ask: $6.00 (spread: $2.00)
You pay near fair value	You overpay to get in and underpay to get out
Easy to exit the trade quickly	May be stuck if no one wants to buy your contract

⚠️ Avoid Illiquid Options

As a rule of thumb, stick to options with open interest above 100 and a bid-ask spread under $0.50. The tightest spreads are found in heavily-traded underlyings (SPY, AAPL, QQQ, TSLA) at near-the-money strikes with monthly expirations. Illiquid options are one of the hidden costs that silently eat into returns.

🏛️ The Greeks: Why They Matter

The Greeks are a set of measurements that tell you how sensitive an option's price is to various factors. They're called "Greeks" because they use Greek letters as their names. Understanding the Greeks transforms you from someone who guesses about options to someone who understands them.

Greek	Symbol	Measures Sensitivity To…	The Question It Answers
Delta	Δ	Stock price movement	"How much will my option price change if the stock moves $1?"
Gamma	Γ	Rate of delta change	"How quickly is delta changing as the stock moves?"
Theta	Θ	Time passing	"How much value does my option lose each day just from time passing?"
Vega	ν	Implied volatility changes	"How much will my option price change if implied volatility shifts by 1%?"

📊 You Don't Need to Calculate Them

Every brokerage platform calculates the Greeks for you automatically. You'll see them displayed next to each option in the options chain. Your job is to understand what they mean and use them to make better decisions — not to do the math yourself. Think of them as the "dashboard gauges" of your options position.

📐 Delta (Δ) — Directional Sensitivity

Delta measures how much the option's price will change for every $1 move in the underlying stock. It's the most important Greek for beginners because it tells you the directional exposure of your option.

Delta Values

Option Type	Delta Range	Meaning
Calls	0 to +1.0	Always positive. Call prices rise when the stock rises.
Puts	0 to −1.0	Always negative. Put prices rise when the stock falls.

Delta by Moneyness

Moneyness	Call Delta	Put Delta	Interpretation
Deep ITM	~0.90 to 1.0	~−0.90 to −1.0	Moves almost dollar-for-dollar with the stock. Behaves like owning (or shorting) 100 shares.
ATM	~0.50	~−0.50	Moves about $0.50 for every $1 stock move. Also roughly a 50% probability of expiring ITM.
Deep OTM	~0.05 to 0.20	~−0.05 to −0.20	Barely moves with the stock. Low probability of becoming profitable.

Delta as Probability

💡 Delta ≈ Probability of Expiring ITM

A call with a delta of 0.30 has roughly a 30% chance of expiring in-the-money. A call with a delta of 0.70 has roughly a 70% chance. This isn't a perfect probability, but it's a useful approximation that helps you gauge how likely your trade is to work out. It's one of the most practical uses of delta for everyday decision-making.

Delta Example

Scenario	Details
Your position	You own 1 call option with a delta of 0.60, currently worth $5.00
Stock moves up $2	Option gains approximately 0.60 × $2 = $1.20. New value ≈ $6.20
Stock moves down $3	Option loses approximately 0.60 × $3 = $1.80. New value ≈ $3.20

📊 Position Delta = Total Directional Exposure

If you own 3 call contracts with delta 0.50, your position delta is 0.50 × 3 × 100 = 150 shares of equivalent exposure. This means your position will behave roughly like owning 150 shares of stock. Position delta helps you understand the total risk of your portfolio, especially when you hold multiple options.

⚡ Gamma (Γ) — Rate of Delta Change

Gamma measures how much delta itself changes when the stock moves $1. If delta is the speed of your option's price change, gamma is the acceleration. It tells you how quickly your directional exposure is shifting.

Property	Details
Range	Always positive for both calls and puts (when you're the buyer).
Highest	At-the-money options near expiration have the highest gamma. Small stock moves cause big delta swings.
Lowest	Deep ITM and deep OTM options have low gamma. Their deltas are already near their extremes and don't change much.

Gamma Example

Step	Value
Call option delta	0.50
Gamma	0.05
Stock moves up $1	New delta = 0.50 + 0.05 = 0.55
Stock moves up another $1	New delta ≈ 0.55 + 0.05 = 0.60

Notice what's happening: as the stock moves in your favor, your delta increases. You're gaining more directional exposure as the trade works — gamma acts like an accelerant. This is great when you're right, but it works against you just as fast when you're wrong.

⚠️ Gamma Risk Near Expiration

In the final days before expiration, gamma for ATM options spikes dramatically. A stock that's right at your strike price can swing your option's value wildly with even small moves. A $1 move might flip your option from worthless to profitable (or vice versa) in minutes. This is why expiration week is the most dangerous time to hold ATM options, especially for beginners.

⏳ Theta (Θ) — Time Decay

Theta measures how much value an option loses each day purely from the passage of time — with all else held equal. It's expressed as a negative number for option buyers because time decay works against them.

How Theta Works

Property	Details
For buyers	Theta is your enemy. Your option loses value every day, even on weekends and holidays. You're paying rent on time.
For sellers	Theta is your friend. You collect premium, and time decay works in your favor — the option you sold becomes cheaper to buy back.
Acceleration	Time decay is not linear. It accelerates as expiration approaches — especially in the last 30 days. An option loses more value per day in its final week than in its first month.

Theta Example

Scenario	Details
Your position	You own a call option worth $4.00 with theta of −0.08
After 1 day (stock unchanged)	Option value ≈ $4.00 − $0.08 = $3.92
After 5 days (stock unchanged)	Option value ≈ $4.00 − ($0.08 × 5) = $3.60
Cost per contract per day	$0.08 × 100 shares = $8/day in time decay

graph LR A["📅 90+ Days Out
Slow decay
θ is small"] --> B["📅 60 Days
Moderate decay
θ increasing"] B --> C["📅 30 Days
Decay accelerates
⚠️ Danger zone"] C --> D["📅 7 Days
Rapid decay
θ is large"] D --> E["📅 Expiration
All extrinsic
value = $0"] style A fill:#10b981,stroke:#059669,color:#fff style B fill:#f59e0b,stroke:#d97706,color:#fff style C fill:#ef4444,stroke:#dc2626,color:#fff style D fill:#ef4444,stroke:#dc2626,color:#fff style E fill:#991b1b,stroke:#7f1d1d,color:#fff

💡 The 30-Day Rule for Buyers

Most experienced options buyers avoid holding positions with fewer than 30 days to expiration (unless they have a very specific short-term thesis). The "sweet spot" for buying options is typically 45–60 days to expiration — enough time for the trade to work without hemorrhaging value to time decay every day. If your trade hasn't worked with 30 days left, consider closing it rather than fighting accelerating theta.

🌊 Vega (ν) — Volatility Sensitivity

Vega measures how much the option's price changes when implied volatility (IV) moves by 1 percentage point. Technically, "vega" isn't even a Greek letter — but it's universally used in options trading.

Implied Volatility Recap

Concept	Details
Implied Volatility (IV)	The market's forecast of how much the stock price will move in the future. Higher IV = market expects bigger moves. IV is embedded in the option's premium.
IV goes up before events	Earnings announcements, FDA decisions, elections — anything uncertain causes IV to spike, making all options more expensive.
IV drops after events	Once the uncertain event passes, IV collapses — this is called IV crush. Options lose value rapidly even if the stock moves in your direction.

How Vega Works

Position	Vega Exposure	Effect
Option buyers (long)	Positive vega	You benefit when IV rises (your option becomes more valuable) and lose when IV falls.
Option sellers (short)	Negative vega	You benefit when IV falls (the option you sold becomes cheaper to buy back) and lose when IV rises.

Vega Example

Scenario	Details
Your position	Call option worth $5.00 with vega of 0.15. Current IV = 30%.
IV rises to 35%	Option gains 0.15 × 5 = $0.75. New value ≈ $5.75 (even if the stock didn't move).
IV drops to 25%	Option loses 0.15 × 5 = $0.75. New value ≈ $4.25 (even if the stock didn't move).

⚠️ IV Crush: The Silent Option Killer

Many beginners buy calls before an earnings announcement expecting a big move. The stock jumps 5% — but their option still loses money. How? Because IV was sky-high before earnings (premiums were inflated) and collapsed afterward. The 5% stock move wasn't enough to overcome the IV crush. Rule of thumb: if you're buying options before a known event, you're paying "event premium." The stock has to move more than the market already expects for you to profit.

🧩 The Greeks Working Together

In practice, all four Greeks act on your option simultaneously. Here's a scenario that shows how they interact:

📊 Full Scenario: You Buy 1 Call Option

Stock: XYZ at $100 | Strike: $100 (ATM) | Premium: $5.00 | Expiration: 45 days

Greeks: Delta = 0.50 | Gamma = 0.04 | Theta = −0.07 | Vega = 0.12

What Happens Over One Day If…

What Changes	Effect on Option Price	Greek Responsible
Stock rises $2	+$1.00 (delta × $2 = 0.50 × $2)	Delta
Delta increases because stock moved up	New delta ≈ 0.58 (0.50 + 0.04 × $2)	Gamma
One day passes	−$0.07	Theta
IV drops 2% (from 30% to 28%)	−$0.24 (0.12 × 2)	Vega
Net change	+$1.00 − $0.07 − $0.24 = +$0.69	All four

Even though the stock went up $2, your option only gained $0.69 because time decay and falling IV worked against you. This is why understanding the Greeks is essential — the stock moving in your direction is not always enough to profit.

graph TD A["📊 Option Price
Changes Due To..."] --> B["📐 DELTA
Stock moves $1
Option changes by Δ"] A --> C["⚡ GAMMA
As stock moves
Delta itself changes"] A --> D["⏳ THETA
Each day that passes
Option loses θ"] A --> E["🌊 VEGA
IV changes 1%
Option changes by ν"] B --> F["Buyers want: big moves ↑↓
in your direction"] D --> G["Buyers: enemy 👎
Sellers: friend 👍"] E --> H["Buyers: want IV to rise
Sellers: want IV to fall"] style A fill:#10b981,stroke:#059669,color:#fff

💡 Greek Priority for Beginners

When starting out, focus on delta and theta. Delta tells you your directional exposure — how much you make or lose per dollar of stock movement. Theta tells you the daily cost of holding the position. Together, they answer the two most important questions: "Am I pointed in the right direction?" and "How much is this costing me every day?" Gamma and vega become more important as you trade larger positions and more complex strategies.

🎯 Key Takeaways

Concept	What to Remember
Strike price	The exercise price. Closer strikes cost more but are more likely to profit. Farther strikes are cheap but rarely pay off.
Premium	Made of intrinsic value (real) + extrinsic value (time/hope). At expiration, only intrinsic value remains.
Expiration	Monthly (3rd Friday) is best for beginners. Time decay accelerates in the final 30 days. Consider closing before expiration week.
Moneyness	ITM = has intrinsic value. ATM = strike ≈ stock price (highest time value). OTM = no intrinsic value, only hope.
Delta (Δ)	$ change per $1 stock move. Also ≈ probability of expiring ITM. Calls: 0 to +1. Puts: 0 to −1.
Gamma (Γ)	Rate of delta change. Highest for ATM options near expiration. Creates accelerating gains (or losses).
Theta (Θ)	Daily time decay cost. Negative for buyers, positive for sellers. Accelerates in last 30 days. The 45–60 DTE sweet spot.
Vega (ν)	Sensitivity to IV changes. Buyers want IV to rise; sellers want it to fall. Beware IV crush after events.

📝 Knowledge Check

Test your understanding of options terminology and the Greeks.

Question 1: An option's premium is $7.00, with $4.00 of intrinsic value. What is the extrinsic (time) value?

$7.00 $3.00 $4.00 $11.00

Question 2: A put option has a strike price of $80. The stock is at $75. The put is:

Out-of-the-money At-the-money In-the-money Expired

Question 3: A call option has a delta of 0.65. If the stock goes up $3, approximately how much does the option gain?

$1.95 $3.00 $0.65 $6.50

Question 4: Theta is most harmful to option buyers when:

The stock is rising quickly Implied volatility is increasing There are 90+ days to expiration There are fewer than 30 days to expiration

Question 5: You buy a call before earnings. The stock jumps 4% but your option loses value. What most likely happened?

Delta was too low IV crush — implied volatility collapsed after earnings, destroying extrinsic value Gamma reversed direction The option was exercised early

⚠️ Important Disclaimer

📋 In This Lesson